Acceleration signal in GRACE time-variable gravity in relation to interannual hydrological changes
Acceleration signal in GRACE time-variable gravity in relation to interannual hydrological changes
复制标题
DOI：
10.1111/j.1365-246x.2010.04843.x
复制
发表时间：
2011-02
影响因子：
2.8
通讯作者：
R. Ogawa;B. Chao;K. Heki
中科院分区：
文献类型：
--
作者：
R. Ogawa;B. Chao;K. Heki
概要我们使用GRACE（重力恢复和气候实验）卫星使命的6年的数据，产生估计的年际信号的重力变化。我们解决这样的信号的形式不仅是线性趋势，但也二次项（加速/减速）的质量变化在全球范围内的空间分辨率为500公里。在大陆上，它们意味着水文物质输送，其中降水量减去蒸散量的任何线性趋势都是大陆储水量和重力的二次变化的输入，因此也是其原因。二次（代表加速/减速）条款的地理格局的比较研究表明有趣的协议的水文模型GLDAS与GRACE数据在许多主要领域，提供独立的评估，以质量和有效性的水文模型的年际应用。
SUMMARY We use 6 yr of data of the GRACE (Gravity Recovery and Climate Experiment) satellite mission, which yield estimation for interannual signals in gravity changes. We solve for such signals in the form of not only linear trend but also quadratic term (acceleration/deceleration) of mass variations globally at a spatial resolution of 500 km. On continents they signify hydrological mass transport, where any linear trend in precipitation minus evepotranspiration is the input to and hence responsible for, the quadratic change in continental water storage and hence in gravity. Comparison studies of geographical patterns of the quadratic (representing acceleration/deceleration) terms show interesting agreement of the hydrological model GLDAS with GRACE data in many major areas, providing independent assessment as to the quality and validity of the hydrological models for interannual applications.