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首页»科研成果» 2016
冯娟、李建平与合作者在Journal of the Meteorological Society of Japan上发表论文
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Contrasting impacts of developing phases of two types of El Niño on southern China rainfall Juan Feng1,2, Jianping Li1,2 Fei Zheng3, Fei Xie1,2, Cheng Sun1,2 1 College of Global Change and Earth System Science (GCESS), Beijing Normal University, Beijing 100875, China 2 Joint Center for Global Change Studies, Beijing 100875, China 3 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China Abstract The potential influence of the developing phases of two types of El Niño (i.e., EP El Niño and CP El Niño) on rainfall over southern China were investigated using observational datasets from 1979 to 2008. The developing phases of the CP El Niño events are associated with enhanced rainfall over southern China during summer, whereas the influence is not significant in autumn. During the developing phases of the EP El Niño events, rainfall increases significantly over southern China during autumn, but no significant increases are observed in summer. These increases in rainfall are a result of the circulation anomalies associated with the two types of El Niño events. The western Pacific subtropical high (WPSH) shifts northeastward during developing phases of CP El Niño events in summer, and is accompanied by enhanced convection and ascending flow. The WPSH shifts westward during the developing phases of the EP El Niño events in autumn, and is associated with anomalous southwesterlies over southern China. These circulation anomalies favor more rainfall in the southern China. No significant circulation anomalies occur during the developing phases of the CP El Niño events in autumn or the EP El Niño events in summer. These results highlight the importance of considering their developing phases when investigating the effects of these two types of El Niño events on climate. Keywords: EP El Niño, CP El Niño, rainfall, southern China Published By : Journal of the Meteorological Society of Japan, online, DOI:10.2151/jmsj. 2016-019 Source: http://jmsj.metsoc.jp/EOR/2016-019.pdf |
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