The validation of the significant wave height product of HY-2 altimeter-primary results
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The validation of the significant wave height product of HY-2 altimeter–primary results CHEN Chuntao1 , ZHU Jianhua1∗ , LIN Mingsen2 , ZHAO Yili1 , HUANG Xiaoqi1 , WANG He1 , ZHANG Youguang2 , PENG Hailong2 1 2
National Ocean Technology Center, State Oceanic Administration, Tianjin 300112, China National Satellite Ocean Application Service of State Oceanic Administration, State Oceanic Administration, Beijing 100081, China
Received 25 August 2012; accepted 7 April 2013 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2013
Abstract The HY-2 satellite was successfully launched on 16 August 2011. The HY-2 significant wave height (SWH) is validated by the data from the South China Sea (SCS) field experiment, National Data Buoy Center (NDBC) buoys and Jason-1/2 altimeters, and is corrected using a linear regression with in-situ measurements. Compared with NDBC SWH, the HY-2 SWH show a RMS of 0.36 m, which is similar to Jason-1 and Jason-2 SWH with the RMS of 0.35 m and 0.37 m respectively; the RMS of corrected HY-2 SWH is 0.27 m, similar to 0.27 m and 0.23 m of corrected Jason-1 and Jason-2 SWH. Therefore the accuracy of HY-2 SWH products is close to that of Jason-1/2 SWH, and the linear regression function derived can improve the accuracy of HY-2 SWH products. Key words: altimeter, significant wave height, validation, linear regression, correction, root mean square Citation: Chen Chuntao, Zhu Jianhua, Lin Mingsen, Zhao Yili, Huang Xiaoqi, Wang He, Zhang Youguang, Peng Hailong. 2013. The validation of the significant wave height products of HY-2 altimeter–primary results. Acta Oceanologica Sinica, 32(11): 82-86, doi: 10.1007/s13131-013-0381-6
1 Introduction Altimeters onboard Geos-3, Seasat, Geosat, TOPEX/Poseidon, ERS-1/2, Jason-1/2 and Envisat have provided continuous wave height and wind speed measurements over more than a 20-year time period. Today, with the successful launch of HY-2, on 16 August 2011, three altimeters are in-orbit simultaneously. After 1990, satellite ocean remote sensing has been developing very fast. One of most important characteristic was the change from the experimental ocean satellite to the operational ocean satellite (Fang, 2003). The satellite altimeter operation benefits from its continuously improving measurement accuracy. With the improvement of accuracy of the altimeter observations and data processing methods, the altimeter data have been widely used in various fields, such as the oceanography, geodesy and geophysics. Qi et al. (1998) used the Geosat altimeter data to study the characteristics of sea wave over the South China Sea. Qiu (2005) used the altimeter data to study the variability of Kuroshio in the south ocean of Japan; Chen (2010) used the altimeter data to analyze the variation of the Kuroshio axis and the frontal eddy. The application of altimeter SWH measurements to numerical ocean models also has grown dramatically. The ERS-2 (since January 1996) and Envisat fast delivery altimeter SWH data are assimilated in the ECMWF numerical wave model
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