Estimating Large-Scale Precipitation Minus Evapotranspiration from GRACE Satellite Gravity Measurements
Estimating Large-Scale Precipitation Minus Evapotranspiration from GRACE Satellite Gravity Measurements
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DOI：
10.1175/jhm478.1
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发表时间：
2006-04
影响因子：
3.8
通讯作者：
S. Swenson;J. Wahr
中科院分区：
文献类型：
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作者：
S. Swenson;J. Wahr
摘要目前，对地球大规模水和能源收支的关键组成部分的观测很少，甚至不存在。一个关键的组成部分，降水减去蒸散量（P-ET），由于缺乏对ET的观测，在很大程度上仍然无法测量。降水量减去蒸散量描述了大气和地表之间的水通量，因此提供了关于大气与地表相互作用的重要信息。在本文中，来自重力恢复和气候实验（GRACE）项目的卫星重力数据的大陆水存储的大规模变化与河流流量数据相结合，以获得区域平均P − ET的估计。在构建了一个描述大规模陆地水平衡的方程，反映了GRACE水储量估计的时间采样，GRACE推导的P − ET估计值与从再分析数据集[NCEP/能源部（DO...
Abstract Currently, observations of key components of the earth's large-scale water and energy budgets are sparse or even nonexistent. One key component, precipitation minus evapotranspiration (P − ET), remains largely unmeasured due to the absence of observations of ET. Precipitation minus evapotranspiration describes the flux of water between the atmosphere and the earth's surface, and therefore provides important information regarding the interaction of the atmosphere with the land surface. In this paper, large-scale changes in continental water storage derived from satellite gravity data from the Gravity Recovery and Climate Experiment (GRACE) project are combined with river discharge data to obtain estimates of areally averaged P − ET. After constructing an equation describing the large-scale terrestrial water balance reflecting the temporal sampling of GRACE water storage estimates, GRACE-derived P − ET estimates are compared to those obtained from a reanalysis dataset [NCEP/Department of Energy (DO...