Rabalais, N. Unknown Database Hydrographic data were collected during a July 24 - 29, 1992 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. 19920724 Unknown 19920729 Unknown ground condition Complete As needed -93.43 -89.47 29.52 28.39 29.52 -93.43 28.39 -89.47 28.39 -93.43 29.52 -89.47 29.52 -93.43 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 > pH 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 > pH EARTH SCIENCE > Hydrosphere > Water Quality > Suspended Solids EARTH SCIENCE > Hydrosphere > Water Quality > Water Temperature 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. THEME EARTH SCIENCE > Oceans > Ocean Chemistry > Ammonia > Ammonium 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 CTD Contact HydroLab Corporation Hydrolab Corporation mailing address

8700 Cameron Road

Austin TX 78754 US 800-949-3766 techsupport@hydrolab.com 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 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 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 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 S792Hydrolab: Temperature, dissolved oxygen, percent oxygen saturation, conductivity, salinity, density, and depth data were acquired with a Hydrolab Surveyor3 CTD. Dissolved oxygen values for the Hydrolab Surveyor 3 were pre- and post-calibrated by air saturated water concentrations and barometric pressure from a laboratory grade barometer. Salinity and pH were pre- and post-calibrated with the appropriate solutions. S792Nutrient: Nutrient analyses were conducted by Tom Oswald under the supervision of R. E. Turner S792Pigment: 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. S792Seabird: Temperature, dissolved oxygen, percent oxygen saturation, conductivity, salinity, density, percent light transmission, fluorescence and depth were acquired with a SeaBird 911 CTD system that 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 gave a strong, good relationship. A correction of the SeaBird oxygen data was not necessary. Due to a delay in response time of the oxygen sensor, oxygen data were not aligned well with conductivity and temperature depths in this dataset. Downcast dissolved oxygen values probably related better to other parameters in 1 meter above the oxygen probe. Bottom dissolved oxygen values were equilibrated. 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 6 of the 71 the stations sampled. Dissolved oxygen and percent oxygen saturation values were negative for two depths at Station A3. Data reductions from the SeaBird were generated by Ben Cole and quality controlled by Nancy Rabalais. S792Stns: Position coordinates were logged from RV Pelican’s Loran C. Station depths were logged from the ship’s fathometer. S792SuspSed: 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 S792Hydrolab, S792Nutrient, S792Pigment, S792Seabird and S792Stns. 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 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 6 to 52 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. The limit of hypoxia on the Southern end of transect A was not reached. Station C6B was sampled twice. Field Nutrient 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. 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 3.4H. All scans were processed without averaging or interpolation with a bin size of one scan. Data values reported are from downcasts. 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-meter scans were selected. Field Suspended Sediment Water (approximately 300 to 500 ml) was filtered on board ship through pre-weighed GF/F filters, rinsed with distilled water. 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. Field water samples Water for chlorophyll, nutrient analyses, and suspended sediments were collected from the surface by bucket, from mid-water in 5-l Niskin bottles on the Seabird CTD/rosette system, and from bottom in a 30-l bottom tripping Niskin bottle secured in a frame with the Hydrolab Surveyor 3. Depth of 0.00 or "bucket" indicates a bucket sample collected from the surface of the water. Deepest depths of water samples were from the bottom-tripping Niskin and correspond to the deepest depth recorded from the Hydrolab. Other depths indicate the p-sensor reading for 5-l Niskin bottles on the rosette. p-sensor was located approx. 1 meter below the mid-point of the 5-l Niskin. Pigment sample depth values = "midas" indicate samples were collected from RV Pelican’s seawater flow-through system. The seawater intake was located in the sea chest approximately 3 meters below the surface. Bottom water sample at station H6 was collected with CTD Niskin Bottle. Field Hydrolab Hydrolab data were obtained for the lowest 2 m of the water column, the upper 1 m of the water column, and as close to the surface as possible. Hydrolab data were omitted from the top of the cast, if the salinity values indicated that the probes were out of the water. Unknown Point Point 71 0.0001 0.0001 Degrees and decimal minutes WGS84 WGS84 6378137 298.257223563 S792Seabird 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 1845 records. None. Cond Conductivity Producer defined 3.05408 5.63284 S/m 19920724 19920729 Density Density sigma-t Producer defined 8.6657 25.7069 Density sigma-t 19920724 19920729 Depth Depth of SeaBird pressure sensor Producer defined 0.066 51.45 Meters 19920724 19920729 Fluor Fluorometer voltage Producer defined 0.4844 3.332 volts Character field, generally numeric equivalent of text value except in 15 cases where """">10.0"""" indicates fluorometer was maximized. 19920724 19920729 O2 Dissolved oxygen Producer defined -0.61 10.153 mg/L 19920724 19920729 PctO2Sat Oxygen percent saturation Producer defined -8.8 151.3 Percent 19920724 19920729 PctXmiss Percent light transmission Producer defined. 47.2 94.4 Percent 19920724 19920729 Sal Salinity Producer defined 17.2465 37.2333 ppt 19920724 19920729 Sta Station name of location sampled Producer defined Character field 19920724 19920729 StnID Station identification number Producer defined 1233 1303 Integer 19920724 19920729 Temp Temperature Producer defined 20.1902 31.0083 Degrees centigrade 19920724 19920729 S792Nutrient The table lists values for station NH4, NO2, NO2+NO3, NO3, PO4 and SiO3 values at depths. There are 178 records. None. Depth 0.0 = bucket surface sample. Depth of SeaBird p sensor for mid-water samples. Depth of Hydrolab p-sensor for bottom samples. Producer defined 0.0 52.6 Meters 19920724 19920729 NH4 Ammonium Producer defined 0.1 10.4 µg-at/L 19920724 19920729 NO2 Nitrite Producer defined 0.1 4.1 µg-at/L 19920724 19920729 NO2+NO3 Nitrite+Nitrate Producer defined 0.1 12.7 µg-at/L 19920724 19920729 NO3 Nitrate Producer defined 0 12.4 µg-at/L 19920724 19920729 PO4 Phosphate Producer defined 0.1 2.9 µg-at/L 19920724 19920729 SiO3 Silicate Producer defined 0.5 62.7 µg-at/L 19920724 19920729 Sta Station name of location sampled Producer defined Character field 19920724 19920729 StnID Station identification number Producer defined 1233 1303 Integer 19920724 19920729 S792Pigment The table lists values for station mean chlorophyll a, Fo/Fa ratio, mean phaeopigment and total pigment values at depths. There are 217 records. None. Depth 0 = bucket surface sample. Mid-water = depth of SeaBird p-sensor in meters. Bottom water = depth of Hydrolab p-sensor in meters. Midas = approximately 3 meters. Producer defined Character field. 19920724 19920729 MeanC Mean Chlorophyll a Producer defined 0 31.46 µg/L 19920724 19920729 MeanF Mean Fo/Fa ratio Producer defined 0.58 5.92 FoFa ratio 19920724 19920729 MeanP Mean Phaeopigments Producer defined 0 70.36 µg/L 19920724 19920729 Sta Station name of location sampled Producer defined Character field 19920724 19920729 StnID Station identification number Producer defined 1233 1303 Integer 19920724 19920729 Total Total pigments Producer defined 0.33 70.36 µg/L 19920724 19920729 S792Stns The table lists values for station, date, fathometer, latitude, longitude, Secchi disk, time of Seabird cast, time of Hydrolab cast and station ID. There are 71 records. None. Date Date station was sampled. Producer defined. 19920724 19920729 YYYYMMDD 19920724 19920729 Fath Estimated total depth of station from ship's fathometer, with addition of constant hull depth. Producer defined 6 52 meters 19920724 19920729 Latitude Latitude of sampling station. Producer defined. 28.3913 29.5116 Decimal degrees 19920724 19920729 -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. -93.422 -89.4748 Decimal degrees 19920724 19920729 -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. Producer defined. 1 14 meters 19920724 19920729 Sta Station name of location sampled. Producer defined. Character field 19920724 19920729 StnID Station identification number. Producer defined. 1233 1303 Integer 19920724 19920729 TimeHL Time of beginning of HydroLab CTD cast. Producer defined 1:01 23:27 HH:mm 19920724 19920729 TimeSB Time of beginning of SeaBird CTD cast. Producer defined. 0:40 23:15 HH:mm 19920724 19920729 S792SuspSed The table lists values for station, depth, suspended sediments and station ID. There are 90 records. None. Depth 0 = bucket surface sample. Mid-water = depth of SeaBird p-sensor in meters. Bottom water = depth of Hydrolab p-sensor in meters. M = approximately 3 meters. Producer defined 0 29.34 meters Character field. 19920724 19920728 Sta Station name of location sampled. Producer defined. Character field. 19920724 19920728 StnID Station identification number. Producer defined. 1233 1296 Integer 19920724 19920728 SuspSed Total suspended sediments Producer defined 2.2 300 mg/L 19920724 19920728 S792Hydrolab The table lists values for Hydrolab CTD station specific conductance, density sigma-t, pH, dissolved oxygen, percent oxygen saturation, salinity and temperature values at depths. There are 489 records. None. Density Density sigma-t Producer defined. 8.18 25.8 Density sigma-t 19920724 19920729 Depth Depth of Hydrolab pressure sensor. Producer defined. 0.3 52.6 meters 19920724 19920729 O2 Dissolved Oxygen Producer defined. 0.02 9.68 mg/L 19920724 19920729 PctO2Sat Percent oxygen saturation Producer defined. 0.2 143.1 percentage 19920724 19920729 pH pH Producer defined. 7.54 8.62 pH units 19920724 19920729 Sal Salinity Producer defined. 16.5 36.9 ppt 19920724 19920729 spCond Specific Conductance. Producer defined. 26.9 55.5 mS/cm 19920724 19920729 Sta Name of station sampled. Producer defined. Character field. 19920724 19920729 StnID Station identification number. Producer defined. 1233 1303 Integer 19920724 19920729 Temp Temperature. Producer defined. 20.44 31.39 Degrees Centigrade. 19920724 19920729 The related data tables S792Hydrolab, S792Nutrient, S792Pigment, S792Seabird. S792Stns and S792SuspSed contain spatial, temporal, physical and biological water quality data acquired during the July 1992 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. 0.608 3-1/2 inch floppy disk DOS Copy S792.mdb Contact Distributor. None Call, email or write the Distributor with requests for data sets. None. Contact distributor 20020520 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