Cite this paper:
Wanlin ZHAI, Jianhua ZHU, Xiaohui FAN, Longhao YAN, Chuntao CHEN, Zhen TIAN. Preliminary calibration results for Jason-3 and Sentinel-3 altimeters in the Wanshan Islands[J]. Journal of Oceanology and Limnology, 2021, 39(2): 458-471

Preliminary calibration results for Jason-3 and Sentinel-3 altimeters in the Wanshan Islands

Wanlin ZHAI1, Jianhua ZHU1, Xiaohui FAN2, Longhao YAN1, Chuntao CHEN1, Zhen TIAN1
1 National Ocean Technology Center, Tianjin 300112, China;
2 Tianjin Guohai Marine Engineering Survey Co. Ltd., Tianjin 300000, China
Abstract:
We present preliminary calibration results for Jason-3 and Sentinel-3A altimeters that we set up in the Wanshan Islands in Guandong Province, China. Two campaigns were carried out in 2018, from March 8 to April 16 and from November 3 to December 11, 2018. Three GPS reference stations and tide gauges were established on the islands of Zhiwan, Dangan, and Wailingding during the campaigns. The in-situ sea surface height (SSH) of the altimeter footprint was determined using the tide gauge. The tidal and geoid connection between the tide gauge locations and the altimeter footprints were computed with the NAO.99Jb tidal prediction system and the EGM 2008 geoid, respectively. The data of the tide gauges were defined using the GPS buoy and GPS reference stations during the campaigns. The results show that the waveform of the altimeters was slightly contaminated by the small islands. The bias associated with Jason-3 and Sentinel-3A amounted to approximately +20.7±49.7 mm and +30.1±39.4 mm, respectively, which agreed well with the results from other in-situ calibration fields. This indicates that the Wanshan area was very suitable as an in-situ calibration/validation field. The wet zenith delay (WZD) determined from the Microwave Radiometer (MWR) and the GPS measurements differed from each other for the Jason-3 and Sentinel-3A by -6.6±7.4 mm and 0±6.8 mm, respectively.
Key words:    altimeter calibration|tide gauge|GPS buoy|wet zenith delay   
Received: 2019-09-27   Revised: 2020-03-09
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Articles by Wanlin ZHAI
Articles by Jianhua ZHU
Articles by Xiaohui FAN
Articles by Longhao YAN
Articles by Chuntao CHEN
Articles by Zhen TIAN
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