Rabalais, N. 20020901 Database Hydrographic data were collected during a July 23 - 27, 1990 survey of the Louisiana continental shelf. Nutrient, pigment 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. 19900723 Unknown 19900727 Unknown ground condition Complete As needed -93.45 -89.45 29.65 28.25 29.65 -93.45 28.25 -89.45 28.25 -93.45 29.65 -89.45 29.65 -93.45 Louisiana coastal waters, Northwestern Gulf of Mexico. 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 > 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 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 S790Hydro: 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. A correction was made on the CTD oxygen data based on a regression equation developed from Winkler titrations on board ship. Winkler titrations were conducted under the supervision of Nancy Rabalais. The data for the shelfwide summer 1990 hypoxia cruise were corrected according to a regression equation developed from Winkler titrations. Oxygen data were omitted from the top of cast if concentrations indicated that the CTD oxygen probe was not equilibrated due to inadequate "soak" time or too fast a lowering speed. Oxygen data from an entire CTD cast were omitted from the data set, if there were indications that the oxygen probe never equilibrated. There are numerous oxygen data gaps in the shelfwide 1990 cruise data set. Improper equilibration of the oxygen probe, raising and lowering of the CTD unit in the upper water column prior to the beginning of a cast, and too fast a lowering speed for the CTD unit resulted in a severely reduced oxygen data set. Rather than submit suspect data to the NECOP master database, the principal investigator eliminated those values prior to submission. Oxygen data are missing at some or all depths at the stations listed below: A2, A3, A4, A5, A6, A7, A'1, A'2, A'3, A1, B1, B2, B4, B6, B8, B9, C10, C3, C5, C6A, C7, C8A, C9A, D1, D2, D4, D5, D6, D7, E1, E2, E2A, E3, E4, E5, E6, F2, F3, F4, F5, G5, G2, G3, G4, H3, I1, I2, I3, I4, I5, I6, I7, J5, K3, K4, K5, H4, J3 and K2. Fluorometer voltage values were in excess of 10.00 at one or more depths at the stations listed : A4, A'4, A'5, E1 and G2. S790Nutrient: Nutrient analyses are conducted by Tom Oswald under the supervision of R. E. Turner. S790Pigment: 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. N. Rabalais performed an additional procedure in quality-control/quality-assurance by evaluating relationships between the data in S790Hydro, S790Nutrient, S790Pigment and S790Stns. 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. Unknown. Unknown 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 12 generally North-South transects across the Louisiana coastal shelf. Station depths ranged from 5 to 65 meters. The objective was to delimit and describe the area of midsummer bottom dissolved oxygen less than 2(mg/L). Biological, chemical and physical properties of the water are measured. Northern end stations of transects were chosen based on the survey vessel's minimum depth limits for each longitude. Optimally, one or two stations South of the Southern most station with bottom dissolved oxygen less than 2 (mg/L). Due to constraints of time and funding it was not possible to sample the southern limits of low oxygen for all transects. As it was necessary to remove bad and questionable data from western stations, whether the western limit of the hypoxic water mass was reached is unknown. 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 Nutrients Samples for nutrients were frozen on board ship for later analysis in the laboratory. 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). Unknown Point Point 63 0.0001 0.0001 Degrees and decimal minutes WGS84 WGS84 6378137 298.257223563 S790Hydro The table lists 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 2.24585 5.82435 S/m 19900723 19900727 Density Density sigma-t Producer defined 4.46 25.4152 Density sigma-t 19900723 19900727 Depth Depth of SeaBird pressure sensor Producer Defined 0.32 65.002 Meters 19900723 19900727 Fluor Fluorometer voltage Producer defined Character field, generally numeric equivalent of text value except in 15 cases where ">10.0" indicates fluorometer was maximized. 19900723 19900727 O2 Dissolved oxygen Producer defined 0.208988 13.243502 mg/L 19900723 19900727 PctO2Sat Oxygen percent saturation Producer defined 3 192.2 Percent 19900723 19900727 PctXmiss Percent light transmission Producer defined. 7.8 95 Percent 19900723 19900727 Sal Salinity Producer defined 12.049 37.5035 ppt 19900723 19900727 Sta Station name of location sampled Producer defined Character field 19900723 19900727 StnID Station identification number Producer defined 865 927 Integer 19900723 19900727 Temp Temperature Producer defined 21.567 31.8352 Degrees centigrade 19900723 19900727 S790Nutrient The table lists station NH4, NO2, NO2+NO3, NO3, PO4 and SiO3 values at depths. There are 129 records. None. Depth Depth of SeaBird p sensor, 0.0 = bucket surface sample. Producer defined 0.0 63.7 Meters 19900723 19900727 NH4 Ammonium Producer defined 0.8 40.7 µg-at/L 19900723 19900727 NO2 Nitrite Producer defined 0.3 80.8 µg-at/L 19900723 19900727 NO2+NO3 Nitrite+Nitrate Producer defined 0.6 81.6 µg-at/L 19900723 19900727 NO3 Nitrate Producer defined 0.1 75 µg-at/L 19900723 19900727 PO4 Phosphate Producer defined 0.2 5.7 µg-at/L 19900723 19900727 SiO3 Silicate Producer defined 0.3 91.5 µg-at/L 19900723 19900727 Sta Station name of location sampled Producer defined Character field 19900723 19900727 StnID Station identification number Producer defined 865 927 Integer 19900723 19900727 S790Pigment The table lists station mean chlorophyll a, Fo/Fa ratio, mean phaeopigment and total pigment values at depths. There are 128 records. None. Depth Depth of SeaBird p sensor, 0.0 = bucket surface sample. Producer defined 0 63.7 Meters 19900723 19900727 MeanC Mean Chlorophyll a Producer defined 0 153.74 µg/L 19900723 19900727 MeanF Mean Fo/Fa ratio Producer defined 0.59 2 FoFa ratio 19900723 19900727 MeanP Mean Phaeopigments Producer defined 0.06 61.49 µg/L 19900723 19900727 Sta Station name of location sampled Producer defined Character field 19900723 19900727 StnID Station identification number Producer defined 865 927 Integer 19900723 19900727 Total Total pigments Producer defined 0.42 209.72 µg/L 19900723 19900727 S790Stns The table lists station, date, fathometer, latitude, longitude, Secchi disk, time of SeaBird cast and station ID. There are 63 records. None. Date Date station was sampled. Producer defined. 19900723 19900727 YYYYMMDD 19900723 19900727 Fath Estimated total depth of station from ship's fathometer, with addition of constant hull depth. Producer defined 5 65 meters 19900723 19900727 Latitude Latitude of sampling station. Producer defined. 28.2665 29.6422 Decimal degrees 19900723 19900727 -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. -93.4172 -89.4752 Decimal degrees 19900723 19900727 -9999 Longititude 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. Producer defined. 0.7 20 meters 19900723 19900727 Sta Station name of location sampled. Producer defined. Character field 19900723 19900727 StnID Station identification number. Producer defined. 865 927 Integer 19900723 19900727 Time Time of beginning of SeaBird CTD cast. Producer defined. 0:17:00 23:43:00 HH:mm:ss 19900723 19900727 The related data tables S790Hydro, S790Nutrient, S790Pigment, and S790Stns contain spatial, temporal, physical and biological water quality data acquired during the July 1990 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. 0.412 3-1/2 inch floppy disk DOS Copy S790.mdb Contact Distributor. None Call, email or write the Distributor with requests for data sets. None. Contact distributor 20020514 20020628 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