基于激光测高卫星的东南极表面高变化分析

Elevation Changes of East Antarctic Derived from ICESat Laser Altimetry

摘要:

利用美国国家冰雪数据中心（NSIDC）最新发布的ICESat（云和地面高度卫星） R633版本的GLA12激光测高数据，使用重复轨最小二乘平面拟合的方法，计算得到东南极兰伯特冰川流域（Lambert）2003年~2009年的高程变化率.使用高度计重复观测数据确定表面高变化的时候，要考虑地形坡度的影响.假定在沿ICESat重复轨道小段范围内，可以用平面来拟合坡度和高程变化，并依此来计算高程变化.结果表明，Lambert冰川流域2003年~2009年平均高程变化率为(1±0.5) cm·yr-1.与已有研究成果以及交叉点获取的高程变化比较，提出的重复轨平面拟合方法有效可行.

Abstract:

A least squares plane fitting of repeat tracks method was proposed to estimate the elevation changes of the Lambert Glacier Basin, East Antarctica. Using the latest ICESat (ice, cloud, and land elevation satellite) R633 version GLA12 altimetry products released by the National Snow and Ice Data Center (NSIDC), the elevation changes from 2003 to 2009 were estimated. The terrain slope should be considered when using altimeter repeat observation data determine surface elevation change. We assume that least squares plane fitting along track can separate both the slope of plane and elevation change rate, and consequently the elevation changes can be calculated. The results show that the average elevation rate of lambert glacier basin is (1±0.5) cm·yr-1 from 2003 to 2009, which is consistant with previous research results. The crossover point method was also used to verify the results, which proved that the repeat tracks plane fitting is an effective and feasible method.