Rapid calibration of HY-2A satellite-borne microwave radiometer using coastal GNSS observations
Rapid calibration of HY-2A satellite-borne microwave radiometer using coastal GNSS observations
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利用沿海GNSS观测数据快速校准HY-2A星载微波辐射计
DOI：
10.1007/s00190-022-01617-w
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发表时间：
2022-04
影响因子：
4.4
通讯作者：
Wenxue Xu
中科院分区：
文献类型：
--
作者：
Zhilu Wu;Yanxiong Liu;Yang Liu;Cuixian Lu;Xiufeng He;Ke Jin;Wenxue Xu
星载微波辐射计为测高观测提供湿对流层校正（WTC），这对高精度海面高度（SSH）测量至关重要。然而，据报道，海洋-2A（HY-2A）校准微波辐射计（CMR）经历了突然的18.7 GHz频段故障。全球导航卫星系统（GNSS）可以提供具有高时间分辨率的（近）实时精确的WTC。在这项研究中，2017年1月至2018年2月全球132个沿海站点的GNSS观测数据用于CMR验证和校准。此外，欧洲中期天气预报中心（ECMWF）同期的产品也被用于比较。经GNSS观测校正后，CMR和ECMWF之间的WTC差异的均方根（RMS）从2.53 cm减小到1.66 cm。经ECMWF产品标定后，ECMWF标定的CMR与ECMWF的WTC差值的RMS为1.54cm。此外，不同的处理策略的WTC适用于SSH测量。用ECMWF校准的CMR获得的SSH平均海平面异常（SLA）值与GNSS校准的CMR WTC和ECMWF WTC获得的结果相当。此外，与Jason-3的SLA相比，使用ECMWF WTC获得的HY-2A的SLA显示出最小的RMS差异为7.79 cm，比使用ECMWF校准的CMR WTC获得的SLA小0.1 cm，比使用GNSS校准的CMR WTC获得的SLA小0.23 cm。使用GNSS校准的CMR WTC后，使用原始CMR WTC获得的SLA（以RMS计）减少了约0.8 cm。因此，即使具有地基GNSS的已知限制（在陆地上而不是在海洋上的非同位测量），由于GNSS观测的较低延迟，它确实可以用作辐射计校准的有价值的WTC源。
Satellite-borne microwave radiometers provide wet tropospheric correction (WTC) for altimetry observations, which is critical to high-accuracy sea surface height (SSH) measurements. However, it was reported that the Haiyang-2A (HY-2A) calibration microwave radiometer (CMR) experienced abrupt 18.7 GHz band failure. The global navigation satellite system (GNSS) can provide (near) real-time accurate WTC with high temporal resolutions. In this study, GNSS observations of 132 global coastal sites from January 2017 to February 2018 are used for CMR validation and calibration. In addition, the European Centre for Medium-Range Weather Forecasts (ECMWF) products during the same period are also used for comparison. After calibration with GNSS observations, the root-mean-square (RMS) of the WTC differences between CMR and ECMWF decreases from 2.53 to 1.66 cm. After calibration with ECMWF products, the RMS of the WTC differences between ECMWF-calibrated CMR and ECMWF is 1.54 cm. Moreover, different processing strategies of WTC are applied to SSH measurements. The mean sea level anomaly (SLA) values of SSH obtained with ECMWF-calibrated CMR are comparable to those obtained with GNSS-calibrated CMR WTC and with ECMWF WTC. In addition, compared to the SLAs of Jason-3, the SLAs of HY-2A obtained with ECMWF WTC show the smallest differences of 7.79 cm in RMS, which are 0.1 cm smaller than those obtained with ECMWF-calibrated CMR WTC and 0.23 cm smaller than those obtained with GNSS-calibrated CMR WTC. The SLAs obtained with original CMR WTC are reduced by approximately 0.8 cm in RMS after using GNSS-calibrated CMR WTC. Therefore, even with the known limitations of ground-based GNSS (non-collocated measurements over land instead of over ocean), it can indeed serve as a valuable WTC source for radiometer calibration due to the lower latency of GNSS observations.
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影响因子：
1.6
作者：
A. Sibthorpe;Shannon T. Brown;S. Desai;B. Haines
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
影响因子：
5.1
作者：
Xingwei Jiang;Mingsen Lin;Jianqiang Liu;Youguang Zhang;Xuetong Xie;Hailong Peng;Wu Zhou
通讯作者：
Xingwei Jiang;Mingsen Lin;Jianqiang Liu;Youguang Zhang;Xuetong Xie;Hailong Peng;Wu Zhou
DOI：
10.1029/2018jd028320
发表时间：
2018-08
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
--
作者：
Xingxing Li;Han Tan;Xin Li;G. Dick;J. Wickert;H. Schuh
通讯作者：
Xingxing Li;Han Tan;Xin Li;G. Dick;J. Wickert;H. Schuh
DOI：
--
发表时间：
1992
期刊：
--
影响因子：
--
作者：
Jiun-Tsong Wu;Sien-Chong Wu;G. Hajj;W. Bertiger;S. Lichten
通讯作者：
Jiun-Tsong Wu;Sien-Chong Wu;G. Hajj;W. Bertiger;S. Lichten