研究目的
To evaluate the precision and bias of ICESat and Envisat altimetry data in the Amundsen Sea Embayment (ASE) in West Antarctica and the Lambert-Amery System (LAS) in East Antarctica during the contemporary period from 2003 to 2008.
研究成果
ICESat has a better precision than Envisat in both study areas. The precision of both satellites varies as a function of surface slope in the two regions, from 6.6 to 16.6 cm for ICESat data and from 0.11 to 0.35 m for Envisat data. The bias of ICESat and Envisat shows a 0.55 and 0.45 m difference in the ASE and LAS, respectively, which can be explained by the radar penetration.
研究不足
The precision of the satellites varies with the surface slope and ice velocity, indicating that the regions with gentle slopes and low velocity obtained a better precision of altimetry data. The Envisat measurements are somewhat lower than those of ICESat, which can be explained by the radar penetration.
1：Experimental Design and Method Selection:
The crossover method was used to obtain the elevation differences between ICESat tracks, Envisat tracks, and between ICESat and Envisat tracks. The standard deviations were computed from the raw data in a grid cell for both ICESat and Envisat.
2：Sample Selection and Data Sources:
ICESat GLA12 dataset (R634) of Antarctic and Greenland ice sheet altimetry data and Envisat Radar Altimeter System (RA-2) data were used.
3：List of Experimental Equipment and Materials:
ICESat/GLAS product and Envisat RA-2 data.
4：Experimental Procedures and Operational Workflow:
Data preprocessing involved selecting points that met geophysical requirements, applying saturation correction, and projecting data from the TOPEX ellipsoid to the WGS84 ellipsoid.
5：Data Analysis Methods:
The standard deviation of the crossover residual at the time-coincident crossover points in the grid was calculated as the precision of each satellite.
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