【作者】 李明；

【导师】 吴洪宝；

【作者基本信息】 南京气象学院 ， 气象学， 2003， 硕士

【摘要】 本文根据NCEP/NCAR再分析海温、850hpa风场资料以及FSU风应力资料，利用诊断分析和数值模拟方法研究了热带太平洋风应力(风)场和海温的相互作用的关系。研究结果表明，前期风应力距平场与Nino3区SSTA有很好的相关关系，这种相关性超前8个月时就有所显现。影响Nino3区SSTA的纬向风应力区域的位置随风应力超前的时间缩短由东太平洋向中太平洋扩展，经向风应力区域的位置由东太平洋和西太平洋向中太平洋移动。数值试验试验结果表明，强相关区域的风应力对形成和维持热带太平洋SST的气候场的作用不明显，而对SST的年际变率有重要贡献；相反，强相关区域以外的风应力对形成和维持热带太平洋SST的气候场起重要作用，但是对SST的年际变率所起的作用很不理想。在风应力场和海温场SVD分析的基础上所作的数值试验证实，只在协方差平方和贡献最大的前4个风应力场的强迫下就可形成与实际相符的气候平均海温场和海温异常。对El Nino类型的研究中发现，80年代以前以东部型为主，80年代以后以中部型为主，并且两类El Nino前期的低层风场的特征也有很大的不同。此外，平均而言，风应力场对两类El Nino作用的关键区也有所不同，而且纬向风应力对东部型El Nino有重要作用，经向风应力对中部型El Nino的产生则起着至关重要的作用。更多还原

【Abstract】 This paper studies the interaction relationship between the Wind Stress (wind) field over the tropical Pacific and SST by use of the diagnostic analysis and numerical simulation on the basis of SST,850hpa wind data from NCEP/NCAR and FSU wind stress data. The results show that the leading wind stress anomalies field is correlated well with Nino3 SSTA and the correlation has appeared when the wind stress is prior to Nino3 SSTA by 8 months. With the reduction of the leading time, the location of the zonal wind stress area influencing Nino3 SSTA expands toward the middle Pacific from the eastern Pacific, as well as the meridional wind stress in the eastern Pacific and the western Pacific. Numerical studies suggest that the wind stress over strong correlation areas which contributes to the interannual variance of SST is of little role on the development and maintenance of climatological state of the tropical Pacific, Instead of the wind stress over non-strong correlation areas. The numerical tests on the basis of SVD analysis between the wind stress over the tropical Pacific and SST demonstrate that the tropical Pacific only forced by the first 4 wind stress with the biggest percentage of the sum of square covariance can form climatological field and SST anomalies almost coincident with the practical cases. Also find that there mainly occur the eastern El Nino before 1980s, instead , mainly occurring the middle El Nino before 1980s, and there are obvious differences for the leading wind field pattern associated with the two kinds of El Nino events. Moreover, as for average state, the crucial areas of wind stress acting on the two kinds of El Nino exist different sites, and the zonal wind stress play a important role on eastern El Nino models, the meridional wind stress ,however, play a significant effect on the middle El Nino models.更多还原