HR: 16:30h
AN: C34A-03    [Abstracts]
TI: Sea-ice freeboard heights in the Arctic Ocean from ICESat and airborne lidar - a comparison
AU: * Skourup, H
EM: hsk@dnsc.dk
AF: Danish National Space Center, Juliane Maries Vej 30, Copenhagen Oe, DK2100 Denmark
AU: Forsberg, R
EM: rf@dnsc.dk
AF: Danish National Space Center, Juliane Maries Vej 30, Copenhagen Oe, DK2100 Denmark
AB: Two near-coincident tracks of ICESat/GLAS and airborne scanning airborne lidar data were acquired on May 25, 2004, in the Arctic Ocean north of Greenland, in an area of thick perennial sea-ice with few open leads and numerous large ridges. The airborne lidar data, having a relative accuracy of few cm and 1 m spatial resolution, provide an excellent quantification of the ability of ICESat to detect and model sea-ice features such as leads and ridges, as well as gaining insight into the expected ICESat waveforms over heavily deformed sea-ice. In the paper we outline the underflight experiment and hardware, as well as show examples of the good fit between ICESat and filtered airborne data, matching the ICESat footprint. We also compare the observed ICESat waveforms to the airborne data, as well as quantify the biases induced by "lowest-level" filtering techniques in this particular area. We conclude by showing examples of Arctic Ocean-wide freeboard heights derived from ICESat by an improved "lowest-level" technique, showing good overall correlation to Quikscat multi-year ice distribution and expected seasonal changes.
DE: 0750 Sea ice (4540)
DE: 0754 Leads (4540)
DE: 0758 Remote sensing
SC: Cryosphere [C]
MN: Fall Meeting 2005