El Niño signals contained in precipitation at the East China Sea

Climate Research

Jang-Won Seo¹  You-Soon Chang¹  DongChull Jeon¹  HuiSoo An¹  Jae-Cheol Nam¹ 

关键词: Precipitation;    El Niño;    Teleconnection;    Wavelet;    Correlation;    EOF;    Upper wind;   

DOI  :  10.3354/cr023031

来源: Inter-Research Science Publishing

【 摘 要 】

ABSTRACT: In general, El Niño signals can be easily identified in the tropical Pacific Ocean but not in the East China Sea, due to the complexity of the monsoon system and insufficient knowledge of El Niño effects in mid-latitudinal regions. In this studyinterannual variability of precipitation at the East China Sea is analyzed. Regional correlation and the spatial distribution of interannual variation of precipitation are also analyzed in order to confirm the teleconnection pattern. Most of the rainfallstations located in the southern area of Korea show significant biennial and interannual cycles with 2 to 8 yr periodicity. As for the wavelet analysis, it was found that the periods of significant maximum power spectrum corresponded with historical ElNiño episodes, especially when a strong El Niño/La Niña was repeated. Maximum positive correlation appears between the Niño3 region (equatorial eastern Pacific) and the East China Sea at a time lag of about 4 mo. This correlation tendency can be confirmedin the second mode of Empirical Orthogonal Function analysis explaining the strong El Niño event. These results also suggest variation in upper wind fields such as the Hadley circulation and East Asia jet stream.

【 授权许可】

Unknown