[G03-4] Mass transport and redistrubution

[G03-4-02] Glacier melting and GIA in Alaska estimated from joint GPS, ICESat and GRACE measurements

^○Shuanggen Jin, Tengyu Zhang (Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China)

The Alaskan Mountain glacier is one of the largest glaciers on the Earth excluding the polar ice sheets over Antarctica and Greenland. However, it is difficult to quantify of the glacier melting in Alaska due to the limited and high-cost traditional observations of the glaciers. Although Gravity Recovery and Climate Experiment (GRACE) can estimate the glacier mass change, but with large uncertainty in GIA, while ICESat needs the density of Alaskan glacier volume change. In this paper, GPS, ICESat and GRACE measurements from 2003 to 2009 are for the first time jointly used to estimate average density, GIA and glacier mass loss. An optimal density of glacial volume change with 750 kg/m3 is estimated to fit the measurements. The glacier mass loss is -57.5 6.5Gt by converting the volumetric change from ICESat. Furthermore, the GIA is also estimated after correcting the ice mass loss signal in GPS and GRACE measurements.