57A130
Presentation of a new OSISAF medium-resolution sea-ice drift product and comparison to other products
Gorm Dybkjær, Rasmus Tonboe
Corresponding author: Gorm Dybkjær – gd@dmi.dk
Two new sea-ice drift products will soon be implemented in the Ocean and Sea Ice Satellite Application Facility (OSISAF) production chain. Here, the medium-resolution product is presented, validated and compared with other ice-drift products. The ice displacement fields are determined from a maximum cross-correlation procedure on swath data from the AVHRR instrument on board the Metop satellite. The final product is 20 km in resolution, covering the Arctic region on a daily basis in areas with transparent atmosphere. The product is validated against buoy data and the results show practically no bias in ice drift and standard deviation of errors of the two directional components of 1.35 km and 1.36 km for the IR-product and 1.48 km and 1.39 km for the VIS-product. A rough comparison to major operational sea-ice drift datasets and some non-operational datasets show that this new OSISAF product performs best with respect to standard deviation of errors. The product is specifically aimed at assimilation in numerical sea-ice models and for validation schemes as both the seasonal and the day-to-day variations in coverage of ice-drift vectors are a function of cloud cover.
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