HR: 11:35h
AN: C22A-06    [Abstracts]
TI: Sea-ice free-board heights in the Arctic Ocean from ICESAT and airborne laser
AU: Skourup, H
EM: hsk@kms.dk
AF: Geodynamics Dept., Rentemestervej 8, Copenhagen NV, DK2400 Denmark
AU: * Forsberg, R
EM: rf@kms.dk
AF: Geodynamics Dept., Rentemestervej 8, Copenhagen NV, DK2400 Denmark
AU: Hvidegaard, S M
EM: smj@kms.dk
AF: Geodynamics Dept., Rentemestervej 8, Copenhagen NV, DK2400 Denmark
AU: Keller, K
EM: krk@kms.dk
AF: Geodynamics Dept., Rentemestervej 8, Copenhagen NV, DK2400 Denmark
AB: Sea-ice free-board heights, and thus ice thickness, may be readily determined by lowest level-filtering of Icesat or airborne lidar data in combination with a precise geoid model. In the paper we outline sea-ice freeboard height results in the Arctic Ocean from ICESAT, using an updated geoid model from combined ArcGP, GRACE and ICESAT-derived gravity field data. We compare the results to airborne scanning laser data from recent airborne campaigns in the Arctic Ocean north of Greenland, Ellesmere Island and Svalbard. The high-resolution airborne swath laser data, with a resolution of 1 m and a relative vertical accuracy of few cm, provide detailed mapping of ridges and leads, and thus provides an opportunity for understanding ICESAT waveform characteristics for different sea-ice regimes.
DE: 1827 Glaciology (1863)
DE: 1863 Snow and ice (1827)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting