Satellite Altimetry and GrAcE Gravimetry for Studies of Annual Water Storage Variations in Bangladesh
Satellite Altimetry and GrAcE Gravimetry for Studies of Annual Water Storage Variations in Bangladesh
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卫星测高和 GracE 重力测量用于研究孟加拉国年度水储存变化
DOI：
10.3319/tao.2008.19.1-2.47(sa
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发表时间：
2008
影响因子：
0.8
通讯作者：
M. Butts
中科院分区：
文献类型：
--
作者：
O. Andersen;P. Berry;J. Freeman;F. LeMoine;S. Lutsckhe;F. Jakobsen;M. Butts
比较了四种不同数据来源对孟加拉国区域年蓄水量变化的观测结果。来自卫星高度计和河流测量仪的数据估计了孟加拉国主要河流地表水储量的变化。GRACE卫星测量综合质量变化，从而测量陆地土壤水分变化，这也可以通过水文模型(GLDAS)进行估计。通过这些类型的观测，可以得出孟加拉国整个区域的综合蓄水量。对于所有数据类型，年度信号是根据2003年和2004年期间的共同数据集估计的。所有四个不同的数据都表明，孟加拉国的储水量在很大程度上是由一个年度信号主导的，其峰值出现在9月初。河流水位的年变化比GRACE观测和GLDAS模型输出的陆地土壤水分观测提前了大约两周。
Four different data sources have been compared with respect to observations of the annual water storage variations in the region of Bangladesh. Data from satellite altimeters and river gauges estimates the variation in surface water storage in the major rivers of Bangladesh. The GRACE satellites measure the integrated mass change and hence the terrestrial soil moisture variations, which can also be estimated by a hydrological model (GLDAS). These types of observations enable the derivation of the integrated water storage in the entire region of Bangladesh. For all data types, the annual signal has been estimated from a common dataset spanning the period 2003 and 2004. All four different data observe that water storage in Bangladesh is largely dominated by an annual signal with a phase peaking in early September. The annual variations in river level peaks roughly two weeks earlier than terrestrial soil moisture observations by GRACE observations and GLDAS model output.