Table of Contents

• Coverage
• Dataset Description
  • Methods & Sampling
  • Data Processing Description
• Data Files
• Parameters
• Instruments
• Deployments
• Project Information
• Program Information
• Funding

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.

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.

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.

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.

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).