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基于全球海洋资料同化系统(BCC_GODAS2.0)的20年(1990～2009年)再分析资料,利用OISST和SODA数据集从整体上进行检验,分析同化产品误差特征表明,同化系统能够有效改进海洋温度和盐度的估计,尤其在赤道东太平洋地区最为显著.垂向温盐总体RMSE相对同化前分别减小0.53℃和0.28psu,相对第一代同化系统BCC_GODAS1.0,温盐各层RMSE均有不同程度的减小.然后利用HadISST数据对比分析了热带太平洋海温异常变化特征.同化结果的Nio3指数与HadISST的海表温度异常有很好的一致性,相关系数高达93.6%;同化结果很好地模拟出了观测HadISST赤道太平洋季节变化特征,而赤道东太平洋地区逐月SSTA标准差季节变化的幅度变化较美国GODAS更接近HadISST;此外,同化在热带太平洋SSTA年际变率的EOF第一主模态所表现的ElNio空间结构,改善了冷舌地区的正异常年际变率强度,第二模态所表现的El Nio Modoki空间结构,改善了赤道东太平洋负异常局限于狭窄赤道地区的问题,并且赤道中太平洋海温正异常向南北高纬地区延伸的幅度和强度都得到加强,与观测HadISST比较吻合.
Based on the 20-year (1990-2009) reanalysis data of the Global Ocean Data Assimilation System (BCC_GODAS2.0), the data were tested using OISST and SODA data sets. The analysis of the error characteristics of assimilation products shows that the assimilation system can effectively improve the sea temperature And salinity, especially in the eastern equatorial Pacific.The total RMSE of vertical temperature and salinity decreased by 0.53 ℃ and 0.28psu respectively before the relative assimilation of vertical temperature and salinity, compared with the first-generation assimilation system BCC_GODAS1.0, Then the variation of SST anomaly in the tropical Pacific was compared and analyzed by HadISST data.The Ni o3 index of assimilation results was in good agreement with the HadISST SST anomaly with a correlation coefficient of up to 93.6% The seasonal variation of Hadisst equatorial Pacific was well simulated. However, the seasonal change of SSTA standard deviation of monthly equatorial Pacific was closer to HadISST than that of the United States GODAS. In addition, the seasonal variation of SSTA in the eastern equatorial Pacific was similar to that of HadISST. The ElNio spatial structure represented by a dominant mode improves the positive anomalous interannual variability in the cold tongue region. The El Nio Modoki Between structure, improve the equatorial eastern Pacific the negative anomalies limited to the narrow issue of the equator, and the magnitude and intensity of the central equatorial Pacific SST positive anomalies extending to high latitudes north and south have been strengthened, and the observation HadISST good agreement.