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本文分析研究了1998~2006年热带及副热带TMI反演获得的海温资料(TMISST)和Hadley中心海温资料(HadISST1)在气候尺度上的异同.研究结果表明,TMISST和HadISST1均能反映热带及副热带海温的气候态分布特征,也都能指示其海温的异常变化.但是,两种海温资料之间仍然存在一定的差异,主要表现为TMISST较HadISST1偏高.此外,两者差异不仅存在明显的地域性特征,而且存在明显的季节变化:夏季两种海温资料的差异最大,秋季最小,但各季均有30%以上格点的差值在0.3℃以上.对两种海温资料距平场的EOF分析亦明确显示HadISST1和TMISST存在差异,HadISST1所反映的统计特征较TMISST更加细致.由于TMISST的反演基于一套综合性算法,其反演结果受到其他诸如风速、水汽、云水或降水等大气参数的干扰,进而造成HadISST1和TMISST的差异,且这些因素还造成了两者偏差水平分布的地域性特征.同时,也正是这些因素和海温垂直结构的季节变化,导致了两者偏差存在明显的季节变化.此外,在大陆近海区域,由于TMI信号受到污染,海温反演存在一定的缺陷,导致两者的差别较大,因此,在近海区域TMISST要慎用.
This paper analyzes the similarities and differences of climatic scales between the sea surface temperature data (TMISST) and the Hadley center sea surface temperature data (HadISST1) obtained from the tropical and subtropical TMI inversion from 1998 to 2006. The results show that both TMISST and HadISST1 can reflect the tropical and However, there are still some differences between the two SST data, mainly because TMISST is higher than that of HadISST 1. In addition, the difference between the two is not only notable There are obvious regional characteristics, and there are obvious seasonal changes: the difference between the two sea temperature data is the largest in summer and the smallest in autumn, but the difference of more than 30% of the grid points in each season is above 0.3 ℃. The EOF analysis of the data anomaly also clearly shows that there is a difference between HadISST1 and TMISST, and the statistical characteristics reflected by HadISST1 are more detailed than that of TMISST.Because the TMISST inversion is based on a comprehensive set of algorithms, the inversion results are affected by other wind speed, water vapor, Cloud water or precipitation and other atmospheric parameters of the interference, and then caused the difference between HadISST1 and TMISST, and these factors also contributed to the regional distribution of the deviation of the two regional characteristics.At the same time, it is also these The seasonal variation of the vertical structure of SST and SST results in significant seasonal variation in the deviation between the SST and SST.In addition, in the coastal area of the mainland, due to the TMI signal being contaminated, SST inversion has certain defects, resulting in a large difference between the two Therefore, TMISST should be used with caution in offshore areas.