Rabalais, N.
Unknown
Louisiana Hypoxia Surveys 1999
Database
Two sets of CTD data were taken during the 1999 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.
19990106
Unknown
19991207
Unknown
ground condition
As needed
Louisiana coastal waters, Northwestern Gulf of Mexico.
-93.7
-89.4
29.8
28.2
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 > 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
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 Oceanic and Atmospheric
Administration, Coastal Ocean Program, Grant Nos. NA86RG0341 and
NA960P0112. Funds for rental of the R/V PELICAN for monthly transect C
cruises were provided by National Science Foundation Grant No. OCE-9818985
to Q. Dortch, Louisiana Universities Marine Consortium. The PELICAN was
supported by the NOAA grants for the summer shelfwide cruise.
None
Unclassified
None
Windows 2000, MSAccess 2000
H99Hydrolab: 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.
H99Nutrient: Nutrient analyses were conducted using a Technicon
(http://www.techniconinstruments.com/) autoanalyzer by Tom Oswald under
the supervision of R. E. Turner.
H99Pigment: The Turner Designs model 10 and model 10 AU fluorometers
were calibrated for chlorophyll a against a chemical supply house
chlorophyll a standard measured on a spectrophotometer yearly. During
cruises, the fluorometer was blanked and calibrated daily in accordance
with Turner Designs recommended procedures. Beginning in June 1999, a
Turner Designs model 10 AU replaced the model 10. Each time the model
10 AU was moved, it was tested with a Turner 10-AU solid standard.
Pigment measurements were supervised and quality controlled by Nancy
Rabalais.
H99SeaBird: 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 WetStar fluorometer was
maintained in accordance with Wet Labs recommendations by RV Pelican
Electronic Technical support staff. The Chelsea Fluorometer was also
maintained by RV Pelican Electronic Technical support staff in
accordance with Chelsea recommended procedures
(http://www.chelsea.co.uk/).
For the months January - June and August, the calibration of the
SeaBird oxygen sensors was accomplished as follows. A large tub of clean
seawater was mixed and aerated for 24 hours. The Sea-Bird CTD package
was placed in the oxygen-saturated water bath for the next hour. The
Hydrolab CTD, freshly calibrated, was also placed in the bath. Both CTD
systems were powered up. The SeaBird Deck unit and Hydrolab logger were
observed. Time for sensor equilibration was allowed.
The manufacturers stated +/- 0.2mg/L as the error allowance for both
SeaBird and Hydrolab oxygen sensors. SeaBird and Hydrolab oxygen values
were compared.
If the sensors agreed within 0.4mg/L, no further action was taken. If
sensor values were more than 0.4mg/L apart, The Hydrolab value was used
for the "W" value and the SeaBird oxygen sensor was calibrated using the
procedure described in Seabird APPLICATION NOTE NO. 13-1, Rev. D.
At the beginning of the July shelfwide 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 cruise were used to develop a regression against CTD data.
Winkler titrations and the OXFITW procedure were used to check the
SeaBird oxygen sensors at the beginning of the September - December
cruises.
The September and October cruises were made on RV Acadiana. On those
cruises, the General Oceanics CTD rosette was not used and a SeaBird
SeaCat CTD was used instead of the SeaBird 911+ CTD used on Pelican
cruises. A pumped Sea-Bird SBE 13-01 dissolved oxygen sensor was
employed on each of the September and October cruises. The September
configuration file was used during the October cruise because it gave
better post-calibration results than an October calibration adjustment
attempt.
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.
H99Stn: Times and locations of operations were acquired 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.
The Secchi disk depths were measured by hand using standard protocol.
During the September and October cruises on the RV Acadiana, RV
Pelican's Starlink and Trimble GPS units were transferred to Acadiana.
Position data were logged from the Starlink and Trimble GPS units.
Station depths were logged from Acadiana's fathometer.
H99PortaSal: The samples were analyzed in the lab by Guildline
Instruments PortaSal, using Guildine methods (http://www.guildline.ca/).
Salinity analyses were conducted by Jim Lee under the supervision of R.
E. Turner.
H99MIDAS: Suspended sediment concentrations were supervised and quality
controlled by Nancy Rabalais. Times and locations of operations were
acquired from the ships MIDAS system (described above in H99Stn).
N. Rabalais performed an additional procedure in
quality-control/quality-assurance by evaluating relationships between
the data in H99PortaSal, H99Hydrolab, H99Nutrient, H99Pigment, H99Stn
and H99MIDAS.
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. A suitable range of data could not be acquired to
develop a strong regression.
Hydrolab data were derived from a pre- and post-calibrated instrument.
Therefore, there is often disagreement between SeaBird and Hydrolab oxygen
values. It is the opinion of the PI, Nancy Rabalais, that the Hydrolab
data for the monthly cruises are the more reliable data.
For the July SeaBird data, Winkler titrations were used to develop a
regression which was used to correct the SeaBird oxygen data if necessary.
The data for the SeaBird and the Hydrolab compare better for the
shelfwide July cruise.
There were problems with the SeaBird CTD plumbing configuration, software
configuration, pump and deck unit failure during the February 2nd cruise.
Oxygen data values were considered to be unreasonably high. Oxygen data
were not included in the dataset because they were considered unreliable.
August 24th Hydrolab data were not acquired due to a battery problem.
SeaBird FlC (fluorescence Chelsea), FlS (Fluorescence Sea-Tech) and Xmiss
(transmission percent) data were not acquired during the September 14th
and October 12th surveys on RV Acadiana because of the reduced number of
instruments in the SeaCat CTD package.
November 4th station C9 Seabird oxygen data were not included because the
oxygen sensor failed.
All station positions, except those acquired during the September and
October cruises on RV Acadiana, 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 move the ship from the beginning
position.
Station positions acquired during the September and October cruises on
RV Acadiana were logged from the ship's NorthStar 800 LORANC. The
manufacturer describes the accuracy to be within 30 meters 90% of the
time.
On the following dates hydrocasts were made from a small boat tied to
the oilfield platform at station C6B: 19990301, 19990322, 19990428,
19990513, 19990520, 19990603, 19990624, 19990712, 19990730, 19990818
and 19990907.
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 is rapid in order to save
time.
Field Hydrolab C Transect
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 was raised 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 shelfwide
Deployment: Due to limitations of time and funding, 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
Hydrolab 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 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 fluorometer. Beginning in June 1999, a Turner Model 10
AU was used to measure the samples.
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 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 station C6B when other research
missions provided opportunities at that location.
During the July shelfwide cruise, stations were occupied along 14
generally North-South transects across the Louisiana coastal shelf.
Station depths ranged from 4.6 to 61.8 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 nine
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 ends of all transects, except
transect J, was reached. The limit of hypoxia was not reached at
station M3 on the western end of the survey. The limit of hypoxia was
not reached at stations A'1, A'2 and A'3 on the eastern end of the
survey.
Field Nutrient
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 SPM
Water (approximately 300 to 1000 ml) collected for suspended sediment
samples 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.
Field water samples
Water for chlorophyll, nutrient analyses and PortaSal salinity 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 deployed on the Hydrolab hydrowire.
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.
Water for Suspended Sediment samples was collected by tapping into
discharge of the shipâ€(tm)s seawater flow through system MIDAS. MIDAS
intake was 2 -3 meters below the surface. The watch chief observed
MIDAS navigational data, when distance to station was 0.3 miles, a
triple-rinsed jar (1000ml) was collected from the silicon MIDAS
discharge tube in the ship's bottle lab. Finally, collection time was
logged.
Lab SPM
Suspended sediment filters were dried 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.
Lab Nutrient
Nitrogen and phosphorus are 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 is analyzed according to Technicon Industrial method 186-72
W/B (1977).
Lab SeaBird
Sea-Bird CTD data were acquired using Seasoft version 4.225 in all
months except September and October when version 4.217 was used. Data
were post processed using Seasoft version 4.225. 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,
November and December +4.25 seconds; March, April, May, June and
August +4.5 seconds; July +4.333 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
201
0.0001
0.0001
Degrees and decimal minutes
WGS84
WGS84
6378137
298.257223563
H99Hydrolab
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 2827 records.
Producer defined
Date
Date when Hydrolab record was saved. (Date can be different for
suspended sediment, Hydrolab CTD cast and SeaBird CTD cast at same
station).
Producer defined
19990106
19991207
19990106
19991207
Density
Density sigma-t
Producer defined
7.93
25.09
Density sigma-t
19990106
19991207
Depth
Depth of Hydrolab pressure sensor
Producer Defined
0.0
63.2
Meters
19990106
19991207
DO
Dissolved oxygen
Producer defined
0.04
16.93
mg/L
19990106
19991207
DOPctSat
Oxygen percent saturation
Producer defined
0.7
194.4
Percent
19990106
19991207
pH
pH
Producer defined
7.5
8.76
pH units
19990106
19991207
Salin
Salinity
Producer defined
16.2
36.5
psu
19990106
19991207
SpCond
Specific conductance
Producer defined
26.6
55
mS/cm
19990106
19991207
Sta
Station name of location sampled
Producer defined
Character field
19990106
19991207
StnID
Station identification number
Producer defined
7
365
Integer
19990106
19991207
Temp
Temperature
Producer defined
12.49
32.41
Degrees centigrade
19990106
19991207
Time
Time when Hydrolab record was saved
Producer defined.
00:06:28
23:58:16
HH:mm:ss
19990106
19991207
H99MIDAS
The table lists sample date, Latitude, longitude, salinity, suspended
sediments, station name, station identification number and sample
time. Date, time, salinity and position data were collected from the
survey vessel's MIDAS (Multi-Input_Data-Acquisition-System). There are
118 records.
Latitude and Longitude values listed in table H99MIDAS are more
precise positions for suspended sediment samples. See also: suspended
sediment section of field water sample Methodology.
Producer defined.
Date
Date when the SPM (suspended sediment) sample was collected from the
survey ship's MIDAS.
Producer defined.
19990106
19991207
19990106
19991207
Latitude
Latitude of sampling station.
Producer defined.
28.3921
29.7052
Decimal degrees
19990106
19991207
-9999
Latitude value was recorded from the ship's differential GPS when
suspended sediment sample was collected. 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. 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.
-93.6539
-89.414
Decimal degrees
19990106
19991207
-9999
Longitude value was recorded from the ship's differential GPS when
suspended sediment sample was collected. 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. 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.
SalM
Salinity as measured by RV Pelican's SeaBird SBE 21 Thermosalinograph
in the flow-through seawater component of the ship's MIDAS system. NB
September and October 1999 salinities were measured with a SeaBird
SeaCat in a similarly configured system on RV Acadiana.
Producer defined.
2.38
35.67
PSU
19990106
19991207
SPM
Total suspended sediments collected by tapping into the flow-through
seawater component of the ship's MIDAS system. September and October
1999 SPM samples were collected from twice-rinsed buckets of surface
water. There are 188 records.
Producer defined
1.62
60
mg/L
19990106
19991207
Sta
Station name of location sampled.
Producer defined.
Character field
19990106
19991207
StnID
Station identification number.
Producer defined
2
356
Integer
19990106
19991207
TimeM
Time when SPM sample was collected
Producer defined
0:11:21
23:50:05
Hours:minutes:seconds
19990106
19991207
H99Nutrient
The table lists station vial number, NH4, NO2, NO2+NO3, NO3, PO4 and
SiO3 values at depths. There are 398 records.
Producer defined.
Depth
Bottom sample depths are depths of Hydrolab p sensor, 0.0 depth =
bucket sample. Samples at 6.5m and 14.0m and the bottom sample at
Station C9 8/24/99 were collected using Niskin bottles on the SeaBird
rosette.
Producer defined
0
63.2
Meters
19990106
19991207
NH4
Ammonium
Producer defined
0.1
45
µg-at/L
19990106
19991207
NO2
Nitrite
Producer defined
0.1
12.6
µg-at/L
19990106
19991207
NO2+NO3
Nitrite + Nitrate
Producer defined
0.2
117
µg-at/L
19990106
19991207
NO3
Nitrate
Producer defined
0
116
µg-at/L
19990106
19991207
PO4
Phosphate
Producer defined
0.1
6.5
µg-at/L
19990106
19991207
SiO3
Silicate
Producer defined
0.3
120.4
µg-at/L
19990106
19991207
Sta
Station name of location sampled
Producer defined
Character field
19990106
19991207
StnID
Station identification number
Producer defined
2
356
Integer
19990106
19991207
Vial
Number identifying vial in which sample was collected.
Producer defined
1
221
Integer
19990106
19991207
H99Pigment
The table lists sample date, sample depth, mean chlorophyll a, Fo/Fa
ratio, mean phaeopigments, mean total pigments, station name and
station identification number. There are 398 records.
Producer defined.
Date
Date station was sampled.
Producer defined.
19990106
19991207
19990106
19991207
Depth
Depth of Hydrolab p sensor, 0.0 depth = bucket sample. 6.5m and 14m
samples and the bottom sample at station C9 8/24/99 were collected
using Niskin bottles on the Seabird rosette.
Producer defined
0
63.2
Meters
19990106
19991207
MeanC
Mean Chlorophyll a
Producer defined
0
54.88
µg/L
19990106
19991207
MeanF
Mean Fo/Fa ratio. F(original), F(acidified).
Producer defined
0.46
2.06
Fo/Fa ratio
19990106
19991207
MeanP
Mean Phaeopigments
Producer defined
0
151.8
µg/L
19990106
19991207
Sta
Station name of location sampled
Producer defined
Character field
19990106
19991207
StnID
Station identification number
Producer defined
2
356
Integer
19990106
19991207
Total
Total pigments
Producer defined
0.39
151.8
µg/L
19990106
19991207
H99PortaSal
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 229 records.
Producer defined.
Depth
Depth of Hydrolab p sensor, 0.0 depth = bucket sample. The bottom
sample at station C9 8/24/99 was collected using Niskin bottles on the
SeaBird rosette.
Producer defined
0
30.1
Meters
19990106
19991207
PortaSal
Salinity
Producer defined.
2.07
36.315
psu
19990106
19991207
Sta
Station name of location sampled
Producer defined
Character field
19990106
19901207
StnID
Station identification number.
Producer defined
2
356
Integer
19990106
19991207
H99SeaBird
The table lists SeaBird CTD conductivity, depth, FlC (Chelsea
fluorometer voltage), FlS (SeaTech fluorometer voltage), dissolved
oxygen, oxygen percent saturation, salinity, density sigma-t, station
name, station identification number, temperature, WetStar fluorometer
voltage and light transmissivity. There are 3493 records.
Producer defined.
COS/m
Conductivity
Producer defined.
2.618123
5.957732
S/m
19990106
19991207
DepS
Depth of SeaBird pressure sensor.
Producer defined.
0.328
61.584
Meters
19990106
19991207
FlC
in vivo fluorescence. Chelsea fluorometer voltage.
Producer defined.
-0.01019
7.285
Voltage
19990106
19991207
FlS
in vivo fluorescence. SeaTech fluorometer voltage. N.B. 30 is the
maximum value for the instrument. Values of 30 indicate in vivo
fluorescence was equal to or greater than what the instrument
measured.
Producer defined.
0.3346
30
Voltage
19990106
19991207
OxMg/L
Dissolved oxygen
Producer defined.
-0.00886
14.55184
mg/L
19990106
19991207
OxPS
Percent oxygen saturation.
Producer defined.
-0.1302
191.5108
Percent
19990106
19991207
Sal00
Salinity
Producer defined.
16.2414
36.2044
psu
19990106
19991207
Sigma-t00
Density sigma-t
Producer defined.
7.7476
25.2665
sigma-t
19990106
19991207
Sta
Station name of location sampled.
Producer defined.
Character field
19990106
19991207
StnID
Station identification number.
Producer defined.
7
356
Integer
19990106
19991207
T068
Water Temperature
Producer defined.
12.0932
33.1086
Degrees centigrade
19990106
19991207
WetStar
In vivo fluorescence. WetStar fluorometer voltage.
Producer defined.
1.8445
13.7357
Voltage
19990914
19991012
Xmiss
Percent light transmission
Producer defined.
0.13
102.39
Percent
19990106
19991207
H99Stn
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 201 records.
Producer defined.
Alt
Height of SeaBird CTD package above the bottom.
Producer defined.
1
5
Feet
19990106
19991207
Date
Date samples were collected at station. (Date may be different for SPM
sample, Hydrolab CTD cast and SeaBird CTD cast at same station).
Producer defined.
19990106
19991207
19990106
19991207
Fath
Depth of Station as measured by ship's fathometer, corrected for hull
depth.
Producer defined.
4.6
61.8
Meters
19990106
19991207
Latitude
Latitude of sampling station.
Producer defined.
28.3915
29.706
Decimal degrees.
19990106
19991207
-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.
Longitude
Longitude of sampling station.
Producer defined.
-93.6535
-89.4758
Decimal degrees.
19990106
19991207
-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.
Secc
Secchi disk depth.
Producer defined.
0.2
16
meters
19990106
19991207
Sta
Station name of location sampled.
Producer defined.
Character field
19990106
19991207
StnID
Station identification number.
Producer defined.
2
356
Integer
19990106
19991207
TimeHL
Time of beginning of Hydrolab CTD cast as well as time of Pigment,
PortaSal and Nutrient samples.
Producer defined.
00:06:28
23:53:27
HH:mm:ss
19990106
19991207
TimeSB
Time of beginning of Seabird CTD cast.
Producer defined.
00:15
23:55
HH:mm
19990106
19991207
The related data tables H99Hydrolab, H99MIDAS, H99Nutrient, H99Pigment,
H99PortaSal and H99SeaBird contain spatial, temporal, physical and
biological water quality data acquired during the 1999 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
LAHS1999.mdb
Contact Distributor.
None
Call or write the Distributor with requests for data sets.
Contact distributor.
None.
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