The Study Of Detecting Elevation Changes In The Polar Ice Sheet And Inland Glacier Using Satellite Altimetry

Spatial and temporal pattern changes of the polar ice sheet and inland glacier have a major impact on global climate change and human life. Because of the harsh polar ice sheet and inland glacier climate conditions, satellite altimetry technique is one of the effective means monitoring elevation changes in the polar ice sheet and of inland glacier. ICESat and CryoSat-2 data are used to study the polar ice sheet and inland glacier elevation changes, the main research contents include:1. Using the crossover analysis from 2003 to 2009 of ICESat GLA12 data obtains the mean elevation change rate of West Antarctica ice sheet is (1.18±16.42)cm·yr-1. Using repeat-track information and fitting least-squares regression planes to process CryoSat-2 GDR data during 2010.07-2014.04, the mean elevation change rate of West Antarctica ice sheet estimated is (-10.9±42.1)cm·yr-1.2. The ICESat processing result is compared with GRACE results at the position A (249.5°,74.5°) in West Antarctic ice sheet. Using the linear and sine/cosine combination model and ICE5G post-glacial rebound model to correct, the elevation linear rate of change at the position A is -3.66cm·yr-1 from ICESat. It is similar to GRACE result of (-5.28±0.95)cm·yr-1.3. The freeboard change rate which at fight intersection is estimated from 2010-2012 IceBridge data. The result shows that 82% of the freeboard change rate at the crossover is in the -30?30cm·yr-1 range.4. Using linear regression and repeat-tracks based on DEM from ICESat GLA14 data and SRTM digital elevation model, respectively, the elevation changes and trends of glacier area on the partial Tibetan plateau (27°-29°N,85°-90°E) during 2003-2008 are (-0.373±0.180)m·yr-1 and (-0.473±0.680)m·yr-1, It shows that two methods results are similar.