Independent Validation of Jason-2/3 and HY-2B Microwave Radiometers Using Chinese Coastal GNSS

doi:10.1109/TGRS.2021.3106650

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	Independent Validation of Jason-2/3 and HY-2B Microwave Radiometers Using Chinese Coastal GNSS
	Zhu, Lin 1,2; Yang, Lei 2; Xu, Yongsheng 5; Zhang, Huayi 2; Wu, Zhilu 4; Wang, Zhaohui 3
刊名	IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
	2021-09-01
页码	11
关键词	Global navigation satellite system Radiometers Sea measurements Satellite broadcasting Microwave radiometry Oceans Microwave measurement Calibration and validation Crustal Movement Observation Network of China (CMONOC) global navigation satellite system (GNSS) wet path delay (WPD) microwave radiometer satellite altimetry
ISSN号	0196-2892
DOI	10.1109/TGRS.2021.3106650
通讯作者	Yang, Lei(leiyang@fio.org.cn)
英文摘要	Validating the wet path delay (WPD) is essential to determining satellite microwave radiometer errors that may deteriorate sea level measurement accuracy. The global navigation satellite system (GNSS) is a favored method for assessing WPD for altimetry. Over Chinese coastal waters, however, validations have not been performed, primarily because of the large gaps between International GNSS Service sites. Herein, we report a long-term assessment of the Jason-2/3 radiometers and the initial performance of the Chinese HY-2B radiometer via comparisons of WPD values derived from three types of GNSS networks along the Chinese coast. A new method based on the second-order derivative of WPD along satellite tracks was developed to detect where land contamination first appears. The results indicate that this method is more sensitive to land influences; the distance at which land contamination first appears was estimated to be approximately 40-50 km over the China coast sea. To compare the WPD at different heights, such as GNSS sites and sea level surface, an exponential function containing the corresponding decay coefficients was adopted. The WPD decay coefficients for each GNSS site were recalculated using the 3-D ERA5 pressure level fields instead of the empirical value of 2000. The results show that the new coefficient may reduce the differences between WPD values at different heights. This WPD comparison over Chinese coastal waters indicates average WPD differences of 3 (Jason-2) and -1 mm (Jason-3), showing a high level of consistency between the GNSS sites and the satellite radiometers. The uncertainties in the WPD differences were estimated to be 14-21 and 7-24 mm for the Jason-2/3 and HY-2 radiometers, respectively, which is consistent with previous studies using global GNSS. After removing the GNSS uncertainty and the spatial decorrelation, the WPD uncertainties of the Jason-2, Jason-3, and HY-2 radiometers over the regional area were estimated to be 13, 14, and 11 mm, respectively. The long-term evaluation of the WPD differences with the GNSS sites indicates that the drift rates of the Jason-2/3 radiometers over China coast waters are 0.3 and -0.9 mm/y, respectively.
资助项目	National Natural Science Foundation of China[41806214] ; National Natural Science Foundation of China[41676168] ; Key Laboratory of Marine Environmental Survey Technology and Application Ministry of Natural Resource[MESTA2020-B010]
WOS研究方向	Geochemistry & Geophysics ; Engineering ; Remote Sensing ; Imaging Science & Photographic Technology
语种	英语
出版者	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
WOS记录号	WOS:000732909900001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/177566]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Yang, Lei
作者单位	1.Shandong Univ Sci & Technol, Coll Geomat, Qingdao 266590, Peoples R China 2.Minist Nat Resources, Inst Oceanog 1, Marine Survey Res Ctr, Qingdao 266061, Peoples R China 3.Natl Satellite Ocean Applicat Serv, Beijing 100081, Peoples R China 4.Wuhan Univ, Sch Geodesy & Geomat, Wuhan 430070, Peoples R China 5.Chinese Acad Sci, Lab Ocean & Climate Dynam, Inst Oceanol, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Lin,Yang, Lei,Xu, Yongsheng,et al. Independent Validation of Jason-2/3 and HY-2B Microwave Radiometers Using Chinese Coastal GNSS[J]. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,2021:11.
APA	Zhu, Lin,Yang, Lei,Xu, Yongsheng,Zhang, Huayi,Wu, Zhilu,&Wang, Zhaohui.(2021).Independent Validation of Jason-2/3 and HY-2B Microwave Radiometers Using Chinese Coastal GNSS.IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,11.
MLA	Zhu, Lin,et al."Independent Validation of Jason-2/3 and HY-2B Microwave Radiometers Using Chinese Coastal GNSS".IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING (2021):11.