热带太平洋10月份海气联合复EOF分析

CEOF analysis for coupled circulation of atmosphere and ocean of Tropical Pacific Ocean in October

利用复EOF分析,将热带太平洋10月份的大气环流风场和大洋上层环流场作为一个整体,对其作了动力统计诊断,用以考察热带太平洋10月份大气大洋耦合环流的年际和年代际变化,并揭示其与厄尔尼诺和南方涛动(ENSO)的关系。结果表明:在同一模态中,海洋模态表现出很强的赤道陷度特征,而大气风场则无此现象;第一模态与ENSO循环有密切关系,揭示了Walker环流异常;第一模态的垂直运动风场反映了热带太平洋赤道辐合带和南太平洋辐合带上垂直运动的异常;第二模态偏差风场的经向分量大于第一模态,反映了Hadley环流的异常;第二模态与ENSO循环有联系,但关系不如第一模态那样密切。

In this paper, using CEOF analysis, the dynamic statistic diagnosis of the circulation of atmosphere and ocean of tropical Pacific Ocean in October regarded as a whole is done, where through which inter-decadal and decadal variations of the coupled circulation are discussed and the relationship of ENSO is discovered. The results show that in the same mode, the deviation current of ocean is captured by equator, but wind field has no such phenomena; the first mode has close relation with ENSO, the atmosphere field represents the abnormal changes of Walker circulation; the vertical motion of atmosphere in the first mode reflects the abnormal vertical motion of equatorial and south pacific belts of convergence; in the second mode, the meridional ponderance of atmosphere field is bigger than that in the first mode, which reflects the abnormal changes of Hadley circulation; the second mode also has relation with ENSO, but the relationship is not so close as the first mode.