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Comparison of East Asian winter monsoon indices

机译：东亚冬季风指数比较

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Four East Asian winter monsoon (EAWM) indices arecompared in this paper. In the research periods, all the indices showsimilar interannual and decadal-interdecadal variations, with predominantperiods centering in 3–4 years, 6.5 years and 9–15 years, respectively.Besides, all the indices show remarkable weakening trends since the 1980s.The correlation coefficient of each two indices is positive with asignificance level of 99%.Both the correlation analyses and the composites indicate that in strongerEAWM years, the Siberian high and the higher-level subtropical westerly jetare stronger, and the Aleutian low and the East Asia trough are deeper. Thiscirculation pattern is favorable for much stronger northwesterly wind andlower air temperature in the subtropical regions of East Asia, while it ison the opposite in weaker EAWM years. Besides, EAWM can also exert aremarkable leading effect on the summer monsoon. After stronger (weaker)EAWM, less (more) summer precipitation is seen over the regions from theYangtze River valley of China to southern Japan, while more (less) fromSouth China Sea to the tropical western Pacific.
机译：本文比较了四个东亚冬季风（EAWM）指数。在研究期间，所有指数均显示相似的年际和年代际变化，主要时期分别集中在3-4年，6.5年和9-15年。此外，所有指数均显示出自1980年代以来的显着减弱趋势。两个指数的系数均为正，显着性水平为99％。相关分析和综合分析均表明，EAWM年越强，西伯利亚高压和副热带西风急流越强，阿留申低压低。和东亚低谷更深。这种环流模式有利于东亚副热带地区的西北风更大，气温更低，而在EAWM较弱的年份则相反。此外，EAWM还可以在夏季风中发挥显着的主导作用。经过更强（更弱）的EAWM，从中国长江流域到日本南部地区，夏季降水减少（更多），而从南海到热带西太平洋地区的降水减少（更多）。

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