• Title/Summary/Keyword: El $ni{\tilde{n}}o$-southern oscillation(ENSO)

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The Interdecadal Variation of Relationship between Indian Ocean Sea Surface Temperature and East Asian Summer Monsoon (인도양 해수면 온도와 동아시아 여름 몬순의 관계에 대한 장주기 변동성)

  • Kim, Won-Mo;Jhun, Jong-Ghap;Moon, Byung-Kwon
    • Journal of the Korean earth science society
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    • v.29 no.1
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    • pp.45-59
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    • 2008
  • This study aims to analyze the interdecadal variation of relationship between Indian Ocean sea surface temperature (SST) and East Asian summer monsoon (EASM) during the period of 1948-2005. In the pre-period, which is from 1948 to 1975, the relationship between Indian Ocean SST and East Asian summer rainfall anomaly (EASRA) is very weak. However, in the post-period, which is trom 1980 to 2005, Indian Ocean SST is significantly positively correlated with EASRA. The equatorial Indian Ocean SST has a significantly positive correlation with EASM in spring, while Indian Ocean SST near the bay of Bengal has a positive relationship in summer for the post-period. Also the interdecadal variation of the correlation between Indian Ocean SST and EASRA is significant, but that between EASRA and the El $Ni{\tilde{n}}o$-Southern Oscillation (ENSO) is not. Atmospheric general circulation model (AGCM) test results show the pattern of increased precipitation in the zonal belt region including South Korea and Japan and the pattern of decreased precipitation in the northeastern part of Asia, which are similar to the real climate. The increase of the precipitation in August from the model run is also similar to the real climate variation. Model results indicate that the Indian Ocean SST warming could intensify the convection over the vicinity of the Philippines and the Bay of Bengal, which forces to move northward the convection center. This warming strengthens the EASM and weakens the WNPM.