ron kwok jet propulsion laboratory california institute of technology critically needed: continued...
Post on 21-Dec-2015
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Ron Kwok Jet Propulsion Laboratory
California Institute of Technology
Critically Needed:Continued 3-day RADARSAT
coverage of the Western Arctic Ocean during IPY
204/18/23 RK
3-day RADARSAT mapping of Arctic Ocean
• RADARSAT has been providing 3-day mapping of the Arctic Ocean for derivation of small-scale ice kinematics since Nov 1996
• These observations:• Provide unprecedented spatial sampling of Arctic sea ice drift and
deformation • Support IPY field programs• Are crucial for process studies, model validation, model development,
and climate analysis• Together with Envisat, provide basin scale coverage of the Arctic Ocean
• These routine 3-day observations (through the Alaska Satellite Facility) will not be available to the science community after March 2008 (end of CSA/NASA MOU)
• These observations are critical for supporting IPY science and operations in 2008 and 2009
• The gap in IPY coverage may be to big to be filled by other SARs at this time
Arctic Ocean Coverage24-day RADARSAT orbit cycle
•RADARSAT ScanSAR wide B (460 km swath)•3-day repeat coverage within ASF reception mask•6-day repeat coverage within Tromso reception mask•Acquistion since Nov 96•Gap in Data set: Antarctic Mapping Campaign: Aug-Oct,97•~650 mins of SAR data/cycle
•More than 500 images
3-day coverage
404/18/23 RK
Mapping of time-varying deformation in the ice cover
101 km 103 km
Initial Grid resolution: 10 by 10 kmInitial Grid resolution: 10 by 10 km
Drift tracks ~10 km separation (initially) sampled 1-3 days for two-thirds of the Arctic Oceanfor an entire winter
RADARSAT Geophysical Processor System (RGPS)
102 km