Correcting the Ice Draft Data from the SCICEX '98 Cruise
Abstract
A solution is presented for correcting the ice draft data collected by the Digital Ice Profiling System (DIPS) from the first half of the SCICEX '98 cruise. The ice draft measurements are intrinsically related to the depth of the submarine and were corrupted by faulty measurements of depth. The ship's digital depth detector measured the gross movements of the submarine, but was unresponsive to small changes in depth associated with the natural porpoising of the boat. This porpoising, which is a periodic vertical movement of the submarine of several feet, was transferred to the ice draft data. An independent sensor package, the Icecat2, collected pressure data, which were converted to depth. The DIPS and Icecat2 systems had different clocks. To align them the depth signatures from each system were compared during large, rapid descents of the submarine. A time-dependent time offset between the two clocks was computed. By removing the DIPS depths from the ice draft measurements and replacing them with the depths measured by the Icecat2 system, the ice draft data were corrected.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2002
- Accession Number
- ADA403470
Entities
People
- D. Rothrock
- G. Maykut
- M. Wensnahan
- S.M. Dickinson
Organizations
- University of Washington