Rabalais, N., 1989, Louisiana Coastal Hypoxia Shelfwide Survey, July 1987.
This is a Point data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.0001. Longitudes are given to the nearest 0.0001. Latitude and longitude values are specified in Degrees and decimal minutes.
The horizontal datum used is WGS84.
The ellipsoid used is WGS84.
The semi-major axis of the ellipsoid used is 6378137.
The flattening of the ellipsoid used is 1/298.257223563.
| Range of values | |
|---|---|
| Minimum: | 29.73 |
| Maximum: | 56.62 |
| Units: | mmho/cm |
| Range of values | |
|---|---|
| Minimum: | 8.85 |
| Maximum: | 25.92 |
| Units: | Density sigma-t |
| Range of values | |
|---|---|
| Minimum: | 0.4 |
| Maximum: | 63.1 |
| Units: | Meters |
| Range of values | |
|---|---|
| Minimum: | 0.28 |
| Maximum: | 13.51 |
| Units: | mg/L |
| Range of values | |
|---|---|
| Minimum: | 4.2 |
| Maximum: | 205.2 |
| Units: | Percent |
| Range of values | |
|---|---|
| Minimum: | 17.09 |
| Maximum: | 36.42 |
| Units: | ppt |
Character field
| Range of values | |
|---|---|
| Minimum: | 592 |
| Maximum: | 654 |
| Units: | Integer |
| Range of values | |
|---|---|
| Minimum: | 19.34 |
| Maximum: | 30.87 |
| Units: | Degrees centigrade |
| Range of values | |
|---|---|
| Minimum: | 0.4 |
| Maximum: | 63.1 |
| Units: | Meters |
| Range of values | |
|---|---|
| Minimum: | 0.2 |
| Maximum: | 12.5 |
| Units: | µg-at/L |
| Range of values | |
|---|---|
| Minimum: | 0.1 |
| Maximum: | 9.8 |
| Units: | µg-at/L |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 34.5 |
| Units: | µg-at/L |
| Range of values | |
|---|---|
| Minimum: | 0.1 |
| Maximum: | 2.7 |
| Units: | µg-at/L |
| Range of values | |
|---|---|
| Minimum: | 0.1 |
| Maximum: | 4.5 |
| Units: | µg-at/L |
Character field
| Range of values | |
|---|---|
| Minimum: | 592 |
| Maximum: | 645 |
| Units: | Integer |
| Range of values | |
|---|---|
| Minimum: | 0.4 |
| Maximum: | 63.1 |
| Units: | Meters |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 40.2 |
| Units: | µg/L |
| Range of values | |
|---|---|
| Minimum: | 0.2 |
| Maximum: | 9.7 |
| Units: | FoFa ratio |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 37.5 |
| Units: | µg/L |
Character field
| Range of values | |
|---|---|
| Minimum: | 592 |
| Maximum: | 654 |
| Units: | Integer |
| Range of values | |
|---|---|
| Minimum: | 19870701 |
| Maximum: | 19870705 |
| Units: | YYYYMMDD |
| Range of values | |
|---|---|
| Minimum: | 28.5833 |
| Maximum: | 29.6417 |
| Units: | Decimal degrees |
| Range of values | |
|---|---|
| Minimum: | -93.6283 |
| Maximum: | -89.475 |
| Units: | Decimal degrees |
| Range of values | |
|---|---|
| Minimum: | 0.8 |
| Maximum: | 10.5 |
| Units: | meters |
Character field
| Range of values | |
|---|---|
| Minimum: | 592 |
| Maximum: | 654 |
| Units: | Integer |
| Range of values | |
|---|---|
| Minimum: | 0:10 |
| Maximum: | 23:03 |
| Units: | HH:mm |
How to obtain this tool:
Whom to contact for more information:
Tom Oswald
110 Coastal Studies Coastal Ecology Institute LSU
Baton Rouge, LA 70803
225 388-6700 (voice)
Unknown
How to obtain this tool:
Whom to contact for more information:
Turner Designs Inc.
845 W. Maude Avenue
Sunnyvale, CA 94085
US
877 316-8049 (voice)
How to obtain this tool:
Whom to contact for more information:
Sea-Bird Electronics, Inc.
1808 136th Place NE
Bellevue, WA 98005
USA
425 643-9866 (voice)
seabird@seabird.com
How to obtain this tool:
Whom to contact for more information:
Sea-Bird Electronics, Inc.
1808 136th Place NE
Bellevue, WA 98005
USA
425 643-9866 (voice)
seabird@seabird.com
How to obtain this tool:
Whom to contact for more information:
Sea-Bird Electronics, Inc.
1808 136th Place NE
Bellevue, WA 98005
USA
425 643-9866 (voice)
seabird@seabird.com
How to obtain this tool:
Whom to contact for more information:
Sea-Bird Electronics, Inc.
1808 136th Place NE
Bellevue, WA 98005
USA
425 643-9866 (voice)
seabird@seabird.com
How to obtain this tool:
Whom to contact for more information:
Sea-Bird Electronics, Inc.
1808 136th Place NE
Bellevue, WA 98005
USA
425 643-9866 (voice)
seabird@seabird.com
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 the Louisiana Sea Grant Program and by the Louisiana Universities Marine Consortium.
Nancy N. Rabalais
Louisiana Universities Marine Consortium
Louisiana Universities Marine Consortium 8124 Hwy 56
Chauvin, LA 70344
USA
985 851 2800 (voice)
985 851 2874 (FAX)
Unknown
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.
Water for chlorophyll analyses was collected from surface and bottom waters in 5 liter Niskin bottles.
Stations were occupied along ten generally North-South transects across the Louisiana coastal shelf and into Texas waters. 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). 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.
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.
A SeaBird 911 CTD was used to collect hydrographic data.
The CTD unit was mounted on a rosette sampler fitted with eleven 5-liter Niskin bottles for recovering water samples at discrete depths and a horizontally mounted Niskin bottle that triggered upon contact with the bottom. Selected samples for dissolved oxygen analysis were collected from surface and bottom waters.
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).
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.
S787Hydro: Temperature, dissolved oxygen, percent oxygen saturation, conductivity, salinity, density and depth were acquired with a SeaBird (91105/11105) CTD system that was used to obtain water column profiles at all stations. Water samples were collected to check the conductivity sensor against water of a known salinity. No correction was necessary for the conductivity measurements. 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).
S787Nutrient: Nutrient analyses were conducted by Tom Oswald under the supervision of R. E. Turner.
S787Pigment: 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. 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 S787Hydro, S787Nutrient, S787Pigment and S787Stns.
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.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- 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
Louisiana Universities Marine Consortium 8124 Hwy 56
Chauvin, LA 70344
USA
985 851 2800 (voice)
985 851 2874 (FAX)
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.
| Data format: | MDB (version 9) Size: 0.36 |
|---|---|
| Media you can order: |
3-1/2 inch floppy disk
(format DOS Copy)
|
Call, email or write the Distributor with requests for data sets.
Contact distributor
Ben Cole
Louisiana Universities Marine Consortium
LUMCON 8124 Hwy 24
Chauvin, LA 70344
USA
985 851 2800 (voice)
985 851 2874 (FAX)
Unknown