Rabalais, N. Unknown Database Hydrographic data were collected during a July 23 - 28, 1996 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. 19960723 Unknown 19960728 Unknown ground condition Complete As needed Louisiana coastal waters, Northwestern Gulf of Mexico. -93.42 -89.42 29.7 28.4 29.7 -93.42 28.4 -89.42 28.4 -93.42 29.7 -89.42 29.7 -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 > 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 > 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 CTD Contact HydroLab Corporation Hydrolab Corporation mailing address

8700 Cameron Road

Austin TX 78754 US 800-949-3766 techsupport@hydrolab.com Portable salinometer Contact Guildine Instruments Guildline Instruments mailing address

103 Commerce Street, Suite 160

Lake Mary FL 32746 US 800-232-4536 sales@guildline.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 Fathometer Contact Odom Hydrographic Systems, Inc. Odom Hydrographic Systems, Inc. mailing address

1450 Seaboard Ave

Baton Rouge LA 70810 USA 225 769-3051 email@odomhydrographic.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 Differential Global Positioning System Contact Starlink Inc. Starlink Incorporated mailing address

500 Center Ridge Drive, Suite 600

Austin TX 78753 US 512 454-5511 S796Hydrolab: The dissolved oxygen sensor of the Hydrolab Surveyor 3 was pre- and post-calibrated using air saturated water concentrations and barometric pressure from a laboratory grade barometer. Conductivity and pH were pre- and post-calibrated with the appropriate solutions. S796Nutrient: Nutrient analyses were conducted by Tom Oswald under the supervision of R. E. Turner. S796Pigment: 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. S796Seabird: Sea-Bird factory calibrated conductivity and temperature sensors were maintained and serviced in accordance with to Sea-Bird recommended procedures. The Sea Tech fluorometer and transmissometer were maintained and serviced in accordance with Sea Tech recommended procedures. Sea-Bird dissolved oxygen sensor was maintained and serviced in accordance with Sea-Bird recommended procedures. Two oxygen sensors were used on the Sea-Bird CTD. In the early part of the cruise (stations A'1, A'2, A'3 and A7), D.O. sensor 1 was connected to a pump. Due to equipment problems, no data were collected at A'4 and A'5. Beginning with station A6 and continuing throughout the cruise, sensor 1 was removed from the pumped circuit and replaced with sensor 2. The station B4 data file was damaged and unusable. Oxygen data for stations A'1 and A7 were deleted because the values were unrealistic. Oxygen data for stations A'2 and A'3 were left in the data table but should be considered suspect. Oxygen data values reported in the Seabird table were acquired with sensor 2. 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 on board ship were used to develop a regression against Sea-Bird oxygen data, which were corrected if necessary. A correction was not needed because there was good agreement of Sea-Bird oxygen values with Winkler values and bottom values obtained with the Hydrolab CTD. Data reductions from the SeaBird were generated by Ben Cole and quality controlled by Nancy Rabalais. S796Stns: Depths were logged from the RV Pelican’s fathometer. S795SalSed: Suspended sediment concentrations were supervised and quality controlled by Nancy Rabalais. Salinity determinations were made with a Guildine Portasal maintained by the LSU Coastal Studies shop. N. Rabalais performed an additional procedure in quality-control/quality-assurance by evaluating relationships between the data in S796Hydrolab, S796Nutrient, S796Pigment, S796SalSed, S796Seabird and S796Stns. Maximum Sea-Bird CTD depth values exceeded fathometer values at nine stations. Maximum Hydrolab CTD depth values exceeded fathometer values at twenty-two stations. In most cases, the difference was less than a meter. Ship's movement between times when values were recorded may have caused the variation. Unknown. Station positions were logged from RV Pelican’s DGPS at the beginning of sampling operations. Manufacturer's DGPS accuracy claim is 1-5 meters 95% of the time. Wind, currents and tidal forces may have moved the ship from the beginning positions. Field Pigment Water for chlorophyll analysis (30 - 100 ml) was 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 Field station locations: Stations were occupied along 13 generally North-South transects across the Louisiana coastal shelf. Station depths ranged from 5.9 to 57.7 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 ten 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 all transect was 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 4.217. 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: + 4.5 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- or 0.2-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, Portasal salinity and suspended sediments was collected from the surface by twice-rinsed bucket, from mid-water in 5-l Niskin bottles on the Seabird CTD/rosette system and from bottom in a 5-l bottom tripping Niskin bottle secured in a frame with the Hydrolab Surveyor 3. Depth values of 0 indicate 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 Seabird rosette. The Seabird p-sensor was located approx. 1 meter below the mid-point of the 5-l Niskin. Bottom 5-l Niskins on the rosette were used to collect “bottom” water samples at stations A7, A6, B1, B2, B6, B8, C7, C6B, C4, D1, E2, E2A and F3. 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. Field CTD At the beginning of each hydrocast the entire CTD/Rosette package was soaked while submerged 0.5m to 1.0m below the surface until pump flow and oxygen values observed via the Sea-Bird deck unit indicated the system was operating correctly. In order to minimize the effect of delays in oxygen sensor response time caused by temperature, sensor condition and plumbing configuration, the CTD package was lowered as close to dead slow as possible. The sensor packages were located below the Niskin bottles and rosette. At stations where the watch chief deemed the structure of the oxygen profile contains features useful in post-processing the oxygen data (AlignCTD), the CTD package was raised at the same speed it was lowered. At all other stations, the upcast is rapid in order to save time. Unknown. Unknown Unknown Point Point 80 0.0001 0.0001 Degrees and decimal minutes WGS84 WGS84 6378137 298.257223563 S796Seabird 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 2049 records. None. Cond Conductivity Producer defined 2.01699 5.752614 S/m 19960723 19960728 Density Density sigma-t Producer defined 3.7848 26.1716 Density sigma-t 19960723 19960728 Depth Depth of SeaBird pressure sensor Producer Defined 1.025 49.318 Meters 19960723 19960728 Fluor Fluorometer voltage Producer Defined Character field, generally numeric equivalent of text value except in 15 cases where ">10.0" indicates fluorometer was maximized. 0.725 6.786 volts 19960723 19960728 O2 Dissolved oxygen. Producer defined 0.00603 8.27343 mg/L 19960723 19960728 PctO2Sat Oxygen percent saturation Producer defined 0.1 207.9 Percent 19960723 19960728 PctXmiss Percent light transmission Producer defined. 17.4 96.3 Percent 19960723 19960728 Sal Salinity Producer defined 10.8604 36.455 ppt 19960723 19960728 Sta Station name of location sampled Producer defined Character field 19960723 19960728 StnID Station identification number Producer defined 2254 2331 Integer 19960723 19960728 Temp Temperature Producer defined 18.0927 32.211 Degrees centigrade 19960723 19960728 S796Nutrient The table lists values for station NH4, NO2, NO2+NO3, NO3, PO4 and SiO3 values at depths. There are 157 records. None. Depth 0 = bucket surface sample. Deepest depths of samples were from bottom tripping Niskin and correspond to the deepest depth recorded from the Hydrolab CTD pressures sensor. Other depths indicate the pressure sensor reading for 5 liter Niskin on the Sea-Bird CTD/rosette. The Sea-Bird pressure sensor was located 1 meter below mid point of Niskin bottles on the rosette. Producer defined 0 51.3 Meters 19960723 19960728 NH4 Ammonium Producer defined 0.2 19.2 µg-at/L 19960723 19960728 NO2 Nitrite Producer defined 0.1 10.1 µg-at/L 19960723 19960728 NO2+NO3 Nitrite+Nitrate Producer defined 0.2 222.2 µg-at/L 19960723 19960728 NO3 Nitrate Producer defined 0 221.6 µg-at/L 19960723 19960728 PO4 Phosphate Producer defined 0.1 4.3 µg-at/L 19960723 19960728 SiO3 Silicate Producer defined 0.9 107.8 µg-at/L 19960723 19960728 Sta Station name of location sampled Producer defined Character field 19960723 19960728 StnID Station identification number Producer defined 2252 2331 Integer 19960723 19960728 S796Pigment The table lists values for station mean chlorophyll a, Fo/Fa ratio, mean phaeopigment and total pigment values at depths. There are 158 records. None. Depth 0 = bucket surface sample. Deepest depths of samples were from bottom tripping Niskin and correspond to the deepest depth recorded from the Hydrolab CTD pressures sensor. Other depths indicate the pressure sensor reading for 5 liter Niskin on the Sea-Bird CTD/rosette. The Sea-Bird pressure sensor was located 1 meter below mid point of Niskin bottles on the rosette. Producer defined 0 51.3 meter 19960723 19960728 MeanC Mean Chlorophyll a Producer defined 0 40.86 µg/L 19960723 19960728 MeanF Mean Fo/Fa ratio Producer defined 0.88 2.08 FoFa ratio 19960723 19960728 MeanP Mean Phaeopigments Producer defined 0.03 20.69 µg/L 19960723 19960728 Sta Station name of location sampled Producer defined Character field 19960723 19960728 StnID Station identification number Producer defined 2252 2331 Integer 19960723 19960728 Total Total pigments Producer defined 0.39 45.48 µg/L 19960723 19960728 S796Stns The table lists values for station, date, fathometer, latitude, longitude, Secchi disk, times of Seabird and Hydrolab casts and station ID. There are 80 records. The times stations R1 and R2 were occupied are listed in the TimeHL field. None. Date Date station was sampled. Producer defined. 19960723 19960728 YYYYMMDD 19960723 19960728 Fath Estimated total depth of station from ship's fathometer, with addition of constant distance from the transducer to the sea surface. Producer defined 5.9 57.7 meter 19960723 19960728 Latitude Latitude of sampling station. Producer defined. 28.3919 29.7067 Decimal degrees 19960723 19960728 -9999 Latitude value was recorded from a digital GPS at the beginning of sampling operations. Wind, currents and tidal forces can 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. -93.4165 -89.4294 Decimal degrees 19960723 19960728 -9999 Longitude value was recorded from a digital GPS at the beginning of sampling operations. Wind, currents and tidal forces can 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. 0.4 12.6 meter 19960723 19960728 Sta Station name of location sampled. Producer defined. Character field 19960723 19960728 StnID Station identification number. Producer defined. 2252 2332 Integer 19960723 19960728 TimeHL Time (Central Daylight) of beginning of HydroLab cast. Producer defined. 0:028:36 23:56:00 HH:mm:ss 19960723 19960728 TimeSB Time (Central Daylight) at beginning of Sea-Bird CTD cast. Producer defined 0:14 23:42 HH:mm 19960723 19960728 S796SalSed The table lists values for station, depth, suspended sediments and station ID. There are 79 records. None. Depth 0 = bucket surface sample. Producer defined. 0 0 meters Character field. 19960723 19960728 PortaSal Salinity Producer defined 3.323 32.622 ppt 19960723 19960728 Sta Station name of location sampled. Producer defined. Character field. 19960723 19960728 StnID Station identification number. Producer defined. 2252 2331 Integer 19960723 19960728 SuspSed Total suspended sediments Producer defined. 5.75 50.8 mg/L 19960723 19960728 S796Hydrolab 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 704 records. None. Density Density sigma-t Producer defined. 3.3 26.07 Density sigma-t 19960723 19960728 Depth Depth of Hydrolab pressure sensor. Producer defined. 0.1 58.5 meters 19960723 19960728 O2 Dissolved Oxygen Producer defined. 0.02 11.03 mg/L 19960723 19960728 PctO2Sat Percent oxygen saturation Producer defined. 0.4 162.6 percentage 19960723 19960728 pH pH Producer defined. 7.44 8.61 pH units 19960723 19960728 Sal Salinity Producer defined. 10.2 36.6 ppt 19960723 19960728 spCond Specific Conductance. Producer defined. 17.4 55.2 mS/cm 19960723 19960728 Sta Name of station sampled. Producer defined. Character field. 19960723 19960728 StnID Station identification number. Producer defined. 2254 2331 Integer 19960723 19960728 Temp Temperature. Producer defined. 18.4 32.13 Degrees Centigrade. 19960723 19960728 The related data tables S796Hydrolab, S796Nutrient, S796Pigment, S796SalSed, S796Seabird and S796Stns contain spatial, temporal, physical and biological water quality data acquired during the July 1995 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. 0.656 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 20020605 20020702 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