Calibrating the Haiyang-2A Calibration Microwave Radiometer When the 18.7-GHz Band Fails
Calibrating the Haiyang-2A Calibration Microwave Radiometer When the 18.7-GHz Band Fails
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18.7GHz频段故障时校准Haiyang-2A校准微波辐射计
DOI:
10.1109/tgrs.2021.3073278
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发表时间:
2022
影响因子:
8.2
通讯作者:
Maorong Ge
中科院分区:
文献类型:
--
作者:
Zhilu Wu;Yanxiong Liu;Yang Liu;Jungang Wang;Xiufeng He;Wenxue Xu;Maorong Ge
The wet tropospheric correction (WTC) retrieved from the onboard calibration microwave radiometer (CMR) of Haiyang-2A (HY-2A) is critical in monitoring the global sea level. However, the CMR WTC became significantly biased from June 2017 due to the failure of the 18.7-GHz band, which caused massive errors in the sea surface height (SSH) measurements. We investigate the accuracy of the CMR WTC derived from the two remaining bands to address this problem. A comprehensive evaluation using multisource data demonstrates that the dual-band + backscattering coefficient (BC) algorithm achieves comparable accuracy to the three-band algorithm, and it does not suffer from any large errors when the equipment works well. Hence, we calibrated the HY-2A CMR data with the dual-band + BC algorithm when the 18.7-GHz band failed, and the accuracy of the CMR WTC is improved from 2.34 to 1.39 cm compared with European Center for Medium-Range Weather Forecasts (ECMWF) ERA5 data. In addition, the SSH measurements are improved significantly by a maximum of 2 cm in mean value using the dual-band + BC WTC during the failure period of HY-2A CMR. Compared with Jason-3 SSH measurements, the HY-2A with dual-band + BC shows a slightly larger difference than HY-2A with three-band by 0.1 cm in rms. This method prolongs the operational lifetime of the HY-2A CMR and could be used in the reprocessing of HY-2A observations.
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DOI:
10.1109/36.317444
发表时间:
1993-11
期刊:
IEEE Trans. Geosci. Remote. Sens.
影响因子:
--
作者:
R. Bernard;A. L. Cornec;L. Eymard;L. Tabary
通讯作者:
R. Bernard;A. L. Cornec;L. Eymard;L. Tabary
影响因子:
1.6
作者:
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通讯作者:
A. Sibthorpe;Shannon T. Brown;S. Desai;B. Haines
影响因子:
5.2
作者:
B. Haines;Y. Bar-Sever
通讯作者:
B. Haines;Y. Bar-Sever
DOI:
10.3390/rs8100851
发表时间:
2016-10
期刊:
Remote. Sens.
影响因子:
--
作者:
M. Fernandes;C. Lázaro
通讯作者:
M. Fernandes;C. Lázaro
影响因子:
2.2
作者:
G. Zheng;Jingsong Yang;L. Ren
通讯作者:
G. Zheng;Jingsong Yang;L. Ren