Rabalais, N.
Unknown
Louisiana Hypoxia Surveys 2001
Database
Two sets of CTD data were taken during the 2001 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.
20010103
Unknown
20011215
Unknown
ground condition
As needed
-94.1
-89.4
29.8
28.3
Louisiana coastal waters, Northwestern Gulf of Mexico.
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
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
H01Hydrolab: 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.
There were sporadic problems with the Hydrolab conductivity sensor
fluctuations in January, April, May and June. Small adjustments based on
correlations with Portasal and SeaBird values were made to selected
Hydrolab salinity data. Salinity data considered unreliable were
deleted.
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.
H01Nutrients: January through October nutrient analyses were conducted
using a Technicon (http://www.techniconinstruments.com/) autoanalyzer.
November and December analyses were conducted using a
(http://www.lachatinstruments.com) QuikChem 8000 FIA+. Tom Oswald
performed the analyses under the supervision of R. E. Turner.
H01Pigments: 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.
H01PortaSal: 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.
H01Refract: The refractometer was checked with distilled water before
each cruise and re-zeroed when necessary.
H01SeaBird: 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 and Sea Tech 5.0 cm
Transmissometer were 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 each 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/).
On the cruises in January, March, April, October, November and December
the water column at most stations was well mixed. Shipboard Winkler
titrations for regressions were not considered useful (not enough data
range to develop a strong regression) and were not made.
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. The Seabird data agreed with the Winkler values and no
correction was necessary.
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.
H01SPM: Suspended sediment concentrations were supervised by Ben Cole or
Nancy Rabalais and quality controlled by Nancy Rabalais.
H01Stn: January, March, April, July, October, November and December
monthly survey 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.
February, May, June, August and September 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 H01Hydrolab, H01Nutrients, H01Pigments, H01PortaSal,
H01Refract, H01SeaBird, H01SPM and H01Stn.
Hydrolab oxygen sensor maximized at 0.2m depth at station A'2, 20010720.
The values reported for Dissolved Oxygen: 99.99 and Percent Oxygen
Saturation: 999.9 indicate oxygen levels were equal to or higher than 20.0
mg/L and 200 percent saturation.
The fluorometer in the SeaBird CTD package had maximum value of 15.
Fluorometer values of 15 were observed at twenty-seven stations. See FlS
entity Detailed_Description for details.
The maximum fathometer depth (Fath) reported in table H01Stn is 52.4
meters. The maximum depth pressure sensor depth (DepS) reported in table
H01Hydrolab is 52.6 meters.
Beginning with the October survey, the transmissometer used with the
SeaBird CTD was changed from a SeaTech transmissometer to a Wet Labs
transmissometer.
When data quality criteria were not met, SPM data were not included.
Conductivity, salinity and density values at one or more depths were
deleted from thirty-seven stations because the data were not considered
reliable.
Nutrients analytical instruments and methods changed in November 2001.
Beginning November 2001, nitrites and nitrates were not reported
separately.
The SeaBird transmissometer was not functional at station C1 on the
January survey. The transmissometer was not functional at any of stations
surveyed in November.
The electronic data file for station C5 on the date 20010721 was not
archived. The results reported in the table H01SeaBird came from a SeaBird
MRK file created when Niskin bottles were fired. The parameter OxPS
(percent oxygen saturation) was not recorded in the MRK file.
January, March, April, July, October, November and December 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 February, May, June, August and
September on RV Acadiana were logged from the ship's Garmin Garmin
GPSMAP 168 Sounder with 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.
Hydrocasts were made from Whiskey Pass, a small boat, on the following
dates: 20010618, 20010706, 20010823, 20010906, 20010906, 20010924,
20010924 and 20011113. The boat tied up to oilfield platforms at
stations C6B or CST52.
Unknown.
Unknown
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 January through October
Care was taken that the collector's hands were clean and avoided
touching the sample 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.
Field Nutrient November through December
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 (except January and
December). Additional water-column hydrology measurements were made at
station C6B when other research missions provided opportunities at
that location. Seven stations on transect F, South of the Atchafalya
River were sampled in January, March, May, September November and
December.
During the July shelfwide cruise, stations were occupied along 15
generally North-South transects across the Louisiana coastal shelf.
Station depths ranged from 3.25 to 52.4 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, B,
E, F, H and I. The limit of hypoxia on the southern end of transect P
was not reached. The limit of hypoxia was not reached at three of 5
stations on the western end of the survey. The limit of hypoxia was
not reached at three of five 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. During the shelfwide cruise because of funding and
time constraints bottom samples at station H6, stations 1, 2, 5, 6 and
7 on transect I and all stations on transects J, K, M and P were
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 on transects J, K, M and P and station H6
and five station on transect I 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.
Samples at 6.5m and 14.0m at Station C6B were collected using Niskin
bottles on the SeaBird rosette in January, March, April, July,
October, November and December. 6.5m and 14m at Station C6B were
collected using a messenger fired Niskin on the Hydrolab hydrowire in
the months February, May, June, August and September.
Lab Nutrient January through October.
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 Nutrient November and December
Ammonia samples were analyzed according to Lachat Instrument's
QickChem method 31-107-06-1-B. Phosphates are determined by Lachat
Instrument's QuickChem 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 QuickChem Method 10-107-06-2-H. Nitrate and
Nitrite 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 April data were post-processed with Seasoft version 4.247.
July through December data were post-processed with Seasoft version
4.249. 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: February 3 seconds, March 3.125 seconds, April 3.5
seconds, July 2.9 seconds, October 3 seconds, November 3.3 seconds,
December 3.375 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
Vector
Point
254
0.0001
0.0001
Degrees and decimal minutes
WGS84
WGS84
6378137
298.257223563
H01Hydrolab
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 3566 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
20010103
20011215
20010103
20011215
Density
Density sigma-t
Producer defined
5.96
26.31
Density sigma-t
20010103
20011215
Depth
Depth of Hydrolab pressure sensor
Producer Defined
0.0
52.6
Meters
20010103
20011215
DO
Dissolved oxygen. N.B. The oxygen sensor was maximized at the 0.2m
depth at station A'2. Dissolved oxygen concentration at station A'2
was greater than or equal to 20.0 mg/L.
Producer defined
0.02
99.99
mg/L
20010103
20011215
DOPctSat
Oxygen percent saturation. N.B. The oxygen sensor was maximized at
the 0.2m depth at station A'2. Oxygen saturation at station A'1 was
greater than or equal to 200 percent.
Producer defined
0.3
999.9
Percent
20010103
20011215
pH
pH
Producer defined
7.61
8.77
pH units
20010103
20011215
Salin
Salinity
Producer defined
13
37
psu
20010103
20011215
SpCond
Specific conductance
Producer defined
21.7
55.6
mS/cm
20010103
20011215
Sta
Station name of location sampled
Producer defined
Character field
20010103
20011215
StnID
Station identification number
Producer defined
1
255
Integer
20010103
20011215
Temp
Temperature
Producer defined
5.91
31.74
Degrees centigrade
20010103
20011215
Time
Time when Hydrolab record was saved
Producer defined.
00:27:14
23:57:44
HH:mm:ss
20010103
20011215
H01Nutrient
The table lists station vial number, NH4, NO2, NO2+NO3, NO3, PO4 and
SiO3 values at depths. There are 491 records.
Producer defined.
Depth
Bottom and mid-water 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
52.6
Meters
20010103
20011215
NH4
Ammonium
Producer defined
0.1
29.2
µg-at/L January through October µM November and December
20010103
20011215
NO2
Nitrite
Producer defined
0.1
14.2
µg-at/L January through October µM November and December
20010103
20011215
NO2+NO3
Nitrite + Nitrate
Producer defined
0.2
155
µg-at/L January through October µM November and December
20010103
20011215
NO3
Nitrate
Producer defined
0
146.7
µg-at/L January through October µM November and December
20010103
20011215
PO4
Phosphate
Producer defined
0.1
5
µg-at/L January through October µM November and December
20010103
20011215
SiO3
Silicate
Producer defined
0.2
138.8
µg-at/L January through October µM November and December
20010103
20011215
Sta
Station name of location sampled
Producer defined
Character field
20010103
20011215
StnID
Station identification number
Producer defined
1
255
Integer
20010103
20011215
H01Pigments
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 494 records.
Producer defined.
Depth
Bottom and mid-water 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
52.6
Meters
20010103
20011215
MeanC
Mean Chlorophyll a
Producer defined
0
66.44
µg/L
20010103
20011215
MeanF
Mean Fo/Fa ratio. F(original), F(acidified).
Producer defined
0.48
1.83
Fo/Fa ratio
20010103
20011215
MeanP
Mean Phaeopigments
Producer defined
0.17
73.85
µg/L
20010103
20011215
Sta
Station name of location sampled
Producer defined
Character field
20010103
20011215
StnID
Station identification number
Producer defined
1
255
Integer
20010103
20011215
Total
Total pigments
Producer defined
0.17
74.28
µg/L
20010103
20011215
H01PortaSal
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 360 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
39.3
Meters
20010103
20011215
PortaSal
Salinity
Producer defined.
1.651
36.686
psu
20010103
20011215
Sta
Station name of location sampled
Producer defined
Character field
20010103
20011215
StnID
Station identification number.
Producer defined
1
255
Integer
20010103
20011215
H01Refract
The table lists sample date, sample salinity and station
identification number of values measured using an Aquafauna
refractometer. There are 5 records.
Producer defined.
Refract
Salinity measured with a refractometer.
Producer defined.
0
16
Parts per thousand
20010720
20010720
StnID
Station identification number.
Producer defined
83
87
Integer
20010720
20010720
TimeMIDAS
Time sample was collected as logged from RV Pelicans MIDAS GPS output.
Producer defined
09:49:00
10:56:00
20010720
20010720
H01SeaBird
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 3901 records.
Producer defined.
COS/m
Conductivity
Producer defined.
1.528819
5.953272
S/m
20010103
20011215
DepS
Depth of SeaBird pressure sensor.
Producer defined.
0.542
51.835
Meters
20010103
20011215
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. Stations A'2, A'1, C3, C1, D1N, D1, D0, F1 and I4 had at
least one FlS record value with a value of 15.
Producer defined.
0.117
15
Voltage
20010103
20011215
OxMg/L
Dissolved oxygen
Producer defined.
0
13.3846
mg/L
20010103
20011215
OxPS
Percent oxygen saturation.
Producer defined.
0
172.39038
Percent
20010103
20011215
Sal00
Salinity
Producer defined.
14.5033
36.6149
psu
20010103
20011215
Sigma-t00
Density sigma-t
Producer defined.
6.5447
26.201
sigma-t
20010103
20011215
Sta
Station name of location sampled.
Producer defined.
Character field
20010103
20011215
StnID
Station identification number.
Producer defined.
1
255
Integer
20010103
20011215
T068
Water Temperature
Producer defined.
5.6308
31.8283
Degrees centigrade
20010103
20011215
Xmiss
Percent light transmission
Producer defined.
2.3412
97.8442
Percent
20010103
20011215
H01SPM
The table lists values for inorganic, organic and total suspended
particulate material, station name and station identification number.
There are 225 records.
Producer defined.
InOrgSPM
Inorganic suspended particulate material.
Producer defined.
0.6
81
20010103
20011215
OrgSPM
Organic suspended particulate material.
Producer defined.
1.2
18.8
mg/L
20010103
20011215
Sta
Station name of location sampled.
Producer defined.
Character field
20010103
20011215
StnID
Station identification number.
Producer defined
1
225
Integer
20010103
20011215
TotalSPM
Total suspended sediments.
Producer defined
2.8
93
mg/L
20010103
20011215
H01Stn
The table lists altimeter height, date, fathometer depth, latitude,
longitude, MIDAS salinity, secchi disk depth, station name, station
identification number, time of Hydrolab CTD cast and time of SeaBird
CTD cast. There are 254 records.
Producer defined.
Alt
Height of SeaBird CTD package above the bottom in feet.
Producer defined.
0.8
14
Feet
20010103
20011215
Date
Date samples were collected at station. (Date may be different for
Hydrolab CTD cast and SeaBird CTD cast at same station).
Producer defined.
20010103
20011215
20010103
20011215
Fath
Depth of Station as measured by ship's fathometer, corrected for hull
depth.
Producer defined.
3.25
52.4
Meters
20010103
20011215
Lat
Latitude of sampling station.
Producer defined.
28.3922
29.7072
Decimal degrees.
20010103
20011215
-9999
Latitude value was recorded from the ship'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
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.
-94.0665
-89.4278
Decimal degrees.
20010103
20011215
-9999
Longitude value was recorded from the ship'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
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.
M-Sal
Salinity as measured by RV Pelican's SeaBird SBE 21 Thermosalinograph
in the flow-through seawater component of the ship's MIDAS system. The
seawater through-hull intake was located 3 meters below the surface.
Producer defined.
1.75
30.98
Degrees centigrade.
20010720
20010726
Secc
Secchi disk depth. (7/22/01 D5 Secc: >7.5m)
Producer defined.
0.3
16.2
Meters
20010103
20011215
Sta
Station name of location sampled.
Producer defined.
Character field
20010103
20011215
StnID
Station identification number.
Producer defined.
1
255
Integer
20010103
20011215
TimeHL
Time of beginning of Hydrolab CTD cast as well as time of Pigment,
PortaSal and Nutrient samples.
Producer defined.
00:27:14
23:50:06
HH:mm:ss
20010103
20011215
TimeSB
Time of beginning of SeaBird CTD cast.
Producer defined.
00:02
23:32
HH:mm
20010103
20011215
The related data tables H01Hydrolab, H01Nutrients, H01Pigments,
H01PortaSal, H01Refract, H01SeaBird, and H01Stn contain spatial,
temporal, physical and biological water quality data acquired during the
2001 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
LAHS2001.mdb
Contact Distributor.
None
Call or write the Distributor with requests for data sets.
Contact distributor
20030525
20030601
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