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大气科学  2014 

一种改进的华西秋雨指数及其气候特征

DOI: 10.3878/j.issn.1006-9895.2013.13120

Keywords: 秋雨指数,华西,对比分析,气候特征

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Abstract:

利用1960~2011年中国601站9~10月逐日降水量、日照时数资料,针对他人提出的华西秋雨指数,并结合华西秋雨的天气气候特征,改进建立了一种新的华西秋雨指数,并与他人提出的指数做了对比分析。结果表明:改进的华西秋雨指数能够相对更好的反映华西秋雨易发地区的地理分布及其强度变化,更准确地表征华西秋雨的年际、年代际变化特征;利用新指数发现华西秋雨的全区一致性特征明显,并呈现准6年周期的年际变化,其年代际变化特征明显,1960年代到1970年代初,1980年代到1990年代初偏强,1970年代中后期和1990年代后期偏弱,进入21世纪,呈现出由弱转强的趋势。

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