Estimation of global glacier mass changes

这一分项目的主要目标是根据遥感数据得出冰川质量的长期变化。我们将主要利用现有的多时相数字高程模型来获取2000-2013年期间及其中的两个子时段的质量变化。为了验证、校准和不确定度估计，将使用高分辨率立体图像、ICESat激光高度计和现场质量平衡测量。一项重要的任务是改进ICESat数据的现有算法，并获取新的高分辨率数据，以便测试获得质量变化的季节性变化的可能性。为此，P8项目将集中在WatGAP内的两个冰川关键区，即青藏高原的内河盆地和恒河盆地，以及这些地区内较小的集水区。所得到的冰川质量变化将用于从2000年起重新校准全球水文模式Water GAP中的冰川方案HYOGA2，并将支持冰川信号与冰川化地区GRACE信号的其他分量的分离。

The main objective of this subproject is to derive long-term glacier mass changes based on remote sensing data. We will mainly use existing multi-temporal digital elevation models to obtain the mass changes for the ~period 2000 – 2013 and two subperiods therein. For validation, calibration and uncertainty estimation high resolution stereo imagery, ICESat laser altimetry and in-situ mass balance measurements will be used. An important task is to improve existing algorithms for ICESat data and to acquire new high resolution data in order to test the potential for obtaining seasonal variations of mass changes. For this, Project P8 will concentrate on the two glacierised critical regions within WaterGAP, the endorheic basins of the Tibetan Plateau and the Ganges basin along with smaller catchments within these regions. Derived glacier mass changes will be applied to recalibrate HYOGA2, the glacier scheme in the global hydrological model WaterGAP, for the period ~2000 onwards, and will support the separation of the glacier signal from the other components of the GRACE signal over glacierised regions.