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东亚夏季降水和高空急流关系的未来变化预估

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Keywords: 东亚夏季降水,东亚高空急流,年际变率,相关关系,预估

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Abstract:

利用CMIP5(CoupledModelIntercomparisonProjectphase5)中的17个模式,基于历史试验、RCP4.5以及RCP8.5排放情景下的模拟结果,分析了东亚夏季降水及东亚高空急流的时空分布特征.分析结果发现模式结果能较好模拟出东亚和西北太平洋地区降水和高空纬向风较强的年际变率,以及东亚雨带降水异常和东亚高空急流南北偏移之间的相关关系.此外,预估结果表明在RCP4.5和RCP8.5两种排放情景下,21世纪东亚雨带降水以及高空急流的年际变率增强,这与以往的研究结果吻合.同时也发现,虽然模式之间尚存在较明显的差异,但是总体来说,在全球变暖背景下,东亚夏季雨带降水异常和东亚高空急流南北偏移之间的关系将变得更加密切.

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