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CHEN Chuntao, ZHU Jianhua, ZHAI Wanlin, YAN Longhao, ZHAO Yili, HUANG Xiaoqi, YANG Weiwei. Absolute calibration of HY-2A and Jason-2 altimeters for sea surface height using GPS buoy in Qinglan, China[J]. HaiyangYuHuZhao, 2019, 37(5): 1533-1541

Absolute calibration of HY-2A and Jason-2 altimeters for sea surface height using GPS buoy in Qinglan, China

CHEN Chuntao, ZHU Jianhua, ZHAI Wanlin, YAN Longhao, ZHAO Yili, HUANG Xiaoqi, YANG Weiwei
National Ocean Technology Center, Ministry of Natural Resources(MNR), Tianjin 300112, China
GPS buoy methodology is one of the main calibration methodologies for altimeter sea surface height calibration. This study introduces the results of the Qinglan calibration campaign for the HY-2A and Jason-2 altimeters. It took place in two time slices; one was from August to September 2014, and the other was in July 2015. One GPS buoy and two GPS reference stations were used in this campaign. The GPS data were processed using the real-time kinematic (RTK) technique. The final error budget estimate when measuring the sea surface height (SSH) with a GPS buoy was better than 3.5 cm. Using the GPS buoy, the altimeter bias estimate was about -2.3 cm for the Jason-2 Geophysical Data Record (GDR) Version ‘D’ and from -53.5 cm to -75.6 cm for the HY-2A Interim Geophysical Data Record (IGDR). The bias estimates for Jason-2 GDR-D are similar to the estimates from dedicated calibration sites such as the Harvest Platform, the Crete Site and the Bass Strait site. The bias estimates for HY-2A IGDR agree well with the results from the Crete calibration site. The results for the HY-2A altimeter bias estimated by the GPS buoy were verified by cross-calibration, and they agreed well with the results from the global analysis method.
Key words:    HY-2A altimeter|calibration|GPS buoy|sea surface height|Jason-2 altimeter   
Received: 2018-08-29   Revised: 2018-11-21
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Articles by CHEN Chuntao
Articles by ZHU Jianhua
Articles by ZHAI Wanlin
Articles by YAN Longhao
Articles by ZHAO Yili
Articles by HUANG Xiaoqi
Articles by YANG Weiwei
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