Error Analysis of Real-Time Remotely Sensed Microwave Sea-Ice Motions in the Western Arctic Ocean
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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An algorithm used to composite SSMI 85.5 GHz imagery and derive sea ice motion was adapted for operational testing at Fleet Numerical Meteorology and Oceanography Command FNMOC. A feature tracking technique was applied to a 6-month period, with data provided by FNMOC and the Naval Research Laboratory NRL. Ice motions are detectable using the SSMI motion algorithm, and fields of SSMI motion vectors are qualitatively consistent with coincident fields of in situ buoy motion vectors. Accuracy of the SSMI motion vectors relative to buoy motion vectors increase significantly with buoy speed. No correlation between SSMI and buoy motion vectors is observed for speeds below 3 cms and correlation increases significantly above 5 cms. The results are very sensitive to compositing techniques used to combine SSMI passes into a single sea ice representation. FNMOC data was composited using a drop-in-the-bucket technique while NRL data was composited by a bilinear interpolation technique. Significantly poorer results were found with ENMOC composited data.
- Physical and Dynamic Oceanography
- Snow, Ice and Permafrost
- Miscellaneous Detection and Detectors