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Original Research Papers

The 30–60-day oscillation in the East Asian summer monsoon and its time-dependent association with the ENSO

Authors:

Kyung-Sook Yun,

Division of Earth Environmental System, College of Natural Science, Pusan National University, Busan, KR
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Baohua Ren,

School of Earth and Space Sciences, University of Science and Technology of China, Hefei, CN
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Kyung-Ja Ha ,

Division of Earth Environmental System, College of Natural Science, Pusan National University, Busan, KR
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Johnny C. L. Chan,

Guy Carpenter Asia-Pacific Climate Impact Centre, City University of Hong Kong, Hong Kong, CN
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Jong-Ghap Jhun

School of Earth and Environmental Sciences, Seoul National University, KR
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Abstract

Based on 30–60-day oscillation in the East Asian summer monsoon (EASM), the relationship between its northward propagation and ENSO (El Niño and Southern Oscillation) was investigated. To explicitly describe the 30–60-day monsoonal evolution, an empirical orthogonal function (EOF) analysis was carried out on the temporal-latitude section of the longitudinal average for 115°E–120°E. The principal 30–60-day EASM mode captures a northward propagation of well-organized intraseasonal oscillation (NISO). Using the associated time series of the first mode, we found a significant lagged correlation between interannual variability of the NISO and ENSO. Its lagged correlations with NINO indices have a quasi-biennial (QB) characteristic through the preceding summer and the concurrent summer. Their relationship was found by the regression analysis relating the low-level circulation to the ocean temperature. The western North Pacific anticyclone and the anticyclone-induced easterly vertical wind shear anomalies induce the dynamical linkage between the NISO and QB-type ENSO. It is shown that the NISO is more closely tied with QB-type ENSO in its phase than in its amplitude, and may be connected to the anomalous easterly wind and the eastward evolution of an oceanic Kelvin wave, which is associated with abrupt ENSO transition. The predictability on ENSO and NISO is examined through the canonical correlation analysis.

How to Cite: Yun, K.-S., Ren, B., Ha, K.-J., Chan, J.C.L. and Jhun, J.-G., 2009. The 30–60-day oscillation in the East Asian summer monsoon and its time-dependent association with the ENSO. Tellus A: Dynamic Meteorology and Oceanography, 61(5), pp.565–578. DOI: http://doi.org/10.1111/j.1600-0870.2009.00410.x
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  Published on 01 Jan 2009
 Accepted on 22 Jun 2009            Submitted on 16 Dec 2008

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