热带太平洋与印度洋相互作用的年代际变化

利用全球海表海温资料（GISST）和NCEP／NCAR再分析资料，研究了热带太平洋与印度洋之间的相互作用及其在不同年代二者作用关系的变化。结果表明：热带印度洋偶板子指数超前热带太平洋Nin03指数2月时相关最大，印度洋单板子指数滞后Nin03指数3～4月时相关最大。印度洋偶板子在一定程度上影响E1 Nino事件的发生，而E1 Nino事件的发生、发展会影响印度洋单板子事件的发生。热带印度洋偶板子事件与热带太平洋ENSO事件的相互作用在1961年发生了明显跃变，其原因可能是1961年之前热带印度洋偶板子对热带太平洋上空的纬向风影响很小，而1961年以后其影响明显加强。热带印度洋单板子事件与热带太平洋ENSO事件的相关一直显著，没有明显跃变。

Interdecadal Variation of Interactions between Tropical Pacific and Indian Ocean

Interaction along with its interdecadal variation between tropical Pacific and Indian Ocean have been studied on the basis of the monthly NCEP/NCAR Reanalysis dataset, and GISST data. The results are summarized as follows ： when Dipole indices lead Nino3 indices by 2 months, their correlation is the best, and when Unipole indices lag Nino3 indices by 3-4 months, their correlation is also the best. Indian Ocean Dipole is able to influence occurrence of E1 Nino to some degree, but the occurrence and development of E1 Nino can influence occurrence of Indian Ocean Unipole. There was an obvious jump in interaction between Dipole and ENSO events in 1961, the possible cause is likely that the impact of the Dipole on zonal winds over the tropical Pacific was weak before 1961 ,however enhanced after 1961. But the correlation of Unipole and ENSO events was always distinct, and their interaction has not obviously changed.