Experiment name: not available Principal Investigator: not available PI's affiliation: Scottish Mar Bio Assn Mooring Name: not available Mooring position: 57.263 deg N, 10.362 deg W Instrument depth: 458 meters Seafloor depth: 2229 meters Times: starts 12 Apr 1981, ends 15 Oct 1981 Time increment: 30 minutes Instrument type: Aanderaa parameter min mean max sd days speed (cm/sec) 0.00 19.74 66.20 9.79 185.8 dir (deg true) 0.00 164.85 359.03 84.51 185.8 u (cm/sec) -42.67 1.51 42.57 14.65 185.8 v (cm/sec) -60.94 -6.69 41.09 14.96 185.8 temp (deg C) 8.30 9.16 9.71 0.26 185.8 pressure (db) 551.30 572.25 886.80 33.16 185.8 BODC has provided the following cautionary note: The pressure measurements are only suitable for relative depth confirmation and for evaluation of the motion of the mooring system. The pressure record shows that the rig suffered knockdown on occasions throughout the deployment; the most severe displace- ment of this meter was of the order of 300m and occured during 30 to 31 May 81 and on 5 Aug 81. Our comments: There is a 7-hour episode of below threshold speed on 18 Aug 81 that may be due to a failure of the speed sensor. This record was made with an Aanderaa current meter. The nominal speed threshhold of this meter is 1.5 cm/sec, and a common practice is to set below-threshhold speeds either to the threshhold value or to half the threshhold. In this case, however, below-threshhold speeds were set to zero by the originating PI, as were concurrent directions. In processing historical data we normally reset below- threshhold Aanderaa speeds to half the threshhold, but have not done so in this case because the direction information has been lost.
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