INVESTIGATION ON MASS CHANGE OF ICE SHEET INANTARCTIC FROM GRACE TIME-VARIABLE GRAVITY DATA
Li Junhai 1,2) ; Liu Huanling 1,2) ; Wen Hanjiang 1) ; Zhu Guangbin 3) ; and Fang Aiping 1)
1)Chinese Academy of Surveying and Mapping, Beijing 1008302)School of Mapping and Geographic Science, Liaoning Technical University，Fuxin 1230003)School of Geodesy and Geomatics, Wuhan University, Wuhan 430079
Abstract：The rates of Antarctic ice mass change have been estimated by use of the gravity solutions from GRACE level2 RL04 for the period of January 2003 to August 2008 released by UTCSR. Because C0 of GRACE is not accurate enough, C20 from Satellite Laser Ranging (SLR) is adopted instead. The decorrelation filter technique is used for the stripe shape signal presenting in the longitude direction. Antarctic ice mass change rates are investigated again when the gravity in some one month has been chosen to get rid of, and the results are that the rates of Antarctic ice mass do not change a lot in the same area. Gravity model, filtering technique and ICE5G postglacial rebound model are combined to observe the ice loss in the west Amundsen Sea Embayment and the northern Antarctic Peninsula, the rates are -5.28±0.95 cm/a and -1.82±0.77cm/a respectively. Whereas ice mass rates in Southern Ronne Ice Shelf and Enderby land in east Antarctic are positive, and the rates are 1.42±0.69 cm/a and 1.43±0.72 cm/a respectively. Compared with the existing research results, the mass in the west Amundsen Sea Embayment is melting fast, whereas the mass rates in Southern Ronne Ice Shelf and Enderby land in east Antarctic change a little.
Li Junhai,Liu Huanling,Wen Hanjiang et al. INVESTIGATION ON MASS CHANGE OF ICE SHEET INANTARCTIC FROM GRACE TIME-VARIABLE GRAVITY DATA[J]. jgg, 2011, 31(3): 42-46.
