THE CHANGING EFFECT OF TWO TYPES OF ENSO IN THE SOUTH CHINA SEA

摘要

El Nino-Southern Oscillation (ENSO) events are one of the most principal impacts that affect the global climate, especially in the Tropical oceans. Previous studies have suggested the interannual variations on the conventional El Nino. However recent studies show the interannual variability connected with two type of El Nino, namely the Central-Pacific (CP) type of ENSO and Eastern-Pacific (EP) type of ENSO. During the CP type of ENSO, the maximum sea surface temperature anomalies are confined in the central equatorial Pacific, in contrast with the maximum sea surface temperature anomalies are found in the eastern equatorial Pacific during the EP type of ENSO. In order to focus on the influences on the ENSO events in the South China Sea (SCS) thermal variability, we should consider various influences of the CP and EP types of ENSO. In the study, air temperature, surface wind, precipitation, sea level press, sea surface temperature and multiple datasets has been used to analyze the interannual variations in the SCS. We estimate various thermal variability and indentify how well the two types of ENSO are influences on climate changes in the SCS. The composite for the EP ENSO events indicates a strong increase in the sea surface temperature anomaly over the SCS region. During the EP ENSO, the strength of the SST anomalies increases by as much as 0.5°C. However the decrease SST can be found in most part of the SCS during the CP ENSO. We also examine characteristics of atmosphere-ocean interaction between the SCS and western Pacific warm pool with the CP and EP types of ENSO.