CTD data from the Gulf of Maine in 1998 from three cruises on the R/V Susan and Caitlyn - SC9801, SC9802, and SC9803 - in the Gulf of Maine and Georges Bank as part of the U.S. GLOBEC program (GB project)

Website: https://www.bco-dmo.org/dataset/2419
Data Type: Cruise Results
Version: 1
Version Date: 2005-03-16

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

Program
» U.S. GLOBal ocean ECosystems dynamics (U.S. GLOBEC)
ContributorsAffiliationRole
Bub, FrankUniversity of New Hampshire (UNH/OPAL)Co-Principal Investigator
Bucklin, AnnUniversity of New Hampshire (UNH/OPAL)Co-Principal Investigator
Manning, James P.Northeast Fisheries Science Center - Woods Hole (NOAA NEFSC)Co-Principal Investigator
Allison, DickyWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Abstract
CTD data from the Gulf of Maine in 1998 from three cruises on the R/V Susan and Caitlyn - SC9801, SC9802, and SC9803 - in the Gulf of Maine and Georges Bank as part of the U.S. GLOBEC program.


Coverage

Spatial Extent: N:43.6182 E:-69.5615 S:42.6162 W:-69.7167
Temporal Extent: 1998-02-21 - 1998-06-02

Dataset Description


The UNH SeaBird SBE-25 SeaLogger measures:

 

  • Temperature (degrees C) with a SeaBird SBE-3F.
  • Conductivity (Siemens/m) with a SeaBird SBE-4C.
  • Pressure (decibars) with a SBE 29 strain gage sensor.
  • Percent light transmission with a Wet Labs CST-126R transmissometer across a 25 cm distance at the red light wavelength 660 nm. Data are presented as a percentage relative to pure water.
  • Chlorophyll concentration in micrograms/liter with a Wet Labs WETStar Fluorometer model 9607003.
  • PAR (photosynthetically active radiation) with a Biospherical QPS-200PD which observes an upper hemispherical total irradiance in quanta/sq-cm/sec.
  • Dissolved oxygen with a SBE-23Y (Yellow Springs Instrument) in milliliters/liter.

During a cast, sensors are flushed with a SBE-5T pump at approximately 25 ml/s. The system samples and stores all data at 8 Hz (8 samples/ second). Profiling rates should be 20 meters/minute for an average of 24 samples/1 m pressure level. Normally only the downcasts are analyzed (unless a problem is noted). Sensors are factory calibrated annually.

Derived data are calculated using Matlab and/or UNH algorithms developed in accordance with standards prescribed by Fofonoff and Millard, 1983.

For additional information about the SC9801 cruise see the NOAA Coastal Ocean Program Progress Report

Additional data processing notes were provided by the contributor. Note: These notes reflect the CTD processing steps for data collected during the UNH CONVEX progam. However, they are indicative of the processing performed on the data reported here. Parameter names have been changed to agree with GLOBEC requirements.


Acquisition Description

The UNH SeaBird SBE-25 SeaLogger measures:

 

  • Temperature (degrees C) with a SeaBird SBE-3F.
  • Conductivity (Siemens/m) with a SeaBird SBE-4C.
  • Pressure (decibars) with a SBE 29 strain gage sensor.
  • Percent light transmission with a Wet Labs CST-126R transmissometer across a 25 cm distance at the red light wavelength 660 nm. Data are presented as a percentage relative to pure water.
  • Chlorophyll concentration in micrograms/liter with a Wet Labs WETStar Fluorometer model 9607003.
  • PAR (photosynthetically active radiation) with a Biospherical QPS-200PD which observes an upper hemispherical total irradiance in quanta/sq-cm/sec.
  • Dissolved oxygen with a SBE-23Y (Yellow Springs Instrument) in milliliters/liter.

During a cast, sensors are flushed with a SBE-5T pump at approximately 25 ml/s. The system samples and stores all data at 8 Hz (8 samples/ second). Profiling rates should be 20 meters/minute for an average of 24 samples/1 m pressure level. Normally only the downcasts are analyzed (unless a problem is noted). Sensors are factory calibrated annually.


Processing Description

Note: The Brunt-Vaisala Frequency (N-squared) data were reprocessed by Frank Bub with raw data calculated over 1 m intervals, rather than smoothed over 5 m bins. The 5 m bins did not work well with inshore profiles. Negative numbers indicate instability. Use data with caution.

Derived data are calculated using Matlab and/or UNH algorithms developed in accordance with standards prescribed by Fofonoff and Millard, 1983.


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Parameters

ParameterDescriptionUnits
cruiseid cruise identification, i.e. SC9801
siscientific investigator's name
station station number
lat latitude, negative = South decimal degrees
lon longitude, negative = West decimal degrees
time_gmt time, at bottom of cast HHmm, GMT
day_gmt day of month GMT
month_gmtmonth of year GMT
year year GMT
depth_w depth of water meters
nbin number of data cycles per press/bin average
press depth of sample as pressure decibars
temp temperature degrees centigrade
sal salinitiy PSU
sigma_0sigma-theta, potential density kilograms/meter³
depth sample depth decimal meters
potemppotential temperature degrees centigrade
cond conductivity siemens/meter
light_translight transmission, using a transmissometer per cent
fluor fluorescence, chlorophyll conc. micrograms/liter
par_scalar photosynthetically active radiation, scalar (400-700nm) microEinsteins/second/meter²
o2 dissolved oxygen milliliters/liter
bvfq Brunt-Vaisaila Frequency (N-squared) 1/second²
dynh_0 dynamic height, ref. to surface meters
sound_vel


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Instruments

Dataset-specific Instrument Name
CTD Seabird 25
Generic Instrument Name
CTD Sea-Bird 25
Dataset-specific Description
The UNH SeaBird SBE-25 SeaLogger measures - Temperature (degrees C) with a SeaBird SBE-3F. Conductivity (Siemens/m) with a SeaBird SBE-4C. Pressure (decibars) with a SBE 29 strain gage sensor. Percent light transmission with a Wet Labs CST-126R transmissometer across a 25 cm distance at the red light wavelength 660 nm. Data are presented as a percentage relative to pure water. Chlorophyll concentration in micrograms/liter with a Wet Labs WETStar Fluorometer model 9607003. PAR (photosynthetically active radiation) with a Biospherical QPS-200PD which observes an upper hemispherical total irradiance in quanta/sq-cm/sec. Dissolved oxygen with a SBE-23Y (Yellow Springs Instrument) in milliliters/liter.During a cast, sensors are flushed with a SBE-5T pump at approximately 25 ml/s. The system samples and stores all data at 8 Hz (8 samples/ second). Profiling rates should be 20 meters/minute for an average of 24 samples/1 m pressure level. Normally only the downcasts are analyzed (unless a problem is noted). Sensors are factory calibrated annually.
Generic Instrument Description
The Sea-Bird SBE 25 SEALOGGER CTD is battery powered and is typically used to record data in memory, eliminating the need for a large vessel, electrical sea cable, and on-board computer. All SBE 25s can also operate in real-time, transmitting data via an opto-isolated RS-232 serial port. Temperature and conductivity are measured by the SBE 3F Temperature sensor and SBE 4 Conductivity sensor (same as those used on the premium SBE 9plus CTD). The SBE 25 also includes the SBE 5P (plastic) or 5T (titanium) Submersible Pump and TC Duct. The pump-controlled, TC-ducted flow configuration significantly reduces salinity spiking caused by ship heave, and in calm waters allows slower descent rates for improved resolution of water column features. Pressure is measured by the modular SBE 29 Temperature Compensated Strain-Gauge Pressure sensor (available in eight depth ranges to suit the operating depth requirement). The SBE 25's modular design makes it easy to configure in the field for a wide range of auxiliary sensors, including optional dissolved oxygen (SBE 43), pH (SBE 18 or SBE 27), fluorescence, transmissivity, PAR, and optical backscatter sensors. More information from Sea-Bird Electronics: http:www.seabird.com.


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Deployments

SC9801

Website
Platform
R/V Susan and Caitlyn
Report
Start Date
1998-02-21
End Date
1998-02-22
Description
Sampling at two stations in Wilkinson Basin. At each station, a CTD cast and two bongo tows were taken. The bongo net rigging and deployment were comparable to that of the U.S. GLOBEC Broadscale Surveys (with one 150 µm and one 333 µm mesh net) and the sample preservation and curation were done identically. Process cruise.

Acquisition Description
The UNH SeaBird SBE-25 SeaLogger measures: Temperature (degrees C) with a SeaBird SBE-3F. Conductivity (Siemens/m) with a SeaBird SBE-4C. Pressure (decibars) with a SBE 29 strain gage sensor. Percent light transmission with a Wet Labs CST-126R transmissometer across a 25 cm distance at the red light wavelength 660 nm. Data are presented as a percentage relative to pure water. Chlorophyll concentration in micrograms/liter with a Wet Labs WETStar Fluorometer model 9607003. PAR (photosynthetically active radiation) with a Biospherical QPS-200PD which observes an upper hemispherical total irradiance in quanta/sq-cm/sec. Dissolved oxygen with a SBE-23Y (Yellow Springs Instrument) in milliliters/liter. During a cast, sensors are flushed with a SBE-5T pump at approximately 25 ml/s. The system samples and stores all data at 8 Hz (8 samples/ second). Profiling rates should be 20 meters/minute for an average of 24 samples/1 m pressure level. Normally only the downcasts are analyzed (unless a problem is noted). Sensors are factory calibrated annually.

Processing Description
Note: The Brunt-Vaisala Frequency (N-squared) data were reprocessed by Frank Bub with raw data calculated over 1 m intervals, rather than smoothed over 5 m bins. The 5 m bins did not work well with inshore profiles. Negative numbers indicate instability. Use data with caution. Derived data are calculated using Matlab and/or UNH algorithms developed in accordance with standards prescribed by Fofonoff and Millard, 1983.

SC9802

Website
Platform
R/V Susan and Caitlyn
Start Date
1998-04-26
End Date
1998-04-27
Description
process

Acquisition Description
The UNH SeaBird SBE-25 SeaLogger measures: Temperature (degrees C) with a SeaBird SBE-3F. Conductivity (Siemens/m) with a SeaBird SBE-4C. Pressure (decibars) with a SBE 29 strain gage sensor. Percent light transmission with a Wet Labs CST-126R transmissometer across a 25 cm distance at the red light wavelength 660 nm. Data are presented as a percentage relative to pure water. Chlorophyll concentration in micrograms/liter with a Wet Labs WETStar Fluorometer model 9607003. PAR (photosynthetically active radiation) with a Biospherical QPS-200PD which observes an upper hemispherical total irradiance in quanta/sq-cm/sec. Dissolved oxygen with a SBE-23Y (Yellow Springs Instrument) in milliliters/liter. During a cast, sensors are flushed with a SBE-5T pump at approximately 25 ml/s. The system samples and stores all data at 8 Hz (8 samples/ second). Profiling rates should be 20 meters/minute for an average of 24 samples/1 m pressure level. Normally only the downcasts are analyzed (unless a problem is noted). Sensors are factory calibrated annually.

Processing Description
Note: The Brunt-Vaisala Frequency (N-squared) data were reprocessed by Frank Bub with raw data calculated over 1 m intervals, rather than smoothed over 5 m bins. The 5 m bins did not work well with inshore profiles. Negative numbers indicate instability. Use data with caution. Derived data are calculated using Matlab and/or UNH algorithms developed in accordance with standards prescribed by Fofonoff and Millard, 1983.

SC9803

Website
Platform
R/V Susan and Caitlyn
Start Date
1998-06-02
End Date
1998-06-03
Description
process

Acquisition Description
The UNH SeaBird SBE-25 SeaLogger measures: Temperature (degrees C) with a SeaBird SBE-3F. Conductivity (Siemens/m) with a SeaBird SBE-4C. Pressure (decibars) with a SBE 29 strain gage sensor. Percent light transmission with a Wet Labs CST-126R transmissometer across a 25 cm distance at the red light wavelength 660 nm. Data are presented as a percentage relative to pure water. Chlorophyll concentration in micrograms/liter with a Wet Labs WETStar Fluorometer model 9607003. PAR (photosynthetically active radiation) with a Biospherical QPS-200PD which observes an upper hemispherical total irradiance in quanta/sq-cm/sec. Dissolved oxygen with a SBE-23Y (Yellow Springs Instrument) in milliliters/liter. During a cast, sensors are flushed with a SBE-5T pump at approximately 25 ml/s. The system samples and stores all data at 8 Hz (8 samples/ second). Profiling rates should be 20 meters/minute for an average of 24 samples/1 m pressure level. Normally only the downcasts are analyzed (unless a problem is noted). Sensors are factory calibrated annually.

Processing Description
Note: The Brunt-Vaisala Frequency (N-squared) data were reprocessed by Frank Bub with raw data calculated over 1 m intervals, rather than smoothed over 5 m bins. The 5 m bins did not work well with inshore profiles. Negative numbers indicate instability. Use data with caution. Derived data are calculated using Matlab and/or UNH algorithms developed in accordance with standards prescribed by Fofonoff and Millard, 1983.


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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 Science Foundation (NSF)
National Oceanic and Atmospheric Administration (NOAA)

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