I. Data Set Descriptors A. Title: Christopher B. Craft. 2018. Continuous surface groundwater well temperature, salinity and water level measurements at the GCE-LTER Seawater Addition Long-Term Experiment (SALTEx) site from February 2016 to February 2018. Georgia Coastal Ecosystems LTER Data Catalog (data set GND-GCED-1802; http://gce-lter.marsci.uga.edu/data/GND-GCED-1802) B. Accession Number: GND-GCED-1802 C. Description 1. Originator(s): Name: Christopher B. Craft Address: Indiana University - School of Public and Environmental Affairs Room 408. MSB II. Bloomington, Indiana 47405 Country: USA Email: ccraft@indiana.edu 2. Abstract: The Georgia Coastal Ecosystems LTER Seawater Addition Long-Term Experiment (SALTEx) is a large-scale field experiment designed to simulate saltwater intrusion in a tidal freshwater wetland to predict how chronic (Press) and acute (Pulse) salinization will affect this and other tidal freshwater ecosystems. In order to characterize groundwater salinity, temperature, and plot flooding following experimental manipulation, unvented water pressure, temperature and conductivity were continuously measured in a PVC groundwater well installed at the SALTEx site. Measurements were made at the bottom of the well using a submerged Schlumberger CTD-Diver logger every 15 minutes from 30-May-2014 to 14-Feb-2018. In February 2016 a second CTD-Diver was deployed near the top of the well. Data were downloaded from the loggers using Diver Office communication software, then imported into MATLAB for post-processing, quality control and documentation. Raw, unvented pressure readings were corrected for atmospheric pressure and sensor height from the bottom of the well to generate corrected pressure readings, then water level, salinity and density were calculated from the measured variables using UNESCO algorithms. These data were collected as part of the Georgia Coastal Ecosystems LTER SALTEx project (http://gce-lter.marsci.uga.edu/public/app/send_project_eml.asp?id=73), and will be updated annually. 3. Study Type: Directed Study 4. Study Themes: Groundwater Hydrology, Hydrography/Hydrology 5. LTER Core Areas: Disturbance Patterns 6. Georeferences: geographic coordinates as data columns 7. Submission Date: Mar 01, 2018 D. Keywords: Disturbance Patterns, droughts, estuaries, floods, GCE, Georgia, Georgia Coastal Ecosystems, groundwater, hydrology, LTER, pressure, salinity, Sapelo Island, temperature, USA, water level, water table II. Research Origin Descriptors A. Overall Project Description 1. Project Title: Georgia Coastal Ecosystems LTER Project III 2. Principal Investigators: Name: Merryl Alber Address: Dept. of Marine Sciences University of Georgia Athens, Georgia 30602-3636 Country: USA Email: malber@uga.edu 3. Funding Period: Nov 01, 2012 to Nov 01, 2018 4. Objectives: The research proposed for GCE-III is designed to address how variations in salinity and inundation, driven by climate change and anthropogenic factors, affect biotic and ecosystem responses at different spatial and temporal scales, and to predict the consequences of these changes for habitat provisioning and carbon (C) sequestration across the coastal landscape. 5. Abstract: The Georgia Coastal Ecosystems (GCE) LTER is located along three adjacent sounds on the Atlantic coast and includes both intertidal marshes and estuaries. Long-term drivers of climate change, sea level rise and human alterations of the landscape will cause transitions in dominant habitat types (state changes) within the GCE domain by changing the amounts and patterns of water delivery across the landscape. These changes in water delivery can be conceptualized as presses and pulses in river inflow, local runoff, groundwater input, and tidal inundation, which will in turn manifest themselves as changes in salinity and inundation patterns in the domain. The research proposed for GCE-III is designed to address how variations in salinity and inundation, driven by climate change and anthropogenic factors, affect biotic and ecosystem responses at different spatial and temporal scales, and to predict the consequences of these changes for habitat provisioning and carbon (C) sequestration across the coastal landscape. The goals are to: 1) Track long-term changes in climate and human actions in the watershed and adjacent uplands, and evaluate the effects of these drivers on domain boundary conditions. 2) Describe temporal and spatial variability in physical, chemical, geological and biological, and to evaluate how they are affected by variations in river inflow and other boundary conditions. 3) Characterize the responses of three dominant habitats in the domain to pulses and presses in salinity and inundation. 4) Describe patterns of habitat provisioning and C sequestration and export in the GCE domain, and to evaluate how these might be affected by changes in salinity and inundation. These efforts will be synthesized into a synoptic understanding of both biotic and ecosystem responses to variations in salinity and inundation driven by climate change and human activities, which will be used to assess thresholds between habitats and the potential for state changes in the domain. 6. Funding Source: NSF OCE 1237140 B. Sub-project Description 1. Site Description a. Geographic Location: SALTEx -- SALTEx Research Site, Champney Island, Georgia, USA SALTEx_Well1 -- SALTEx Groundwater Well 1 Coordinates: SALTEx -- NW: 081 28 01.91 W, 31 20 23.40 N NE: 081 27 58.28 W, 31 20 23.40 N SE: 081 27 58.28 W, 31 20 20.23 N SW: 081 28 01.91 W, 31 20 20.23 N SALTEx_Well1 -- 81 27 59.9 W, 31 20 22.0 N b. Physiographic Region: SALTEx -- unspecified SALTEx_Well1 -- unspecified c. Landform Components: SALTEx -- unspecified SALTEx_Well1 -- unspecified d. Hydrographic Characteristics: SALTEx -- unspecified SALTEx_Well1 -- unspecified e. Topographic Attributes: SALTEx -- unspecified SALTEx_Well1 -- unspecified f. Geology, Lithology and Soils: SALTEx -- unspecified SALTEx_Well1 -- unspecified g. Vegetation Communities: SALTEx -- Zizaniopsis, Spartina cynosuroides SALTEx_Well1 -- Zizaniopsis, Spartina cynosuroides h. History of Land Use and Disturbance: none recorded i. Climate: Climate summary for Sapelo Island, Georgia, based on NWS data from 1980-2010: Daily-aggregated Values: Mean (sample standard deviation) mean air temperature: 20.09°C (7.28°C) minimum air temperature: 15.02°C (7.96°C) maximum air temperature: 24.82°C (6.98°C) total precipitation: 3.26mm (10.3mm) Yearly-aggregated Daily Values: Mean (sample standard deviation) total precipitation (1980-2010): 1124mm (266mm) 2. Experimental or Sampling Design a. Design Characteristics: Groundwater pressure, temperature and conductivity were measured continously in a fixed-position groundwater well to characterize changes in water table, water chemistry and groundwater flow at the SALTEx research site near Champeny Island, Georgia. b. Permanent Plots: none c. Data Collection Duration and Frequency: Groundwater well water pressure, temperature and conductivity measurements were recorded every 15 minutes by autonomous data loggers installed in a PVC well. The well was also pumped every 14 days using a peristalsis pump to retrieve water samples for anysis to mainain well permeability. Beginning of Observations: May 30, 2014 End of Observations: Feb 14, 2018 3. Research Methods a. Field and Laboratory Methods: Method 1: Well Installation -- A single PVC groundwater well was installed adjacent to the SALTEx treatment plots. The well was placed in sand layers in order to prevent clogging and to allow sampling of a continuously connected groundwater source. The well was sunk to 1.24m depth, with a 1.87m riser above the sediment surface to prevent surface water contamination. Method 2: Data Logger Installation -- A Schlumberger CTD-Diver data logger was suspended by a nylon tether from the top of the PVC well riser to a height just above the bottom of the well, at a final depth of 1.16m below ground level in May 2014. In February 2016 a second CTD-Diver was added, suspended in the well to a depth of 0.58m below ground level. Both loggers were programmed to log unvented water pressure, temperature and conductivity at 15 minute intervals. Method 3: Well Pumping -- Every two weeks, a peristalsic pump was used to remove excessive water from the well for 15-20 minutes. During the process, a sample of well water was measured for salinity and conductivity using a YSI multiparameter handheld instrument for comparison. Method 4: Data Download -- Every two months, the data loggers were downloaded using a Dell Latitude E6420 XFR Toughbook laptop computer and Diver Office Software. During the process, the well was pumped for 15-20 minutes and a sample of well water was measured for salinity and conductivity using a YSI multiparameter handheld instrument. Method 5: Data Post-Processing -- Text files generated by Diver Office Software were parsed and imported into the GCE Data Toolbox for MATLAB software for post processing. The raw data files were documented using metadata templates, and columns for well location name, latitude, longitude and sensor elevation were added. The data sets were then integrated with barometric pressure data sets from the GCE-LTER Marsh Landing weather station on Sapelo Island, Georgia, to correct unvented water pressure readings for atmospheric pressure. Corrected depth and water level were then calculated from the corrected pressure readings, and salinity and density were calculated from corrected pressure, temperature and conductivity using UNESCO algorithms. Complete data sets were then quality-controlled using automated QA/QC rules and visual inspection. Method 6: Quality Control -- Quality control was performed using the GCE Data Toolbox fo MATLAB software. Q/C rules were defined to assign flags to values outside of sensor range or outside of suitable deployment conditions (e.g. out of water measurements based on pressure). Flags were also automatically assigned to data values recorded during and through approximately 9 hours after pumping events (i.e. during the re-equilibration period) using the 'flag_well_pumping.m' function in the toolbox. b. Protocols: Method 1: none Method 2: none Method 3: none Method 4: none Method 5: none Method 6: none c. Instrumentation: Method 1: none Method 2: Schlumberger CTD-Diver Manufacturer: Schlumberger (Model: CTD-Diver) Parameter: Conductivity (Accuracy: 1%, Range: 0.01-120 mS/cm) Parameter: Pressure (Accuracy: 0.5 cm, Range: 0-10 m H2O) Parameter: Temperature (Accuracy: 0.10 ºC, Range: 0 to 50 ºC) Method 3: YSI Handheld Conductivity Probe Manufacturer: YSI Instruments (Model: 30) Parameter: Conductivity (Accuracy: 1.0 uS/cm, Readability: 0.0001 to 0.1 mS/cm, Range: 0 to 200 mS/cm) Parameter: Salnity (Accuracy: 0.1 PSU, Readability: 0.01 PSU, Range: 0 to 70 PSU) Parameter: Temperature (Accuracy: 0.2°C, Readability: 0.1°C, Range: -5 to 55°C) Method 4: YSI Handheld Conductivity Probe Manufacturer: YSI Instruments (Model: 30) Parameter: Conductivity (Accuracy: 1.0 uS/cm, Readability: 0.0001 to 0.1 mS/cm, Range: 0 to 200 mS/cm) Parameter: Salnity (Accuracy: 0.1 PSU, Readability: 0.01 PSU, Range: 0 to 70 PSU) Parameter: Temperature (Accuracy: 0.2°C, Readability: 0.1°C, Range: -5 to 55°C) Method 5: none Method 6: none d. Taxonomy and Systematics: Method 1: not applicable Method 2: not applicable Method 3: not applicable Method 4: not applicable Method 5: not applicable Method 6: not applicable e. Speclies List: f. Permit History: Method 1: not applicable Method 2: not applicable Method 3: not applicable Method 4: not applicable Method 5: not applicable Method 6: not applicable 4. Project Personnel a. Personnel: 1: Christopher B. Craft 2: Dontrece Smith 3: Sarah Widney 4: Wade M. Sheldon, Jr. b. Affiliations: 1: Indiana University at Bloomington, Bloomington, Indiana 2: University of Georgia Marine Institute, Sapelo Island, Georgia 3: Indiana University, Bloomington, Indiana 4: University of Georgia, Athens, Georgia III. Data Set Status and Accessibility A. Status 1. Latest Update: 08-Mar-2018 2. Latest Archive Date: 08-Mar-2018 3. Latest Metadata Update: 08-Mar-2018 4. Data Verification Status: New Submission B. Accessibility 1. Storage Location and Medium: Stored at GCE-LTER Data Management Office Dept. of Marine Sciences Univ. of Georgia Athens, GA 30602-3636 USA on media: electronic data download (WWW) or compact disk 2. Contact Person: Name: Wade M. Sheldon, Jr. Address: Dept. of Marine Sciences University of Georgia Athens, Georgia 30602-3636 Country: USA Email: sheldon@uga.edu 3. Copyright Restrictions: not copyrighted 4. Restrictions: This information is licensed under a Creative Commons Attribution 4.0 International License (see: https://creativecommons.org/licenses/by/4.0/). The consumer of these data ("Data User" herein) has an ethical obligation to cite it appropriately in any publication that results from its use. The Data User should realize that these data may be actively used by others for ongoing research and that coordination may be necessary to prevent duplicate publication. The Data User is urged to contact the authors of these data if any questions about methodology or results occur. Where appropriate, the Data User is encouraged to consider collaboration or co-authorship with the authors. The Data User should realize that misinterpretation of data may occur if used out of context of the original study. While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is." The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data. a. Release Date: Affiliates: Mar 01, 2018, Public: Mar 01, 2019 b. Citation: Data provided by the Georgia Coastal Ecosystems Long Term Ecological Research Project, supported by funds from NSF OCE 1237140 (data set GND-GCED-1802) c. Disclaimer: The user assumes all responsibility for errors in judgement based on interpretation of data and analyses presented in this data set. 5. Costs: free electronic data download via WWW, distribution on CD may be subject to nominal processing and handling fee IV. Data Structural Descriptors A. Data Set File 1. File Name: GND-GCED-1802_Surface_1_0.CSV 2. Size: 71340 records 3. File Format: ASCII text (comma-separated value format) 3a. Delimiters: single comma 4. Header Information: 5 lines of ASCII text 5. Alphanumeric Attributes: upper case 6. Quality Control Flag Codes: I = invalid value, Q = questionable value, X = excise record flag (data collected under unsuitable conditions), E = estimated value based on interpolation, P = value recorded during or following well pumping event 7. Authentication Procedures: not specified 8. Calculations: Pressure: Pressure(Pa) = Pressure(cm H2O) * 98.0665 Pressure_Corrected: Pressure_Corrected = Pressure - Pressure_Atm Depth: Depth = pressure2depth(Pressure_Corrected,Latitude,'Pa') Salinity: Salinity = cond2salinity(Depth,Temp_Water,Conductivity) Water_Level: Water_Level = Sensor_Elevation + Depth_Corrected 9. Processing History: Software version: GCE Data Toolbox Version 3.9.7b (17-Jul-2017) Data structure version: GCE Data Structure 1.1 (29-Mar-2001) Original data files processed: SC_SALTEx_Well1a_J7691_20160202-20160720_filtered.CSV (16237 records) SC_SALTEx_Well1a_J7691_20160731-20170330_filtered.CSV (23260 records) SC_SALTEx_Well1a_J7691_20170330-20170906_filtered.CSV (15353 records) SC_SALTEx_Well1a_J7691_20170906-20170916_filtered.CSV (961 records) SC_SALTEx_Well1a_J7691_20171215-20180214_filtered.CSV (15455 records) Data processing history: 26-Oct-2017: new GCE Data Structure 1.1 created ('newstruct') 26-Oct-2017: 16237 rows imported from ASCII data file 'SC_SALTEx_Well1a_J7691_20160202-20160720_filtered.CSV' ('imp_ascii') 26-Oct-2017: data descriptor metadata updated based on the template 'SALTEx_Schlumberger' ('meta_template') 26-Oct-2017: data structure validated ('gce_valid') 26-Oct-2017: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 26-Oct-2017: automatically assigned study date metadata descriptors based on the range of date values in date/time columns (add_studydates) 26-Oct-2017: updated 1 metadata fields in the Supplement sections ('addmeta') 26-Oct-2017: updated 1 metadata fields in the Dataset sections ('addmeta') 26-Oct-2017: updated 1 metadata fields in the Dataset sections ('addmeta') 26-Oct-2017: calculated calendar date in MATLAB serial day (base 1/1/0000) format from individual date component columns Year, Month, Day, Hour, Minute and Second, added 'Date' column at position 1 ('add_datecol') 26-Oct-2017: added column 'Sensor_Elevation' at position 8 ('addcol') 26-Oct-2017: Q/C flagging criteria applied for column(s) Sensor_Elevation, 'flags' field updated ('dataflag') 26-Oct-2017: added column 'Sensor' at position 8 ('addcol') 26-Oct-2017: added column 'Latitude' at position 8 ('addcol') 26-Oct-2017: Q/C flagging criteria applied for column(s) Latitude, 'flags' field updated ('dataflag') 26-Oct-2017: added column 'Longitude' at position 8 ('addcol') 26-Oct-2017: Q/C flagging criteria applied for column(s) Longitude, 'flags' field updated ('dataflag') 26-Oct-2017: added column 'Location' at position 8 ('addcol') 26-Oct-2017: added column 'Hammock' at position 8 ('addcol') 26-Oct-2017: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 26-Oct-2017: added geographic metadata based on matching values in column Location to location and station names registered in 'geo_locations.mat' ('add_sitemetadata') 26-Oct-2017: updated 8 metadata fields in the Site sections ('addmeta') 26-Oct-2017: converted units of 'Pressure' column and 2 QA/QC flag criteria parameters from cm H2O to Pa ('unit_convert') 26-Oct-2017: Q/C flagging criteria applied for column(s) Pressure, Temp_Water and Conductivity, 'flags' field updated ('dataflag') 26-Oct-2017: performed a left join of columns Year, Month, Day, Hour and Minute on columns Year, Month, Day, Hour and Minute from a second structure, returning column(s) Date, Second, Hammock, Location, Longitude, Latitude, Sensor, Sensor_Elevation, Pressure, Temp_Water and Conductivity from the first structure and column(s) Pressure_Atm from the second structure (16237 rows) ('joindata') 26-Oct-2017: updated title ('newtitle') 26-Oct-2017: updated 1 metadata fields in the Dataset sections ('addmeta') 26-Oct-2017: copied/reordered columns Date, Year, Month, Day, Hour, Minute, Second, Hammock, Location, Longitude, Latitude, Sensor, Sensor_Elevation, Pressure, Pressure_Atm, Temp_Water and Conductivity ('copycols') 26-Oct-2017: calculated column Pressure_Corrected generated by the expression 'Pressure - Pressure_Atm' (add_calcexpr) 26-Oct-2017: updated 1 metadata fields in the Data sections ('addmeta') 26-Oct-2017: copied QA/QC flags from column(s) Pressure and Pressure_Atm to column(s) Pressure_Corrected, merging copied flags with any existing flags, and set QA/QC criteria for destination column(s) to 'manual' ('copyflags') 26-Oct-2017: added column 'Depth_Corrected' at position 16 ('addcol') 26-Oct-2017: Q/C flagging criteria applied for column(s) Depth_Corrected, 'flags' field updated ('dataflag') 26-Oct-2017: copied QA/QC flags from column(s) Pressure and Pressure_Atm to column(s) Pressure_Corrected, merging copied flags with any existing flags, and set QA/QC criteria for destination column(s) to 'manual' ('copyflags') 26-Oct-2017: copied QA/QC flags from column(s) Pressure_Corrected to column(s) Depth_Corrected, merging copied flags with any existing flags, and set QA/QC criteria for destination column(s) to 'manual' ('copyflags') 26-Oct-2017: calculated column Depth generated by the expression 'pressure2depth(Pressure_Corrected,Latitude,'Pa')' (add_calcexpr) 26-Oct-2017: updated 1 metadata fields in the Data sections ('addmeta') 26-Oct-2017: copied QA/QC flags from column(s) Latitude and Pressure_Corrected to column(s) Depth, merging copied flags with any existing flags, and set QA/QC criteria for destination column(s) to 'manual' ('copyflags') 26-Oct-2017: calculated column Salinity generated by the expression 'cond2salinity(Depth,Temp_Water,Conductivity)' (add_calcexpr) 26-Oct-2017: updated 1 metadata fields in the Data sections ('addmeta') 26-Oct-2017: copied QA/QC flags from column(s) Depth, Temp_Water and Conductivity to column(s) Salinity, merging copied flags with any existing flags, and set QA/QC criteria for destination column(s) to 'manual' ('copyflags') 26-Oct-2017: copied QA/QC flags from column(s) Depth, Temp_Water and Conductivity to column(s) Salinity, merging copied flags with any existing flags, and set QA/QC criteria for destination column(s) to 'manual' ('copyflags') 26-Oct-2017: added column 'Density' at position 22 ('addcol') 26-Oct-2017: Q/C flagging criteria applied for column(s) Density, 'flags' field updated ('dataflag') 26-Oct-2017: copied QA/QC flags from column(s) Salinity and Temp_Water to column(s) Density, merging copied flags with any existing flags, and set QA/QC criteria for destination column(s) to 'manual' ('copyflags') 26-Oct-2017: calculated column Water_Level generated by the expression 'Sensor_Elevation + Depth_Corrected' (add_calcexpr) 26-Oct-2017: updated 1 metadata fields in the Data sections ('addmeta') 26-Oct-2017: copied QA/QC flags from column(s) Sensor_Elevation and Depth_Corrected to column(s) Water_Level, merging copied flags with any existing flags, and set QA/QC criteria for destination column(s) to 'manual' ('copyflags') 26-Oct-2017: copied QA/QC flags from column(s) Depth_Corrected and Sensor_Elevation to column(s) Water_Level, merging copied flags with any existing flags, and set QA/QC criteria for destination column(s) to 'manual' ('copyflags') 26-Oct-2017: 23260 rows added at the bottom of the data set ('datamerge') 26-Oct-2017: updated 51 metadata fields in the Data, Dataset, Project, Site, Status, Study, Supplement sections ('addmeta') 26-Oct-2017: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 26-Oct-2017: automatically assigned study date metadata descriptors based on the range of date values in date/time columns (add_studydates) 26-Oct-2017: 15353 rows added at the bottom of the data set ('datamerge') 26-Oct-2017: updated 51 metadata fields in the Data, Dataset, Project, Site, Status, Study, Supplement sections ('addmeta') 26-Oct-2017: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 26-Oct-2017: automatically assigned study date metadata descriptors based on the range of date values in date/time columns (add_studydates) 26-Oct-2017: 961 rows added at the bottom of the data set ('datamerge') 26-Oct-2017: updated 51 metadata fields in the Data, Dataset, Project, Site, Status, Study, Supplement sections ('addmeta') 26-Oct-2017: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 26-Oct-2017: automatically assigned study date metadata descriptors based on the range of date values in date/time columns (add_studydates) 26-Oct-2017: updated title ('newtitle') 26-Oct-2017: updated 1 metadata fields in the Dataset sections ('addmeta') 26-Oct-2017: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 26-Oct-2017: manually edited data set metadata ('ui_editmetadata') 26-Oct-2017: edited data set title in structure and metadata ('ui_editor') 26-Oct-2017: inserted 1035 new records with date/time values and NaN/null data values (replicating common values in the non-data columns Hammock, Location, Longitude, Latitude and Sensor) to fill in date/time interval gaps in the data series ('pad_date_gaps') 26-Oct-2017: sorted by column Date(ascending) ('sortdata') 26-Oct-2017: deleted existing datetime columns Year, Month, Day, Hour, Minute and Second; updated Year, Month, Day, Hour, Minute and Second datetime columns added after column Date ('add_datepartcols') 26-Oct-2017: QA/QC flags assigned by visual inspection (ui_visualqc); flags cleared on 334 records in Water_Level; flags cleared on 678 records in Salinity; flags cleared on 334 records in Depth; flags cleared on 334 records in Depth_Corrected 26-Oct-2017: documented flagged and missing values in columns Pressure, Pressure_Corrected, Depth, Depth_Corrected, Water_Level, Pressure_Atm, Temp_Water, Conductivity, Salinity and Density as data set anomalies in the metadata ('add_anomalies') 26-Oct-2017: copied QA/QC flags for column(s) Density to column(s) Pressure, Temp_Water and Salinity, overwriting any existing flags, and set QA/QC criteria for destination column(s) to 'manual' ('copyflags') 26-Oct-2017: manually edited data set metadata ('ui_editmetadata') 26-Oct-2017: documented flagged and missing values in columns Pressure, Pressure_Corrected, Depth, Depth_Corrected, Water_Level, Pressure_Atm, Temp_Water, Conductivity, Salinity and Density as data set anomalies in the metadata ('add_anomalies') 08-Mar-2018: Units of column Date changed from 'serial day (base 1/1/0000) - GMT' to 'Calendar date of observation - GMT'; Units of column Month changed from 'MM' to 'M'; Units of column Day changed from 'DD' to 'D'; Units of column Hour changed from 'hr' to 'hh'; Units of column Minute changed from 'min' to 'mm'; Units of column Second changed from 'sec' to 'ss';deleted column Location from data structure ('ui_editor') 08-Mar-2018: 14495 rows added at the bottom of the data set from 'SALTEx Well Bottom Pressure, Temperature and Conductivity Measurements from 06-Sep-2017 to 14-Feb-2018' ('datamerge') 08-Mar-2018: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 08-Mar-2018: automatically assigned study date metadata descriptors based on the range of date values in date/time columns (add_studydates) 08-Mar-2018: copied/reordered columns Date, Year, Month, Day, Hour, Minute, Second, Hammock, Location, Longitude, Latitude, Sensor, Sensor_Elevation, Pressure, Pressure_Corrected, Depth, Depth_Corrected, Water_Level, Pressure_Atm, Temp_Water, Conductivity, Salinity and Density ('copycols') 08-Mar-2018: replaced missing values in column(s) Location with values calculated from the MATLAB expression ''SALTEx_Well1'' ('calc_missing_vals') 08-Mar-2018: locked Q/C flag criteria for column Location to prevent automatic evaluation ('flag_locks') 08-Mar-2018: 56846 values in 'Location' were updated with new values ('update_data') 08-Mar-2018: Q/C flagging criteria applied for column(s) Location, 'flags' field updated ('dataflag') 08-Mar-2018: deleted column Second from data structure ('ui_editor') 08-Mar-2018: sorted by columns Date(ascending), Year(ascending), Month(ascending), Day(ascending), Hour(ascending), Minute(ascending) ('sortdata') 08-Mar-2018: removed 1 row(s) with duplicate values in the column(s) Date, Year, Month, Day, Hour and Minute ('cleardupes') 08-Mar-2018: manually edited data set metadata ('ui_editmetadata') 08-Mar-2018: documented flagged and missing values in columns Sensor_Elevation, Pressure, Pressure_Corrected, Depth, Depth_Corrected, Water_Level, Pressure_Atm, Temp_Water, Conductivity, Salinity and Density as data set anomalies in the metadata ('add_anomalies') 08-Mar-2018: updated 1 metadata fields in the Dataset sections ('addmeta') 08-Mar-2018: imported Dataset, Project, Site, Study, Status, Supplement metadata descriptors from the GCE Metabase ('imp_gcemetadata') 08-Mar-2018: updated 57 metadata fields in the Dataset, Project, Site, Status, Study, Supplement sections ('addmeta') 08-Mar-2018: manually edited data set metadata ('ui_editmetadata') 08-Mar-2018: edited data set title in structure and metadata ('ui_editor') 08-Mar-2018: updated 1 metadata fields in the Dataset sections ('addmeta') 08-Mar-2018: imported Dataset, Project, Site, Study, Status, Supplement metadata descriptors from the GCE Metabase ('imp_gcemetadata') 08-Mar-2018: updated 57 metadata fields in the Dataset, Project, Site, Status, Study, Supplement sections ('addmeta') 08-Mar-2018: manually edited data set metadata ('ui_editmetadata') 08-Mar-2018: edited data set title in structure and metadata ('ui_editor') 08-Mar-2018: converted dates in column(s) Date to format yyyy-mm-dd HH:MM:SS 08-Mar-2018: flags for columns Sensor_Elevation, Pressure, Pressure_Corrected, Depth, Depth_Corrected, Water_Level, Pressure_Atm, Temp_Water, Conductivity, Salinity and Density converted to data columns, flag codes updated in metadata ('flags2cols') 08-Mar-2018: updated 6 metadata fields in the Data sections ('addmeta') 08-Mar-2018: updated 15 metadata fields in the Status, Data sections to reflect attribute metadata ('updatecols') 08-Mar-2018: parsed and formatted metadata ('listmeta') B. Variable Information 1. Variable Name: column 1. Date column 2. Year column 3. Month column 4. Day column 5. Hour column 6. Minute column 7. Hammock column 8. Location column 9. Longitude column 10. Latitude column 11. Sensor column 12. Sensor_Elevation column 13. Flag_Sensor_Elevation column 14. Pressure column 15. Flag_Pressure column 16. Pressure_Corrected column 17. Flag_Pressure_Corrected column 18. Depth column 19. Flag_Depth column 20. Depth_Corrected column 21. Flag_Depth_Corrected column 22. Water_Level column 23. Flag_Water_Level column 24. Pressure_Atm column 25. Flag_Pressure_Atm column 26. Temp_Water column 27. Flag_Temp_Water column 28. Conductivity column 29. Flag_Conductivity column 30. Salinity column 31. Flag_Salinity column 32. Density column 33. Flag_Density 2. Variable Definition: column 1. Fractional MATLAB serial day (based on 1 = January 1, 0000) column 2. Calendar year column 3. Calendar month column 4. Calendar day column 5. Hours - GMT column 6. Minutes column 7. Hammock id where well is installed column 8. Location code of well in the GCE locations database column 9. Geographic longitude in decimal degrees column 10. Geographic latitude in decimal degrees column 11. Sensor ID (serial number) column 12. Absolute elevation of the sensor relative to NAVD88 datum, adjusted for PVC riser height and sensor deployment depth column 13. QA/QC flags for Absolute elevation of the sensor relative to NAVD88 datum, adjusted for PVC riser height and sensor deployment depth (flagging criteria, where "x" is Sensor_Elevation: flag_inlist(Location,"HN_i_1_WELL_LOC_0,HN_i_1_WELL_LOC_1,PC_i_29_WELL_LOC_0")="E") column 14. Groundwater pressure column 15. QA/QC flags for Groundwater pressure (flagging criteria, where "x" is Pressure: x<0="I", x>196133="Q", flag_well_pumping(x,[1 12],0.4)="P") column 16. Groundwater well pressure corrected for atmospheric pressure using the equation: Pressure - Pressure_Atm column 17. QA/QC flags for Groundwater well pressure corrected for atmospheric pressure using the equation: Pressure - Pressure_Atm (flagging criteria, where "x" is Pressure_Corrected: x<0="I", x>196133="Q", flag_well_pumping(x,[1 12],0.4)="P", manual) column 18. Water depth calculated from corrected water pressure and latitude using a UNESCO algorithm column 19. QA/QC flags for Water depth calculated from corrected water pressure and latitude using a UNESCO algorithm (flagging criteria, where "x" is Depth: manual) column 20. Water depth calculated from corrected well pressure and geographic latitude using UNESCO algorithms column 21. QA/QC flags for Water depth calculated from corrected well pressure and geographic latitude using UNESCO algorithms (flagging criteria, where "x" is Depth_Corrected: x<0="Q", manual) column 22. Water level relative to NAVD88 datum calculated from sensor elevation and corrected water depth above the sensor column 23. QA/QC flags for Water level relative to NAVD88 datum calculated from sensor elevation and corrected water depth above the sensor (flagging criteria, where "x" is Water_Level: manual) column 24. Barometric pressure (15 minute average) column 25. QA/QC flags for Barometric pressure (15 minute average) (flagging criteria, where "x" is Pressure_Atm: x<0="I", x>106000="I", x<96000="Q", x>105000="Q", manual) column 26. Groundwater temperature column 27. QA/QC flags for Groundwater temperature (flagging criteria, where "x" is Temp_Water: x<0="I", x<10="Q", x>40="Q", x>100="I", flag_well_pumping(Pressure,[1 36],0.5)="P") column 28. Groundwater conductivity column 29. QA/QC flags for Groundwater conductivity (flagging criteria, where "x" is Conductivity: x<0="I", flag_well_pumping(Pressure,[1 36],0.5)="P") column 30. Water salinity calculated from conductivity, temperature and depth using UNESCO algorithms column 31. QA/QC flags for Water salinity calculated from conductivity, temperature and depth using UNESCO algorithms (flagging criteria, where "x" is Salinity: manual) column 32. Groundwater density as a function of salinity, temperature and pressure, calculated from Sigma-t (i.e. specific gravity anomaly calculated using 'swstate' in the WHOI Oceans toolbox, based on UNESCO algorithms) as Density = Sigma-t + 1000 column 33. QA/QC flags for Groundwater density as a function of salinity, temperature and pressure, calculated from Sigma-t (i.e. specific gravity anomaly calculated using 'swstate' in the WHOI Oceans toolbox, based on UNESCO algorithms) as Density = Sigma-t + 1000 (flagging criteria, where "x" is Density: x<0="I", manual) 3. Units of Measurement: column 1. yyyy-mm-dd HH:MM:SS - GMT column 2. YYYY column 3. M column 4. D column 5. hh column 6. mm column 7. none column 8. none column 9. degrees column 10. degrees column 11. none column 12. m column 13. none column 14. Pa column 15. none column 16. Pa column 17. none column 18. m column 19. none column 20. m column 21. none column 22. m column 23. none column 24. Pa column 25. none column 26. °C column 27. none column 28. mS/cm column 29. none column 30. PSU column 31. none column 32. kg/m^3 column 33. none 4. Data Type a. Storage Type: column 1. string column 2. integer column 3. integer column 4. integer column 5. integer column 6. integer column 7. string column 8. string column 9. floating-point column 10. floating-point column 11. string column 12. floating-point column 13. string column 14. floating-point column 15. string column 16. floating-point column 17. string column 18. floating-point column 19. string column 20. floating-point column 21. string column 22. floating-point column 23. string column 24. floating-point column 25. string column 26. floating-point column 27. string column 28. floating-point column 29. string column 30. floating-point column 31. string column 32. floating-point column 33. string b. Variable Codes: Flag_Pressure: P = value recorded during or following well pumping event Flag_Pressure_Corrected: F = unspecified, P = value recorded during or following well pumping event Flag_Depth: F = unspecified, P = value recorded during or following well pumping event Flag_Depth_Corrected: F = unspecified, P = value recorded during or following well pumping event Flag_Water_Level: F = unspecified, P = value recorded during or following well pumping event Flag_Pressure_Atm: F = unspecified Flag_Temp_Water: P = value recorded during or following well pumping event, Q = questionable value Flag_Conductivity: P = value recorded during or following well pumping event Flag_Salinity: F = unspecified, P = value recorded during or following well pumping event, Q = questionable value Flag_Density: F = unspecified, P = value recorded during or following well pumping event, Q = questionable value c. Numeric Range: column 1. (none) column 2. 2016 to 2018 column 3. 1 to 12 column 4. 1 to 31 column 5. 0 to 23 column 6. 0 to 45 column 7. (none) column 8. (none) column 9. -81.4666 to -81.4666 column 10. 31.3394 to 31.3394 column 11. (none) column 12. 0.206 to 0.206 column 13. (none) column 14. 99145.2315 to 117581.7335 column 15. (none) column 16. -1766.037 to 17911.7335 column 17. (none) column 18. -0.17538 to 1.7788 column 19. (none) column 20. -0.17538 to 1.7788 column 21. (none) column 22. 0.030617 to 1.9848 column 23. (none) column 24. 98260 to 104050 column 25. (none) column 26. 9.36 to 38.26 column 27. (none) column 28. 0.004 to 36.956 column 29. (none) column 30. 0.0069361 to 24.4982 column 31. (none) column 32. 992.8862 to 1016.0219 column 33. (none) d. Missing Value Code: 5. Data Format a. Column Type: column 1. text column 2. numerical column 3. numerical column 4. numerical column 5. numerical column 6. numerical column 7. text column 8. text column 9. numerical column 10. numerical column 11. text column 12. numerical column 13. text column 14. numerical column 15. text column 16. numerical column 17. text column 18. numerical column 19. text column 20. numerical column 21. text column 22. numerical column 23. text column 24. numerical column 25. text column 26. numerical column 27. text column 28. numerical column 29. text column 30. numerical column 31. text column 32. numerical column 33. text b. Number of Columns: 33 c. Decimal Places: column 1. 0 column 2. 0 column 3. 0 column 4. 0 column 5. 0 column 6. 0 column 7. 0 column 8. 0 column 9. 8 column 10. 8 column 11. 0 column 12. 4 column 13. 0 column 14. 1 column 15. 0 column 16. 1 column 17. 0 column 18. 5 column 19. 0 column 20. 3 column 21. 0 column 22. 4 column 23. 0 column 24. 1 column 25. 0 column 26. 2 column 27. 0 column 28. 2 column 29. 0 column 30. 5 column 31. 0 column 32. 5 column 33. 0 6. Logical Variable Type: column 1. datetime (none) column 2. datetime (discrete) column 3. datetime (discrete) column 4. datetime (discrete) column 5. datetime (discrete) column 6. datetime (discrete) column 7. nominal (none) column 8. nominal (none) column 9. geographic coordinate (continuous) column 10. geographic coordinate (continuous) column 11. nominal (none) column 12. calculation (continuous) column 13. coded value (none) column 14. data (continuous) column 15. coded value (none) column 16. calculation (continuous) column 17. coded value (none) column 18. calculation (continuous) column 19. coded value (none) column 20. calculation (continuous) column 21. coded value (none) column 22. calculation (continuous) column 23. coded value (none) column 24. data (continuous) column 25. coded value (none) column 26. data (continuous) column 27. coded value (none) column 28. data (continuous) column 29. coded value (none) column 30. calculation (continuous) column 31. coded value (none) column 32. calculation (continuous) column 33. coded value (none) 7. Flagging Criteria: column 1. none column 2. none column 3. x<1="I";x>12="I" column 4. x<1="I";x>31="I" column 5. x<0="I";x>24="I" column 6. x<0="I";x>60="I" column 7. none column 8. manually-assigned flags column 9. x<-180="I";x>180="I" column 10. x<-90="I";x>90="I" column 11. none column 12. flag_inlist(col_Location,"HN_i_1_WELL_LOC_0,HN_i_1_WELL_LOC_1,PC_i_29_WELL_LOC_0")="E" column 13. none column 14. x<0="I";x>196133="Q";flag_well_pumping(x,[1 12],0.4)="P" column 15. none column 16. x<0="I";x>196133="Q";flag_well_pumping(x,[1 12],0.4)="P";manually-assigned flags column 17. none column 18. manually-assigned flags column 19. none column 20. x<0="Q";manually-assigned flags column 21. none column 22. manually-assigned flags column 23. none column 24. x<0="I";x>106000="I";x<96000="Q";x>105000="Q";manually-assigned flags column 25. none column 26. x<0="I";x<10="Q";x>40="Q";x>100="I";flag_well_pumping(col_Pressure,[1 36],0.5)="P" column 27. none column 28. x<0="I";flag_well_pumping(col_Pressure,[1 36],0.5)="P" column 29. none column 30. manually-assigned flags column 31. none column 32. x<0="I";manually-assigned flags column 33. none C. Data Anomalies: Values of 1035 records in Sensor_Elevation are missing for dates: 07/20/2016-07/31/2016, 03/30/2017, 09/06/2017. Values of 433 records in Pressure were flagged as P (value recorded during or following well pumping event) for dates: 02/15/2016, 02/28/2016-02/29/2016, 03/22/2016, 03/24/2016-03/25/2016, 04/13/2016, 04/27/2016, 05/23/2016, 05/26/2016, 06/05/2016, 06/14/2016, 07/15/2016, 07/20/2016, 08/23/2016, 09/13/2016, 09/28/2016, 10/14/2016, 11/01/2016, 11/17/2016-11/18/2016, 12/07/2016, 01/11/2017, 01/19/2017, 02/16/2017, 03/08/2017, 04/23/2017-04/24/2017, 06/01/2017, 08/04/2017, 09/06/2017, 10/24/2017, 11/14/2017, 12/15/2017. Values of 1035 records in Pressure are missing for dates: 07/20/2016-07/31/2016, 03/30/2017, 09/06/2017. Values of 471 records in Pressure_Corrected were flagged as F (undefined flag) for dates: 10/26/2017-10/31/2017. Values of 784 records in Pressure_Corrected were flagged as P (value recorded during or following well pumping event) for dates: 02/15/2016, 02/28/2016-02/29/2016, 03/10/2016, 03/22/2016, 03/24/2016-03/25/2016, 04/13/2016, 04/27/2016, 05/23/2016, 05/26/2016, 06/05/2016, 06/14/2016, 07/15/2016, 07/20/2016, 08/23/2016, 09/13/2016, 09/28/2016, 10/14/2016, 11/01/2016, 11/17/2016-11/18/2016, 12/07/2016, 01/11/2017, 01/19/2017, 02/16/2017, 03/08/2017, 04/23/2017-04/24/2017, 06/01/2017, 08/04/2017, 09/06/2017, 09/07/2017, 09/08/2017, 09/09/2017, 09/10/2017, 09/10/2017-09/11/2017, 09/11/2017-09/12/2017, 09/13/2017, 09/14/2017, 09/15/2017, 09/16/2017, 10/24/2017, 11/14/2017, 12/15/2017, 01/01/2018, 01/03/2018. Values of 1035 records in Pressure_Corrected are missing for dates: 07/20/2016-07/31/2016, 03/30/2017, 09/06/2017. Values of 471 records in Depth were flagged as F (undefined flag) for dates: 10/26/2017-10/31/2017. Values of 450 records in Depth were flagged as P (value recorded during or following well pumping event) for dates: 02/15/2016, 02/28/2016-02/29/2016, 03/10/2016, 03/22/2016, 03/24/2016-03/25/2016, 04/13/2016, 04/27/2016, 05/23/2016, 05/26/2016, 06/05/2016, 06/14/2016, 07/15/2016, 07/20/2016, 08/23/2016, 09/13/2016, 09/28/2016, 10/14/2016, 11/01/2016, 11/17/2016-11/18/2016, 12/07/2016, 01/11/2017, 01/19/2017, 02/16/2017, 03/08/2017, 04/23/2017-04/24/2017, 06/01/2017, 08/04/2017, 09/06/2017, 10/24/2017, 11/14/2017, 12/15/2017, 01/01/2018, 01/03/2018. Values of 1035 records in Depth are missing for dates: 07/20/2016-07/31/2016, 03/30/2017, 09/06/2017. Values of 471 records in Depth_Corrected were flagged as F (undefined flag) for dates: 10/26/2017-10/31/2017. Values of 450 records in Depth_Corrected were flagged as P (value recorded during or following well pumping event) for dates: 02/15/2016, 02/28/2016-02/29/2016, 03/10/2016, 03/22/2016, 03/24/2016-03/25/2016, 04/13/2016, 04/27/2016, 05/23/2016, 05/26/2016, 06/05/2016, 06/14/2016, 07/15/2016, 07/20/2016, 08/23/2016, 09/13/2016, 09/28/2016, 10/14/2016, 11/01/2016, 11/17/2016-11/18/2016, 12/07/2016, 01/11/2017, 01/19/2017, 02/16/2017, 03/08/2017, 04/23/2017-04/24/2017, 06/01/2017, 08/04/2017, 09/06/2017, 10/24/2017, 11/14/2017, 12/15/2017, 01/01/2018, 01/03/2018. Values of 1035 records in Depth_Corrected are missing for dates: 07/20/2016-07/31/2016, 03/30/2017, 09/06/2017. Values of 471 records in Water_Level were flagged as F (undefined flag) for dates: 10/26/2017-10/31/2017. Values of 450 records in Water_Level were flagged as P (value recorded during or following well pumping event) for dates: 02/15/2016, 02/28/2016-02/29/2016, 03/10/2016, 03/22/2016, 03/24/2016-03/25/2016, 04/13/2016, 04/27/2016, 05/23/2016, 05/26/2016, 06/05/2016, 06/14/2016, 07/15/2016, 07/20/2016, 08/23/2016, 09/13/2016, 09/28/2016, 10/14/2016, 11/01/2016, 11/17/2016-11/18/2016, 12/07/2016, 01/11/2017, 01/19/2017, 02/16/2017, 03/08/2017, 04/23/2017-04/24/2017, 06/01/2017, 08/04/2017, 09/06/2017, 10/24/2017, 11/14/2017, 12/15/2017, 01/01/2018, 01/03/2018. Values of 1035 records in Water_Level are missing for dates: 07/20/2016-07/31/2016, 03/30/2017, 09/06/2017. Values of 471 records in Pressure_Atm were flagged as F (undefined flag) for dates: 10/26/2017-10/31/2017. Values of 1035 records in Pressure_Atm are missing for dates: 07/20/2016-07/31/2016, 03/30/2017, 09/06/2017. Values of 1153 records in Temp_Water were flagged as P (value recorded during or following well pumping event) for dates: 02/15/2016, 02/28/2016-02/29/2016, 03/22/2016-03/23/2016, 03/24/2016-03/25/2016, 04/13/2016, 04/27/2016, 05/23/2016-05/24/2016, 05/26/2016-05/27/2016, 06/05/2016-06/06/2016, 06/14/2016-06/15/2016, 07/15/2016-07/16/2016, 07/20/2016-07/21/2016, 08/23/2016, 09/13/2016, 09/28/2016-09/29/2016, 10/14/2016-10/15/2016, 11/01/2016-11/02/2016, 11/17/2016-11/18/2016, 12/07/2016-12/08/2016, 01/11/2017-01/12/2017, 01/19/2017, 02/16/2017-02/17/2017, 03/08/2017-03/09/2017, 04/23/2017-04/24/2017, 06/01/2017-06/02/2017, 08/04/2017-08/05/2017, 09/06/2017-09/07/2017, 10/24/2017, 11/14/2017-11/15/2017, 12/15/2017-12/16/2017. Values of 26 records in Temp_Water were flagged as Q (questionable value) for dates: 01/02/2018, 01/03/2018, 01/04/2018, 01/05/2018. Values of 1035 records in Temp_Water are missing for dates: 07/20/2016-07/31/2016, 03/30/2017, 09/06/2017. Values of 1153 records in Conductivity were flagged as P (value recorded during or following well pumping event) for dates: 02/15/2016, 02/28/2016-02/29/2016, 03/22/2016-03/23/2016, 03/24/2016-03/25/2016, 04/13/2016, 04/27/2016, 05/23/2016-05/24/2016, 05/26/2016-05/27/2016, 06/05/2016-06/06/2016, 06/14/2016-06/15/2016, 07/15/2016-07/16/2016, 07/20/2016-07/21/2016, 08/23/2016, 09/13/2016, 09/28/2016-09/29/2016, 10/14/2016-10/15/2016, 11/01/2016-11/02/2016, 11/17/2016-11/18/2016, 12/07/2016-12/08/2016, 01/11/2017-01/12/2017, 01/19/2017, 02/16/2017-02/17/2017, 03/08/2017-03/09/2017, 04/23/2017-04/24/2017, 06/01/2017-06/02/2017, 08/04/2017-08/05/2017, 09/06/2017-09/07/2017, 10/24/2017, 11/14/2017-11/15/2017, 12/15/2017-12/16/2017. Values of 1035 records in Conductivity are missing for dates: 07/20/2016-07/31/2016, 03/30/2017, 09/06/2017. Values of 471 records in Salinity were flagged as F (undefined flag) for dates: 10/26/2017-10/31/2017. Values of 1122 records in Salinity were flagged as P (value recorded during or following well pumping event) for dates: 02/15/2016, 02/28/2016-02/29/2016, 03/10/2016, 03/22/2016-03/23/2016, 03/24/2016-03/25/2016, 04/13/2016, 04/27/2016, 05/23/2016-05/24/2016, 05/26/2016-05/27/2016, 06/05/2016-06/06/2016, 06/14/2016-06/15/2016, 07/15/2016-07/16/2016, 07/20/2016, 08/23/2016, 09/13/2016, 09/28/2016-09/29/2016, 10/14/2016-10/15/2016, 11/01/2016-11/02/2016, 11/17/2016-11/18/2016, 12/07/2016-12/08/2016, 01/11/2017-01/12/2017, 01/19/2017, 02/16/2017-02/17/2017, 03/08/2017-03/09/2017, 04/23/2017-04/24/2017, 06/01/2017-06/02/2017, 08/04/2017-08/05/2017, 09/06/2017, 10/24/2017, 11/14/2017-11/15/2017, 12/15/2017-12/16/2017, 01/01/2018, 01/03/2018. Values of 22 records in Salinity were flagged as Q (questionable value) for dates: 01/02/2018, 01/03/2018, 01/04/2018, 01/05/2018. Values of 1035 records in Salinity are missing for dates: 07/20/2016-07/31/2016, 03/30/2017, 09/06/2017. Values of 471 records in Density were flagged as F (undefined flag) for dates: 10/26/2017-10/31/2017. Values of 1194 records in Density were flagged as P (value recorded during or following well pumping event) for dates: 02/15/2016, 02/28/2016-02/29/2016, 03/10/2016, 03/22/2016-03/23/2016, 03/24/2016-03/25/2016, 04/13/2016, 04/27/2016, 05/23/2016-05/24/2016, 05/26/2016-05/27/2016, 06/05/2016-06/06/2016, 06/14/2016-06/15/2016, 07/15/2016-07/16/2016, 07/20/2016, 07/31/2016, 08/23/2016, 09/13/2016, 09/28/2016-09/29/2016, 10/14/2016-10/15/2016, 11/01/2016-11/02/2016, 11/17/2016-11/18/2016, 12/07/2016-12/08/2016, 01/11/2017-01/12/2017, 01/19/2017, 02/16/2017-02/17/2017, 03/08/2017-03/09/2017, 04/23/2017-04/24/2017, 06/01/2017-06/02/2017, 08/04/2017-08/05/2017, 09/06/2017, 09/06/2017-09/07/2017, 10/24/2017, 11/14/2017-11/15/2017, 12/15/2017-12/16/2017, 01/01/2018, 01/03/2018. Values of 22 records in Density were flagged as Q (questionable value) for dates: 01/02/2018, 01/03/2018, 01/04/2018, 01/05/2018. Values of 1035 records in Density are missing for dates: 07/20/2016-07/31/2016, 03/30/2017, 09/06/2017. V. Supplemental Descriptors A. Data Acquisition 1. Data Forms: Digital copies of data logger files are maintained in the GCE-LTER Information Management office and UGA Marine Institute on Sapelo Island. 2. Form Location: GCE-LTER Information Management Office, Dept. of Marine Sciences, University of Georgia, Athens, GA 30602 3. Data Entry Validation: B. Quality Assurance/Quality Control Procedures: QA/QC flags are generated automatically according to domain criteria specified for each data column, then subsequently reviewed and revised as appropriate. Coded flag columns are generated for each data column, listing qualifier flags assigned to the data value on the corresponding row. C. Supplemental Materials: not applicable D. Computer Programs: MATLAB R2009B E. Archival Practices: Data sets and documentation are stored in structured binary (Matlab 6.x files) and delimited ASCII text formats, and archived on magnetic tape and CD at the GCE LTER Information Management Office at the University of Georgia, Athens, Georgia, USA F. Publications: not specified G. History of Data Set Usage 1. Data Request History: not specified 2. Data Set Update History: none 3. Review History: none 4. Questions and Comments from Users: none