I. Data Set Descriptors A. Title: Christopher B. Craft. 2020. Porewater chemistry measurements from the GCE-LTER Seawater Addition Long-Term Experiment (SALTEx) from July 2017 through July 2019.. Georgia Coastal Ecosystems LTER Data Catalog (data set NUT-IRMA-2002; /data/NUT-IRMA-2002) B. Accession Number: NUT-IRMA-2002 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. The SALTEx experiment was initiated in 2012 and consists of 31 field plots, each 2.5 m on a side. There are three treatments (Press, Pulse, and Fresh) and two types of controls (with and without sides), each consisting of six replicates. The Press treatment plots receive regular (4 times each week) additions of a mixture of seawater and fresh river water. Pulse plots receive the same mixture of seawater and river water during September and October, which is historically a time of low flow in the river when natural saltwater intrusion occurs. The Fresh treatment plots receive regular additions of fresh river water. Treatment water is added during low tide to facilitate its infiltration into the soil, and all plots are inundated by astronomical tides at high tide. Response measurements include porewater chemistry, specifically concentrations of chloride, sulfate, sulfide, dissolved organic carbon (DOC), ammonium-N, nitrate/nitrite-N, dissolved reactive phosphorus, total phosphorus, total nitrogen, organic nitrogen, carbon:nitrogen (C:N) ratio, organic-carbon:organic-nitrogen ratio, and pH. Samples of source water were taken after collection (seawater, river water) or mixing (mixed seawater and river water in tanks) and analyzed for concentrations of dissolved reactive phosphorus, total phosphorus, ammonium-N, nitrate/nitrite-N, total nitrogen, organic nitrogen. Source water samples from 2016 and beyond also included measurements of dissolved organic carbon (DOC), carbon:nitrogen ratio, organic-carbon:organic-nitrogen ratio, chloride and sulfate. 3. Study Type: Research Study 4. Study Themes: General Nutrient Chemistry, Chemistry, Pore-water Chemistry 5. LTER Core Areas: Disturbance Patterns, Inorganic Matter, Organic Matter 6. Georeferences: none 7. Submission Date: Feb 11, 2020 D. Keywords: carbon, chloride, disturbance, Disturbance Patterns, GCE, Georgia, Georgia Coastal Ecosystems, Inorganic Matter, inundation, LTER, marshes, nitrogen, nutrients, Organic Matter, ph, phosphorus, porewater, press, pulse, salinity, Sapelo Island, soils, sulfate, USA II. Research Origin Descriptors A. Overall Project Description 1. Project Title: 2017 Hurricane Irma 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, 2017 to Nov 01, 2018 4. Objectives: To evaluate the effects of disturbance along an abiotic salinity gradient by augmenting sampling of eleven core GCE-LTER monitoring sites, evaluate the effects of prior disturbance history by leveraging an ongoing field experiment to determine how prior saline disturbance treatments affect responses to the hurricane storm surge, evaluate state change using aerial imagery to look at landscape level shifts in vegetation type compared to pre-storm maps. 5. Abstract: The Georgia Coastal Ecosystems LTER program is studying how intertidal communities respond to changes in the upstream intrusion of salt water, due to both press (sea level rise) and pulse (droughts, storms) disturbances, and what it takes to tip these communities into a new state (which we define as a habitat shift). Hurricane Irma, which passed over the US on Sept. 11, 2017, caused the highest storm surge ever recorded on the central Georgia coast, and caused salt water to intrude far upstream. The GCE-LTER has long-term experiments and monitoring programs that provide 'before' data and a context for understanding the effects of this event. We hypothesize that the effects of disturbance will vary across abiotic gradients, that the response will depend on a site's prior disturbance history, and that state change is more likely to occur in transitional areas. We will assess these hypotheses as follows: 1) To evaluate the effects of disturbance along an abiotic salinity gradient we will augment sampling of our 11 core monitoring sites. We predict that the greatest response and longest recovery times in upstream areas that rarely experience pulses of high salinity water; 2) To evaluate the effects of prior disturbance history we will leverage an ongoing field experiment to determine how prior saline disturbance treatments affect responses to the hurricane storm surge. We predict that the press plots, which were already strongly affected, will take the longest to recover; that pulse plots may be pushed over a tipping point by the combination of the previous pulse treatment plus the hurricane; and that the control plots will be affected as observed in the pulse treatment before the hurricane; 3) To evaluate state change we will collect aerial imagery that will allow us to look at landscape level shifts in vegetation type compared to pre-storm maps, and augment sampling of transitional plots. We predict that transitional areas will be particularly vulnerable to state change, and that hurricane disturbance will re-set habitat distributions across the landscape. 6. Funding Source: NSF OCE 1803159 B. Sub-project Description 1. Site Description a. Geographic Location: SALTEx -- SALTEx Research Site, Champney Island, Georgia, USA AL+27 -- AL+27 GCE4_Hydro -- Meridian Landing/Hudson Creek hydrographic datalogger deployment 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 AL+27 -- 81 29 08.4 W, 31 21 30.0 N GCE4_Hydro -- 81 21 45.9 W, 31 27 12.8 N b. Physiographic Region: SALTEx -- unspecified AL+27 -- Estuary and tidal marsh GCE4_Hydro -- Estuary and tidal marsh c. Landform Components: SALTEx -- unspecified AL+27 -- Intertidal marsh bordering sounds, tidal channels and creeks GCE4_Hydro -- Intertidal marsh bordering sounds, tidal channels and creeks d. Hydrographic Characteristics: SALTEx -- unspecified AL+27 -- Site encompasses the Altamaha River estuary and nearby tidal creeks, and is subject to 2-3.4m semi-diurnal tides. High freshwater input from the Altamaha River, one of the largest rivers in the Southeastern United States. GCE4_Hydro -- Site encompasses Doboy Sound and nearby tidal channels and creeks, and is subject to 2-3.4m semi-diurnal tides. e. Topographic Attributes: SALTEx -- unspecified AL+27 -- Flat, with elevations ranging from 0-3.4m above mean low tide GCE4_Hydro -- Flat, with elevations ranging from 0-3.4m above mean low tide f. Geology, Lithology and Soils: SALTEx -- unspecified AL+27 -- unspecified GCE4_Hydro -- unspecified g. Vegetation Communities: SALTEx -- Zizaniopsis, Spartina cynosuroides AL+27 -- unspecified GCE4_Hydro -- 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: SALTEx was initiated in 2012 (measurements began in 2014) and consists of 31 field plots, each 2.5 m on a side. There are three treatments (Press, Pulse, and Fresh) and two types of controls (with and without sides), each consisting of six replicates. The replicates are blocked by elevation in statistical analyses. The Press treatment plots receive regular (4 times each week) additions of a mixture of seawater and fresh river water. Pulse plots receive the same mixture of seawater and river water during September and October, which is historically a time of low flow in the river when saltwater intrusion naturally occurs. The Fresh treatment plots receive regular additions of fresh river water. Response measurements include porewater chemistry, specifically concentrations of chloride, sulfate, sulfide, dissolved organic carbon (DOC), ammonium-N, nitrate/nitrite-N, dissolved reactive P, total P, total N, organic N, C:N ratio, org-C:org-N ratio, and pH. We predict that the seawater additions will increase the salinity, chloride, sulfate, and sulfide concentrations in the press plots and temporarily increase the salinity, chloride, sulfate, and sulfide concentrations in the pulse plots during the pulse treatment months. We also expect the changes in porewater salinity to affect the rate of organic matter mineralization and the concentrations of different N and P species in the porewater. b. Permanent Plots: not specified c. Data Collection Duration and Frequency: Two of the four wells in each plot are sampled every 3 months. Porewater from the two wells is combined into a composite sample. The composite sample is divided into 3 125-mL bottles, two of which are sent to the EPA office in Cincinatti for N & P analysis, while the other is taken to Indiana University for analysis of chloride, sulfate, DOC, and sulfides. Samples of source water were taken after collection (seawater, river water) or mixing (mixed seawater and river water in tanks) and analyzed for concentrations of dissolved reactive P, total P, ammonium-N, nitrate/nitrite-N, total N, oraganic N. Source water samples from 2016 and beyond also included measurements of DOC, C:N ratio, org-C:org-N ratio, chloride and sulfate. Beginning of Observations: Jul 10, 2017 End of Observations: Jul 08, 2019 3. Research Methods a. Field and Laboratory Methods: Method 1: Sampling Method -- Water samples are collected according to the "SALTEx Quarterly Porewater Sampling Protocol" . Method 2: Ion Chromatograph Analysis -- Water samples are analyzed for chloride and sulfate. Method 3: Sulfide Analysis -- Water samples are analyzed for sulfide concentration. Method 4: DOC Analysis -- Water samples are analyzed for dissolved organic carbon (DOC) concentration. Method 5: Ammonium (NH4) Wet Chemistry -- Water samples are analyzed for ammonium-N concentration Method 6: Total Nitrogen and Total Dissolved Nitrogen Wet Chemistry -- Water samples are analyzed for nitrate/nitrite, nitrite, and total N concentrations Method 7: Reactive Phosphorus Wet Chemistry -- Water samples are analyzed for dissolved reactive phosphorus (DRP) Method 8: Total Phosphorus and Total Dissolved Phosphorus Wet Chemistry -- Water samples are analyzed for total phosphorus (TP) b. Protocols: Method 1: none Method 2: none Method 3: none Method 4: none Method 5: none Method 6: none Method 7: none Method 8: SALTEx Total Phosphorus and Total Dissolved Phosphorus Wet Chemistry Protocol (ESF-SOP 030) Organization: U.S. EPA Watershed Management Research: Experimental Stream Facility and Associated Field Studies Description: SALTEx protocol for analyzing porewater samples for Total Phosphorus (TP) using the Lachat QuikChem 8500 Flow Injection System. (ESF-SOP 030) URL: http://gce-lter.marsci.uga.edu/public/app/resource_details.asp?id=762&version=1 Author: Christopher B. Craft (email: ccraft@indiana.edu) c. Instrumentation: Method 1: none Method 2: Dionex IC-2000 Method 3: Orion silver sulfide combination electrode, Orion portable meter Method 4: Shimadzu TOC-Vcpn Total Organic Carbon Analyzer Method 5: Lachat QuikChem 8500 Flow Injection Analysis system Method 6: Lachat QuikChem 8500 Flow Injection Analysis system Method 7: Lachat QuikChem 8500 Flow Injection Analysis system Method 8: Lachat QuikChem 8500 Flow Injection Analysis system 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 Method 7: not applicable Method 8: not applicable e. Speclies List: f. Permit History: Method 1: Army Corps of Engineers Permit SAS-2011-00748, Georgia DNR Coastal Resources Division Letter of Permission issued on Aug. 9 2011 (File 072911.0000_) Method 2: not applicable Method 3: not applicable Method 4: not applicable Method 5: not applicable Method 6: not applicable Method 7: not applicable Method 8: not applicable 4. Project Personnel a. Personnel: 1: Christopher B. Craft 2: Sarah Widney 3: Dontrece Smith 4: Joseph P. Schubauer-Berigan 5: Ellen Herbert 6: Elena Solohin 7: Jennifer Desha b. Affiliations: 1: Indiana University at Bloomington, Bloomington, Indiana 2: Indiana University, Bloomington, Indiana 3: University of Georgia Marine Institute, Sapelo Island, Georgia 4: University of Cincinnati, Cincinnati, Ohio 5: Ducks Unlimited, Memphis, Tennessee 6: Indiana University, Bloomington, Indiana 7: University of Georgia Marine Institute, Sapelo Island, GA III. Data Set Status and Accessibility A. Status 1. Latest Update: 14-Nov-2024 2. Latest Archive Date: 11-Feb-2020 3. Latest Metadata Update: 14-Nov-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: Wade M. Sheldon, Jr. Address: 130 Marine Sciences Marine Sciences Building Athens, Georgia 30602-3636 Country: USA Email: sheldon@uga.edu 3. Copyright Restrictions: not copyrighted 4. Restrictions: All publications based on this data set must cite the contributor and NSF grant number a. Release Date: Affiliates: Feb 11, 2020, Public: Jul 01, 2021 b. Citation: Data provided by the Georgia Coastal Ecosystems Long Term Ecological Research Project, supported by funds from NSF OCE 1803159 (data set NUT-IRMA-2002) 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: NUT-IRMA-2002_SALTEx_1_0.CSV 2. Size: 279 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: 6. Quality Control Flag Codes: Q = questionable value, I = invalid value, E = estimated value 7. Authentication Procedures: 8. Calculations: Organic_Nitrogen: ON=TN-(NH4+NO2-3) Carbon_to_Nitrogen_Ratio: (DOC/12.01)/(TN/14.01) Organic_Carbon_to_Organic_Nitrogen_Ratio: (DOC/12.01)/(ON/14.01) 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: NUT-GCES-1608.txt (496 records) SaltexNutsUpdate.txt (299 records) Data processing history: 02-Feb-2018: new GCE Data Structure 1.1 created ('newstruct') 02-Feb-2018: 496 rows imported from ASCII data file 'NUT-GCES-1608.txt' ('imp_ascii') 02-Feb-2018: 83 metadata fields in file header parsed ('parse_header') 02-Feb-2018: data structure validated ('gce_valid') 02-Feb-2018: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 02-Feb-2018: automatically assigned study date metadata descriptors based on the range of date values in date/time columns (add_studydates) 02-Feb-2018: copied/reordered columns Year, Month, Day, Date, Treatment, Replicate, Elevation, Dissolved_Reactive_Phosphorus, Total_Phosphorus, Ammonium, Nitrate_Nitrite, Nitrite, Total_Nitrogen, Organic_Nitrogen, Dissolved_Organic_Carbon, Carbon_to_Nitrogen_Ratio, Organic_Carbon_to_Organic_Nitrogen_Ratio, Sulfides, Chloride, Sulfate and pH ('copycols') 02-Feb-2018: manually edited QA/QC flags for column(s) Dissolved_Reactive_Phosphorus and reset criteria to prevent automatic recalculation ('ui_manual_qc') 02-Feb-2018: replaced 'A' flags in column(s) Dissolved_Reactive_Phosphorus with 'Q' flags, performing a full case-sensitive match ('string_replace') 02-Feb-2018: manually edited data set metadata ('ui_editmetadata') 02-Feb-2018: query 'Replicate~=0 OR ~strcmp(Treatment,'Tank')' run, returned 496 of 496 data rows ('querydata') 02-Feb-2018: query 'Replicate~=0 & ~strcmp(Treatment,'Tank')' run, returned 458 of 496 data rows ('querydata') 06-Feb-2020: 299 rows added at the bottom of the data set from '' ('datamerge') 06-Feb-2020: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 06-Feb-2020: automatically assigned study date metadata descriptors based on the range of date values in date/time columns (add_studydates) 06-Feb-2020: Q/C Criteria of column Year changed from 'x<2014='Q';x>2017='Q'' to 'x<2014='Q';x>2019='Q' ('ui_editor') 06-Feb-2020: Q/C flagging criteria applied for column(s) Year, 'flags' field updated ('dataflag') 06-Feb-2020: manually edited QA/QC flags for column(s) Ammonium, Dissolved_Organic_Carbon, Dissolved_Reactive_Phosphorus, Nitrate_Nitrite, Total_Nitrogen and Total_Phosphorus and reset criteria to prevent automatic recalculation ('ui_manual_qc') 06-Feb-2020: updated 1 metadata fields in the Dataset sections ('addmeta') 06-Feb-2020: imported Dataset, Project, Site, Study, Status, Supplement metadata descriptors from the GCE Metabase ('imp_gcemetadata') 06-Feb-2020: updated 56 metadata fields in the Dataset, Project, Site, Status, Study, Supplement sections ('addmeta') 06-Feb-2020: query 'strcmp(Treatment,'C') strcmp(Treatment,'CS') strcmp(Treatment,'F') strcmp(Treatment,'PR') strcmp(Treatment,'PU')' run, returned 737 of 757 data rows ('querydata') 06-Feb-2020: automatically assigned study date metadata descriptors based on the range of date values in date/time columns (add_studydates) 11-Feb-2020: query 'Year>=2017' run, returned 341 of 737 data rows ('querydata') 11-Feb-2020: automatically assigned study date metadata descriptors based on the range of date values in date/time columns (add_studydates) 11-Feb-2020: edited structure data ('ui_datagrid'): deleted record(s) 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61 and 62 11-Feb-2020: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 11-Feb-2020: updated 1 metadata fields in the Dataset sections ('addmeta') 11-Feb-2020: imported Dataset, Project, Site, Study, Status, Supplement metadata descriptors from the GCE Metabase ('imp_gcemetadata') 11-Feb-2020: updated 57 metadata fields in the Dataset, Project, Site, Status, Study, Supplement sections ('addmeta') 14-Nov-2024: flags for columns Dissolved_Reactive_Phosphorus, Total_Phosphorus, Ammonium, Nitrate_Nitrite, Total_Nitrogen, Organic_Nitrogen, Dissolved_Organic_Carbon, Carbon_to_Nitrogen_Ratio and Organic_Carbon_to_Organic_Nitrogen_Ratio converted to data columns, flag codes updated in metadata ('flags2cols') 14-Nov-2024: updated 6 metadata fields in the Data section(s) ('addmeta') 14-Nov-2024: updated 15 metadata fields in the Status, Data sections to reflect attribute metadata ('updatecols') 14-Nov-2024: parsed and formatted metadata ('listmeta') B. Variable Information 1. Variable Name: column 1. Year column 2. Month column 3. Day column 4. Date column 5. Treatment column 6. Replicate column 7. Elevation column 8. Dissolved_Reactive_Phosphorus column 9. Flag_Dissolved_Reactive_Phosphorus column 10. Total_Phosphorus column 11. Flag_Total_Phosphorus column 12. Ammonium column 13. Flag_Ammonium column 14. Nitrate_Nitrite column 15. Flag_Nitrate_Nitrite column 16. Nitrite column 17. Total_Nitrogen column 18. Flag_Total_Nitrogen column 19. Organic_Nitrogen column 20. Flag_Organic_Nitrogen column 21. Dissolved_Organic_Carbon column 22. Flag_Dissolved_Organic_Carbon column 23. Carbon_to_Nitrogen_Ratio column 24. Flag_Carbon_to_Nitrogen_Ratio column 25. Organic_Carbon_to_Organic_Nitrogen_Ratio column 26. Flag_Organic_Carbon_to_Organic_Nitrogen_Ratio column 27. Sulfides column 28. Chloride column 29. Sulfate column 30. pH 2. Variable Definition: column 1. Year the sample was collected column 2. Month the sample was collected column 3. Day the sample was collected column 4. Date the sample was collected column 5. Sample treatment column 6. Replicate column 7. Mean plot elevation relative to MLW column 8. Dissolved reactive phosphorus (DRP) as ug-P/L column 9. QA/QC flags for Dissolved reactive phosphorus (DRP) as ug-P/L (flagging criteria, where "x" is Dissolved_Reactive_Phosphorus: x<0="I", x<0="Q", x>1000="Q", manual) column 10. Total phosphorus (TP) as ug-P/L column 11. QA/QC flags for Total phosphorus (TP) as ug-P/L (flagging criteria, where "x" is Total_Phosphorus: x<0="I", x<0="Q", x>1000="Q", manual) column 12. Ammonium-N (NH4) as ug-N/L column 13. QA/QC flags for Ammonium-N (NH4) as ug-N/L (flagging criteria, where "x" is Ammonium: x<0="I", x<0="Q", x>5000="Q", manual) column 14. Nitrate & nitrite (NO3 & NO2) as ug-N/L column 15. QA/QC flags for Nitrate & nitrite (NO3 & NO2) as ug-N/L (flagging criteria, where "x" is Nitrate_Nitrite: x<0="I", x<0="Q", x>300="Q", manual) column 16. Nitrite (NO2) as ug-N/L column 17. Total nitrogen as ug-N/L column 18. QA/QC flags for Total nitrogen as ug-N/L (flagging criteria, where "x" is Total_Nitrogen: x<0="I", x<0="Q", x>7500="Q", manual) column 19. Organic nitrogen as ug-N/L column 20. QA/QC flags for Organic nitrogen as ug-N/L (flagging criteria, where "x" is Organic_Nitrogen: x<0="I", x<0="Q", x>5000="Q") column 21. Dissolved organic carbon (DOC) as ug-C/L column 22. QA/QC flags for Dissolved organic carbon (DOC) as ug-C/L (flagging criteria, where "x" is Dissolved_Organic_Carbon: x<0="I", x<0="Q", x>30000="Q", manual) column 23. Carbon to nitrogen (CN) ratio (mol:mol) column 24. QA/QC flags for Carbon to nitrogen (CN) ratio (mol:mol) (flagging criteria, where "x" is Carbon_to_Nitrogen_Ratio: x<0="I", x<0="Q", x>100="Q") column 25. Organic carbon to organic nitrogen (OCON) ratio (mol:mol) column 26. QA/QC flags for Organic carbon to organic nitrogen (OCON) ratio (mol:mol) (flagging criteria, where "x" is Organic_Carbon_to_Organic_Nitrogen_Ratio: x<0="I", x<0="Q", x>100="Q") column 27. Concentration of hydrogen sulfide as ug-S/L column 28. Chloride concentration column 29. Sulfate concentration column 30. porewater pH 3. Units of Measurement: column 1. YYYY column 2. MM column 3. DD column 4. yyyy-mm-dd column 5. none column 6. none column 7. m column 8. ug/L column 9. none column 10. ug/L column 11. none column 12. ug/L column 13. none column 14. ug/L column 15. none column 16. ug/L column 17. ug/L column 18. none column 19. ug/L column 20. none column 21. ug/L column 22. none column 23. none column 24. none column 25. none column 26. none column 27. ug/L column 28. mg/L column 29. mg/L column 30. none 4. Data Type a. Storage Type: column 1. integer column 2. integer column 3. integer column 4. string column 5. string column 6. integer column 7. floating-point column 8. floating-point column 9. string 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. floating-point column 18. string column 19. floating-point column 20. string column 21. floating-point column 22. string column 23. floating-point column 24. string column 25. floating-point column 26. string column 27. floating-point column 28. floating-point column 29. floating-point column 30. floating-point b. Variable Codes: Treatment: C=Control, CS=Control w/ sides, F=Fresh, PR=Press, PU=Pulse, AltRvr=Altamaha River, Tank=Mixing tank, MerDock=Meridian Dock MFlag_Nitrate_Nitrite: Q = questionable value MFlag_Sulfate: Q = questionable value MFlag_Dissolved_Reactive_Phosphorus: Q = questionable value MFlag_Organic_Nitrogen: I = invalid value, Q = questionable value MFlag_Dissolved_Organic_Carbon: Q = questionable value MFlag_Carbon_to_Nitrogen_Ratio: Q = questionable value MFlag_Organic_Carbon_to_Organic_Nitrogen_Ratio: I = invalid value, Q = questionable value MFlag_Sulfate: Q = questionable value Flag_Dissolved_Reactive_Phosphorus: Q = questionable value Flag_Total_Phosphorus: Q = questionable value Flag_Ammonium: Q = questionable value Flag_Nitrate_Nitrite: Q = questionable value Flag_Total_Nitrogen: Q = questionable value Flag_Organic_Nitrogen: I = invalid value, Q = questionable value Flag_Dissolved_Organic_Carbon: Q = questionable value Flag_Carbon_to_Nitrogen_Ratio: Q = questionable value Flag_Organic_Carbon_to_Organic_Nitrogen_Ratio: I = invalid value, Q = questionable value c. Numeric Range: column 1. 2017 to 2019 column 2. 1 to 12 column 3. 5 to 18 column 4. (none) column 5. (none) column 6. 1 to 9 column 7. 1.3417 to 1.495 column 8. 1.99 to 353 column 9. (none) column 10. 26.1 to 678 column 11. (none) column 12. 0.45 to 798 column 13. (none) column 14. 0.0225 to 236 column 15. (none) column 16. (none) column 17. 5.635 to 1580 column 18. (none) column 19. -9.825 to 1273.96 column 20. (none) column 21. 753.1 to 32570 column 22. (none) column 23. 1.3684 to 2914.7671 column 24. (none) column 25. -1671.7265 to 139.3642 column 26. (none) column 27. 21.1502 to 8195.7184 column 28. 7.446 to 1275.7 column 29. 0 to 118.19 column 30. (none) d. Missing Value Code: 5. Data Format a. Column Type: column 1. numerical column 2. numerical column 3. numerical column 4. text column 5. text column 6. numerical column 7. numerical column 8. numerical column 9. text column 10. numerical column 11. text column 12. numerical column 13. text column 14. numerical column 15. text column 16. numerical column 17. numerical column 18. text column 19. numerical column 20. text column 21. numerical column 22. text column 23. numerical column 24. text column 25. numerical column 26. text column 27. numerical column 28. numerical column 29. numerical column 30. numerical b. Number of Columns: 30 c. Decimal Places: column 1. 0 column 2. 0 column 3. 0 column 4. 0 column 5. 0 column 6. 0 column 7. 5 column 8. 1 column 9. 0 column 10. 1 column 11. 0 column 12. 1 column 13. 0 column 14. 1 column 15. 0 column 16. 1 column 17. 1 column 18. 0 column 19. 1 column 20. 0 column 21. 0 column 22. 0 column 23. 2 column 24. 0 column 25. 2 column 26. 0 column 27. 0 column 28. 2 column 29. 2 column 30. 2 6. Logical Variable Type: column 1. datetime (discrete) column 2. datetime (discrete) column 3. datetime (discrete) column 4. datetime (none) column 5. coded value (none) column 6. ordinal (discrete) column 7. data (continuous) column 8. data (continuous) column 9. coded value (none) column 10. data (continuous) column 11. coded value (none) column 12. data (continuous) column 13. coded value (none) column 14. data (continuous) column 15. coded value (none) column 16. data (continuous) column 17. data (continuous) column 18. coded value (none) column 19. calculation (continuous) column 20. coded value (none) column 21. data (continuous) column 22. coded value (none) column 23. calculation (continuous) column 24. coded value (none) column 25. calculation (continuous) column 26. coded value (none) column 27. data (continuous) column 28. data (continuous) column 29. data (continuous) column 30. data (continuous) 7. Flagging Criteria: column 1. x<2014="Q";x>2019="Q" column 2. x<1="I";x>12="I";x<1="Q";x>12="Q" column 3. x<1="I";x>31="I";x<1="Q";x>31="Q" column 4. none column 5. none column 6. x<0="Q";x>9="Q" column 7. x<0="Q";x>2="Q" column 8. x<0="I";x<0="Q";x>1000="Q";manually-assigned flags column 9. none column 10. x<0="I";x<0="Q";x>1000="Q";manually-assigned flags column 11. none column 12. x<0="I";x<0="Q";x>5000="Q";manually-assigned flags column 13. none column 14. x<0="I";x<0="Q";x>300="Q";manually-assigned flags column 15. none column 16. x<0="I";x<0="Q";x>300="Q" column 17. x<0="I";x<0="Q";x>7500="Q";manually-assigned flags column 18. none column 19. x<0="I";x<0="Q";x>5000="Q" column 20. none column 21. x<0="I";x<0="Q";x>30000="Q";manually-assigned flags column 22. none column 23. x<0="I";x<0="Q";x>100="Q" column 24. none column 25. x<0="I";x<0="Q";x>100="Q" column 26. none column 27. x<0="I";x<0="Q";x>75000="Q" column 28. x<0="I";x<0="Q";x>50000="Q" column 29. x<0="I";x<0="Q";x>5000="Q" column 30. x<1="I";x>14="I";x<4="Q";x>8="Q" C. Data Anomalies: Sulfide data were not collected prior to October 2014; pH data were not collected prior to July 2016; nitrite measurements were ceased after January 2014. Dissolved_Reactive_Phosphorus (DRP) values from the following stations were flagged as "Q" due to low recovery of spike: 7/11/2016 (C1, CS2, F2, PU1), 10/24/2016 (C1, CS4, F7, PU2), and 1/6/2017 (C2, CS5, F2). V. Supplemental Descriptors A. Data Acquisition 1. Data Forms: Excel spreadsheets 2. Form Location: secure server at Indiana University 3. Data Entry Validation: n/a B. Quality Assurance/Quality Control Procedures: C. Supplemental Materials: n/a D. Computer Programs: Microsoft Excel 2007 E. Archival Practices: 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