I. Data Set Descriptors A. Title: Merryl Alber. 2019. Long-term water quality monitoring in the Altamaha River near Doctortown, Georgia from January 2013 to December 2022.. Georgia Coastal Ecosystems LTER Data Catalog (data set NUT-GCEM-1909; /data/NUT-GCEM-1909) B. Accession Number: NUT-GCEM-1909 C. Description 1. Originator(s): Name: Merryl Alber Address: Dept. of Marine Sciences University of Georgia Athens, Georgia 30602-3636 Country: USA Email: malber@uga.edu 2. Abstract: Water samples were collected monthly on the Atlamaha River near Doctortown, Georgia. The samples were anlayzed for dissolved organics (carbon, nitrogen, phosphorus), dissolved nutrients (ammonium, nitrite, nitrate, phosphate, silicate) and particulate carbon and nitrogen. Concentrations of the following were measured using standard analytical methods: dissolved nutrients (phosphate, nitrate+nitrite, ammonium, silicate), dissolved organics (carbon, nitrogen, phosphorus) and particulate carbon and nitrogen 3. Study Type: Monitoring 4. Study Themes: General Nutrient Chemistry, Chemistry, Organic Matter/Decomposition, Phytoplankton Productivity 5. LTER Core Areas: Inorganic Matter, Organic Matter 6. Georeferences: none 7. Submission Date: Aug 20, 2019 D. Keywords: Altamaha River, ammonia, carbon to nitrogen ratio, dissolved nutrients, dissolved organic carbon, estuaries, GCE, Georgia, Georgia Coastal Ecosystems, Inorganic Matter, LTER, nitrate, nitrite, Organic Matter, phosphate, Sapelo Island, total nitrogen, USA, 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: ALT-BASIN -- Altamaha River basin, Georgia, USA AltamahaWC1 -- Altamaha River water quality sampling station Coordinates: ALT-BASIN -- NW: 084 26 18.00 W, 34 23 07.98 N NE: 081 30 21.87 W, 34 23 07.98 N SE: 081 30 21.87 W, 31 18 56.03 N SW: 084 26 18.00 W, 31 18 56.03 N AltamahaWC1 -- 81 50 40.2 W, 31 40 01.6 N b. Physiographic Region: ALT-BASIN -- unspecified AltamahaWC1 -- unspecified c. Landform Components: ALT-BASIN -- unspecified AltamahaWC1 -- unspecified d. Hydrographic Characteristics: ALT-BASIN -- unspecified AltamahaWC1 -- unspecified e. Topographic Attributes: ALT-BASIN -- unspecified AltamahaWC1 -- unspecified f. Geology, Lithology and Soils: ALT-BASIN -- unspecified AltamahaWC1 -- unspecified g. Vegetation Communities: ALT-BASIN -- Juncus spp. and various freshwater riparian vegetation AltamahaWC1 -- Juncus spp. and various freshwater riparian vegetation 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: not specified b. Permanent Plots: none c. Data Collection Duration and Frequency: not specified Beginning of Observations: Jan 01, 2013 End of Observations: May 31, 2022 3. Research Methods a. Field and Laboratory Methods: Method 1: PC/PN Filitration -- Using 3 pre-combusted 25 mm GF/F filters in glass towers in manifold, a know volume of water was filtered through each and water voulume was recorded. Just as filter runs dry, the side of the filter tower was rinced with 5 ml aliquot of filtered sample water (from nutrient filtration). Filters were placed back into labeled covered petri dishes. Within 2 hours,petri dishes were placed into 60 °C drying oven, with covers off, for at least 12 hours. After 12 hours, petri dishes were removed and tops were returned and sealed tightly. Method 2: Phosphate Measurement -- This method covers the determination of the orthophosphate ion in drinking, surface and saline waters, domestic and industrial wastes using APHA Standard Method 4500-P F. Ammonium molybdate and antimony potassium tartrate react in an acid medium with dilute solutions of phosphorus to form an antimony-phospho-molybdate complex. This complex is reduced to an intensely blue-colored complex by ascorbic acid. The color is proportional to the phosphorus concentration. Only orthophosphate forms a blue color in this test. Polyphosphates (and some organic phosphorus compounds) may be converted to the orthophosphate form by manual sulfuric acid hydrolysis. Organic phosphorus compounds may be converted to the orthophosphate form by manual persulfate digestion. The developed color is measured automatically on the AutoAnalyzer. Method 3: Silicate Filtration -- Using an all-plastic filtrations set-up and hand pump, approximately 25 ml of water was filtered through 47 mm 0.6µm Poretics fliter. The filtrate was dispensed into acid-washed plastic scintillation vial, and was stored refrigerated upright. Method 4: Total N and Total P Measurement -- This digest is applied to water samples to oxidize the nitrogen from all N compartments into nitrate and the phosphorus from all P compartments into orthophosphate. The resulting digests are analyzed by automated colorimetry (Alpkem or Technicon) for nitrate-N and orthophosphate-P. It is based on the method of Koroleff 1983.as modified by Qualls 1989. Koroleff, F. 1983. Simultaneous oxidation of nitrogen and phosphorus compounds by persulfate. P.168-169. In K. Grasshoff, M. Eberhardt, and K. Kremling, eds., Methods of Seawater Analysis. 2nd ed., Verlag Chemie, Weinheimer, FRG. Qualls, R. G. 1989. Determination of total nitrogen and phosphorus in water using persulfate oxidation: a modification for small sample volumes using the method of Koroleff (1983). Appendix A pp. 131-138. In The biogeochemical properties of dissolved organic matter in a hardwood forest ecosystem: their influence on the retention of nitrogen, phosphorus, and carbon. Ph.D. dissertation, University of Georgia Institute of Ecology, Athens, Georgia, USA. University Microfilms, Inc., no. DEX9003448 Method 5: Ammonium Measurement -- This method covers the determination of ammonia in drinking, surface, and saline waters, domestic and industrial wastes using APHA Standard Method 4500-NH3 G. Alkaline phenol and hypochlorite react with ammonia to form indophenol blue that is proportional to the ammonia concentration. The blue color formed is intensified with sodium nitroprusside. Samples can be preserved by addition of 2 ml conc. H2SO4 per liter and refrigeration at 4 degrees C. Method 6: Dissolved Nutrient Filtration -- Approximately 200 ml of water was filtered through a pre-combusted 47 mm GF/F filter and filtrate was collected in a clean flask. The filtrate was dispensed into a series of acid-washed plastic scintillation vials (each labeled (color-coded) to show which dissolved nutrient will be measured from that aliquot) and frozen upright. Method 7: Nitrate Nitrite Measurement -- This method pertains to the determination of nitrite singly, or nitrite and nitrate combined in surface and saline waters, and domestic and industrial wastes using APHA Standard Method 4500-NO3 F. The applicable range of this method is 0.05 to 10.0 mg/l nitrate-nitrite nitrogen. The range may be extended with sample dilution. A filtered sample is passed through a column containing granulated copper-cadmium to reduce nitrate to nitrite. The nitrite (that originally present plus reduced nitrate) is determined by diazotizing with sulfanilamide and coupling with N-(1-naphthyl)-ethylenediamine dihydrochloride to form a highly colored azo dye which is measured colorimetrically. Separate, rather than combined nitrate-nitrite, values are readily obtained by carrying out the procedure first with, and then without, the Cu-Cd reduction step. b. Protocols: Method 1: none Method 2: SIEL Protocol for colorimetric analysis of phosphate Organization: UGA Stable Isotope Ecology Laboratory Description: SIEL protocol for colorimetric analysis of phosphate from EPA Method 365.1 URL: http://gce-lter.marsci.uga.edu/public/app/resource_details.asp?id=837 Method 3: none Method 4: Persulfate Digest for Water Total Nitrogen and Total Phosphorous Organization: UGA Stable Isotope Ecology Laboratory Description: This digest is applied to water samples to oxidize the nitrogen from all N compartments into nitrate and the phosphorus from all P compartments into orthophosphate. The resulting digests are analyzed by automated colorimetry (Alpkem or Technicon) for nitrate-N and orthophosphate-P. It is both safer and more effective than traditional Kjeldahl techniques. It is based on the method of Koroleff 1983 as modified by Qualls 1989. URL: http://gce-lter.marsci.uga.edu/public/app/resource_details.asp?id=838 Method 5: SIEL Protocol for colorimetric analysis of ammonium Organization: UGA Stable Isotope Ecology Laboratory Description: SIEL protocol for colorimetric analysis of ammonium from EPA Method 350.1 URL: http://gce-lter.marsci.uga.edu/public/app/resource_details.asp?id=836 Method 6: none Method 7: SIEL protocol for colorimetric analysis of Nitrate-Nitrite Nitrogen from EPA Method 353.2 Organization: UGA Stable Isotope Ecology Laboratory Description: This method covers the determination of nitrite singly, or nitrite and nitrate combined in drinking, ground, surface, domestic and industrial wastes. The applicable range is 0.05-10.0 mg/L nitrate-nitrite nitrogen. The range may be extended with sample dilution. URL: http://gce-lter.marsci.uga.edu/public/app/resource_details.asp?id=839 c. Instrumentation: Method 1: none Method 2: Technicon AutoAnalyzer II (AAII) Method 3: none Method 4: none Method 5: Technicon AutoAnalyzer II (AAII) Method 6: none Method 7: Technicon AutoAnalyzer II (AAII) 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 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 Method 7: not applicable 4. Project Personnel a. Personnel: 1: Merryl Alber 2: Jack T. Sandow, Jr. 3: Joan E. Sheldon 4: Adam Sapp b. Affiliations: 1: University of Georgia, Athens, Georgia 2: Aquatic Research South, Georgia 3: University of Georgia, Athens, Georgia 4: University of Georgia, Athens, Georgia III. Data Set Status and Accessibility A. Status 1. Latest Update: 06-Mar-2024 2. Latest Archive Date: 06-Mar-2024 3. Latest Metadata Update: 06-Mar-2024 4. Data Verification Status: Reviewed by IM 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: Aug 20, 2019, Public: Aug 20, 2019 b. Citation: Data provided by the Georgia Coastal Ecosystems Long Term Ecological Research Project, supported by funds from NSF OCE 1832178 (data set NUT-GCEM-1909) 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-GCEM-1909_2_0.CSV 2. Size: 162 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: 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 file processed: GCE_Monitoring query: SELECT dbo.vwRiverCombinedNuts.SampleDate, dbo.vwRiverCombinedNuts.SampleTime, dbo.vwRiverCombinedNuts.Station, dbo.vwRiverCombinedNuts.Location, dbo.vwRiverCombinedNuts.Platform, dbo.vwRiverCombinedNuts.WaterTemp, dbo.vwRiverCombinedNuts.WaterLevel, dbo.vwRiverCombinedNuts.DirectionOfChange, dbo.vwRiverCombinedNuts.SamplingNotes, dbo.vwRiverCombinedNuts.PO4, dbo.vwRiverCombinedNuts.Flag_PO4, dbo.vwRiverCombinedNuts.Total_P, dbo.vwRiverCombinedNuts.Flag_Total_P, dbo.vwRiverCombinedNuts.DOP, dbo.vwRiverCombinedNuts.Flag_DOP, dbo.vwRiverCombinedNuts.NO3, dbo.vwRiverCombinedNuts.Flag_NO3, dbo.vwRiverCombinedNuts.Total_N, dbo.vwRiverCombinedNuts.Flag_Total_N, dbo.vwRiverCombinedNuts.DON, dbo.vwRiverCombinedNuts.Flag_DON, dbo.vwRiverCombinedNuts.DOC, dbo.vwRiverCombinedNuts.Flag_DOC, dbo.vwRiverCombinedNuts.NH4, dbo.vwRiverCombinedNuts.Flag_NH4, dbo.vwRiverCombinedNuts.Silicate, dbo.vwRiverCombinedNuts.Flag_Silicate, dbo.vwRiverCombinedNuts.C_mgL, dbo.vwRiverCombinedNuts.Flag_ugC, dbo.vwRiverCombinedNuts.N_mgL, dbo.vwRiverCombinedNuts.Flag_ugN, dbo.vwRiverCombinedNuts.CN_ratio, dbo.vwRiverCombinedNuts.PCPN_analysis_notes FROM GCE_Monitoring.dbo.vwRiverCombinedNuts ORDER BY SampleDate (176 records) Data processing history: 06-Mar-2024: new GCE Data Structure 1.1 created ('newstruct') 06-Mar-2024: imported result set from SQL query on data source 'GCE_Monitoring' ('sql2struct') 06-Mar-2024: imported all documentation metadata from the template 'GCE_River_Nutrients', updating descriptors for columns Date, Time, Station, Location, Sampling_Platform, Water_Temperature, River_Stage, Trend, Sampling_Notes, Phosphate, Flag_Phosphate, Total_Phosphorus, Flag_Total_Phosphorus, Dissolved_Organic_Phosphorus, Flag_Dissolved_Organic_Phosphorus, Nitrate, Flag_Nitrate, Total_Nitrogen, Flag_Total_Nitrogen, Dissolved_Organic_Nitrogen, Flag_Dissolved_Organic_Nitrogen, Dissolved_Organic_Carbon, Flag_Dissolved_Organic_Carbon, Ammonium, Flag_Ammonium, Silicate, Flag_Silicate, Particulate_Carbon, Flag_Particulate_Carbon, Particulate_Nitrogen, Flag_Particulate_Nitrogen, PC_PN_ratio and PC_PN_notes ('meta_template') 06-Mar-2024: updated 59 metadata fields in the Data, Dataset, Project, Site, Status, Study, Supplement section(s) ('addmeta') 06-Mar-2024: updated title ('newtitle') 06-Mar-2024: updated title ('newtitle') 06-Mar-2024: updated 1 metadata fields in the Dataset section(s) ('addmeta') 06-Mar-2024: edited structure data ('ui_datagrid'): deleted record(s) 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175 and 176 06-Mar-2024: Q/C flagging criteria applied, 'flags' field updated ('dataflag') 06-Mar-2024: updated 1 metadata fields in the Dataset section(s) ('addmeta') 06-Mar-2024: imported Dataset, Project, Site, Study, Status, Supplement metadata descriptors from the GCE Metabase ('imp_gcemetadata') 06-Mar-2024: updated 57 metadata fields in the Dataset, Project, Site, Status, Study, Supplement section(s) ('addmeta') 06-Mar-2024: Units of column Date changed from 'M/D/YYYY' to 'yyyy-mm-dd ('ui_editor') 06-Mar-2024: updated 6 metadata fields in the Data section(s) ('addmeta') 06-Mar-2024: updated 15 metadata fields in the Status, Data sections to reflect attribute metadata ('updatecols') 06-Mar-2024: parsed and formatted metadata ('listmeta') B. Variable Information 1. Variable Name: column 1. Date column 2. Time column 3. Station column 4. Location column 5. Sampling_Platform column 6. Water_Temperature column 7. River_Stage column 8. Trend column 9. Sampling_Notes column 10. Phosphate column 11. Flag_Phosphate column 12. Total_Phosphorus column 13. Flag_Total_Phosphorus column 14. Dissolved_Organic_Phosphorus column 15. Flag_Dissolved_Organic_Phosphorus column 16. Nitrate column 17. Flag_Nitrate column 18. Total_Nitrogen column 19. Flag_Total_Nitrogen column 20. Dissolved_Organic_Nitrogen column 21. Flag_Dissolved_Organic_Nitrogen column 22. Dissolved_Organic_Carbon column 23. Flag_Dissolved_Organic_Carbon column 24. Ammonium column 25. Flag_Ammonium column 26. Silicate column 27. Flag_Silicate column 28. Particulate_Carbon column 29. Flag_Particulate_Carbon column 30. Particulate_Nitrogen column 31. Flag_Particulate_Nitrogen column 32. PC_PN_ratio column 33. PC_PN_notes 2. Variable Definition: column 1. Date of Sample Collection column 2. Time of sample collection column 3. GCE Sampling Station ID column 4. Sampling Location column 5. Platform from which the sample was taken column 6. Temperature of surface water at time of sampling column 7. River stage at time of sampling column 8. Which way the river stage is trending column 9. Notes from sample log column 10. Phosphate as P column 11. QA/QC flags for Phosphate as P column 12. Total Phosphurus as PO4-P column 13. QA/QC flags for Total Phosphurus as PO4-P column 14. Dissolved Organic Phosphate as P column 15. QA/QC flags for Dissolved Organic Phosphate as P column 16. Nitrate as N column 17. QA/QC flags for Nitrate as N column 18. Total Nitrogen as NO3-N column 19. QA/QC flags for Total Nitrogen as NO3-N column 20. Dissolved Organic Nitrogen as N column 21. QA/QC flags for Dissolved Organic Nitrogen as N column 22. Dissolved Organic Carbon as C column 23. QA/QC flags for Dissolved Organic Carbon as C column 24. Ammonium as N column 25. QA/QC flags for Ammonium as N column 26. Silicate concentration column 27. QA/QC flags for Silicate concentration column 28. Particulate Carbon concentation(average of replicates) column 29. QA/QC flags for Particulate Carbon concentation(average of replicates) column 30. Particulate Nitrogen concentration(average of replicates) column 31. QA/QC flags for Particulate Nitrogen concentration(average of replicates) column 32. Particulate carbon to particulate nitrogen ratio column 33. Notes from PCON sample analysis 3. Units of Measurement: column 1. yyyy-mm-dd column 2. HH:MM:SS column 3. none column 4. none column 5. none column 6. C column 7. ft column 8. none column 9. none column 10. ppb column 11. none column 12. ppb column 13. none column 14. ppb column 15. none column 16. ppb column 17. none column 18. ppm column 19. none column 20. ppm column 21. none column 22. ppm column 23. none column 24. ppb column 25. none column 26. uM column 27. none column 28. mg/L column 29. none column 30. mg/L column 31. none column 32. none column 33. none 4. Data Type a. Storage Type: column 1. string column 2. string column 3. string column 4. string column 5. string column 6. floating-point column 7. floating-point column 8. string 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. 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: Tide: LW = Low Water, HW = High Water Flag_Phosphate: Q = questionable value, I = invalid value, C = corrected value, BDL = Below detection limit Flag_Total_Phosphorus: Q = questionable value, I = invalid value, C = corrected value, BDL = Below detection limit Flag_Dissolved_Organic_Phosphorus: Q = questionable value, I = invalid value, C = corrected value, BDL = Below detection limit Flag_Nitrate: Q = questionable value, I = invalid value, C = corrected value, BDL = Below detection limit Flag_Total_Nitrogen: Q = questionable value, I = invalid value, C = corrected value, BDL = Below detection limit Flag_Dissolved_Organic_Nitrogen: Q = questionable value, I = invalid value, C = corrected value, BDL = Below detection limit Flag_Dissolved_Organic_Carbon: Q = questionable value, I = invalid value, C = corrected value, BDL = Below detection limit Flag_Ammonium: Q = questionable value, I = invalid value, C = corrected value, BDL = Below detection limit Flag_Silicate: Q = questionable value, I = invalid value, C = corrected value, BDL = Below detection limit Flag_Particulate_Carbon: Q = questionable value, I = invalid value, C = corrected value, BDL = Below detection limit Flag_Particulate_Nitrogen: Q = questionable value, I = invalid value, C = corrected value, BDL = Below detection limit c. Numeric Range: column 1. (none) column 2. (none) column 3. (none) column 4. (none) column 5. (none) column 6. 7.8 to 31.7 column 7. 1.3 to 14.57 column 8. (none) column 9. (none) column 10. 0 to 61.148 column 11. (none) column 12. 9.5544 to 474.6938 column 13. (none) column 14. 5.1634 to 458.9509 column 15. (none) column 16. 0 to 595 column 17. (none) column 18. 0.32906 to 1.6944 column 19. (none) column 20. 0.11219 to 1.4179 column 21. (none) column 22. 2.564 to 18.5404 column 23. (none) column 24. 0 to 287.301 column 25. (none) column 26. 14.1727 to 516.2888 column 27. (none) column 28. 0.32072 to 7.6144 column 29. (none) column 30. 0.031655 to 0.73642 column 31. (none) column 32. 1.4147 to 50.5784 column 33. (none) d. Missing Value Code: 5. Data Format a. Column Type: column 1. text column 2. text column 3. text column 4. text column 5. text column 6. numerical column 7. numerical column 8. text 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. 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. 1 column 7. 2 column 8. 0 column 9. 0 column 10. 2 column 11. 0 column 12. 2 column 13. 0 column 14. 2 column 15. 0 column 16. 2 column 17. 0 column 18. 3 column 19. 0 column 20. 2 column 21. 0 column 22. 2 column 23. 0 column 24. 2 column 25. 0 column 26. 2 column 27. 0 column 28. 2 column 29. 0 column 30. 2 column 31. 0 column 32. 2 column 33. 0 6. Logical Variable Type: column 1. datetime (none) column 2. datetime (none) column 3. nominal (none) column 4. nominal (none) column 5. free text (none) column 6. data (continuous) column 7. data (continuous) column 8. free text (none) column 9. free text (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. coded value (none) column 18. data (continuous) column 19. coded value (none) column 20. data (continuous) column 21. coded value (none) column 22. data (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. data (continuous) column 31. coded value (none) column 32. data (continuous) column 33. free text (none) 7. Flagging Criteria: column 1. none column 2. none column 3. none column 4. none column 5. none column 6. none column 7. none column 8. none column 9. none column 10. none column 11. none column 12. none column 13. none column 14. none column 15. none column 16. none column 17. none column 18. none column 19. none column 20. none column 21. none column 22. none column 23. none column 24. none column 25. none column 26. none column 27. none column 28. none column 29. none column 30. none column 31. none column 32. none column 33. none C. Data Anomalies: V. Supplemental Descriptors A. Data Acquisition 1. Data Forms: 2. Form Location: 3. Data Entry Validation: B. Quality Assurance/Quality Control Procedures: C. Supplemental Materials: D. Computer Programs: 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