大气季节内振荡：其全球同步性及其与ENSO的关系

摘要

利用美国国家环境预报中心和大气研究中心的大气再分析资料，分析研究了大气季节内振荡的年际变化及其与ENSO的关系。揭示了全球不同纬度带之间存在着的大气季节内振荡年际变化的同步性，以及大气季节内振荡与海温和大气向外长波辐射之关系的复杂性。我们还发现大气季节内振荡与Nin03指数的关系存在年代际尺度的变化，即，这种关系有时强时弱的现象。%Based on the atmospheric reanalysis data from the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR), the interannual variability of the atmospheric intraseasonal oscillation (ISO) and its relationships with the El Nino/Southern Oscillation (ENSO) cycle have been investigated. This work reveals that there exists global coincidence in the interannual variation of ISO among different latitude bands and that relationships between the interannual variation of ISO and the global sea surface temperature (SST) or the outgoing longwave radiation (OLR)are very complicated. We also find that the correlation coefficient between ISO and Niiio3 SST anomaly has apparent decadal scale variability, which means that the inter-relationship is stronger in some periods and weaker in other periods.