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 Nino发展年和La Nina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 Ni?o Developing Summer and La Ni?a Summer
doi:  10.3878/j.issn.1006-9585.2017.17044
El Nino发展年和La Nina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 Ni?o Developing Summer and La Ni?a Summer
摘要点击 37  全文点击 14  投稿时间:2017-03-18  修订日期:2017-05-02
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基金:  
中文关键词:  东亚夏季风,西太平洋副高, 季节内变化,El Nino发展年,La Nina年
英文关键词:  East Asian summer monsoon, western Pacific subtropical high, intraseasonal vairiation, El Ni?o developing year, La Ni?a 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
段欣妤中国科学院大气物理研究所国际气候与环境科学中心
苏同华中国科学院大学;福建省气象台;福建省气象台
引用:薛峰,段欣妤,苏同华.2018.El Nino发展年和La Nina年东亚夏季风季节内变化的比较[J].气候与环境研究
Citation:Xue Feng.2018.Comparison of Intraseasonal Variation of the East Asian Summer Monsoon between El Ni?o Developing Summer and La Ni?a Summer[J].Climatic and Environmental Research(in Chinese)
中文摘要:
      基于1979~2013年多种再分析资料,合成分析了El Ni?o发展年和La Ni?a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 Ni?o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,西太平洋副高偏东,但均不显著。盛夏期间,El Ni?o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,副高明显偏东。与此不同的是,La Ni?a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,副高减弱东退。此外,La Ni?a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 Ni?o发展年和La Ni?a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 Ni?o developing years and La Ni?a years. It is shown that the EASM exhibits a different feature in the intraseasonal variation. During the early summer of El Ni?o developing years, there appears a weak northerly anomaly in high latitude, inducing a lower geopotential height anomaly 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 Ni?o forcing. As a result, geopotential height is reduced significantly and the WPSH tends to retreat eastward remarkably. In La Ni?a years, by contrast, the warm pool convection in summer is clearly enhanced due to a warmer sea surface temperature in the western Pacific in spring. Accordingly, geopotential height is reduced and the WPSH tends to retreat eastward. Besides, the intraseasonal variation in La Ni?a years exhibits a complex character, with a strongest anomaly in July and a relatively weaker anomaly in June and August. Although the summer mean WPSH in El Ni?o developing years is somewhat similar to that in La Ni?a years, there is a significant discrepancy in the intraseasonal variation. More importantly, the physical mechanisms for the intraseasonal variation are totally different.
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