Abstract
The intraseasonal oscillation (ISO) is one of the major systems affecting the summer monsoon system in East Asia and the western North Pacific (EA/WNP). This has become known to the scientific community since the late 1970s and early 1980s. Studies (e.g., Murakami, 1976; Krishnamurti and Bhalme, 1976; Yasunari, 1979; Krishnamurti and Subrahmanyan, 1982) reported the prominent northward ISO propagation at both 10–20-day and 30–60-day periods in the Asian summer monsoon region. The passage of these intraseasonal fluctuations tended to be in phase with the onsets1 (i.e., beginning of wet phases) and breaks (i.e., beginning of dry phases) of the Indian summer monsoon. It was noted that northward movement also tended to occur simultaneously in EA/WNP (e.g., Yasunari, 1979). Other intraseasonal features in EA/WNP were also documented. For example, Murakami (1980) found 20–30-day perturbations propagating westward along 10°N-20°N and northward over the South China Sea.
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Hsu, HH. (2005). East Asian monsoon. In: Intraseasonal Variability in the Atmosphere-Ocean Climate System. Springer Praxis Books. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-27250-X_3
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