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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