I. Data Set Descriptors A. Title: Daniela Di Iorio. 2023. Continuous salinity, temperature and depth measurements from moored hydrographic data loggers deployed at GCE6_Hydro (Doboy Sound south of Sapelo Island, Georgia) from 01-Jan-2022 through 31-Dec-2022. Georgia Coastal Ecosystems LTER Data Catalog (data set PHY-GCEM-2311d; /data/PHY-GCEM-2311d) B. Accession Number: PHY-GCEM-2311d C. Description 1. Originator(s): Name: Daniela Di Iorio Address: Dept. of Marine Sciences University of Georgia Athens, Georgia 30602-3636 Country: USA Email: daniela@uga.edu 2. Abstract: Conductivity, temperature and pressure were measured continuously at Georgia Coastal Ecosystems LTER sampling location GCE6_Hydro (Doboy Sound south of Sapelo Island, Georgia) from 01-Jan-2022 through 31-Dec-2022. Observations were logged at 30 minute intervals by moored Sea-Bird Electronics MicroCAT 37-SM data loggers and downloaded approximately quarterly. Salinity, depth and sigma-t (density anomaly) were calculated from the measured parameters using standard UNESCO algorithms. This data set was collected as part of the GCE-LTER Project continuous salinity, temperature and water level monitoring program. 3. Study Type: Monitoring 4. Study Themes: Physical Oceanography 5. LTER Core Areas: Other Site Research 6. Georeferences: geographic coordinates as data columns 7. Submission Date: Mar 03, 2023 D. Keywords: conductivity, density, depth, GCE, Georgia, Georgia Coastal Ecosystems, Hydrographic Moorings, hydrography, Inorganic Fluxes, inorganic nutrients, LTER, monitoring, mooring, pressure, salinity, Sapelo Island, sonde, temperature, USA, water column, water quality II. Research Origin Descriptors A. Overall Project Description 1. Project Title: Georgia Coastal Ecosystems LTER - IV 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: Feb 01, 2019 to Jan 31, 2025 4. Objectives: The GCE-LTER project has four goals. 1) Track environmental and human drivers that can cause perturbations in our focal ecosystems. This will be accomplished this through continuing long-term measurements of climate, water chemistry, oceanic exchange, and human activities on the landscape. 2) Describe temporal and spatial variability in physical, chemical, geological and biological characteristics of the study system (coastal wetland complexes) and how they respond to external drivers. This will be accomplished through field monitoring in combination with remote sensing and modeling. 3) Characterize the ecological responses of intertidal marshes to disturbance. This will be accomplished by ongoing monitoring and experimental work to evaluate system responses to major perturbations in three key marsh habitats (changes in inundation and predator exclusion in Spartina-dominated salt marshes; increases in salinity in fresh marshes; changes in runoff in high marshes), by implementing standardized experimental disturbances along salinity and elevation gradients, and by tracking responses to natural disturbances. 4) Evaluate ecosystem properties at the landscape level (habitat distribution, net and gross primary production, C budgets) and assess the cumulative effects of disturbance on these properties. The project will also develop relationships between drivers and response variables, which can be used to predict the effects of future changes. This will be accomplished through a combination of data synthesis, remote sensing and modeling. 5. Abstract: The Georgia Coastal Ecosystems (GCE) Long Term Ecological Research (LTER) program, based at the University of Georgia Marine Institute on Sapelo Island, Georgia, was established in 2000 to study long-term change in coastal ecosystems. Estuaries (places where salt water from the ocean mixes with fresh water from the land) and their adjacent marshes provide food and refuge for fish, shellfish and birds; protect the shoreline from storms; help to keep the water clean; and store carbon. The GCE LTER researchers study marshes and estuaries to understand how these ecosystems function, to track how they change over time, and to predict how they might be affected by future changes in climate and human activities. They accomplish this by tracking the major factors that can cause long-term change in coastal areas (e.g. sea level, rainfall, upstream development), and measuring the effects of these factors on the study site. They also conduct focused studies to assess how key marsh habitats will respond to major changes expected in the future, including large-scale experiments to evaluate the effects of a) increases in the salinity of the water that floods freshwater marshes (mimicking drought and/or sea level rise), b) changes in water runoff from land into the upland marsh border (mimicking drought or upland development), and c) exclusion of larger organisms in the salt marsh (mimicking long-term declines in predators). During this award they will initiate additional studies to systematically evaluate how coastal wetlands respond to disturbances. Disturbances, or disruptions in the environment, are particularly important to understand in the context of long-term background changes such as increasing sea level, and GCE researchers are working to assess the cumulative effects of multiple disturbances on the landscape. The GCE education and outreach program works to share an understanding of coastal ecosystems with teachers and students, coastal managers, citizen scientist and the general public. 6. Funding Source: NSF OCE 1832178 B. Sub-project Description 1. Site Description a. Geographic Location: GCE-DB -- Doboy Sound, Georgia, USA GCE6_Hydro2 -- Doboy Sound hydrographic datalogger deployment south of Sapelo Island (new piling July 2012) Coordinates: GCE-DB -- NW: 081 22 05.66 W, 31 27 20.39 N NE: 081 14 34.64 W, 31 27 20.39 N SE: 081 14 34.64 W, 31 20 27.39 N SW: 081 22 05.66 W, 31 20 27.39 N GCE6_Hydro2 -- 81 18 17.7 W, 31 23 36.5 N b. Physiographic Region: GCE-DB -- Estuary and tidal marsh GCE6_Hydro2 -- Estuary and tidal marsh c. Landform Components: GCE-DB -- Intertidal marsh bordering sounds, tidal channels and creeks GCE6_Hydro2 -- Intertidal marsh bordering sounds, tidal channels and creeks d. Hydrographic Characteristics: GCE-DB -- Site encompasses Doboy Sound and nearby tidal channels and creeks, and is subject to 2-3.4m semi-diurnal tides. GCE6_Hydro2 -- Site encompasses Doboy Sound and nearby tidal channels and creeks, and is subject to 2-3.4m semi-diurnal tides. e. Topographic Attributes: GCE-DB -- Flat, with elevations ranging from 0-3.4m above mean low tide GCE6_Hydro2 -- Flat, with elevations ranging from 0-3.4m above mean low tide f. Geology, Lithology and Soils: GCE-DB -- unspecified GCE6_Hydro2 -- unspecified g. Vegetation Communities: GCE-DB -- unspecified GCE6_Hydro2 -- unspecified 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: Conductivity, temperature and pressure were continuously monitored using an autonomous data-logging sensor package (sonde) that was moored to a piling and submerged 1-1.5m below mean low water. b. Permanent Plots: none c. Data Collection Duration and Frequency: The MicroCAT was programmed to autonomously measure and log conductivity, temperature and pressure at a sampling rate of 30 minutes (based on its internal chronometer). Upon retrieval the data was downloaded from the instrument via RS-232 serial communications and processed using custom Matlab(r) procedures to calculate depth (i.e. from pressure and latitude), salinity and sigma-t (i.e. from conductivity and temperature), and date and time components from sample time stamps. Beginning of Observations: Jan 01, 2022 End of Observations: Dec 31, 2022 3. Research Methods a. Field and Laboratory Methods: Method 1: Deployment -- The MicroCAT was mounted inside a protective PVC pipe enclosure and attached to a wooden piling (~12 inch diameter) that was driven firmly into the substrate. The enclosure was constructed from a 10-foot length of 6-inch (internal diameter) PVC pipe that was perforated all over by drilling 1.5-inch holes (at approximately 4-inch spacing); this permits proper water circulation within the enclosure. The bottom of the PVC pipe was submerged about 5 feet below the water surface at low tide and bolted (vertically) to the piling. The MicroCAT was deployed by lowering it into the enclosure on a 0.375-inch stainless steel cable, and bolting the cable to the piling, so that the bottom of the data logger was ~3 inches above the bottom of the PVC pipe. A weighted surveyor's tape was then used to measure the distance from the substrate to the pressure sensor on the MicroCAT for calculation of total water column depth from pressure readings. The mooring was inspected every 1-3 weeks, and any visible fouling of the enclosure or MicroCAT was removed with a brush or scaper. Method 2: Retrieval and Calibration -- At the end of each measurement period (approximately 2 months), the MicroCAT was unshackled from the cable and returned to the laboratory. The stored data was uploaded to a computer using a RS-232 serial cable and Sea-Bird Electronics SEATERM software. The MicroCAT was then cleaned to remove encrusting material and calibrated with a reference instrument at 4 to 5 salinity levels, generally ranging from 30 to 5 PSU. Method 3: Data Processing -- Data were processed after each retrieval using custom programs in the GCE Data Toolbox for MATLAB (parse_37sm and imp_gcesonde). Depth was calculated from recorded pressure and latitude values, and salinity and sigma-t were calculated from recorded conductivity and temperature values using standard UNESCO algorithms (reference: Unesco. 1983. Algorithms for computation of fundamental properties of seawater, 1983. Unesco Technical Papers in Marine Science No. 44, 53 pp.). Data were then plotted and visually inspected for evidence of biofouling of the conductivity sensor (i.e. prolonged periods of damped tidal oscillation in conductivity signal with no corresponding changes in temperature signal and no wind or rainfall events recorded at nearby monitoring stations, or periods of damped oscillation immediately followed by normal oscillation after instrument maintenance or replacement). Conductivity values recorded during periods of suspected biofouling were flagged as I (invalid) if visible fouling was noted in maintenance logs, and Q (questionable) if no visible fouling was noted. Method 4: Daily Aggregation -- The finalized 30-minute resolution data set was filtered to remove any remaining invalid values (i.e. assigned qualifier flags of 'I' = invalid value or 'X' = excise row), then padded with empty rows to produce a monotonic time series data set with even time steps. The data records were then aggregated (grouped) by Year, Month, Day, Site, Longitude and Latitude, and relevant summary statistics were calculated for each measured variable in each group and added as data columns. Quality control rules were defined for each calculated column to flag statistics based on days with more than 35% missing values as invalid, and more than 10% missing values or 35% flagged values as questionable. Columns listing the number and percentage of missing and flagged values in the original data set for each day were also added as data columns for reference by quality control rules. Following aggregation, summary statistics flagged as invalid were removed from the daily-aggregated data set and converted to missing (NaN). b. Protocols: Method 1: none Method 2: none Method 3: none Method 4: none c. Instrumentation: Method 1: SBE MicroCAT 37-SM (S/N 16698) Manufacturer: Sea-Bird Electronics (Model: 37-SM MicroCAT) Last Calibration: Mar 08, 2018 Parameter: Conductivity (Accuracy: 0.0003 S/m, Readability: 0.00001 S/m, Range: 0 to 7 S/m) Protocol: Water passively circulates through an open internal-field conductivity cell equipped with an external tributyl tin antifoulant dispenser, and conductivity is measured using an ultra-precision Wien-Bridge oscillator with frequency counted by a high-stability reference crystal (<2 ppm/year drift rate). Parameter: Pressure (water) (Accuracy: 0.2m, Readability: 0.0004m, Range: 0 to 20m) Protocol: Pressure is measured using a micro-machined silicon diaphragm with embedded strain elements, and temperature compensation is performed by the SBE MicroCAT onboard cpu. Parameter: Temperature (water) (Accuracy: 0.002°C, Readability: 0.0001°C, Range: -5 to 35°C) Protocol: Temperature is measured by applying an AC excitation to a hermetically-sealed VISHAY reference resistor and an ultra-stable aged thermistor (drift rate typically less than 0.002°C/year). SBE MicroCAT 37-SM (S/N 1793) Manufacturer: Sea-Bird Electronics (Model: 37-SM MicroCAT) Last Calibration: Jul 28, 2019 Parameter: Conductivity (Accuracy: 0.0003 S/m, Readability: 0.00001 S/m, Range: 0 to 7 S/m) Protocol: Water passively circulates through an open internal-field conductivity cell equipped with an external tributyl tin antifoulant dispenser, and conductivity is measured using an ultra-precision Wien-Bridge oscillator with frequency counted by a high-stability reference crystal (<2 ppm/year drift rate). Parameter: Pressure (water) (Accuracy: 0.2m, Readability: 0.0004m, Range: 0 to 20m) Protocol: Pressure is measured using a micro-machined silicon diaphragm with embedded strain elements, and temperature compensation is performed by the SBE MicroCAT onboard cpu. Parameter: Temperature (water) (Accuracy: 0.002°C, Readability: 0.0001°C, Range: -5 to 35°C) Protocol: Temperature is measured by applying an AC excitation to a hermetically-sealed VISHAY reference resistor and an ultra-stable aged thermistor (drift rate typically less than 0.002°C/year). SBE MicroCAT 37-SM (S/N 3746) Manufacturer: Sea-Bird Electronics (Model: 37-SM MicroCAT) Last Calibration: Jan 19, 2020 Parameter: Conductivity (Accuracy: 0.0003 S/m, Readability: 0.00001 S/m, Range: 0 to 7 S/m) Protocol: Prior to each timed measurement the conductivity cell is opened and water is pumped for 0.5 sec, then conductivity is measured using an ultra-precision Wien-Bridge oscillator with frequency counted by a high-stability reference crystal (<2 ppm/year drift rate). The cell is closed between measurements and tributyl tin antifoulant is released into the tubing. Parameter: Pressure (water) (Accuracy: 0.2m, Readability: 0.0004m, Range: 0 to 20m) Protocol: Pressure is measured using a micro-machined silicon diaphragm with embedded strain elements, and temperature compensation is performed by the SBE MicroCAT onboard cpu. Parameter: Temperature (water) (Accuracy: 0.002°C, Readability: 0.0001°C, Range: -5 to 35°C) Protocol: Temperature is measured by applying an AC excitation to a hermetically-sealed VISHAY reference resistor and an ultra-stable aged thermistor (drift rate typically less than 0.002°C/year). Method 2: none Method 3: none Method 4: none d. Taxonomy and Systematics: Method 1: Method 2: Method 3: Method 4: e. Speclies List: f. Permit History: Method 1: none Method 2: none Method 3: none Method 4: none 4. Project Personnel a. Personnel: 1: Daniela Di Iorio 2: Wade M. Sheldon, Jr. 3: Adam Sapp 4: John Thomas Williams 5: Jonah Michael Rigdon 6: Laura Price Hollander b. Affiliations: 1: University of Georgia, Athens, Georgia 2: University of Georgia, Athens, Georgia 3: University of Georgia, Athens, Georgia 4: University of Georgia Marine Institute, Sapelo Island, GA 5: University of Georgia Marine Institute 6: University of Georgia, Sapelo Island, Georgia III. Data Set Status and Accessibility A. Status 1. Latest Update: 03-Mar-2024 2. Latest Archive Date: 03-Mar-2024 3. Latest Metadata Update: 03-Mar-2024 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: Adam Sapp Address: Department of Marine Sciences University of Georgia Athens, Georgia 30602 Country: USA Email: asapp@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 03, 2023, Public: Mar 03, 2023 b. Citation: Data provided by the Georgia Coastal Ecosystems Long Term Ecological Research Project, supported by funds from NSF OCE 1832178 (data set PHY-GCEM-2311d) 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: PHY-GCEM-2311d_1_0.CSV 2. Size: 17520 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: none 6. Quality Control Flag Codes: Q = questionable value, I = invalid value (out of range), S = spike/noise, X = excise row flag, E = data value estimated by interpolation 7. Authentication Procedures: not specified 8. Calculations: Depth(m) = sw_dpth(Pressure(dbar),Latitude(deg)) -- sw_dpth (salt water depth from pressure) Matlab function, Revision: 1.3, Date: 10-Oct-1994 (C)1992 CSIRO, Phil Morgan (morgan@ml.csiro.au) [Salinity(psu),Sigma_t] = salsig2(Depth(m),Temperature(C),Conductivity(mmho/cm)) -- salsig2 (salinity and sigma-t from conductivity, temperature and depth) Matlab function Revision 06-May-1992 by V. Holliday, as modified by Tom Gross and Julie Amft (julie@skio.peachnet.edu) 9. Processing History: Software version: GCE Data Toolbox Version 3.9.10 (23-May-2022) Data structure version: GCE Data Structure 1.1 (29-Mar-2001) Original data files processed: 062203698.cnv (5671 records) 062206060.cnv (4755 records) 06220961.asc (4378 records) 06221256.cnv (4085 records) 062303299.cnv (4952 records) Data processing history: 23-Mar-2022: data uploaded from SBE 37-SM MicroCAT using SEATERM software version SeatermV2 2.5.0.153 04-Apr-2022: new GCE Data Structure 1.1 created ('newstruct') 04-Apr-2022: data imported from processed SBE SM-37 sonde data file '062203698.cnv' (5671 records) ('imp_gcesonde') 04-Apr-2022: deleted column Second from the structure ('deletecols') 04-Apr-2022: calculated calendar date in MATLAB serial day (base 1/1/0000) format from individual date component columns Year, Month, Day, Hour and Minute, added 'Date' column at position 1 ('add_datecol') 04-Apr-2022: added column 'Instrument' at position 1 ('addcol') 04-Apr-2022: added column 'Latitude' at position 1 ('addcol') 04-Apr-2022: Q/C flagging criteria applied for column(s) Latitude, 'flags' field updated ('dataflag') 04-Apr-2022: added column 'Longitude' at position 1 ('addcol') 04-Apr-2022: Q/C flagging criteria applied for column(s) Longitude, 'flags' field updated ('dataflag') 04-Apr-2022: added column 'Site' at position 1 ('addcol') 04-Apr-2022: matched 5671 out of 5671 geographic coordinates in columns Latitude and Longitude to coordinates for registered locations in the file 'geo_locations.mat' within a distance tolerance of 0.5km (add_locations) 04-Apr-2022: added column 'Station' at position 2 ('addcol') 04-Apr-2022: Q/C flagging criteria applied for column(s) Station, 'flags' field updated ('dataflag') 04-Apr-2022: added geographic metadata based on matching values in column Station to location and station names registered in 'geo_locations.mat' ('add_sitemetadata') 04-Apr-2022: updated 8 metadata fields in the Site sections ('addmeta') 04-Apr-2022: added column 'Calibration' at position 18 ('addcol') 04-Apr-2022: Q/C flagging criteria applied for column(s) Calibration, 'flags' field updated ('dataflag') 04-Apr-2022: updated 13 metadata fields in the Data, Dataset, Status, Study, Supplement sections ('addmeta') 04-Apr-2022: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 04-Apr-2022: edited structure data ('ui_datagrid'): deleted record(s) 5666, 5667, 5668, 5669, 5670 and 5671 04-Apr-2022: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 04-Apr-2022: QA/QC flags assigned by visual inspection (ui_visualqc); flags set on Pressure record(s): 5663, 5664 and 5665 04-Apr-2022: copied QA/QC flags from column(s) Temperature, Conductivity and Pressure to column(s) Salinity and Sigma_t, merging copied flags with any existing flags, and set QA/QC criteria for destination column(s) to 'manual' ('copyflags') 04-Apr-2022: deleted the following rows with values in column(s) Pressure or Depth assigned QA/QC flag(s) X (excise row flag): 5663, 5664 and 5665. ('cullflags') 04-Apr-2022: query 'Year==2022' run, returned 3491 of 5662 data rows ('querydata') 04-Apr-2022: automatically assigned study date metadata descriptors based on the range of date values in date/time columns (add_studydates) 04-Apr-2022: manually edited data set metadata ('ui_editmetadata') 04-Apr-2022: edited data set title in structure and metadata ('ui_editor') 13-Oct-2022: 4747 rows added at the bottom of the data set from 'Data from Sea-Bird Electronics 37-SM MicroCAT sonde S/N 24060 deployed at GCE6_Hydro2 (Doboy Sound hydrographic datalogger deployment south of Sapelo Island (new piling July 2012)) from 14-Mar-2022 to 21-Jun-2022' ('datamerge') 13-Oct-2022: updated 13 metadata fields in the Data, Dataset, Status, Study, Supplement sections ('addmeta') 13-Oct-2022: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 13-Oct-2022: 4368 rows added at the bottom of the data set from 'Data from Sea-Bird Electronics 37-SM MicroCAT sonde S/N 4961 deployed at GCE6_Hydro2 (Doboy Sound hydrographic datalogger deployment south of Sapelo Island (new piling July 2012)) from 21-Jun-2022 to 20-Sep-2022' ('datamerge') 13-Oct-2022: updated 13 metadata fields in the Data, Dataset, Status, Study, Supplement sections ('addmeta') 13-Oct-2022: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 13-Oct-2022: manually edited data set metadata ('ui_editmetadata') 13-Oct-2022: edited data set title in structure and metadata ('ui_editor') 13-Oct-2022: inserted 1 new record with date/time values and NaN/null data values (replicating common values in the non-data columns Site, Station, Longitude, Latitude, Instrument and Calibration) to fill in date/time interval gaps in the data series ('pad_date_gaps') 13-Oct-2022: sorted by column Date(ascending) ('sortdata') 13-Oct-2022: deleted existing datetime columns Year, Month, Day, Hour and Minute; updated Year, Month, Day, Hour and Minute datetime columns added after column Date ('add_datepartcols') 13-Oct-2022: updated 1 metadata fields in the Data sections ('addmeta') 13-Oct-2022: sorted by columns Site(ascending), Station(ascending), Longitude(ascending), Latitude(ascending), Date(ascending) ('sortdata') 13-Oct-2022: sorted by columns Site(ascending), Station(ascending), Longitude(ascending), Latitude(ascending) ('sortdata') 13-Oct-2022: replaced 1 missing value in column Temperature with an estimated value based on 1D interpolation of Temperature as a function of Date using the MATLAB 9.5 function 'interp1' with the 'pchip' (piecewise cubic Hermite interpolation) method option, excluding data gaps with more than 12 consecutive missing values, and flagging the estimated values as 'E'' ('interp_missing') 13-Oct-2022: 1 value in 'Temperature' was updated with a new value ('update_data'): changed record 8239 from NaN to 28.797 13-Oct-2022: Q/C flagging criteria applied for column(s) Temperature, 'flags' field updated ('dataflag') 13-Oct-2022: replaced 1 missing value in column Conductivity with an estimated value based on 1D interpolation of Conductivity as a function of Date using the MATLAB 9.5 function 'interp1' with the 'pchip' (piecewise cubic Hermite interpolation) method option, excluding data gaps with more than 12 consecutive missing values, and flagging the estimated values as 'E'' ('interp_missing') 13-Oct-2022: 1 value in 'Conductivity' was updated with a new value ('update_data'): changed record 8239 from NaN to 4.591 13-Oct-2022: Q/C flagging criteria applied for column(s) Conductivity, 'flags' field updated ('dataflag') 13-Oct-2022: replaced 1 missing value in column Pressure with an estimated value based on 1D interpolation of Pressure as a function of Date using the MATLAB 9.5 function 'interp1' with the 'pchip' (piecewise cubic Hermite interpolation) method option, excluding data gaps with more than 12 consecutive missing values, and flagging the estimated values as 'E'' ('interp_missing') 13-Oct-2022: 1 value in 'Pressure' was updated with a new value ('update_data'): changed record 8239 from NaN to 1.540 13-Oct-2022: Q/C flagging criteria applied for column(s) Pressure, 'flags' field updated ('dataflag') 13-Oct-2022: replaced 1 missing value in column Depth with an estimated value based on 1D interpolation of Depth as a function of Date using the MATLAB 9.5 function 'interp1' with the 'pchip' (piecewise cubic Hermite interpolation) method option, excluding data gaps with more than 12 consecutive missing values, and flagging the estimated values as 'E'' ('interp_missing') 13-Oct-2022: 1 value in 'Depth' was updated with a new value ('update_data'): changed record 8239 from NaN to 1.529 13-Oct-2022: Q/C flagging criteria applied for column(s) Depth, 'flags' field updated ('dataflag') 13-Oct-2022: replaced 1 missing value in column Salinity with an estimated value based on 1D interpolation of Salinity as a function of Date using the MATLAB 9.5 function 'interp1' with the 'pchip' (piecewise cubic Hermite interpolation) method option, excluding data gaps with more than 12 consecutive missing values, and flagging the estimated values as 'E'' ('interp_missing') 13-Oct-2022: 1 value in 'Salinity' was updated with a new value ('update_data'): changed record 8239 from NaN to 27.417 13-Oct-2022: Q/C flagging criteria applied for column(s) Salinity, 'flags' field updated ('dataflag') 13-Oct-2022: replaced 1 missing value in column Sigma_t with an estimated value based on 1D interpolation of Sigma_t as a function of Date using the MATLAB 9.5 function 'interp1' with the 'pchip' (piecewise cubic Hermite interpolation) method option, excluding data gaps with more than 12 consecutive missing values, and flagging the estimated values as 'E'' ('interp_missing') 13-Oct-2022: 1 value in 'Sigma_t' was updated with a new value ('update_data'): changed record 8239 from NaN to 16.444 13-Oct-2022: Q/C flagging criteria applied for column(s) Sigma_t, 'flags' field updated ('dataflag') 01-Aug-2023: 4075 rows added at the bottom of the data set from 'Data from Sea-Bird Electronics 37-SM MicroCAT sonde S/N 24056 deployed at GCE6_Hydro2 (Doboy Sound hydrographic datalogger deployment south of Sapelo Island (new piling July 2012)) from 20-Sep-2022 to 14-Dec-2022' ('datamerge') 01-Aug-2023: updated 13 metadata fields in the Data, Dataset, Status, Study, Supplement section(s) ('addmeta') 01-Aug-2023: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 01-Aug-2023: 4943 rows added at the bottom of the data set from 'Data from Sea-Bird Electronics 37-SM MicroCAT sonde S/N 22299 deployed at GCE6_Hydro2 (Doboy Sound hydrographic datalogger deployment south of Sapelo Island (new piling July 2012)) from 14-Dec-2022 to 27-Mar-2023' ('datamerge') 01-Aug-2023: updated 13 metadata fields in the Data, Dataset, Status, Study, Supplement section(s) ('addmeta') 01-Aug-2023: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 01-Aug-2023: query 'Year==2022' run, returned 17519 of 21625 data rows ('querydata') 01-Aug-2023: automatically assigned study date metadata descriptors based on the range of date values in date/time columns (add_studydates) 01-Aug-2023: manually edited data set metadata ('ui_editmetadata') 01-Aug-2023: edited data set title in structure and metadata ('ui_editor') 01-Aug-2023: inserted 1 new record with date/time values and NaN/null data values (replicating common values in the non-data columns Site, Station, Longitude, Latitude, Instrument and Calibration) to fill in date/time interval gaps in the data series ('pad_date_gaps') 01-Aug-2023: sorted by column Date(ascending) ('sortdata') 01-Aug-2023: deleted existing datetime columns Year, Month, Day, Hour and Minute; updated Year, Month, Day, Hour and Minute datetime columns added after column Date ('add_datepartcols') 01-Aug-2023: updated 1 metadata fields in the Data section(s) ('addmeta') 01-Aug-2023: sorted by column Date(ascending) ('sortdata') 01-Aug-2023: replaced 1 missing value in column Temperature with an estimated value based on 1D interpolation of Temperature as a function of Date using the MATLAB 9.5 function 'interp1' with the 'pchip' (piecewise cubic Hermite interpolation) method option, excluding data gaps with more than 12 consecutive missing values, and flagging the estimated values as 'E' ('interp_missing') 01-Aug-2023: 1 value in 'Temperature' was updated with a new value ('update_data'): changed record 16683 from NaN to 16.644 01-Aug-2023: Q/C flagging criteria applied for column(s) Temperature, 'flags' field updated ('dataflag') 01-Aug-2023: replaced 1 missing value in column Conductivity with an estimated value based on 1D interpolation of Conductivity as a function of Date using the MATLAB 9.5 function 'interp1' with the 'pchip' (piecewise cubic Hermite interpolation) method option, excluding data gaps with more than 12 consecutive missing values, and flagging the estimated values as 'E' ('interp_missing') 01-Aug-2023: 1 value in 'Conductivity' was updated with a new value ('update_data'): changed record 16683 from NaN to 3.737 01-Aug-2023: Q/C flagging criteria applied for column(s) Conductivity, 'flags' field updated ('dataflag') 01-Aug-2023: replaced 1 missing value in column Pressure with an estimated value based on 1D interpolation of Pressure as a function of Date using the MATLAB 9.5 function 'interp1' with the 'pchip' (piecewise cubic Hermite interpolation) method option, excluding data gaps with more than 12 consecutive missing values, and flagging the estimated values as 'E' ('interp_missing') 01-Aug-2023: 1 value in 'Pressure' was updated with a new value ('update_data'): changed record 16683 from NaN to 2.130 01-Aug-2023: Q/C flagging criteria applied for column(s) Pressure, 'flags' field updated ('dataflag') 01-Aug-2023: replaced 1 missing value in column Depth with an estimated value based on 1D interpolation of Depth as a function of Date using the MATLAB 9.5 function 'interp1' with the 'pchip' (piecewise cubic Hermite interpolation) method option, excluding data gaps with more than 12 consecutive missing values, and flagging the estimated values as 'E' ('interp_missing') 01-Aug-2023: 1 value in 'Depth' was updated with a new value ('update_data'): changed record 16683 from NaN to 2.115 01-Aug-2023: Q/C flagging criteria applied for column(s) Depth, 'flags' field updated ('dataflag') 01-Aug-2023: replaced 1 missing value in column Salinity with an estimated value based on 1D interpolation of Salinity as a function of Date using the MATLAB 9.5 function 'interp1' with the 'pchip' (piecewise cubic Hermite interpolation) method option, excluding data gaps with more than 12 consecutive missing values, and flagging the estimated values as 'E' ('interp_missing') 01-Aug-2023: 1 value in 'Salinity' was updated with a new value ('update_data'): changed record 16683 from NaN to 28.781 01-Aug-2023: Q/C flagging criteria applied for column(s) Salinity, 'flags' field updated ('dataflag') 01-Aug-2023: replaced 1 missing value in column Sigma_t with an estimated value based on 1D interpolation of Sigma_t as a function of Date using the MATLAB 9.5 function 'interp1' with the 'pchip' (piecewise cubic Hermite interpolation) method option, excluding data gaps with more than 12 consecutive missing values, and flagging the estimated values as 'E' ('interp_missing') 01-Aug-2023: 1 value in 'Sigma_t' was updated with a new value ('update_data'): changed record 16683 from NaN to 20.831 01-Aug-2023: Q/C flagging criteria applied for column(s) Sigma_t, 'flags' field updated ('dataflag') 01-Aug-2023: manually edited data set metadata ('ui_editmetadata') 01-Aug-2023: documented flagged values in columns Temperature, Conductivity, Pressure, Depth, Salinity and Sigma_t as data set anomalies in the metadata ('add_anomalies') 03-Mar-2024: updated 1 metadata fields in the Dataset section(s) ('addmeta') 03-Mar-2024: imported Dataset, Project, Site, Study, Status, Supplement metadata descriptors from the GCE Metabase ('imp_gcemetadata') 03-Mar-2024: updated 57 metadata fields in the Dataset, Project, Site, Status, Study, Supplement section(s) ('addmeta') 03-Mar-2024: converted dates in column(s) Date to format yyyy-mm-dd HH:MM:SS 03-Mar-2024: flags for columns Temperature, Conductivity, Pressure, Depth, Salinity and Sigma_t converted to data columns, flag codes updated in metadata ('flags2cols') 03-Mar-2024: updated 6 metadata fields in the Data section(s) ('addmeta') 03-Mar-2024: updated 15 metadata fields in the Status, Data sections to reflect attribute metadata ('updatecols') 03-Mar-2024: parsed and formatted metadata ('listmeta') B. Variable Information 1. Variable Name: column 1. Site column 2. Station column 3. Longitude column 4. Latitude column 5. Instrument column 6. Date column 7. Year column 8. Month column 9. Day column 10. Hour column 11. Minute column 12. Temperature column 13. Flag_Temperature column 14. Conductivity column 15. Flag_Conductivity column 16. Pressure column 17. Flag_Pressure column 18. Depth column 19. Flag_Depth column 20. Salinity column 21. Flag_Salinity column 22. Sigma_t column 23. Flag_Sigma_t column 24. Calibration 2. Variable Definition: column 1. Nearest nominal GCE-LTER sampling site column 2. Station determined by geographic database lookup of coordinates in columns Latitude and Longitude using a distance tolerance of 0.5km from registered station location column 3. Geographic longitude in decimal degrees column 4. Geographic latitude in decimal degrees column 5. Serial number of the SBE 37-SM MicroCAT instrument used for the observations column 6. Calendar date and time of observation column 7. Calendar year column 8. Calendar month column 9. Calendar day column 10. Hours - GMT column 11. Minutes column 12. Water temperature column 13. QA/QC flags for Water temperature (flagging criteria, where "x" is Temperature: x<0="Q", x>35="Q", Depth<=0="I", Depth<0.15="Q", flag_valuechange(x,2,2,1,3)="Q", manual) column 14. Conductivity column 15. QA/QC flags for Conductivity (flagging criteria, where "x" is Conductivity: x<0="I", Depth<=0="I", Depth<0.15="Q", flag_valuechange(x,0.75,0.75,1,3)="Q", manual) column 16. Water pressure at sensor (approximately equivalent to water depth within 3% error) column 17. QA/QC flags for Water pressure at sensor (approximately equivalent to water depth within 3% error) (flagging criteria, where "x" is Pressure: x<0="I", x<0.05="X", x>10="Q", manual) column 18. Water depth to the pressure sensor of the moored sonde column 19. QA/QC flags for Water depth to the pressure sensor of the moored sonde (flagging criteria, where "x" is Depth: x<0="I", x<0.05="X", x>10="Q", manual) column 20. Salinity column 21. QA/QC flags for Salinity (flagging criteria, where "x" is Salinity: x<0="I", Depth<=0="I", x>38="Q", Depth<0.15="Q", flag_valuechange(x,6,6,1,3)="Q", manual) column 22. Sigma-t (i.e. Density-1) column 23. QA/QC flags for Sigma-t (i.e. Density-1) (flagging criteria, where "x" is Sigma_t: Depth<=0="I", Depth<0.15="Q", flag_valuechange(x,5,5,1,3)="Q", x<-5="Q", x>28="Q", manual) column 24. Boolean value indicating whether data represents a calibration check (0 = false, 1 = true) 3. Units of Measurement: column 1. none column 2. none column 3. degrees column 4. degrees column 5. none column 6. yyyy-mm-dd HH:MM:SS - GMT column 7. YYYY column 8. MM column 9. DD column 10. hr column 11. min column 12. °C column 13. none column 14. S/m column 15. none column 16. dbar column 17. none column 18. m column 19. none column 20. PSU column 21. none column 22. kg/m^3 column 23. none column 24. none 4. Data Type a. Storage Type: column 1. integer column 2. string column 3. floating-point column 4. floating-point column 5. integer column 6. string column 7. integer column 8. integer column 9. integer column 10. integer column 11. integer 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. integer b. Variable Codes: Flag_Temperature: E = data value estimated by interpolation Flag_Conductivity: E = data value estimated by interpolation, Q = questionable value Flag_Pressure: E = data value estimated by interpolation Flag_Depth: E = data value estimated by interpolation Flag_Salinity: E = data value estimated by interpolation, Q = questionable value Flag_Sigma_t: E = data value estimated by interpolation, Q = questionable value c. Numeric Range: column 1. 6 to 6 column 2. (none) column 3. -81.3049 to -81.3049 column 4. 31.3935 to 31.3935 column 5. 4961 to 24060 column 6. (none) column 7. 2022 to 2022 column 8. 1 to 12 column 9. 1 to 31 column 10. 0 to 23 column 11. 0 to 30 column 12. 7.9708 to 31.4529 column 13. (none) column 14. 1.5493 to 5.6249 column 15. (none) column 16. 0.505 to 4.195 column 17. (none) column 18. 0.50151 to 4.1659 column 19. (none) column 20. 9.9425 to 44.3134 column 21. (none) column 22. 5.5864 to 33.8383 column 23. (none) column 24. 0 to 0 d. Missing Value Code: 5. Data Format a. Column Type: column 1. numerical column 2. text column 3. numerical column 4. numerical column 5. numerical column 6. text column 7. numerical column 8. numerical column 9. numerical column 10. numerical column 11. numerical 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 b. Number of Columns: 24 c. Decimal Places: column 1. 0 column 2. 0 column 3. 6 column 4. 6 column 5. 0 column 6. 0 column 7. 0 column 8. 0 column 9. 0 column 10. 0 column 11. 0 column 12. 3 column 13. 0 column 14. 3 column 15. 0 column 16. 3 column 17. 0 column 18. 3 column 19. 0 column 20. 3 column 21. 0 column 22. 3 column 23. 0 column 24. 0 6. Logical Variable Type: column 1. nominal (discrete) column 2. nominal (none) column 3. geographic coordinate (continuous) column 4. geographic coordinate (continuous) column 5. nominal (discrete) column 6. datetime (none) column 7. datetime (discrete) column 8. datetime (discrete) column 9. datetime (discrete) column 10. datetime (discrete) column 11. datetime (discrete) column 12. data (continuous) column 13. coded value (none) column 14. data (continuous) column 15. coded value (none) column 16. data (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. logical (discrete) 7. Flagging Criteria: column 1. none column 2. flag_locationcoords(x,col_Longitude,col_Latitude,0.25,"sensitive","geo_locations.mat")=" Q" column 3. x<-180="Q";x>180="Q" column 4. x<-90="Q";x>90="Q" column 5. none column 6. none column 7. none column 8. x<1="I";x>12="I" column 9. x<1="I";x>31="I" column 10. x<0="I";x>24="I" column 11. x<0="I";x>60="I" column 12. x<0="Q";x>35="Q";col_Depth<=0="I";col_Depth<0.15="Q";flag_valuechange(x,2,2,1,3)="Q";man ually-assigned flags column 13. none column 14. x<0="I";col_Depth<=0="I";col_Depth<0.15="Q";flag_valuechange(x,0.75,0.75,1,3)="Q";manual ly-assigned flags column 15. none column 16. x<0="I";x<0.05="X";x>10="Q";manually-assigned flags column 17. none column 18. x<0="I";x<0.05="X";x>10="Q";manually-assigned flags column 19. none column 20. x<0="I";col_Depth<=0="I";x>38="Q";col_Depth<0.15="Q";flag_valuechange(x,6,6,1,3)="Q";man ually-assigned flags column 21. none column 22. col_Depth<=0="I";col_Depth<0.15="Q";flag_valuechange(x,5,5,1,3)="Q";x<-5="Q";x>28="Q";ma nually-assigned flags column 23. none column 24. x<0="I";x>1="I" C. Data Anomalies: Values of 2 records in Temperature were flagged as E (data value estimated by interpolation) for dates: 06/21/2022, 12/14/2022. Values of 2 records in Conductivity were flagged as E (data value estimated by interpolation) for dates: 06/21/2022, 12/14/2022. Values of 480 records in Conductivity were flagged as Q (questionable value) for dates: 03/14/2022, 04/07/2022, 04/22/2022, 04/23/2022, 04/24/2022, 08/14/2022-08/24/2022. Values of 2 records in Pressure were flagged as E (data value estimated by interpolation) for dates: 06/21/2022, 12/14/2022. Values of 2 records in Depth were flagged as E (data value estimated by interpolation) for dates: 06/21/2022, 12/14/2022. Values of 2 records in Salinity were flagged as E (data value estimated by interpolation) for dates: 06/21/2022, 12/14/2022. Values of 1190 records in Salinity were flagged as Q (questionable value) for dates: 02/11/2022, 02/11/2022-02/12/2022, 02/12/2022-02/13/2022, 02/13/2022-02/14/2022, 02/14/2022-02/15/2022, 02/15/2022-02/16/2022, 02/16/2022-02/17/2022, 02/17/2022-02/18/2022, 02/19/2022, 02/20/2022, 02/21/2022, 02/22/2022, 02/23/2022, 02/24/2022, 02/25/2022, 02/26/2022, 02/27/2022, 02/27/2022-02/28/2022, 02/28/2022-03/01/2022, 03/01/2022-03/02/2022, 03/02/2022-03/03/2022, 03/04/2022, 03/05/2022, 03/06/2022, 03/07/2022, 03/08/2022, 03/09/2022, 03/10/2022, 03/11/2022, 03/12/2022, 03/13/2022, 03/13/2022-03/14/2022, 04/07/2022, 04/22/2022, 04/23/2022, 04/24/2022, 08/14/2022-08/24/2022. Values of 2 records in Sigma_t were flagged as E (data value estimated by interpolation) for dates: 06/21/2022, 12/14/2022. Values of 1242 records in Sigma_t were flagged as Q (questionable value) for dates: 02/06/2022, 02/11/2022, 02/11/2022-02/12/2022, 02/12/2022-02/17/2022, 02/17/2022-02/18/2022, 02/19/2022, 02/20/2022, 02/21/2022, 02/22/2022, 02/23/2022, 02/24/2022, 02/25/2022, 02/26/2022, 02/27/2022, 02/27/2022-02/28/2022, 02/28/2022-03/01/2022, 03/01/2022-03/02/2022, 03/03/2022, 03/04/2022, 03/05/2022, 03/06/2022, 03/07/2022, 03/08/2022, 03/09/2022, 03/10/2022, 03/11/2022, 03/12/2022, 03/13/2022, 03/13/2022-03/14/2022, 04/23/2022, 04/24/2022, 08/14/2022-08/24/2022. V. Supplemental Descriptors A. Data Acquisition 1. Data Forms: Copies of CTD cast logs and raw data are maintained at the Georgia Coastal Ecosystems Information Management Office 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: Sea-Bird Electronics Sea-Soft version 4.246, MATLAB version 2013B E. Archival Practices: Data sets and documentation are stored in structured binary (Matlab 5.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