Rabalais, N. Unknown Database Hydrographic data were collected during a July 16 - 20, 1991 survey of the Louisiana continental shelf. Nutrient, pigment, suspended sediment and station information data were also acquired. The physical, biological and chemical data collected are part of a long-term coastal Louisiana dataset. The goal is to understand physical and biological processes that contribute to the causes of hypoxia and use the data to support environmental models for use by resource managers. 19910716 Unknown 19910720 Unknown ground condition Complete As needed Louisiana coastal waters, Northwestern Gulf of Mexico. -93.58 -89.47 29.71 28.49 29.71 -93.58 28.49 -89.47 28.49 -93.58 29.71 -89.47 29.71 -93.58 GCMD NASA's Global Change Master Dir. THEME EARTH SCIENCE > Biosphere > Ecological Dynamics > Biogeochemical Cycles EARTH SCIENCE > Biosphere > Ecological Dynamics > Nutrient Cycling EARTH SCIENCE > Biosphere > Ecological Dynamics > Oxygen Demand EARTH SCIENCE > Biosphere > Ecological Dynamics > Primary Production EARTH SCIENCE > Human Dimensions > Environmental Impacts > Eutrophication EARTH SCIENCE > Hydrosphere > Water Quality EARTH SCIENCE > Hydrosphere > Water Quality > Chlorophyll EARTH SCIENCE > Hydrosphere > Water Quality > Conductivity EARTH SCIENCE > Hydrosphere > Water Quality > Light Transmission EARTH SCIENCE > Hydrosphere > Water Quality > Nitrogen Compounds EARTH SCIENCE > Hydrosphere > Water Quality > Nutrients EARTH SCIENCE > Hydrosphere > Water Quality > Oxygen EARTH SCIENCE > Hydrosphere > Water Quality > Suspended Solids EARTH SCIENCE > Hydrosphere > Water Quality > Water Temperature EARTH SCIENCE > Oceans > Coastal Processes EARTH SCIENCE > Oceans > Marine Environment Monitoring EARTH SCIENCE > Oceans > Ocean Chemistry > Ammonia > Ammonium EARTH SCIENCE > Oceans > Ocean Chemistry > Biogeochemical Cycles EARTH SCIENCE > Oceans > Ocean Chemistry > Chlorophyll EARTH SCIENCE > Oceans > Ocean Chemistry > Nitrate EARTH SCIENCE > Oceans > Ocean Chemistry > Nitrite EARTH SCIENCE > Oceans > Ocean Chemistry > Nitrogen EARTH SCIENCE > Oceans > Ocean Chemistry > Nutrients EARTH SCIENCE > Oceans > Ocean Chemistry > Oxygen EARTH SCIENCE > Oceans > Ocean Chemistry > Phosphate EARTH SCIENCE > Oceans > Ocean Chemistry > Pigments EARTH SCIENCE > Oceans > Ocean Chemistry > Silicate EARTH SCIENCE > Oceans > Ocean Circulation > Fronts EARTH SCIENCE > Oceans > Ocean Optics > Secchi Depth EARTH SCIENCE > Oceans > Ocean Temperature EARTH SCIENCE > Oceans > Salinity/Density EARTH SCIENCE > Oceans > Water Quality GCMD NASA's Global Change Master Dir. PLACE Gulf Of Mexico North Atlantic Ocean United States Of America North America Northern Hemisphere Sea Surface None 1. Dataset credit required. 2. Experience with similar datasets has shown that when data are plotted or used in further analysis, outlying values may occasionally be discovered. Please report any possible problems with the data to N. Rabalais. Nancy N. Rabalais Louisiana Universities Marine Consortium mailing address

Louisiana Universities Marine Consortium 8124 Hwy 56

Chauvin LA 70344 USA 985 851 2800 985 851 2874 Unknown Rabalais, N.N., Turner, R.E. and Wiseman Jr, W.J. Funding: Funds for the research were provided by the National Oceanographic and Atmospheric Administration, Nutrient Enhanced Coastal Ocean Productivity (NECOP) program. None Unclassified None Windows 2000, MSAccess 2000 Autoanalyzer Unknown. Tom Oswald mailing address

110 Coastal Studies Coastal Ecology Institute LSU

Baton Rouge LA 70803 225 388-6700 Unknown Fluorometer Contact Turner Designs. Turner Designs Inc. mailing address

845 W. Maude Avenue

Sunnyvale CA 94085 US 877 316-8049 Transmissometer Sea Tech, Inc. was acquired by Wet Labs, Inc. as of June 1, 1998. Contact Wet Labs, Inc. Wet Labs, Inc. mailing and physical address

620 Applegate St.

Philomath OR 97370-0518 US 541 929-5650 Beckman type dissolved oxygen sensor. Contact Sea-Bird Electronics, Inc. Sea-Bird Electronics, Inc. mailing and physical address

1808 136th Place NE

Bellevue WA 98005 USA 425 643-9866 seabird@seabird.com Temperature sensor. Contact Sea-Bird Electronics, Inc. Sea-Bird Electronics, Inc. mailing and physical address

1808 136th Place NE

Bellevue WA 98005 USA 425 643-9866 seabird@seabird.com Conductivity sensor. Contact Sea-Bird Electronics, Inc. Sea-Bird Electronics, Inc. mailing and physical address

1808 136th Place NE

Bellevue WA 98005 USA 425 643-9866 seabird@seabird.com CTD Contact Sea-Bird Electronics, Inc. Sea-Bird Electronics, Inc. mailing and physical address

1808 136th Place NE

Bellevue WA 98005 USA 425 643-9866 seabird@seabird.com Pressure sensor. Contact Sea-Bird Electronics, Inc. Sea-Bird Electronics, Inc. mailing and physical address

1808 136th Place NE

Bellevue WA 98005 USA 425 643-9866 seabird@seabird.com A navigation device that uses a radio navigation system operated by the U.S. Coast Guard. Contact Northstar Technologies Inc. Northstar Technologies Inc. mailing address

Northstar Technologies

Acton Mass. 01720 978-897-6600 service@northstarcmc.co Fluorometer Sea Tech, Inc. was acquired by Wet Labs, Inc. as of June 1, 1998. Contact Wet Labs, Inc. Wet Labs, Inc. mailing and physical address

620 Applegate St.

Philomath OR 97370-0518 US 541 929-5650 Fathometer Japan Radio Co. Ltd. Japan Radio Co. Ltd. mailing address

Akasaka Twin Tower (Main), 17-22, Akasaka 2-chome, Minato-ku,

TOKYO Unknown Unknown JAPAN 81-3-3584-8836 S791Hydro: Temperature, dissolved oxygen, percent oxygen saturation, conductivity, salinity, density, percent light transmission, fluorescence and depth were acquired with a SeaBird 911 CTD system which was used to obtain water column profiles at all stations. Oxygen concentration determinations, upper and lower end, were made prior to the cruise by the LUMCON CTD technician and entered into the SeaSoft configuration file. Winkler oxygen titrations were conducted during the cruise. A regression equation developed from Winkler titrations, demonstrated that a correction of the SeaBird oxygen data could not be determined from the range of Winkler values. Oxygen data were omitted from the top of casts if concentrations indicated that the CTD oxygen probe was not equilibrated due to inadequate "soak" time or too fast a lowering speed. Oxygen data were removed from one or more depths at 44 of the 69 the stations sampled. Data reductions from the SeaBird were generated by Ben Cole and quality controlled by Nancy Rabalais. Sea-Tech Fluorometer values were negative at one or more depth sampled at 39 of 69 CTD stations. Negative values imply bad connection, calibration or configuration. Fluorometer voltage data should be considered suspect. S791Nutrient: Nutrient analyses were conducted by Tom Oswald under the supervision of R. E. Turner S791Pigment: The Turner Designs model 10 fluorometer was calibrated for chlorophyll a against a chemical supply house chlorophyll a standard measured on a spectrophotometer yearly (or more frequently if needed). During the cruise, the Fluorometer was blanked and calibrated daily in accordance with Turner Designs recommended procedures. Chlorophyll concentrations were supervised and quality controlled by Nancy Rabalais. S791Stns Station Depth (JRC fathometer) values are less than maximum SeaBird CTD pressure sensor depth values at stations B4, B6 and F7. S791SuspSed: Suspended sediment concentrations were supervised and quality controlled by Nancy Rabalais N. Rabalais performed an additional procedure in quality-control/quality-assurance by evaluating relationships between the data in S791Hydro, S791Nutrient, S791Pigment and S791Stns. Unknown Unknown. Station positions were logged from RV Pelican's NorthStar LORAN C at the beginning of sampling operations. Manufacturer's accuracy claim is 30 meters 90% of the time. Wind, currents and tidal forces may have moved the ships from the beginning positions. Field Pigment Water for chlorophyll analyses was collected from surface by bucket and bottom waters in 5 liter Niskin bottles. Water for chlorophyll analysis (50 - 100 ml) is filtered on board ship through GF/F (0.7 micron) filters, which are then fixed in 5 ml of DMSO/90% acetone (40/60) solution, allowed to extract for at least one hour in the dark, then measured pre- and post-acidification on a Turner Model 10 fluorometer. Field Station Locations Stations were occupied along 14 generally North-South transects across the Louisiana coastal shelf and into Texas waters. Station depths ranged from 4.5 to 62.5 meters. The objective was to delimit and describe the area of midsummer bottom dissolved oxygen less than 2 (mg/L). Northern end stations of transects were chosen based on the survey vessel's minimum depth limits for each longitude. The northern extent of hypoxia was not reached on five transects. Optimally, one or two stations South of the Southern most station with bottom dissolved oxygen less than 2 (mg/L) were sampled. Field Nutrient Water for nutrient analyses was collected from surface by bucket and bottom waters in 5-liter Niskin bottles. Care was taken that the collector's hands were clean and avoided touching the water. Three replicate sample vials and caps were triple rinsed with sample before vial filling and closing. Samples were not filtered. The sample vials were frozen for later analysis in the laboratory. Field Niskin The CTD unit was mounted on a rosette sampler fitted with 12 5-liter Niskin bottles for recovering water samples at discrete depths. Lab Nutrient Nitrogen and phosphorus were analyzed according to methods described in EPA publication EPA 600/4-79-020 (1979), method 350.1 for ammonia-N, method 353.2 for nitrate/nitrite-N, and method 365.1 for phosphate-P. Silicate was analyzed according to Technicon Industrial method 186-72 W/B (1977). Lab CTD CTD data were post processed using Seasoft version 3.3. All scans were processed without averaging or interpolation with a bin size of one scan. Data values reported are from downcasts. Adjustment was not made to compensate for the delay in oxygen sensor response time. Downcast scans selected for each CTD station are chosen to illustrate: 1) data values as near to the surface as possible, 2) data values at whole meter increments, and 3) data values as close to the bottom as the CTD was lowered. In certain cases where data values of a parameter changed significantly between whole meter increments, 0.1 or 0.2 meter scans were selected. Field Suspended Sediment Water for suspended sediment samples was collected from surface by bucket and other depths by 5-liter Niskin bottles. Water (approximately 300 to 500 ml) was filtered on board ship through pre-weighed GF/F filters. The filters were placed in Petri dishes and frozen for later analysis. Lab Suspended Sediment Suspended sediment filters were dried 24 hours at 40 - 60 degrees centigrade for 24 hours. Filters were weighed. Total suspended sediments was derived from volume filtered, pre-weight and post weight values. Unknown. Unknown Unknown Point Point 69 0.0001 0.0001 Degrees and decimal minutes WGS84 WGS84 6378137 298.257223563 S791Hydro The table lists values for SeaBird CTD station conductivity, density sigma-t, fluorometer voltage, dissolved oxygen, percent oxygen saturation, salinity, percent light transmission and temperature values at depths. There are 1716 records. None. Cond Conductivity Producer defined 3.18802 5.75249 S/m 19910716 19910720 Density Density sigma-t Producer defined 8.8775 25.8825 Density sigma-t 19910716 19910720 Depth Depth of SeaBird pressure sensor Producer Defined 0.003 60.219 Meters 19910716 19910720 Fluor Fluorometer voltage Producer defined Character field, generally numeric equivalent of text value except in 15 cases where "">10.0"" indicates fluorometer was maximized. -0.3635 8.965 volts 19910716 19910720 O2 Dissolved oxygen Producer defined 0.34660972 9.07748825 mg/L 19910716 19910720 PctO2Sat Oxygen percent saturation Producer defined 5.2 135.7 Percent 19910716 19910720 PctXmiss Percent light transmission Producer defined. 36.6 97.5 Percent 19910716 19910720 Sal Salinity Producer defined 17.8274 36.4342 ppt 19910716 19910720 Sta Station name of location sampled Producer defined Character field 19910716 19910720 StnID Station identification number Producer defined 1049 1231 Integer 19910716 19910720 Temp Temperature Producer defined 19.749 31.6567 Degrees centigrade 19910716 19910720 S791Nutrient The table lists values for station NH4, NO2, NO2+NO3, NO3, PO4 and SiO3 values at depths. There are 201 records. None. Depth Depth of SeaBird p sensor, 0.0 = bucket surface sample. Producer defined 0.0 60.14 Meters 19910716 19910720 NH4 Ammonium Producer defined 0.2 64.7 µg-at/L 19910716 19910720 NO2 Nitrite Producer defined 0.1 7.2 µg-at/L 19910716 19910720 NO2+NO3 Nitrite+Nitrate Producer defined 0.2 75.6 µg-at/L 19910716 19910720 NO3 Nitrate Producer defined 0 68.4 µg-at/L 19910716 19910720 PO4 Phosphate Producer defined 0.1 6.5 µg-at/L 19910716 19910720 SiO3 Silicate Producer defined 1.3 44.8 µg-at/L 19910716 19910720 Sta Station name of location sampled Producer defined Character field 19910716 19910720 StnID Station identification number Producer defined 1049 1231 Integer 19910716 19910720 S791Pigment The table lists values for station mean chlorophyll a, Fo/Fa ratio, mean phaeopigment and total pigment values at depths. There are 206 records. None. Depth Depth of SeaBird p sensor, 0.0 = bucket surface sample. Producer defined 0 60.14 Meters 19910716 19910720 MeanC Mean Chlorophyll a Producer defined 0.05 19.04 µg/L 19910716 19910720 MeanF Mean Fo/Fa ratio Producer defined 0.68 2.04 FoFa ratio 19910716 19910720 MeanP Mean Phaeopigments Producer defined 0.11 12.9 µg/L 19910716 19910720 Sta Station name of location sampled Producer defined Character field 19910716 19910720 StnID Station identification number Producer defined 1049 1231 Integer 19910716 19910720 Total Total pigments Producer defined 0.17 31.94 µg/L 19910716 19910720 S791Stns The table lists values for station, date, fathometer, latitude, longitude, Secchi disk, time of SeaBird cast and station ID. There are 69 records. None. Date Date station was sampled. Producer defined. 19910716 19910720 YYYYMMDD 19910716 19910720 Fath Estimated total depth of station from ship's fathometer, with addition of constant hull depth. Producer defined 4.5 62.5 meters 19910716 19910720 Latitude Latitude of sampling station. Producer defined. 28.4998 29.706 Decimal degrees 19910716 19910720 -9999 Latitude value was recorded from the ship's LORAN C at the beginning of sampling operations. Manufacturer's accuracy claim is 30 meters 90% of the time. Wind, currents and tidal forces may move the ship from the beginning position. Survey vessel was not anchored during sampling. Position at end of sample operations may have changed from beginning operations location. Vessel drift was generally less than 0.3 nm. An Accuracy value of -9999 was entered because accuracy could not be determined. Longitude Longitude of sampling station. Producer defined. -93.5783 -89.4748 Decimal degrees 19910716 19910720 -9999 Latitude value was recorded from the ship's LORAN C at the beginning of sampling operations. Manufacturer's accuracy claim is 30 meters 90% of the time. Wind, currents and tidal forces may move the ship from the beginning position. Survey vessel was not anchored during sampling. Position at end of sample operations may have changed from beginning operations location. Vessel drift was generally less than 0.3 nm. An Accuracy value of -9999 was entered because accuracy could not be determined. Secchi Secchi disk depth in meters. Producer defined. Character field. Most depth are in meters. Stations K5 and H4 have values of >9.0m and >9.5m respectively. 19910716 19910720 Sta Station name of location sampled. Producer defined. Character field 19910716 19910720 StnID Station identification number. Producer defined. 1049 1231 Integer 19910716 19910720 Time Time of beginning of SeaBird CTD cast. Producer defined. 0:27 23:15 HH:mm 19910716 19910720 S791SuspSed The table lists values for station, depth, suspended sediments and station ID. There are 56 records. None. Depth SeaBird CTD pressure sensor depth when sample was collected. A value of 0 indicates sample was a surface bucket sample. Producer defined 0 29.34 meters 19910716 19910720 Sta Station name of location sampled. Producer defined. Character field. 19910716 19910720 StnID Station identification number. Producer defined. 1062 1231 Integer 19910716 19910720 SuspSed Total suspended sediments Producer defined 2.3 44 mg/L 19910716 19910720 The related data tables S791Hydro, S791Nutrient, S791Pigment, S791Stns and S791SuspSed contain spatial, temporal, physical and biological water quality data acquired during the July 1991 cruise. Each table contains a StnID field that can be used to key joins with the other tables. For detailed attribute information contact Nancy Rabalais. Nancy N. Rabalais Louisiana Universities Marine Consortium mailing address

Louisiana Universities Marine Consortium 8124 Hwy 56

Chauvin LA 70344 USA 985 851 2800 985 851 2874 Unknown I, the data requestor, agree to credit the data originators in any publications, reports or presentations generated from this data. I also accept that although these data have been processed successfully on a computer system at the Louisiana Universities Marine Consortium, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. I recognize that these data are best acquired from the originator and not from a secondary source. I recognize that careful attention must be paid to the contents of the metadata file associated with these data. I will not hold Louisiana Universities Marine Consortium liable for improper or incorrect use of the data described and/or contained herein. This disclaimer applies both to individual use of the data and aggregate use with other data. MDB 9 File compression not used. 0.52 3-1/2 inch floppy disk DOS Copy S791.mdb Contact Distributor. None Call, email or write the Distributor with requests for data sets. None. Contact distributor 20020517 20020701 20120615 Ben Cole Louisiana Universities Marine Consortium mailing address

LUMCON 8124 Hwy 24

Chauvin LA 70344 USA 985 851 2800 985 851 2874 Unknown FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time