HR: 0800h
AN: U21C-0622    [Abstracts]
TI: Laurentia Glacial Isostatic Adjustment Observed From GRACE and Satellite Altimetry
AU: * Lee, H
EM: lee.2444@osu.edu
AF: School of Earth Sciences, The Ohio State University, Columbus, OH 43210, United States
AU: Shum, C
EM: ckshum@osu.edu
AF: School of Earth Sciences, The Ohio State University, Columbus, OH 43210, United States
AU: Kuo, C
EM: kuo70@mail.ncku.edu.tw
AF: Department of Geomatics, National Cheng Kung University, Tainan, 701, Taiwan
AU: Schmidt, M
EM: schmidt@dgfi.badw.de
AF: Deutsches Geodätisches Forschungsinstitut, Alfons-Goppel-Strasse 11, Munich, 80539, Germany
AU: Wu, P
AF: Department of Geology and Geophysics, University of Calgary, Calgary, AB T2N 1N4, Canada
AU: Braun, A
EM: braun@ucalgary.ca
AF: Deparment of Geomatics Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
AU: van der Wal, W
EM: wvander@ucalgary.ca
AF: Deparment of Geomatics Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
AU: Wang, H
EM: whs@asch.whigg.ac.cn
AF: Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, 430077, China
AB: The use of satellite radar altimetry to detect solid Earth deformation signals such as the Glacial Isostatic Adjustment (GIA) has been demonstrated by Lee et al. (2007) observing the Laurentia GIA signals using TOPEX (1992–2002) over the Hudson Bay land region. GRACE gravimetry, despite of its short data record (2002–present), confirmed the presence of two Pleistocene ice domes near the east and west of Hudson Bay manifested in the incomplete GIA in Laurentia (Tamisiea et al., 2007). In this study, we densify land uplift measurements over the Hudson Bay land region by developing 10-Hz stackfile from TOPEX (1992-2002), and by combining altimetry measurements and long-term water level records (Kuo et al., 2007) for data over small lakes. Here we use GRACE observations of Hudson Bay land region uplift, including the use of spherical harmonic and regional solutions (spherical wavelet solutions directly using L1B KBR data), radial GIA models (ICE4G, ICE5G, BIFROST), and 3-D laterally heterogeneous GIA model (RF3S20), and satellite altimetry observed deformation rates, to study potential constraints on the Pleistocene GIA process over Laurentia, including ice modeling and Earth rheology.
DE: 1211 Non-tectonic deformation
DE: 1217 Time variable gravity (7223, 7230)
SC: Union [U]
MN: 2007 Fall Meeting