Scanfish data from dye injection studies on Georges Bank from R/V Oceanus cruise OC342 in 1999 as part of the U.S. GLOBEC program (GB project)

Website: https://www.bco-dmo.org/dataset/2420
Version: 1
Version Date: 2006-03-28

Project
» U.S. GLOBEC Georges Bank (GB)

Program
» U.S. GLOBal ocean ECosystems dynamics (U.S. GLOBEC)
ContributorsAffiliationRole
Houghton, Robert W.Lamont-Doherty Earth Observatory (LDEO)Principal Investigator
Allison, DickyWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Abstract
Scanfish data from dye injection studies on Georges Bank from R/V Oceanus cruise OC342 in 1999 as part of the U.S. GLOBEC program.


Coverage

Spatial Extent: N:42.15668 E:-66.51578 S:40.91682 W:-67.63352
Temporal Extent: 1999 - 1999

Dataset Description

Dye Experiment Study of Cross-Frontal Exchange, R/V Oceanus Cruise 342
DMO notes:
The documentation below describes a two ship operation. The data reported here are from the Bob Houghton cruise on the Oceanus 342.

PI documentation:
Two cruises were undertaken in May and June 1999 in which dye patches were released to study cross-frontal exchange. On Oceanus Cruise 342, led by Bob Houghton of LDEO, dye was released in the bottom mixed layer. A Scanfish towed unit was used to moniter the dispersion of dye as well as locate the frontal system on the Southern flank of Georges Bank. Jim Ledwell and Jim Churchill of WHOI led Endeavor Cruise 323/324 in which dye and drifters were deployed in the pycnocline and in the surface layer. Sampling on this cruise was done by the WHOI VPR group, yielding plankton distributions.

Figure 1 shows the location of dye and drifter deployments during these cruises. The LDEO dye was Fluorescein injected into the bottom mixed layer on the stratified side of the tidal front. The WHOI dye was Rhodamine-WT: #1 injected into the surface (1-3 m ) layer and #2-4 into the pycnocline. During the WHOI dye injections additional WHOI drifters drogued at various depths were deployed in the dye patch. Drifters also drogued at various depths were deployed by Manning in April and May on NOAA cruises. See the time line for the temporal distribution of the experiments.

Additional information about this experiment is available at the on-line report entitled Distribution of Salinity on the Cap of Georges Bank

The work is described in more detail in the following cruise reports:

Houghton, R. W., R/V Oceanus Cruise 342 to Georges Bank, Cruise Report, U. S. GLOBEC Northwest Atlantic/Georges Bank Program, 1999.

Ledwell, J. R., T. G. Donoghue, C. J. Sellers, J. H. Churchill, D. Torres, D. McGillicuddy, V. Kosnyrev, C. S. Davis, S. M. Gallager, C. J. Ashjian, A. P. Girard, P. Alatalo, and Q. Hu, Lagrangian Studies of the Tidal Mixing Front on Georges Bank, R/V Endeavor Cruises 323 and 324, Cruise Report, U. S. GLOBEC Northwest Atlantic/Georges Bank Program, 2000.

McGillicuddy, D. J., and V. K. Kosnyrev, Real-Time Modeling on Cruises EN323 and EN324, Cruise Report, U. S. GLOBEC Northwest Atlantic/Georges Bank Program, 1999.

Questions concerning these data should be directed to:
Bob Houghton
Lamont-Doherty Earth Observatory of Columbia Univ. 202 Oceanography
Palisades, NY 10964
Phone: 845-365-8328
E-mail: houghton@ldeo.columbia.edu

Last updated March 28, 2006


Methods & Sampling

On Oceanus Cruise 342, led by Bob Houghton of LDEO, dye was released in the bottom mixed layer. A Scanfish towed unit was used to moniter the dispersion of dye as well as locate the frontal system on the Southern flank of Georges Bank. Jim Ledwell and Jim Churchill of WHOI led Endeavor Cruise 323/324 in which dye and drifters were deployed in the pycnocline and in the surface layer. Sampling on this cruise was done by the WHOI VPR group, yielding plankton distributions.

Figure 1 shows the location of dye and drifter deployments during these cruises. The LDEO dye was Fluorescein injected into the bottom mixed layer on the stratified side of the tidal front. The WHOI dye was Rhodamine-WT: #1 injected into the surface (1-3 m ) layer and #2-4 into the pycnocline. During the WHOI dye injections additional WHOI drifters drogued at various depths were deployed in the dye patch. Drifters also drogued at various depths were deployed by Manning in April and May on NOAA cruises. See the time line for the temporal distribution of the experiments.


Data Processing Description

Additional information about this experiment is available at the on-line report entitled Distribution of Salinity on the Cap of Georges Bank


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Data Files

File
dye_bh.csv
(Comma Separated Values (.csv), 49.99 MB)
MD5:4593f1754ac2c1f24787bfff06a4e9f9
Primary data file for dataset ID 2420

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Parameters

ParameterDescriptionUnits
cruiseid

cruise identification

year

Year of cruise, 4 digit year

injection

dye injection number

survey

survey number

line

Line number

yrday_gmt

Year day based on Julian Calendar, year day 1.5 = Jan 1 at 1200 hrs

YYY.Y
lat

latitude, negative = South

DD.D
lon

longitude, negative = West

DD.D
press

depth of sample reported as pressure

decibars
temp

water temperature

Deg. C
sal

salinity, PSU

dimensionless
sigma_t

density

kg/m<sup>3</sub>
flvolt

fluorescence, from CTD mounted fluorometer

volts
dye

dye amount

kg of water/kg of dye * 10<sup>11</sup>


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Instruments

Dataset-specific Instrument Name
Drifter Buoy
Generic Instrument Name
Drifter Buoy
Dataset-specific Description
Drifter buoy to include the Beardsley Drifter (BDFT)
Generic Instrument Description
Drifting buoys are free drifting platforms with a float or buoy that keep the drifter at the surface and underwater sails or socks that catch the current. These instruments sit at the surface of the ocean and are transported via near-surface ocean currents. They are not fixed to the ocean bottom, therefore they "drift" with the currents. For this reason, these instruments are referred to as drifters, or drifting buoys. The surface float contains sensors that measure different parameters, such as sea surface temperature, barometric pressure, salinity, wave height, etc. Data collected from these sensors are transmitted to satellites passing overhead, which are then relayed to land-based data centers. definition sources: https://mmisw.org/ont/ioos/platform/drifting_buoy and https://www.aoml.noaa.gov/phod/gdp/faq.php#drifter1

Dataset-specific Instrument Name
Scanfish
Generic Instrument Name
Scanfish
Dataset-specific Description
Towed vehicle provided by the University of Rhode Island. Scanfish towed unit was used to moniter the dispersion of dye
Generic Instrument Description
The Scanfish is a remotely operated, towed, undulating vehicle system designed for collecting 3D profile data of the water column. It includes a Conductivity, Temperature, Depth (CTD) profiler as part of the instrument package. The Scanfish housing has fins to allow it to dive and rise, an altimeter to determine the depth of the unit, a pump that moves water through the system and a data cable that reports data back to the ship as the fish is being towed through the water behind the vessel. The Scanfish can be configured with additional sensors, e.g. fluorometer.


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Deployments

OC342

Website
Platform
R/V Oceanus
Report
Start Date
1999-05-20
End Date
1999-06-07
Description
process

Methods & Sampling
On Oceanus Cruise 342, led by Bob Houghton of LDEO, dye was released in the bottom mixed layer. A Scanfish towed unit was used to moniter the dispersion of dye as well as locate the frontal system on the Southern flank of Georges Bank. Jim Ledwell and Jim Churchill of WHOI led Endeavor Cruise 323/324 in which dye and drifters were deployed in the pycnocline and in the surface layer. Sampling on this cruise was done by the WHOI VPR group, yielding plankton distributions.   Figure 1 shows the location of dye and drifter deployments during these cruises. The LDEO dye was Fluorescein injected into the bottom mixed layer on the stratified side of the tidal front. The WHOI dye was Rhodamine-WT: #1 injected into the surface (1-3 m ) layer and #2-4 into the pycnocline. During the WHOI dye injections additional WHOI drifters drogued at various depths were deployed in the dye patch. Drifters also drogued at various depths were deployed by Manning in April and May on NOAA cruises. See the time line for the temporal distribution of the experiments.

Processing Description
Additional information about this experiment is available at the on-line report entitled http://globec.whoi.edu/globec-dir/reports/data_workshops/cross-frontal_e... Distribution of Salinity on the Cap of Georges Bank


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Project Information

U.S. GLOBEC Georges Bank (GB)


Coverage: Georges Bank, Gulf of Maine, Northwest Atlantic Ocean


The U.S. GLOBEC Georges Bank Program is a large multi- disciplinary multi-year oceanographic effort. The proximate goal is to understand the population dynamics of key species on the Bank - Cod, Haddock, and two species of zooplankton (Calanus finmarchicus and Pseudocalanus) - in terms of their coupling to the physical environment and in terms of their predators and prey. The ultimate goal is to be able to predict changes in the distribution and abundance of these species as a result of changes in their physical and biotic environment as well as to anticipate how their populations might respond to climate change.

The effort is substantial, requiring broad-scale surveys of the entire Bank, and process studies which focus both on the links between the target species and their physical environment, and the determination of fundamental aspects of these species' life history (birth rates, growth rates, death rates, etc).

Equally important are the modelling efforts that are ongoing which seek to provide realistic predictions of the flow field and which utilize the life history information to produce an integrated view of the dynamics of the populations.

The U.S. GLOBEC Georges Bank Executive Committee (EXCO) provides program leadership and effective communication with the funding agencies.



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Program Information

U.S. GLOBal ocean ECosystems dynamics (U.S. GLOBEC)


Coverage: Global


U.S. GLOBEC (GLOBal ocean ECosystems dynamics) is a research program organized by oceanographers and fisheries scientists to address the question of how global climate change may affect the abundance and production of animals in the sea.

The U.S. GLOBEC Program currently had major research efforts underway in the Georges Bank / Northwest Atlantic Region, and the Northeast Pacific (with components in the California Current and in the Coastal Gulf of Alaska). U.S. GLOBEC was a major contributor to International GLOBEC efforts in the Southern Ocean and Western Antarctic Peninsula (WAP).



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Funding

Funding SourceAward
National Oceanic and Atmospheric Administration (NOAA)
NSF Division of Ocean Sciences (NSF OCE)

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