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
Maorong Ge
中科院分区:
工程技术1区
文献类型:
--
作者:
Zhilu Wu;Yanxiong Liu;Yang Liu;Jungang Wang;Xiufeng He;Wenxue Xu;Maorong Ge

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海洋二号A星载校准微波辐射计(CMR)反演的湿对流层改正(WTC)是监测全球海平面的关键。然而,由于18.7 GHz频段的故障,CMR WTC从2017年6月开始出现严重偏差,导致海面高度(SSH)测量出现巨大误差。我们调查的准确性CMR WTC来自剩余的两个波段,以解决这个问题。利用多波段数据进行的综合评价表明,双波段+后向散射系数(BC)算法达到了与三波段算法相当的精度,并且在设备工作正常的情况下,不会产生任何大的误差。因此,我们校准HY-2A CMR数据与双波段+ BC算法时,18.7-GHz频段失败,CMR WTC的精度从2.34提高到1.39厘米相比,欧洲中期天气预报中心(ECMWF)ERA 5的数据。此外,在HY-2A CMR故障期间,使用双波段+ BC WTC的SSH测量值显著改善,平均值最大为2 cm。与Jason-3 SSH测量相比,HY-2A双波段+ BC显示出比HY-2A三波段略大0.1 cm的均方根差异。该方法可缩短HY-2A CMR的工作寿命,并可用于HY-2A观测数据的后处理。
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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