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Ron Kwok

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MEAS-06: Small-Scale Kinematics of Arctic Ocean Sea Ice
RADARSAT-1 has provided over eleven years of near-uninterrupted 3-day snapshots of the Arctic Ocean ice cover. In this project the SAR imagery from RADARSAT-1 is used to track the sea ice on a high-resolution grid to produce a data set of small-scale kinematics and deformation. This data set has contributed significantly to sea ice science in: the development of new approaches for modeling the mechanical behavior of sea ice and the validation of these models; the characterization of the sub-daily ice motion; a description of the seasonal and regional variability of sea ice deformation; the validation of ICESat freeboard algorithms; and, the estimates of sea ice exchange between the Arctic Ocean and the peripheral seas.

MEAS-12: Small-Scale Kinematics of Arctic Ocean Sea Ice and South Ocean Sea Ice
Between 2008 and 2012, we have constructed an archive of Envisat SAR imagery of the Arctic and Southern Oceans. In this project, the SAR imagery from Envisat is used to produce a high-resolution data set of small-scale sea ice kinematics and deformation. The motion field is sampled in Eulerian mode.

ICESat: Sea Ice Thickness and Freeboard
ICESat (Ice, Cloud, and land Elevation Satellite) is the benchmark Earth Observing System mission for measuring, among other earth surface parameters, sea ice surface elevation. The 17 ICESat datasets contain nearly month-long observations of sea ice surface elevation and other radar characteristics for fall, winter, and spring periods covering the time period of winter 2003 to the present, both in the Arctic and Antarctic regions.

CryoSat: Sea Ice Thickness
ESA’s Earth Explorer CryoSat-2 mission, launched on 8 April 2010, is dedicated to the monitoring of changes in the sea ice thickness of the polar oceans. Monthly fields of CS-2 sea ice thickness estimates produced at JPL can be found here.

Ice Motion: Passive Microwave Analyses
The Scanning Multichannel Microwave Radiometer (SMMR), Special Sensor Microwave Imager (SSM/I), and Advanced Microwave Scanning Radiometer - EOS (AMSR-E) instruments have all in turn been in earth orbit for a number of decades on a variety of platforms, taking measurements of the brightness temperatures of the Earth's polar regions on a near continuous basis. This long satellite data record has provided the ability to estimate sea ice motion since 1979 to the present. In this project the imagery created from these measurements is used to track sea ice features and produce mean ice motion fields down to a daily time scale.


Mail to: Ronald Kwok