Long-term Total Water Storage Change from a SAtellite Water Cycle (SAWC) reconstruction over large south Asian basins
Long-term Total Water Storage Change from a SAtellite Water Cycle (SAWC) reconstruction over large south Asian basins
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DOI：
10.5194/hess-2019-262
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发表时间：
2019-12
期刊：
影响因子：
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通讯作者：
V. Pellet;F. Aires;F. Papa;S. Munier;B. Decharme
中科院分区：
文献类型：
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作者：
V. Pellet;F. Aires;F. Papa;S. Munier;B. Decharme
抽象。陆地总蓄水量变化是全球水循环的重要组成部分，对气候变率、海平面收支和人类生活所需的水资源有着重要影响。它的第一次大规模估计是在2002-2016年期间通过GRACE观测获得的，随后自2018年以来，GRACE-FO使命启动。在本文中，使用基于水团守恒规则的方法，我们建议合并基于卫星的降水和蒸散观测沿着与原位河流流量测量，以估计TWSC在较长的时间段（通常从1980年至2016年），与气候研究兼容。我们进行了这项任务，在五个主要的亚洲流域，同时大的气候变化和强大的人为水资源的压力，并为长期记录的原位排放测量。我们的SAWC重建在季节和年际变化方面提供了非常一致的TWSC估计，这些独立的信息来源包括（1）TWSC GRACE衍生观测（2002-2015年期间），（2）ISBA-CTRIP模型模拟（1980-2015年）和（3）多卫星淹没范围（1993-2007年）。该分析显示了使用多个卫星数据集沿着原位数据来执行缺失的水成分估计的水文相干重建的优点。它为长期监测TWSC提供了一个新的重要信息来源，并更好地了解它们在全球和陆地水循环中的关键作用。
Abstract. The Total Water Storage Change (TWSC) over land is a major component of the global water cycle, with a large influence on climate variability, sea level budget and water resources availability for human life. Its first estimates at large-scale were made available with GRACE observations for the 2002–2016 period, followed since 2018 by the launch of GRACE-FO mission. In this paper, using an approach based on the water mass conservation rule, we proposed to merge satellite-based observations of precipitation and evapotranspiration along with in situ river discharge measurements to estimate TWSC over longer time periods (typically from 1980 to 2016), compatible with climate studies. We performed this task over five major Asian basins, subject to both large climate variability and strong anthropogenic pressure for water resources, and for which long term record of in situ discharge measurements are available. Our SAtellite Water Cycle (SAWC) reconstruction provides TWSC estimates very coherent in terms of seasonal and interannual variations with independent sources of information such as (1) TWSC GRACE-derived observations (over the 2002–2015 period), (2) ISBA-CTRIP model simulations (1980–2015), and (3) multi-satellite inundation extent (1993–2007). This analysis shows the advantages of the use of multiple satellite-derived data sets along with in situ data to perform hydrologically coherent reconstruction of missing water component estimate. It provides a new critical source of information for long term monitoring of TWSC and to better understand their critical role in the global and terrestrial water cycle.