HR: 0800h
AN: C11B-0431    [Abstracts]
TI: Determining Deformed Sea Ice Properties Using Multisensor Observations
AU: * Holt, B
EM: Ben.Holt@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Haas, C
EM: chaas@awi.de
AF: University of Alberta, 114 St - 89 Ave, Alberta, T6G 2E3, Canada
AU: Haas, C
EM: chaas@awi.de
AF: Alfred Wegener Institute for Polar and Marine Research, Postfach 12 01 61, Bremerhaven, 27515, Germany
AU: Melling, H
EM: MellingH@pac.dfo-mpo.gc.ca
AF: Institute of Ocean Sciences, 9860 West Saanich Road, Sidney, BC V8L 4B2, Canada
AU: Hendricks, S
EM: stefan.hendricks@awi.de
AF: Alfred Wegener Institute for Polar and Marine Research, Postfach 12 01 61, Bremerhaven, 27515, Germany
AB: Deformed ice (ridges) is a major component of the sea ice volume, yet this property has proven difficult to quantify from satellite sensors in terms of frequency, orientation, extent and height. One problem is detectability, where it is known, for example, that imaging radars with L-band SARs (1.2 GHz) and even lower in frequency may identify ridges and deformed ice more clearly than the more commonly flown C-band SAR (5.6 GHz) sensors. Another problem is that nearly all fine-resolution sensors generally have a coarser resolution than the ridges themselves, also making clear detection difficult. In this study we examine fine resolution L-band SAR imagery from both JERS-1 (18 m) and recently obtained ALOS PALSAR (6-10m resolution) over the Arctic with coincident in situ measurements of ice draft from upward looking sonar placed on moorings (JERS-1) and of thickness from electromagnetic induction sensors flown on a helicopter (ALOS) during the Aplis"07/SEDNA field campaign. Geometrical corrections were applied to the SAR imagery in order to closely align the satellite imagery in space with the in situ measurements. Temporal adjustments related to ice motion were made through feature detection and additional SAR imagery from Radarsat and ERS-2. We will discuss the correlation of radar backscatter with the extent, orientation, and height of ridges and the possibility of quantifying deformed ice properties from satellite SAR imagery.
DE: 0750 Sea ice (4540)
DE: 0758 Remote sensing
SC: Cryosphere [C]
MN: 2007 Fall Meeting