A comparison of methods for a priori bias correction in soil moisture data assimilation

被引:113
作者
Kumar, Sujay V. [1 ,2 ]
Reichle, Rolf H. [3 ]
Harrison, Kenneth W. [2 ,4 ]
Peters-Lidard, Christa D. [2 ]
Yatheendradas, Soni [2 ,4 ]
Santanello, Joseph A. [2 ]
机构
[1] Sci Applicat Int Corp, Beltsville, MD USA
[2] NASA, Goddard Space Flight Ctr, Hydrol Sci Lab, Greenbelt, MD 20771 USA
[3] NASA, Goddard Space Flight Ctr, Global Modeling & Assimilat Off, Greenbelt, MD 20771 USA
[4] Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA
关键词
LAND INFORMATION-SYSTEM; PARAMETER-ESTIMATION; HYDRAULIC-PROPERTIES; SURFACE MODEL; WATER; UNCERTAINTY; FRAMEWORK; IMPACT; FILTER; STATES;
D O I
10.1029/2010WR010261
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Data assimilation is increasingly being used to merge remotely sensed land surface variables such as soil moisture, snow, and skin temperature with estimates from land models. Its success, however, depends on unbiased model predictions and unbiased observations. Here a suite of continental-scale, synthetic soil moisture assimilation experiments is used to compare two approaches that address typical biases in soil moisture prior to data assimilation: (1) parameter estimation to calibrate the land model to the climatology of the soil moisture observations and (2) scaling of the observations to the model's soil moisture climatology. To enable this research, an optimization infrastructure was added to the NASA Land Information System (LIS) that includes gradient-based optimization methods and global, heuristic search algorithms. The land model calibration eliminates the bias but does not necessarily result in more realistic model parameters. Nevertheless, the experiments confirm that model calibration yields assimilation estimates of surface and root zone soil moisture that are as skillful as those obtained through scaling of the observations to the model's climatology. Analysis of innovation diagnostics underlines the importance of addressing bias in soil moisture assimilation and confirms that both approaches adequately address the issue.
引用
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页数:16
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