Detectability assessment of interannual variations in terrestrial water storage from satellite gravimetry using an offline land surface model simulation
Detectability assessment of interannual variations in terrestrial water storage from satellite gravimetry using an offline land surface model simulation
复制标题
使用离线地表模型模拟通过卫星重力测量陆地水储量年际变化的可检测性评估
DOI：
10.1002/hyp.6096
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发表时间：
2006
影响因子：
3.2
通讯作者：
T. Nakaegawa
中科院分区：
文献类型：
--
作者：
T. Nakaegawa
采用日本气象厅-简单生物圈（JMA-SiB）模式，研究了卫星重力测量数据对70个流域陆地储水量年际变化的可探测性。根据JMA - SiB模式进行的10年整合的输出，计算了月、季和年平均时期的陆地储水量。假定卫星规格与NASA重力恢复和气候实验（GRACE）相同。计算了每个流域每个时期卫星-重力法计算的陆地储水量的总误差（包括仪器误差、大气误差和冰川后反弹误差）。在大陆尺度的河流流域，对月、季、年三种不同时间尺度的年际变化标准差和总误差进行了精确比较。误差信号比（即总误差与标准偏差的比值）用于评估可检测性。结果表明，重力卫星任务能够探测到大流域大部分年份的年际变化，而对小流域的年际变化，重力卫星任务能够探测到的年际变化概率为3年或以上的1年。这些特征在所有三个平均时间尺度上都存在。版权所有©2006约翰威利父子有限公司
The detectability of the interannual variations of terrestrial water storage in 70 river basins acquired by satellite gravimetry was investigated using the Japan Meteorological Agency–Simple Biosphere (JMA–SiB) model. Terrestrial water storages for the monthly, seasonal, and annual averaging periods were computed from the output of a 10 year integration performed by the JMA‐SiB model. The satellite specification was assumed to be the same as for the NASA Gravity Recovery and Climate Experiment (GRACE). The total errors in the satellite‐gravimetry‐derived terrestrial water storage (including the instrument error, atmospheric error, and error due to the postglacial rebound) were computed for each period at each basin. The standard deviation of the interannual variation with the total error for three different time scales, averaging monthly, seasonal and annual results, was compared precisely in the continental‐scale river basins. The error‐signal ratio (i.e. the ratio of the total error to the standard deviation) was used to assess the detectability. The results demonstrate that the gravity satellite missions can detect the interannual variations in large river basins in most years, but the gravity satellite missions can detect those in small river basins only with the probability of 1 year out of 3 years or more. These characteristics were found in all the three averaging time scales. Copyright © 2006 John Wiley & Sons, Ltd.
影响因子：
56.9
作者：
Tapley, BD;Bettadpur, S;Watkins, MM
通讯作者：
Watkins, MM