两类ENSO事件前期的热带太平洋海温距平场

ANALYSIS OF THE OCEANIC FEATURE IN THE TROPICAL PACIFIC OCEAN ONE YEAR BEFORE ONSET OF THE TWO TYPES ENSO EVENT

关键词:  ENSO事件前期  热带太平洋  海温距平场

Key words:  ENSO events  Tropical Pacific  SST deviation

摘要:

分析了1956年以来两类ENSO事件热带太平洋海温距平场的特征,结果指出,东部型E1 Nino事件前期为La Nina事件年,热带中东太平洋为强的海温负距平,东部型La Nina事件前期为El Nino事件年,热带中东太平洋为强的海温正距平;中部型El Nino事件前期热带中西太平洋多为明显的海温正距平,中部型La Nina事件前期热带东太平洋多为明显的海温负距平。两类ENSO事件前期海温距平场特征基本相反。就热带西太平洋暖池海域而言,中部型El Nino事件前期暖池处于偏暖状态,东部型El Nino事件

Abstract:

The oceanic feature in the tropical Pacific Ocean one year before the two types of ENSO event was analyzed. The results show that, one year before the eastern pattern El Nino events onset, the La Nina events occured, in which the SST was extremely colder than normal in eastern and central tropical Pacific Ocean; one year before the eastern pattern La Nina events onset,the El Nino events occured, when the SST was extremaly warmer than normal in eastern and central tropical Pacific Ocean. There were much warmer SST in the tropical western and central Pacific Ocean before the Central pattern El Nino events onset, and much colder SST in the tropical eastern Pacific Ocean before the central pattern La Nina events onset. Warmer SST in the tropical weatern Pacific warm pool region is an essential condition for the onset of central pattern of El Nino events.