违反了 PRIMARY KEY 约束 'PK_t_counter'。不能在对象 'dbo.t_counter' 中插入重复键。 语句已终止。 El Niño发展年和La Niña年东亚夏季风季节内变化的比较-Comparison of Intraseasonal Variation of the East Asian Summer Monsoon between El Niño Developing Years and La Niña Years
doi:  10.3878/j.issn.1006-9585.2017.17044
El Niño发展年和La Niña年东亚夏季风季节内变化的比较

Comparison of Intraseasonal Variation of the East Asian Summer Monsoon between El Niño Developing Years and La Niña Years
摘要点击 359  全文点击 545  投稿时间:2017-03-17  
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基金:  国家自然科学基金项目41475052、41405056
中文关键词:  东亚夏季风  西太平洋副热带高压  季节内变化  El Niño发展年  La Niña年
英文关键词:  East Asian summer monsoon  Western Pacific subtropical high  Intraseasonal variation  El Niño developing year  La Niña year
        
作者中文名作者英文名单位
薛峰XUE Feng中国科学院大气物理研究所国际气候与环境科学中心, 北京 100029
段欣妤DUAN Xinyu中国科学院大气物理研究所国际气候与环境科学中心, 北京 100029;中国科学院大学, 北京 100049
苏同华SU Tonghua福建省气象台, 福州 3500011 中国科学院大气物理研究所国际气候与环境科学中心, 北京 100029
引用:薛峰,段欣妤,苏同华.2018.El Niño发展年和La Niña年东亚夏季风季节内变化的比较[J].气候与环境研究,23(3):321-331,doi:10.3878/j.issn.1006-9585.2017.17044.
Citation:XUE Feng,DUAN Xinyu,SU Tonghua.2018.Comparison of Intraseasonal Variation of the East Asian Summer Monsoon between El Niño Developing Years and La Niña Years[J].Climatic and Environmental Research(in Chinese),23(3):321-331,doi:10.3878/j.issn.1006-9585.2017.17044.
中文摘要:
      基于1979~2013年多种再分析资料,合成分析了El Niño发展年和La Niña年东亚夏季风的季节内变化。结果表明,东亚夏季风在两种情况下呈现出不同的季节内变化特征。在El Niño发展年,初夏期间高纬度地区出现偏北风异常,造成东亚地区位势高度场偏低,西太平洋副热带高压偏东,但均不显著。盛夏期间,El Niño强迫造成中太平洋对流增强,副热带西太平洋出现气旋异常,位势高度显著降低,副热带高压明显偏东。与此不同的是,La Niña年春季暖池海温偏高,造成夏季对流偏强,西太平洋地区位势高度场偏低,副热带高压减弱东退。此外,La Niña年东亚夏季风的季节内变化较为复杂,6月异常较弱,7月达到最强,8月又开始减弱。因此,虽然El Niño发展年和La Niña年夏季平均副高异常有一定的相似性,但季节内变化则有很大差异,其成因也完全不同。
Abstract:
      Based on various reanalysis datasets during 1979-2013, we compare the intraseasonal variation of the East Asian summer monsoon (EASM) between El Niño developing years and La Niña years. It is shown that the EASM exhibits different features in the intraseasonal variation under the two situations. During the early summer of El Niño developing years, there exist weak northerly anomalies in the high latitudes, which induce negative geopotential height anomalies over East Asian and a slightly eastward retreat of the western Pacific subtropical high (WPSH). During the late summer, a cyclonic anomaly is induced in the subtropical western Pacific with enhanced convection in the central Pacific due to El Niño forcing. As a result, geopotential height reduces significantly and the WPSH tends to retreat eastward remarkably. In La Niña years, however, the warm pool convection in the summer clearly enhances due to warmer sea surface temperature in the western Pacific in the spring. Accordingly, geopotential height reduces and the WPSH tends to retreat eastward. Besides, the intraseasonal variation of the East Asian summer monsoon exhibits complicated characters in La Niña years with the strongest anomaly occurring in July and relatively weak anomaly occurring in June and August. Although the summer mean WPSH in El Niño developing years is somewhat similar to that in La Niña years, there is a significant discrepancy in the intraseasonal variation. More importantly, the physical mechanisms for the intraseasonal variation are completely different.
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