A comparison of terrestrial water storage variations from GRACE with in situ measurements from Illinois
A comparison of terrestrial water storage variations from GRACE with in situ measurements from Illinois
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DOI：
10.1029/2006gl026962
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发表时间：
2006-08
影响因子：
5.2
通讯作者：
S. Swenson;P. Yeh;J. Wahr;J. Famiglietti
中科院分区：
文献类型：
--
作者：
S. Swenson;P. Yeh;J. Wahr;J. Famiglietti
这项研究提出了第一个直接比较陆地水储存估计重力恢复和气候实验（GRACE）卫星使命在现场水文观测。每月异常的总水存储来自GRACE重力场相结合的土壤水分和地下水的测量，从一个网络的观测站点在伊利诺伊州进行了比较。这种比较是通过使用最近开发的滤波技术，旨在选择性地删除相关的GRACE光谱系数中的错误。该滤波器的应用显着提高了GRACE水存储估计的空间分辨率，并产生了一个时间序列，同意相当不错（RMS差= 20.3毫米），在现场测量平均超过280，000平方公里的面积。
This study presents the first direct comparison of terrestrial water storage estimates from the Gravity Recovery and Climate Experiment (GRACE) satellite mission to in situ hydrological observations. Monthly anomalies of total water storage derived from GRACE gravity fields are compared with combined soil moisture and groundwater measurements from a network of observing sites in Illinois. This comparison is achieved through the use of a recently developed filtering technique designed to selectively remove correlated errors in the GRACE spectral coefficients. Application of this filter significantly improves the spatial resolution of the GRACE water storage estimates, and produces a time series which agrees quite well (RMS difference = 20.3 mm) with the in situ measurements averaged over an area of ∼280,000 km2.