Retrieval of Large-Scale Hydrological Signals in Africa from GRACE Time-Variable Gravity Fields

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• 作者：Jean-Paul Boy (12) jeanpaul.boy@unistra.fr
  Jacques Hinderer (1) jacques.hinderer@unistra.fr
  Caroline de Linage (3) caroline.delinage@uci.edu
• 关键词：Time ; variable gravity – ; global change from geodesy – ; hydrology – ; Africa
• 刊名：Pure and Applied Geophysics
• 出版年：2012
• 出版时间：August 2012
• 年：2012
• 卷：169
• 期：8
• 页码：1373-1390
• 全文大小：2.1 MB
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• 作者单位：1. EOST-IPGS (UMR 7516 CNRS-UdS), 5 rue Rene Descartes, 67084 Strasbourg, France2. Planetary Geodynamics Laboratory, Code 698, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA3. Department of Earth System Science, University of California, Irvine, CA 92697, USA
• ISSN：1420-9136

文摘

Since its launch in April 2002, the Gravity Recovery and Climate Experiment (GRACE) mission is recording the Earth’s time-variable gravity field with temporal and spatial resolutions of typically 7–30 days and a few hundreds of kilometers, allowing the monitoring of continental water storage variations from both continental and river-basin scales. We investigate here large scale hydrological variations in Africa using different GRACE spherical harmonic solutions, using different processing strategies (constrained and unconstrained solutions). We compare our GRACE estimates to different global hydrology models, with different land-surface schemes and also precipitation forcing. We validate GRACE observations through two different techniques: first by studying desert areas, providing an estimate of the precision. Then we compare GRACE recovered mass variations of main lakes to volume changes derived from radar altimetry measurements. We also study the differences between different publicly available precipitation datasets from both space measurements and ground rain gauges, and their impact on soil-moisture estimates.