NDLI: The asymmetric effects of El Niño and La Niña on the East Asian winter monsoon and their simulation by CMIP5 atmospheric models

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The asymmetric effects of El Niño and La Niña on the East Asian winter monsoon and their simulation by CMIP5 atmospheric models

Content Provider	Springer Nature Link
Author	Guo, Zhun Zhou, Tianjun Wu, Bo
Copyright Year	2017
Abstract	El Niño–Southern Oscillation (ENSO) events significantly affect the year-by-year variations of the East Asian winter monsoon (EAWM). However, the effect of La Niña events on the EAWM is not a mirror image of that of El Niño events. Although the EAWM becomes generally weaker during El Niño events and stronger during La Niña winters, the enhanced precipitation over the southeastern China and warmer surface air temperature along the East Asian coastline during El Niño years are more significant. These asymmetric effects are caused by the asymmetric longitudinal positions of the western North Pacific (WNP) anticyclone during El Niño events and the WNP cyclone during La Niña events; specifically, the center of the WNP cyclone during La Niña events is westward-shifted relative to its El Niño counterpart. This central-position shift results from the longitudinal shift of remote El Niño and La Niña anomalous heating, and asymmetry in the amplitude of local sea surface temperature anomalies over the WNP. However, such asymmetric effects of ENSO on the EAWM are barely reproduced by the atmospheric models of Phase 5 of the Coupled Model Intercomparison Project (CMIP5), although the spatial patterns of anomalous circulations are reasonably reproduced. The major limitation of the CMIP5 models is an overestimation of the anomalous WNP anticyclone/cyclone, which leads to stronger EAWM rainfall responses. The overestimated latent heat flux anomalies near the South China Sea and the northern WNP might be a key factor behind the overestimated anomalous circulations.
Starting Page	82
Ending Page	93
Page Count	12
File Format	PDF
ISSN	20956037
Journal	Journal of Meteorological Research
Volume Number	31
Issue Number	1
e-ISSN	21980934
Language	English
Publisher	The Chinese Meteorological Society
Publisher Date	2017-03-21
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	AMIP (Atmospheric Model Intercomparison Project) East Asian winter monsoon ENSO asymmetric effects cloud precipitation Atmospheric Sciences Meteorology Geophysics and Environmental Physics Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ocean Engineering Atmospheric Science

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