Rabalais, N.
Unknown
Louisiana Hypoxia Surveys 2002
Database
Two sets of CTD data were taken during the 2002 surveys of the Louisiana
continental shelf. Hydrographic data were obtained with the LUMCON
SeaBird 911+ CTD system and a Hydrolab Surveyor 3. Nutrient, pigment,
suspended sediment, surface salinity 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.
20020117
Unknown
20021212
Unknown
ground condition
As needed
Louisiana coastal waters, Northwestern Gulf of Mexico.
-94.2
-89.4
29.8
28.4
NASA's Global Change Master Directory. GCMD's Science Keywords and
Associated Directory Keywords
(http://gcmd.gsfc.nasa.gov/Resources/valids/index.html)
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 > Biosphere > Ecological Dynamics > Biogeochemical
Cycles
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
NASA's Global Change Master Directory. GCMD's Science Keywords and
Associated Directory Keywords
(http://gcmd.gsfc.nasa.gov/Resources/valids/index.html)
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
Data_Set_Credit Rabalais, N.N., Turner, R.E. and Wiseman, Jr., W.J.
Funding: Funds for the research were provided by the National Oceanic and
Atmospheric Administration, Coastal Ocean Program, Grant Nos. NA06OP0528
to Louisiana Universities Marine Consortium, and NA06OP0529 to Louisiana
State University.
None
Unclassified
None
Windows 2000, MSAccess 2000
H02Hydrolab: The Hydrolab Surveyor 3 Conductivity, pH and Oxygen sensors
were serviced and calibrated before deployment and maintained in
accordance with Hydrolab (http://www.hydrolab.com/) recommended
procedures. The Sonde and Logger are returned to the factory at least
annually for inspection and service.
Shipboard Winkler titrations during the July shelfwide cruise were used
to develop a regression against Hydrolab data in case it was necessary
to correct the data. Hydrolab oxygen data were corrected using an
equation based on the results of the regression.
H02Nutrients: Nutrient analyses were conducted using a QuikChem 8000
FIA+(http://www.lachatinstruments.com). Tom Oswald performed the
analyses under the supervision of R. E. Turner.
H02Pigments: The Turner Designs model 10 AU fluorometer was calibrated
for chlorophyll a against a chemical supply house chlorophyll a standard
measured on a spectrophotometer. Each time the fluorometer was moved, it
was tested with a Turner 10-AU solid standard. During cruises, the
fluorometer was blanked and calibrated daily in accordance with Turner
Designs recommended procedures. Pigment measurements were supervised by
Ben Cole or Nancy Rabalais and quality controlled by Nancy Rabalais.
H02PortaSal: Salinity samples were analyzed in the lab by Guildline
Instruments PortaSal, using Guildline methods
(http://www.guildline.ca/). Salinity analyses were conducted by Jim Lee
under the supervision of R. E. Turner.
H02Refract: The refractometer was checked with distilled water before
each cruise and re-zeroed when necessary.
H02SeaBird: Sea-Bird SBE 13-01 dissolved oxygen sensors, the
Paroscientific Digiquartz(r) pressure sensor, the SBE 3-01/F temperature
sensors, SBE 5-01 pumps, and the SBE 4-01/0 Conductivity sensors were
factory tested and calibrated at Sea-Bird (http://www.seabird.com/)
recommended intervals and maintained and serviced by RV Pelican
Electronic Technical support staff in accordance with Sea-Bird
procedures. The Sea Tech 500m Fluorometer was factory tested and
calibrated at Sea Tech recommended intervals and maintained and serviced
by RV Pelican Electronic Technical support staff in accordance with Sea
Tech procedures. Note: WET Labs acquired SEA Tech June 1, 1998,
(http://www.wetlabs.com/). The Wet Labs C Star 10 cm path
transmissometer was maintained by RV Pelican Electronic Technical
support staff in accordance with Wet Labs recommendations.
At the beginning of the monthly cruise, oxygen sensors were calibrated
using the procedures described in SeaBird APPLICATION NOTE NO. 13-1,
Rev. D. The Winkler Titration (OXFITW) oxygen value was determined
chemically from replicate samples processed using a Mettler DL21
Titrator (http://www.mt.com/).
Shipboard Winkler titrations during the July shelfwide cruise were used
to develop a regression against SeaBird data in case it was necessary to
correct the data. SeaBird oxygen data were corrected using an equation
based on the results of the regression.
During monthly surveys conducted in other months, shipboard Winkler
titrations for regressions were not made due to logistical constraints.
Fewer stations were sampled and water columns were often well mixed,
making the considerable effort involved in titrating an inefficient
allocation of resources, often without a suitable range of data to
develop a strong regression.
Winkler titrations were conducted under the supervision of Nancy
Rabalais. Data reductions from the SeaBird were generated by Ben Cole
and quality controlled by Nancy Rabalais.
H02SPM: Suspended sediment concentrations were supervised by Ben Cole or
Nancy Rabalais and quality controlled by Nancy Rabalais.
H02Stn: January though October monthly survey SeaBird times and
locations of operations were logged from RV Pelican's Multiple
Instrument Data Acquisition System (MIDAS) which was maintained by the
ship's electronic staff. Navigational data were acquired from a Starlink
(http://www.starlinkdgps.com/) differential GPS or a Trimble
(http://www.trimble.com/)GPS with a Micronet Receiver Station with sub
5-meter accuracy. Station depths were logged from the ship's Odom
Echotrac II (http://www.odomhydrographic.com/) fathometer.
November and December monthly survey station times, locations and depths
were logged from RV Acadiana's Garmin GPSMAP 168 Sounder
(http://www.garmin.com/).
In addition to the monthly surveys, Hydrolab casts were made on a few
dates from a small boat. See Horizontal_Positional_Accuracy_Report for
details.
Secchi disk depths were measured by hand using standard protocol.
N. Rabalais performed an additional procedure in
quality-control/quality-assurance by evaluating relationships between
the data in H02Hydrolab, H02Nutrients, H02Pigments, H02PortaSal,
H02Refract, H02SeaBird, H02SPM and H02Stn.
H02Hydrolab: oxygen sensor maximized at the following stations and depths:
Station A'1 0.2m and 0.8m had DO mg/L values of 99.99 and DOPctSat values
of 999.9 20021113 station C6 0.4m, 0.6m and 3.9m had DO mg/L values of
99.99 and DOPctSat values of 999.9 20021113 station C7 19.7m and 19.9m had
DO mg/L values of 99.99 and DOPctSat values of 999.9 20021113 station C8
-01m, 5.1m 18.2m, 20.0m and 21.1m had DO mg/L values of 99.99 and DOPctSat
values of 999.9 20021113 station C9 26.9m had DO mg/L values of 99.99 and
DOPctSat values of 999.9
The values reported for Dissolved Oxygen: 99.99 and Percent Oxygen
Saturation: 999.9 indicate dissolved oxygen concentrations were equal to
or higher than 20.0 mg/L and oxygen saturation was equal to or greater
than 200.0 percent.
H02SeaBird: 20020814 station C6 at 17.331, 17.469m and 20.188m has
negative OxMg/L and OxPS values.
H02SeaBird: 20020902 C6B 0.174m density is negative
When data quality criteria were not met, SPM data were not included.
NO2+NO3 values are reported for all months. Measuring individual Nitrite
and Nitrate values in nutrient samples required additional samples, sample
runs and funding. Nitrite and nitrate values were only determined for
samples collected during the July shelfwide survey.
The October 2002 cruise was the last cruise when SeaBird CTD data were
acquired because RV Pelican, in the shipyard for a midlife re-fit, was out
of service through the end of the year.
The Hydrolab CTD sustained weather related damage during the December
cruise. No data were acquired on the date 20021212.
January though October monthly survey cruise station positions were
logged from RV Pelican's differential GPS at the beginning of sampling
operations. GPS manufacturer's accuracy claim is 1-5 meters 95% of the
time. Wind, currents and tidal forces may have moved the ship from the
beginning position.
Station positions acquired during November and December on RV Acadiana
were logged from the ship's Garmin Garmin GPSMAP 168 Sounder with
Garmin GBR 21 DGPS. The manufacturer describes the accuracy to be
between 1 - 5 meters 95% of the time. Wind, currents and tidal forces
may have moved the ship from the beginning position.
In addition to the monthly surveys, Hydrolab casts were made at
stations C6B and CST52 on a few dates from a small boat using a Garmin
12XL Personal Navigator. The manufacturer describes the unit as being
accurate within 15 meters 95% of the time.
20020827 - 20020829 a series of Hydrolab casts were made at locations
in the Ship Shoal and South Timbalier areas in a small boat using a
Garmin GPS Map 182. The manufacturer describes the unit as being
accurate within 15 meters 95% of the time.
Field Hydrolab monthly C and F transect surveys
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, a data record of all the sensor
values was stored electronically. The sonde was raised in
approximately 1.0-meter increments, after D.O. sensor stabilization,
data records were stored. When the Hydrolab reached a depth of two to
three meters from the surface, The sonde was raised, and records
stored, in approximately 0.5-meter increments until finally a record
was stored with the sonde submerged but as close as possible to the
surface.
Field Hydrolab July shelfwide survey
Deployment: Due to limitations of time, mid-water depths were
generally not sampled with the Hydrolab CTD during the shelfwide
cruise.
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, a data record of all the sensor values was
stored electronically. The sonde was raised in approximately 0.5-meter
increments, after D.O. sensor stabilization, data records were stored.
After storing data for the few meters closest to the bottom, the
sonde was raised to two to three meters from the surface and a data
record was saved. The sonde was raised, and records stored, in
approximately 0.5-meter increments until finally a record was stored
with the sonde submerged but as close as possible to the surface.
Field Nutrient
Care was taken that the collector's hands were clean and avoided
touching the sample water. Gloves were worn when two 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.
Field Pigment
Water for chlorophyll analysis (30 - 100 ml) was filtered on board
ship through GF/F (0.7 micron) filters, which were then fixed in 5 ml
of DMSO/90% acetone (40/60) solution, allowed to extract for at least
two hours in the dark, then measured pre- and post-acidification on a
Turner Model 10 AU fluorometer.
Field PortaSal
Water was collected in an acid-washed, triple-rinsed 500ml Nalgene jar
from a twice-rinsed bucket of surface water. The jar lid was secured
tightly to minimize evaporation.
Field SeaBird
The SeaBird CTD number of scans to average in the deck unit was set to
one. 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 contained 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 was rapid in order to save
time.
Field SPM
Water (approximately 300 to 1000 ml) collected for suspended sediment
samples was filtered on board ship through (pre-combusted,
pre-weighed) GF/F filters and rinsed with distilled water. The filters
were placed in Petri dishes and frozen for later analysis.
Field Station Locations
C transect lies South and East of Terrebonne Bay. Nine cross-shelf
stations on C transect were sampled monthly. Additional water-column
hydrology measurements were made at stations C6B and CST52 when other
research missions provided opportunities at those locations. Seven
stations on transect F, South of the Atchafalya River were sampled in
February, April, June, August, October, and December.
During the July shelfwide cruise, stations were occupied along 16
generally North-South transects across the Louisiana and Texas coastal
shelves. Station depths ranged from 3.56 to 47.7 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 transects
A', A, E, F, G, H, I and J. The limit of hypoxia on the Southern end
of transect Q was not reached. The limit of hypoxia was not reached at
two of four stations on the Western end of the survey. The limit of
hypoxia was not reached at two of four stations on the Eastern end of
the survey.
Field water samples
Water for chlorophyll, nutrient, salinity and suspended sediment
analyses was collected from the surface by twice-rinsed bucket, from
mid-water in 5-l Niskin bottles on the SeaBird CTD/rosette system or a
messenger triggered 5-l Niskin on the Hydrolab hydrowire. Bottom
samples were collected in a 5-l bottom tripping Niskin deployed on the
Hydrolab hydrowire. Three were problems with the Hydrolab winch at
stations K7 and M7 during the shelfwide cruise and bottom water at
those locations was collected using Niskin bottles on the SeaBird
rosette.
Depth values of "0" indicate a bucket sample collected from the
surface of the water. Generally, deepest depths of water samples were
from the bottom-tripping Niskin and correspond to the deepest depth
recorded from the Hydrolab. As noted in the preceding paragraph,
bottom water sample-depths at stations K7 and M7 were the depths of
the pressure sensor reading for 5-l Niskin bottles on the SeaBird
rosette.
The SeaBird pressure sensor was located approximately 0.75 meters
below the mid-point of the 5-l Niskin.
Midwater samples at stations on C transect were collected using Niskin
bottles on the SeaBird rosette in January through October and by
messenger fired Niskin on the Hydrolab hydrowire in November.
Lab Nutrient
Ammonium samples were analyzed according to Lachat Instrument's
QuikChem method 31-107-06-1-B. Phosphates are determined by Lachat
Instrument's QuikChem Method 31-115-01-1-H. Silicates were measured
using Lachat Instrument's Method 31-114-27-1-C. TKN was determined
using Lachat Instrument's QuikChem Method 10-107-06-2-H. Nitrates and
Nitrites were determined using Lachat Instrument's Method
31-107-04-1-C.
Lab SPM
Suspended sediment filters were dried overnight at 60°C and weighed.
The filters were then combusted at 400°C for 12 hours and weighed.
The weights of the total suspended, organic and inorganic materials
were derived.
Lab SeaBird
Sea-Bird CTD data were acquired using Seasoft version 4.236 January
through March. April data were acquired using version 4.225. Version
5.25b was used to acquire data from May through October.
January through April data were processed using version 5.25. May data
per processed using version 5.25b. June through October data were
processed using version 5.26.
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, when
possible, 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 as follows: January: 3.3 seconds, February: 3.35 seconds,
March: 3.4 seconds, April: 3.25 seconds, May: 3.2 seconds, June: 3.57
seconds, July: 3.45 seconds, September: 4.3 seconds and October: 2.7
seconds.
Data values reported are from downcasts. Downcast scans selected for
each CTD station were 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.
Unknown.
Unknown
Unknown
Vector
Point
267
0.0001
0.0001
Degrees and decimal minutes
WGS84
WGS84
6378137
298.257223563
H02Hydrolab
The table lists Hydrolab CTD station identification number, record
date, station name, record time, record depth, dissolved oxygen,
temperature, specific conductance, salinity, pH, percent oxygen
saturation and density sigma-t. There are 3869 records.
Producer defined.
Date
Date when a Hydrolab record was saved. (Date can be different for
Hydrolab CTD cast and SeaBird CTD cast at same station).
Producer defined
20020117
20021211
20020117
20021211
Density
Density sigma-t
Producer defined
2.19
25.37
Density sigma-t
20020117
20021211
Depth
Depth of Hydrolab pressure sensor
Producer Defined
0
47.2
Meters
20020117
20021211
DO
Dissolved oxygen. N.B. The oxygen sensor maximized at two depths at
station A'1 in July and during the November cruise at one or more
depths at stations C6, C7, C8 and C9. Dissolved oxygen concentrations
at those stations were greater than or equal to 20.0 mg/L.
Producer defined
0.27
99.99
mg/L
20020117
20021211
DOPctSat
Oxygen percent saturation. N.B. The oxygen sensor maximized at two
depths at station A'1 in July and during the November cruise at one or
more depths at stations C6, C7, C8 and C9. Oxygen saturation at those
station depths was greater than or equal to 200 percent.
Producer defined
4.1
999.9
Percent
20020117
20021211
pH
pH
Producer defined
5.87
8.75
pH units
20020117
20021211
Salin
Salinity
Producer defined
9
36.1
psu
20020117
20021211
SpCond
Specific conductance
Producer defined
15.5
54.5
mS/cm
20020117
20021211
Sta
Station name of location sampled
Producer defined
Character field
20020117
20021211
StnID
Station identification number
Producer defined
1
259
Integer
20020117
20021211
Temp
Temperature
Producer defined
10.73
33.67
Degrees centigrade
20020117
20021211
Time
Time when Hydrolab record was saved
Producer defined.
00:00:29
23:59:54
HH:mm:ss
20020117
20021211
H02Nutrient
The table lists station vial number, NH4, NO2, NO2+NO3, NO3, PO4 and
SiO3 values at depths. There are 541 records.
Producer defined.
Depth
0.0 depth = bucket sample. Mid-water sample depths were generally
depths of SeaBird pressure sensor. Bottom sample depths were generally
depths of Hydrolab pressure sensor. (See Methodology_Type Field water
samples for exceptions).
Producer defined
0
47.2
Meters
20020117
20021212
NH4
Ammonium
Producer defined
0.2
48.2
µM
20020117
20021212
NO2
Nitrite
Producer defined
0.2
8
µM
20020117
20021212
NO2+NO3
Nitrite + Nitrate
Producer defined
0.1
157.1
µM
20020117
20021212
NO3
Nitrate
Producer defined
0
156.4
µM
20020117
20021212
PO4
Phosphate
Producer defined
0.2
5.2
µM
20020117
20021212
SiO3
Silicate
Producer defined
0.1
72.7
µM
20020117
20021212
Sta
Station name of location sampled
Producer defined
Character field
20020117
20021211
StnID
Station identification number
Producer defined
1
268
Integer
20020117
20021212
H02Pigments
The table lists sample depth, mean chlorophyll a, Fo/Fa ratio, mean
phaeopigments, station name and station identification number and mean
total pigments. There are 467 records.
Producer defined.
Depth
0.0 depth = bucket sample. Mid-water sample depths were generally
depths of SeaBird pressure sensor. Bottom sample depths were generally
depths of Hydrolab pressure sensor. (See Methodology_Type Field water
samples for exceptions).
Producer defined
0
47.2
Meters
20020117
20021212
MeanC
Mean Chlorophyll a
Producer defined
0
50.44
µg/L
20020117
20021212
MeanF
Mean Fo/Fa ratio. F(original), F(acidified).
Producer defined
0.5
2.11
FoFa ratio
20020117
20021212
MeanP
Mean Phaeopigments
Producer defined
0
95.65
µg/L
20020117
20021212
Sta
Station name of location sampled
Producer defined
Character field
20020117
20021212
StnID
Station identification number
Producer defined
1
268
Integer
20020117
20021212
Total
Total pigments
Producer defined
0.13
95.65
µg/L
20020117
20021212
H02PortaSal
The table lists sample depth and sample salinity (psu), station name
and station identification number of values measured using a Guildline
Instruments PortaSal. There are 333 records.
Producer defined.
Depth
Bottom sample depths were generally depths of Hydrolab pressure
sensor. (See Methodology_Type Field water samples for exceptions). 0.0
depth = bucket sample.
Producer defined
0
39.5
Meters
20020117
20021212
PortaSal
Salinity
Producer defined.
3.424
36.598
psu
20020117
20021212
Sta
Station name of location sampled
Producer defined
Character field
20020117
20021212
StnID
Station identification number.
Producer defined
1
268
Integer
20020117
20021212
H02Refract
The table lists sample date, sample Aquafauna refractometer salinity,
sample MIDAS (SeaBird SBE 21 Thermosalinograph) salinity and station
identification number of values measured. There are 5 records.
Producer defined.
Refract
Salinity measured with a refractometer.
Producer defined.
3
21
Parts per thousand
20020721
20020721
Sal-M
Salinity as logged from RV Pelicans MIDAS output.
Producer defined
9.66
19.2
20020721
20020721
Sta
Station name of location sampled
Producer defined
Character field
20020721
20020721
StnID
Station identification number.
Producer defined
86
90
Integer
20020721
20020721
H02SeaBird
The table lists SeaBird CTD conductivity, depth, FlS (SeaTech
fluorometer voltage), dissolved oxygen, oxygen percent saturation,
salinity, density sigma-t, station name, station identification
number, temperature and light transmissivity. There are 4418 records.
Producer defined.
COS/m
Conductivity
Producer defined.
0.047937
5.993675
S/m
20020117
20021021
DepS
Depth of SeaBird pressure sensor.
Producer defined.
0.348
47.091
Meters
20020117
20021021
FlS
in vivo fluorescence. SeaTech fluorometer voltage. N.B. 15 is the
maximum value for the instrument. Values of 15 indicate in vivo
fluorescence was equal to or greater than what the instrument
measured. Values of 15 at one or more depths were measured in January
at stations C7, C6, C6B, C5, C4, C3, and C1. In March 15 was measured
at stations C3 and C1. During May at station C1 and June at station C3
and C1 15 was measured. On the shelfwide survey in July at stations
A'1, C5, D0, F0 and I2 had at least one FlS record value with a value
of 15.
Producer defined.
0.013431
15
Voltage
20020117
20021021
OxMg/L
Dissolved oxygen
Producer defined.
-0.10896
12.69866
mg/L
20020117
20021021
OxPS
Percent oxygen saturation.
Producer defined.
-1.72238
157.11082
Percent
20020117
20021021
Sal00
Salinity
Producer defined.
11.4118
36.5325
psu
20020117
20021021
Sigma-t00
Density sigma-t
Producer defined.
3.6498
25.5599
sigma-t
20020117
20021021
Sta
Station name of location sampled.
Producer defined.
Character field
20020117
20021021
StnID
Station identification number.
Producer defined.
1
241
Integer
20020117
20021021
T090C
Water Temperature
Producer defined.
12.1881
33.1094
Degrees centigrade
20020117
20021021
Xmiss
Percent light transmission
Producer defined.
0.3552
98.5604
Percent
20020117
20021021
H02SPM
The table lists values for inorganic, organic and total suspended
particulate material, station name and station identification number.
There are 232 records.
Producer defined.
InOrgSPM
Inorganic suspended particulate material.
Producer defined.
0.9
53.3
20020117
20021212
OrgSPM
Organic suspended particulate material.
Producer defined.
0.4
16
mg/L
20020117
20021212
Sta
Station name of location sampled.
Producer defined.
Character field
20020117
20021212
StnID
Station identification number.
Producer defined
1
268
Integer
20020117
20021212
TotalSPM
Total suspended sediments.
Producer defined
2.1
69.3
mg/L
20020117
20021212
H02Stn
The table lists altimeter height, date, fathometer depth, latitude,
longitude, secchi disk depth, station name, station identification
number, time of Hydrolab CTD cast and time of SeaBird CTD cast. There
are 267 records.
Producer defined.
Alt
Height of SeaBird CTD package above the bottom.
Producer defined.
0.7
2.5
Meters
20020117
20021212
Date
Date samples were collected at station. (Date may be different for
Hydrolab CTD cast and SeaBird CTD cast at same station).
Producer defined.
20020117
20021212
20020117
20021212
Fath
Depth of Station as measured by ship's fathometer, corrected for hull
depth.
Producer defined.
3.56
47.77
Meters
20020117
20021212
Lat
Latitude of sampling station.
Producer defined.
28.4828
29.7052
Decimal degrees.
20020117
20021212
-9999
Latitude value was recorded from the ship's differential GPS at the
beginning of sampling operations. GPS manufacturer's accuracy claims
range from 1 to 15 meters 95% of the time. Wind, currents and tidal
forces may move the ship from the beginning position. Survey vessel
was not anchored during sampling on July shelfwide cruise. Vessel
was only occasionally anchored or tied to an oilfield structure
during other monthly cruises. 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.
Lon
Longitude of sampling station.
Producer defined.
-94.1067
-89.325
Decimal degrees.
20020117
20021212
-9999
Longitude value was recorded from the ship's differential GPS at the
beginning of sampling operations. GPS manufacturer's accuracy claims
range from 1 to 15 meters 95% of the time. Wind, currents and tidal
forces may move the ship from the beginning position. Survey vessel
was not anchored during sampling on July shelfwide cruise. Vessel
was only occasionally anchored or tied to an oilfield structure
during other monthly cruises. 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.
0.2
25.0
Meters
20020117
20021212
Sta
Station name of location sampled.
Producer defined.
Character field
20020117
20021212
StnID
Station identification number.
Producer defined.
1
268
Integer
20020117
20021212
TimeHL
Time of beginning of Hydrolab CTD cast as well as time of Pigment,
PortaSal and Nutrient samples.
Producer defined.
00:02:27
23:59:54
HH:mm:ss
20020117
20021211
TimeSB
Time of beginning of SeaBird CTD cast.
Producer defined.
00:26
23:54
HH:mm
20020117
20021021
The related data tables H02Hydrolab, H02Nutrients, H02Pigment,
H02PortaSal, H02Refract, H02SeaBird, H02SPM, and H02Stn contain spatial,
temporal, physical and biological water quality data acquired during the
2002 Hypoxia Surveys of the Louisiana coastal waters. Each table
contains a StnID field that can be used to key joins with other tables.
For detailed attribute information contact 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
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.
0.816
3-1/2 inch floppy disk or CDROM
DOS Copy
LAHS2002.mdb
Contact Distributor.
None
Call or write the Distributor with requests for data sets.
Contact distributor
20030605
20030615
20130615
Ben Cole or Adam Sapp
Louisiana Universities Marine Consortium
mailing address
LUMCON, 8124 Hwy 56
Chauvin
LA
70344
USA
985 851 2800
985 851 2874
Unknown
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time