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中国近海海面高度异常资料再处理

         
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摘要

卫星海面高度异常产品再处理的研究多集中在欧洲和美国近海，中国近海尚未有过。在产生AVISO(Archiving Validation and Interpolation of Satellite Oceanographic Data)全球0.25°多颗卫星海面高度异常产品时，只用了1/3~1/2的部分沿轨资料，给区域海洋动力学研究造成了一定的限制。本研究尝试利用多颗卫星的所有沿轨资料及25个测潮站的观测资料，通过最优插值方法产生一份新的中国近海海面高度异常资料。新资料的空间分辨率仍为0.25°，但使用了来自3颗卫星(Jason-1、Jason-2、CryoSat-2)的所有沿轨资料及25个测潮站的观测资料。新资料的范围为10°S~50°N、90°~160°E。新资料与AVISO资料的对比分析表明新资料更接近沿轨海面高度异常观测，同时也更接近测潮站资料。与AVISO资料相比，新资料与沿轨海面高度异常观测的均方根误差降低了10.03%，与测潮站资料的均方根误差降低了9.6%。%Research on reprocessing of satellite level anomalies have mainly focused on European and US coastal regions and to date no studies have been based on satellite sea surface height observations for the Chinese coastal region. Only 50% or 33% of along-track data were used when generating the AVISO(Archiving Validation and In-terpolation of Satellite Oceanographic Data) 0.25 degree global sea level anomaly product, which caused certain restrictions in the regional application of the product. This study aims to use an optimal interpolation method with three satellite along-track observations and 25 tide gauge station observations to generate a new sea level anomaly product for the Chinese coastal region. The spatial resolution of the new data product is still 0.25 degrees, but in this study, all along-track observations from three satellites (Jason-1, Jason-2, and CryoSat-2) and 25 tide gauge stations are used. Our method is validated using data from 2012, and the domain of the new data product is 10°S~50°N and 90°E~160°E. The new data product is also validated using the AVISO product, along-track obser-vations, and tidal gauge observations, and the analysis indicates that it is closer not only to along-track satellite ob-servations but also to tide gauge station observations. In comparison with the AVISO product, the root mean square error (RMSE) between the new product and along-track satellite observations is reduced by 10.03%, and the RMSE between the new product and tidal gauge observations is reduced by 9.6%.

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