Wet Tropospheric Correction of Wide-swath Altimeter by Optimum Interpolation Method

被引：0
|
作者：
Zhou M. [1 ]
Jin T. [1 ,2 ]
Jiang W. [2 ,3 ]
机构：
[1] School of Geodesy and Geomatics, Wuhan University, Wuhan
[2] Hubei LuoJia Laboratory, Wuhan
[3] GNSS Research Center, Wuhan University, Wuhan
来源：
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | 2023年 / 48卷 / 06期
关键词：
ERA5; optimum interpolation; radiometer; wet tropospheric correction; wide-swath altimeter;
D O I：
10.13203/j.whugis20210008
中图分类号：
学科分类号：
摘要：
Objectives: Since there is only nadir radiometer onboard for the wide-swath altimetry, the wet tropospheric delay can only be corrected by models inside the cross-swath or substituted by the nadir radiometer measured data, which lead to the lower accuracy.Methods: In order to improve the accuracy of wet tropospheric correction (WTC) inside the cross-swath, an optimum interpolation method to fuse the nadir radiometer WTC is proposed, and it is verified by taken the SWOT (surface water and ocean topography) wide-swath altimeter as example.Results: Inside the cross-swath, when the ERA5 (ECMWF reanalysis 5th generation) data are used, the residual of WTC after correction by optimum interpolation method can be reduced by 40% compared with the nadir radiometer WTC substituted. When the simulated WTCs from the spectrum of radiometer measured WTCs are used, the residual of WTC after correction by optimum interpolation method can be reduced by 80% in all latitude areas compared with the nadir radiometer WTC substituted.Conclusions: The optimum interpolation method has much better accuracy than the nadir radiometer WTC substituted in the case of high water vapor variability. © 2023 Wuhan University. All rights reserved.
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页码：911 / 918
页数：7
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