This research is cosponsored by the grants of the National Basic Research Program (2013CB430304), National Natural Science Foundation (41030854, 41106005, 41176003, and 41206178), National High-Tech R&D Program (2013AA09A505), and National Polar Science Strategic Research Foundation (20100209) of China. This research is also sponsored by the NSF Grant of the United States (0968383).
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Note that the RMSE in Figs. 3–6 and 9 is different from that in Figs. 2, 7, and 10 that use Eq. (4). At a given analysis step the RMSE is normally defined as