<div><p>The ADCP pinged at as high a rate as possible with the power available in the ADCP with auxiliary battery pack - 900 pings at 4-second intervals so that the expected uncertainty in the velocity measurement was less that 0.5 cm/sec. The 1-hour (or sometimes 0.5 hour) averaged horizontal velocities were measured in 1-m vertical bins from about 8-m depth to about 10 m above bottom. The loss at the top was due to blanking to remove transducer ringing, and the loss at the bottom was due to sidelobe reflection from the direct downward path to the bottom. The amplitude of the backscattered signal was also recorded in the 1-meter bins and used to monitor the time and depth changes in backscattered signal (related to biological scatterers in the water column). The ADCP also "saw" the instrumentation along the mooring line as side-lobe reflection contamination of the records. This was not apparent in short records (1 week), but becomes obvious with 6-month long record averages. The amplitude of the backscattered signal has an increased level and the Doppler velocities decreased at the depths of the sensors. The decreased velocity estimate is because the signal reflected from the stationary sensors has zero Doppler shift and biases the velocity estimate toward zero. (December 2005 WHOI-2005-11; " <a href="http://globec.whoi.edu/globec-dir/data_doc/WHOI-2005-11.pdf" target="blank"><em>U.S. GLOBEC Georges Bank Long-Term Moored Program: Part 1 - Mooring Configuration</em></a>" by J.D. Irish, S. Kerry, P. Fucile, R.C. Beardsley, J. Lord, and Ken Brink.)</p></div>
Georges Bank Southern Flank ADCP 1998 data
<div><p>"As part of the U.S. GLOBEC Northwest Atlantic/Georges Bank program, moorings were deployed on Georges Bank as part of the broad-scale survey component to help measure the temporal variability of both physical and biological characteristics on the Bank. The array consisted of a primary mooring site on the Southern Flank which was maintained for the full 5-year duration of the field program, plus secondary moorings, with fewer sensors and of shorter duration, in the well-mixed water on the Crest and in the cod/haddock spawning region on the Northeast Peak. Temperature and conductivity (salinity) were measured at 5-m intervals, ADCP velocity profiles were obtained with 1-m vertical resolution, and bio-optical packages (measuring fluorescence, optical transmission and photosynthetically active radiation) were deployed at 10-m and 40-m depths. Bottom pressure was measured at the Southern Flank site. The buoy design, sensors and mooring configuration is presented and discussed below, and the data obtained is presented and discussed in an accompanying report "U.S. GLOBEC Georges Bank Long-Term Moored Program: Data Report." (December 2005 WHOI-2005-11; " <a href="http://globec.whoi.edu/globec-dir/data_doc/WHOI-2005-11.pdf" target="blank"><em>U.S. GLOBEC Georges Bank Long-Term Moored Program: Part 1 - Mooring Configuration</em></a>" by J.D. Irish, S. Kerry, P. Fucile, R.C. Beardsley, J. Lord, and Ken Brink.)</p>
<p>"Long-term moorings were deployed on Georges Bank from the fall of 1994 through the summer of 1999. The Southern Flank site was occupied all years, the Crest just the first and the Northeast Peak the second, fourth and fifth years. Not all depths were occupied by all sensors at all times." (DRAFT REPORT - 27 April 2005, WHOI-2005-XX, "<a href="http://globec.whoi.edu/globec-dir/data_doc/GLOBEC-GB_moorings-2_Apr05_DRAFT.pdf" target="blank"><em>U.S. GLOBEC Georges Bank Long-Term Moored Program: Part 2 - Yearly Data Summary and Report</em></a>" J.D. Irish, R.C. Beardsley, M. Caruso, R. Limeburner, and Ken Brink)</p></div>
SF_adcp_1998
<div><p>Also see <a href="http://globec.whoi.edu/jg/serv/globec/gb/mooring/1999/SF_vel_temp.html0%7Bdir=globec.whoi.edu/jg/dir/globec/gb/mooring/,info=globec.whoi.edu/jg/info/globec/gb/mooring/SF_vel_temp%7D"> Southern flank velocity & temperature movies (1999)</a></p>
<p><img alt="ADCP_SF_1996-1999" src="https://datadocs.bco-dmo.org/static/globec.whoi.edu/images/gb/ADCP_SF_1996-1999_stick.png" style="height:545px; width:624px" /></p></div>
3283
SF_adcp_1998
2010-06-16T16:40:40-04:00
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2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:3283
Georges Bank Southern Flank ADCP data from GB SFlank Mooring SF_buoy_dep5, SF_buoy_dep6, SF_buoy_dep7.1, SF_buoy_dep7.2 in the Georges Bank, Southern Flank from 1997-1999 (GB project)
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Beardsley, R. C., Irish, J., Irish, J. (2009) Georges Bank Southern Flank ADCP data from GB SFlank Mooring SF_buoy_dep5, SF_buoy_dep6, SF_buoy_dep7.1, SF_buoy_dep7.2 in the Georges Bank, Southern Flank from 1997-1999 (GB project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2009-12-10) Version Date 2009-12-10 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/3283 [access date]
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