========================= Originally posted 2010-8-27 ========================== North Pole Environmental Observatory SCICEX 1993 Expendable Current Profiles NSF Grants ARC-0909408 Sensitivity of Arctic Ocean Change to Background Mixing and ARC-0856330 OPP-9910305, OPP-0352754 North Pole Environmental Observatory and OCE-9313709 SCICEX Oceanography Dropped at SCICEX 1993 Surface Station 2 XCP Drop 1 1993-08-27/1002 UTC 87deg 35.1min North 142deg 39.2min West Dropped at SCICEX 1993 Surface Station 3 XCP Drop 3 1993-08-28/0855 UTC 83deg 21.9min North 160deg 20.2min West Dropped at SCICEX 1993 Surface Station 4 XCP Drop 4 1993-08-30/1410 UTC 86deg 09.5min North 168deg 02.1min East XCP Drop 5 1993-08-30/1410 UTC 86deg 09.5min North 168deg 02.1min East Dropped at SCICEX 1993 Surface Station 5 XCP Drop 6 1993-08-31/0959 UTC 87deg 15.9min North 119deg 51.9min East XCP Drop 7 1993-08-31/0959 UTC 87deg 15.9min North 119deg 51.9min East Dropped at SCICEX 1993 Surface Station 6 XCP Drop 8 1993-09-01/0354 UTC 84deg 42.3min North 140deg 36.8min East XCP Drop 9 1993-09-01/0354 UTC 84deg 42.3min North 140deg 36.8min East Dropped at SCICEX 1993 Surface Station 7 XCP Drop 10 1993-09-01/1423 UTC 84deg 22.8min North 148deg 02.5min East XCP Drop 11 1993-09-01/1423 UTC 84deg 22.8min North 148deg 02.5min East Dropped at SCICEX 1993 Surface Station 8 XCP Drop 12 1993-09-02/0523 UTC 83deg 03.1min North 164deg 34.2min East XCP Drop 13 1993-09-02/0523 UTC 83deg 03.1min North 164deg 34.2min East Dropped at SCICEX 1993 Surface Station 9 XCP Drop 14 1993-09-03/0208 UTC 80deg 00.3min North 179deg 56.6min East XCP Drop 15 1993-09-03/0208 UTC 80deg 00.3min North 179deg 56.6min East Dropped at SCICEX 1993 Surface Station 10 XCP Drop 16 1993-09-03/1752 UTC 78deg 30.3min North 171deg 52.9min West Dropped at SCICEX 1993 Surface Station 11 XCP Drop 17 1993-09-04/0503 UTC 77deg 23.1min North 166deg 22.4min West XCP Drop 18 1993-09-04/0503 UTC 77deg 23.1min North 166deg 22.4min West Dropped at SCICEX 1993 Surface Station 12 XCP Drop 19 1993-09-04/2100 UTC 75deg 06.2min North 159deg 13.1min West XCP Drop 20 1993-09-04/2100 UTC 75deg 06.2min North 159deg 13.1min West Dropped at SCICEX 1993 Surface Station 13 XCP Drop 21 1993-09-06/0146 UTC 73deg 59.5min North 142deg 09.3min West Dropped at SCICEX 1993 Surface Station 14 XCP Drop 22 1993-09-07/1103 UTC 79deg 50.9min North 141deg 49.9min West XCP Drop 23 1993-09-07/1103 UTC 79deg 50.9min North 141deg 49.9min West Dropped at SCICEX 1993 Surface Station 15 XCP Drop 24 1993-09-08/0920 UTC 83deg 50.9min North 134deg 19.7min West XCP Drop 25 1993-09-08/0920 UTC 83deg 50.9min North 134deg 19.7min West XCP Drop 26 1993-09-08/0920 UTC 83deg 50.9min North 134deg 19.7min West Dropped at SCICEX 1993 Surface Station 17 XCP Drop 28 1993-09-09/1149 UTC 87deg 28.2min North 096deg 34.5min West XCP Drop 29 1993-09-09/1149 UTC 87deg 28.2min North 096deg 34.5min West Dropped at SCICEX 1993 Surface Station 18 XCP Drop 30 1993-09-09/2039 UTC 87deg 58.2min North 067deg 36.8min West These measurements were made with a Sippican Expendable Current Profiler at a surface oceanographic station from USS Pargo during the SCICEX 1993 science cruise ( http://www.ldeo.columbia.edu/res/pi/SCICEX/ ). A brief description of XCPs may be found at http://www.sippican.com/contentmgr/showdetails.php/id/312 . XCP Drops 2, 27, and 31 failed to record. CTD profiles recorded during the same stations and are archived along with the XCP data here in case finding data of this age proves difficult. These are a source of buoyancy data for further XCP analysis. The XCP measures velocity by sensing the voltage generated by the movement of conductive seawater through the earth's magnetic field. The voltage difference is measured between two electrodes on the surface of the XCP, which rotates about once every meter of fall. We use a MATLAB program written by John Dunlap of the UW Applied Physics Lab to process the raw data. This program is available at http://ohm.apl.washington.edu/~dunlap/xcpdsp/ In processing, the components of a harmonic fit to the oscillating potential that are in phase and in quadrature with the oscillating output of a flux gate compass are taken as the magnetic north and magnetic east components of velocity. In order to maximize the potential vertical resolution of the resulting profiles, we chose to do the fits over 2-m, half overlapping "chunks". This gives a vertical wavenumber cutoff of 0.5 cycle m-1 that for the Arctic data is well into the noise floor of the instrument. Users may then filter these basic data in ways appropriate to their applications. Further analysis using these data may be viewed at (http://psc.apl.washington.edu/northpole/Mixing.html). For further information, please contact Dr. James Morison morison@apl.washington.edu (206) 543-1394 Roger Andersen roger@apl.washington.edu (206) 543-1258 at Polar Science Center, Applied Physics Lab, University of Washington 1013 NE 40th, Seattle, WA 98105-6698 USA FAX (206) 616-3142