Rabalais, N. 1989 Database Hydrographic data were collected during a July, 1986 survey of the Louisiana continental shelf. The first part of the cruise was conducted on the R/V Acadiana between July 7 and July 10. Rough seas prevented continuation on the smaller ship. The remaining stations were sampled from on board the R/V Pelican between July 16 and July 17. While not synoptic in coverage, a few mid-depth stations were reoccupied during the second leg and hydrographic conditions were similar on the two dates. 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. 19860707 Unknown 19860718 Unknown ground condition Complete As needed Louisiana coastal waters, Northwestern Gulf of Mexico. -93.6 -89.4 29.7 28.4 29.7 -93.6 28.4 -89.4 28.4 -93.6 29.7 -89.4 -29.7 -93.6 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 > 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 > 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 > 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 > 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., Wiseman Jr, W.J. and Boesch, D.F. Funding: Funds for the research were provided by the National Oceanographic and Atmospheric Administration, Ocean Assessments Division, through Louisiana Sea Grant Program and by the Louisiana Universities Marine Consortium. 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 S786HydroLab: Temperature, pH, dissolved oxygen, conductivity, salinity, and depth were measured with a Hydrolab Surveyor II Water Quality Data System at 1-, 2-, or 3-m intervals through the water column. Readings from a digital display unit were recorded on board ship. Conductivity in 25°C equivalents was converted to in situ conductivity and in situ salinity. Water samples were collected to check the conductivity sensor against water of a known salinity. A correction factor was applied as necessary for in situ salinity calculations. Selected samples for dissolved oxygen analysis were collected from surface and bottom waters and analyzed according to a modified Winkler procedure (Strickland and Parsons, 1972). Operation, maintenance, and calibration of the Hydrolab Surveyor II followed instructions provided by the Hydrolab manual (Hydrolab Corp., 1984). Yearly maintenance of the Surveyor II was performed by Hydrolab Corporation. S786Nutrient: Nutrient analyses were conducted by Tom Oswald under the supervision of R. E. Turner. S786Pigment: 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. Analysis for chlorophyll and phaeopigment concentrations followed the fluorometric methods outlined in Strickland and Parsons (1972). Pigment measurements 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 S786HydroLab, S786Nutrient, S786Pigment and S786Stns. At stations A'01 two density sigma-t values are negative. Unknown. Station positions were logged from RV Acadiana and 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 HydroLab Deployment: The HydroLab CTD was attached by chain to a lead weight. The weight was lowered to the bottom by hydrowire. With the weight on the bottom, the Hydrolab sonde was positioned just above the bottom. When the oxygen sensor stabilized, sensor values were logged. The sonde was raised in 1-, 2-, 3- or 5-m intervals through the water column. Field Pigment Water for chlorophyll analyses was collected from surface and bottom waters in 5 liter Niskin bottles. Field Station Locations Transects re-occupied stations sampled during a previous midsummer Louisiana coastal survey in 1985. Series of generally North-South transects from the mouth of the Mississippi River across the Louisiana coastal shelf and into Texas waters. Most station depths are less than 50 (m). 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 or to reach the western limit of the hypoxic water mass. Field Nutrient Water for nutrient analyses was collected from surface 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. Lab Nutrient Nitrogen and phosphorus were analyzed according to methods described in EPA publication EPA 600/4-79-020 (1979), method 350.1 was used for ammonia-N, method was used for 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 Pigment Analysis for chlorophyll and phaeopigment concentrations followed the fluorometric methods outlined in Strickland and Parsons (1972). Known volume of seawater was filtered onto a GF/F (0.7 micron) filter. Filter was fixed in 90% acetone, stored in the dark for one hour and ground with a Teflon mortar. Filtrant was read on a Turner Designs model 10 fluorometer before and after acidification with 10% Hcl. Unknown Unknown Unknown Point Point 69 0.0001 0.0001 Degrees and decimal minutes WGS84 WGS84 6378137 298.257223563 S786HydroLab The table lists Hydrolab CTD station density, dissolved oxygen, percent oxygen saturation, pH, salinity, specific conductance and temperature values at depths. There are 755 records. None. Density Density sigma-t Producer defined -2.61 25.54 Density sigma-t 19860707 19860717 Depth Depth of HydroLab pressure sensor Producer Defined 0.0 62.5 Meters 19860707 19860717 DO Dissolved oxygen Producer defined 0.13 13.20 mg/L 19860707 19860717 DOPctSat Oxygen percent saturation Producer defined 2.0 197.5 Percent 19860707 19860717 pH pH Producer defined 7.6 8.9 pH units 19860707 19860717 Sal Salinity Producer defined 2.13 36.28 ppt 19860707 19860717 SpCond Specific conductance Producer defined 4.4 57.58 mS/cm 19860707 19860717 Sta Station name of location sampled Producer defined Character field 19860707 19860717 StnID Station identification number Producer defined 455 523 Integer 19860707 19860717 Temp Temperature Producer defined 19.64 33.58 Degrees centigrade 19860707 19860717 S786Nutrient The table lists station NH4, NO2, NO2+NO3, NO3, PO4 and SiO3 values at depths. There are 130 records. None. Depth Depth of HydroLab p sensor, 0.0 depth = surface Niskin sample. Producer defined 0 62.5 Meters 19860708 19860717 NH4 Ammonium Producer defined 0.1 34.4 µg-at/L 19860708 19860717 NO2 Nitrite Producer defined 0 9.3 µg-at/L 19860708 19860717 NO3 Nitrate Producer defined 0 72.9 µg-at/L 19860708 19860717 PO4 Phosphate Producer defined 0.2 5.3 µg-at/L 19860708 19860717 SiO3 Silicate Producer defined 1.5 73.3 µg-at/L 19860708 19860717 Sta Station name of location sampled Producer defined Character field 19860708 19860717 StnID Station identification number Producer defined 455 521 Integer 19860708 19860717 S786Pigment The table lists station mean chlorophyll a, Fo/Fa ratio, and mean phaeopigment values at depths. There are 130 records. None. MeanC Mean Chlorophyll a Producer defined 0.18 55.18 µg/L 19860707 19860717 MeanF Mean Fo/Fa ratio Producer defined 1.1 3.1 FoFa ratio 19860707 19860717 MeanP Mean Phaeopigments Producer defined 0 17.44 µg/L 19860707 19860717 SampD Depth of HydroLab p sensor, 0.0 depth = Surface Niskin sample. Producer defined 0 62.5 Meters 19860707 19860717 Sta Station name of location sampled Producer defined Character field 19860707 19860717 StnID Station identification number Producer defined 455 521 Integer 19860707 19860717 S786Stns The table lists station, date, latitude, longitude, Secchi disk, time of HydroLab cast and station ID. There are 69 records. None. Date Date station was sampled. Producer defined. 19860707 19860718 YYYYMMDD 19860707 19860718 Latitude Latitude of sampling station. Producer defined. 28.4833 29.6417 Decimal degrees 19860707 19860718 -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. -93.558 -89.475 Decimal degrees 19860707 19860718 -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. Secc Secchi disk depth. Producer defined. 0.5 16 meters 19860707 19860718 Sta Station name of location sampled. Producer defined. Character field 19860707 19860718 StnID Station identification number. Producer defined. 455 523 Integer 19860707 19860718 Time Time of beginning of HydroLab CTD cast. Producer defined. 0:08 23:40 HH:mm 19860707 19860718 The related data tables S786HydroLab, S786Nutrient, S786Pigment, and S786Stns contain spatial, temporal, physical and biological water quality data acquired during the July 1986 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. 0.392 3-1/2 inch floppy disk DOS Copy S796.mdb Contact Distributor. None Call, email or write the Distributor with requests for data sets. None. Contact distributor 20020426 20020627 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