Rabalais, N. Unknown Database Hydrographic data were collected during a July 24 - 30, 1993 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. 19930724 Unknown 19930730 Unknown ground condition Complete As needed Louisiana coastal waters, Northwestern Gulf of Mexico. -93.42 -89.41 29.71 28.44 29.71 -93.42 28.44 -89.41 28.44 -93.42 29.71 -89.41 29.71 -93.42 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 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 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 A navigation device that uses a GPS (Global Positioning System) when available and LORAN (a radio navigation system operated by the U.S. Coast Guard) when GPS is not available. Contact Northstar Technologies Northstar Technologies Inc. mailing address

Northstar Technologies

Acton Mass. 01720 978-897-6600 service@northstarcmc.co Laboratory salinometer. Contact Guildline Instruments Guildline Instruments mailing address

103 Commerce Street, Suite 160

Lake Mary FL 32746 US 800-232-4536 sales@guildline.com Nutrient and Pigment bottom water samples were collected with a 30-liter bottom tripping Niskin bottle secured in a frame with a Hydrolab Surveyor 3 CTD. The data logger for the Surveyor 3 flooded mid-way through the cruise and the only available data were from hand-recorded surface and bottom values. Depth values of bottom pigment and nutrient samples based on the Surveyor 3 pressure sensor are given when available. The range of values between the station fathometer depth and the maximum Seabird CTD pressure sensor depth may be useful for extrapolation of approximate depth values for bottom nutrient and pigment samples. S793Nutrient: Nutrient analyses were conducted by Tom Oswald under the supervision of R. E. Turner S793Pigment: 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. S793Seabird: 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. Negative density sigma-t values are reported for two depths at station A'2. Data reductions from the SeaBird were generated by Ben Cole and quality controlled by Nancy Rabalais. S793Sal: Salinity determinations for surface water samples were made by on a Guildine Autosal maintained by the LSU Coastal Studies Institute shop. S793Stns: Position coordinates were logged from RV Pelican’s Loran C/GPS. Station depths were logged from the ship’s fathometer. N. Rabalais performed an additional procedure in quality-control/quality-assurance by evaluating relationships between the data in S793Nutrient, S793Pigment, S793Sal, S793Seabird and S793Stns. Unknown Unknown. Station positions were logged from RV Pelican's NorthStar LORAN C/GPS at the beginning of sampling operations. GPS when it was available, LORAN when GPS was not available. Manufacturer's LORAN accuracy claim is 30 meters 90% of the time. Manufacturer's GPS accuracy claim is 100 meters 95% of the time. Wind, currents and tidal forces may have moved the ships from the beginning positions. 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 13 generally North-South transects across the Louisiana coastal shelf. Station depths ranged from 5 to 63 meters. The objective was to delimit and describe the area of midsummer bottom dissolved oxygen less than 2 (mg/L). Due to limitations of equipment, time and funding, this was not always possible. 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 G was not reached. Field Nutrient Care was taken that the collector's hands were clean and avoided touching the water. Gloves were worn when 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 4026. All scans were processed without averaging or interpolation with a bin size of one scan. In order to improve alignment between oxygen sensor values and other CTD sensor values, the Seasoft module ALIGNCTD was used to determine which advance best compensated for the delay in oxygen sensor response time. When Seabird data were processed, dissolved oxygen was advanced relative to temperature and conductivity values: + 3.45 seconds. 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. 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 salinity 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 (when available) correspond to the deepest depth recorded from the Hydrolab (see Attribute Accuracy). 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. Field Sal Water is collected in a triple-rinsed 500ml Nalgene jar from a twice rinsed bucket of surface water. The jar lid is closed tight. The jar is stored for later analysis in the laboratory. Unknown. Unknown Unknown Point Point 84 0.0001 0.0001 Degrees and decimal minutes WGS84 WGS84 6378137 298.257223563 S793Seabird 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 2312 records. None. Cond Conductivity Producer defined 0.907694 5.641359 S/m 19930724 19930730 Density Density sigma-t Producer defined -0.2025 26.0127 Density sigma-t 19930724 19930730 Depth Depth of SeaBird pressure sensor Producer Defined 0.682 53.004 Meters 19930724 19930730 Fluor Fluormeter voltage Producer Defined Character field, generally numeric equivalent of text value except in 15 cases where ">10.0" indicates fluorometer was maximized. 0.2125 6.415 volts 19930724 19930730 O2 Dissolved oxygen Producer defined 0.061 9.339 mg/L 19930724 19930730 PctO2Sat Oxygen percent saturation Producer defined 0.9 128.9 Percent 19930724 19930730 PctXmiss Percent light transmission Producer defined. 7.4 93.2 Percent 19930724 19930730 Sal Salinity Producer defined 4.7578 36.6585 ppt 19930724 19930730 Sta Station name of location sampled Producer defined Character field 19930724 19930730 StnID Station identification number Producer defined 1605 1687 Integer 19930724 19930730 Temp Temperature Producer defined 19.2108 33.3242 Degrees centigrade 19930724 19930730 S793Nutrient The table lists values for station NH4, NO2, NO2+NO3, NO3, PO4 and SiO3 values at depths. There are 181 records. None. Depth 0 = bucket surface sample. Depth of SeaBird p sensor for mid-water samples. Depth of Hydrolab p-sensor for bottom samples. Midas = approximately 3 meters. Bot = may be extrapolated (see Attribute Accuracy). Producer defined 0.0 52.6 Meters Character field. 19930724 19930730 NH4 Ammonium Producer defined 0.2 20.4 µg-at/L 19930724 19930730 NO2 Nitrite Producer defined 0.1 6.4 µg-at/L 19930724 19930730 NO2+NO3 Nitrite+Nitrate Producer defined 0.1 150 µg-at/L 19930724 19930730 NO3 Nitrate Producer defined 0 149.1 µg-at/L 19930724 19930730 PO4 Phosphate Producer defined 0.1 5.5 µg-at/L 19930724 19930730 SiO3 Silicate Producer defined 0.3 167.7 µg-at/L 19930724 19930730 Sta Station name of location sampled Producer defined Character field 19930724 19930730 StnID Station identification number Producer defined 1604 1687 Integer 19930724 19930730 S793Pigment The table lists values for station mean chlorophyll a, Fo/Fa ratio, mean phaeopigment and total pigment values at depths. There are 264 records. None. Depth 0 = bucket surface sample. Depth of SeaBird p sensor for mid-water samples. Depth of Hydrolab p-sensor for bottom samples. Midas = approximately 3 meters. Bot = may be extrapolated (see Attribute Accuracy). Producer defined Character field. 19930724 19930730 MeanC Mean Chlorophyll a Producer defined 0.06 23.92 µg/L 19930724 19930730 MeanF Mean Fo/Fa ratio Producer defined 1 2.05 FoFa ratio 19930724 19930730 MeanP Mean Phaeopigments Producer defined 0.01 20.2 µg/L 19930724 19930730 Sta Station name of location sampled Producer defined Character field 19930724 19930730 StnID Station identification number Producer defined 1604 1687 Integer 19930724 19930730 Total Total pigments Producer defined 0.3 31.99 µg/L 19930724 19930730 S793Stns 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 84 records. None. Date Date station was sampled. Producer defined. 19930724 19930730 YYYYMMDD 19930724 19930730 Fath Estimated total depth of station from ship's fathometer, with addition of constant hull depth. Producer defined 5 53 meters 19930724 19930730 Latitude Latitude of sampling station. Producer defined. 28.45 29.7065 Decimal degrees 19930724 19930730 -9999 Latitude value was recorded from the ship's GPS or LORAN C if GPS was unavailable at the beginning of sampling operations. 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. -93.4167 -89.4193 Decimal degrees 19930724 19930730 -9999 Longitude value was recorded from the ship's GPS or LORAN C if GPS was unavailable at the beginning of sampling operations. 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. Stn J6 had a value of >13 meters. 19930724 19930730 Sta Station name of location sampled. Producer defined. Character field 19930724 19930730 StnID Station identification number. Producer defined. 1604 1687 Integer 19930724 19930730 Time Time of beginning of SeaBird CTD cast. Producer defined. 0:05 23:51 HH:mm 19930724 19930730 S793Sal The table lists values for station, depth, salinity and stationID. There are 84 records. None. Depth Depth of salinity sample. 0 = bucket sample. Producer defined. 0 0 meters 19930724 19930730 Sal Salinity. Producer defined 0.5843 30.5472 ppt 19930724 19930730 Sta Name of station sampled. Producer defined Character field. 19930724 19930730 StationID Station identification number. Producer defined 1604 1687 Integer. 19930724 19930730 The related data tables S793Nutrient, S793Pigment, S793Sal, S793Seabird and S793Stns contain spatial, temporal, physical and biological water quality data acquired during the July 1993 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. 0.576 3-1/2 inch floppy disk DOS Copy S793.mdb Contact Distributor. None Call, email or write the Distributor with requests for data sets. None. Contact distributor 20020521 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