| Contributors | Affiliation | Role |
|---|---|---|
| Hebert, Dave | University of Rhode Island (URI-GSO) | Principal Investigator |
| Groman, Robert C. | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
Ship: R/V Seward Johnson
Cruises/Dates: SJ9506/April 26 - May 2, 1995
SJ9508/June 6 - 16, 1995
Instruments: RDI, broadband 150 and 600 kHz ADCP units
RDI, narrowband 150 kHz ADCP unit
obs. modes: on-station and along track
See file comments for specifics on instruments used, observational modes
and data averaging intervals.
Prepared by: Russ Burgett, URI Contributor: Dave Hebert Graduate School of Oceanography Univ. of Rhode Island Narragansett, RI 02882-1197 voice: 401 874 6610 fax: 401 874 6728 email: hebert@gso.uri.edu Updated: August 27, 2004; gfh
SJ9508 NB 150 kHz ADCP 5 minute average
| File |
|---|
allADCP.csv (Comma Separated Values (.csv), 107.11 MB) MD5:a2e1d405a9c4ee8550ef7c202d2628c7 Primary data file for dataset ID 2412 |
| Parameter | Description | Units |
| cruiseid | cruise/file identification | |
| year | year | |
| yrday_gmt | year day and decimal time, Jan 1 is year day 0 | GMT |
| lat | latitude, negative = South | degrees |
| lon | longitude, negative = West | degrees |
| press | depth of observation, reported as pressure | decibars |
| u | east component of currents, east = positive | centimeters/second |
| v | north component of current, north = positive | centimeters/second |
| beam | unknown | |
| frequency | ||
| site | ||
| bin |
| Dataset-specific Instrument Name | Acoustic Doppler Current Profiler |
| Generic Instrument Name | Acoustic Doppler Current Profiler |
| Dataset-specific Description | Acoustic Doppler Current Profiler, encompasses an array of band widths and frequencies.
RDI, broadband 150 and 600 kHz ADCP units.RDI, narrowband 150 kHz ADCP unit. |
| Generic Instrument Description | The ADCP measures water currents with sound, using a principle of sound waves called the Doppler effect. A sound wave has a higher frequency, or pitch, when it moves to you than when it moves away. You hear the Doppler effect in action when a car speeds past with a characteristic building of sound that fades when the car passes. The ADCP works by transmitting "pings" of sound at a constant frequency into the water. (The pings are so highly pitched that humans and even dolphins can't hear them.) As the sound waves travel, they ricochet off particles suspended in the moving water, and reflect back to the instrument. Due to the Doppler effect, sound waves bounced back from a particle moving away from the profiler have a slightly lowered frequency when they return. Particles moving toward the instrument send back higher frequency waves. The difference in frequency between the waves the profiler sends out and the waves it receives is called the Doppler shift. The instrument uses this shift to calculate how fast the particle and the water around it are moving. Sound waves that hit particles far from the profiler take longer to come back than waves that strike close by. By measuring the time it takes for the waves to bounce back and the Doppler shift, the profiler can measure current speed at many different depths with each series of pings. (More from WHOI instruments listing). |
| Website | |
| Platform | R/V Seward Johnson |
| Report | |
| Start Date | 1995-04-25 |
| End Date | 1995-05-03 |
| Description | this was a process cruise. Process turbulence. Methods & Sampling SJ9506 BB 600 kHz ADCP 5 minute average |
| Website | |
| Platform | R/V Seward Johnson |
| Start Date | 1995-06-06 |
| End Date | 1995-06-16 |
| Description | This was a process type cruise. Process turbulence.
Note: Twenty one navigation records in the evenlog were corrected on February 3, 2011 to fix errors in the latitude, from 41 to 40, for the inclusive dates of 6/11/1995: 0218 - 1536 (GMT). [MDA and RCG] Methods & Sampling SJ9508 NB 150 kHz ADCP 5 minute average |
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).
| Funding Source | Award |
|---|---|
| National Science Foundation (NSF) | |
| National Oceanic and Atmospheric Administration (NOAA) |
