On the joint estimation of model and satellite sea surface height anomaly errors

被引:32
作者
Tokmakian, R. [1 ]
Challenor, P. G. [2 ]
机构
[1] USN, Postgrad Sch, Dept Oceanog, Monterey, CA 93943 USA
[2] Southampton Oceanog Ctr, James Rennell Div Ocean Circulat & Climate, Southampton, Hants, England
关键词
Modelling; Models; Ocean circulation; Altimetry; Sea level variations;
D O I
10.1016/S1463-5003(99)00006-2
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
We describe a technique to estimate the error field in the sea surface height (SSH) anomaly field of an ocean model through the joint use of SSH anomaly fields measured from two satellites, Topex/Poseidon (T/P) and ERS-2. The joint error maps for the model, T/P and ERS-2 show distributions distinctly different from one another and globally inhomogeneous. Both sampling errors and instrument errors are represented in the mapped fields. Additionally, we compare the joint error estimation method to a technique using the model and only one satellite, and show the importance of the cross covariance between the measured SSH and the true SSH field in the estimation of the error field. Finally, we look at the distribution of the error versus the variance of the SSH at a location. This logged distribution suggests that the model errors are generally proportional to the model's variance (regression coefficient of 0.99, globally) while the satellites' errors do not exhibit this linear relationship (regression coefficients on the average of 0.60). The comparison of the two satellite distributions implies that ERS-2 has a lower sampling error than the T/P instrument except in the tropical region. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:39 / 52
页数:14
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