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Atmosphere 2018, 9(10), 366; https://doi.org/10.3390/atmos9100366

Impacts of Different Onset Time El Niño Events on Winter Precipitation over South China

1
South China Sea Institute of Marine Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
2
National Centre for Groundwater Research and Training, Flinders University, Bedford Park, South Australia 5042, Australia
*
Author to whom correspondence should be addressed.
Received: 5 August 2018 / Revised: 1 September 2018 / Accepted: 7 September 2018 / Published: 20 September 2018
(This article belongs to the Section Climatology and Meteorology)
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Abstract

Winter precipitation over South China tended to be much higher than normal for the spring El Niño events during 1979–2016. For the spring El Niño events, the meridional and zonal circulations served as a bridge, linking the warmer sea surface temperature (SST) in the eastern equatorial Pacific (EEP) and South China winter precipitation. This possible physical process can be described as follows: During boreal winter, a positive SST anomaly in the EEP was concurrent with strong anomalous convection activity over South China via anomalous Walker circulation, an anomalous Hadley Cell along 110°–130° E, and a zonal westward teleconnection wave train pattern at 700 hPa in the Northern Hemisphere. In addition, an anomalous pumping effect at 200 hPa contributed to the convective activity. Meanwhile, the western Pacific subtropical high moved southwards and strengthened at 500 hPa, and abnormal southwesterly winds brought plentiful water vapor to South China at 850 hPa. All these factors favored an increase in precipitation over South China. For the summer El Niño events, the aforementioned anomalies were weaker, which resulted in a precipitation close to normal over South China. View Full-Text
Keywords: spring El Niño; summer El Niño; South China; winter precipitation spring El Niño; summer El Niño; South China; winter precipitation
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Fan, L.; Xu, J.; Guan, H. Impacts of Different Onset Time El Niño Events on Winter Precipitation over South China. Atmosphere 2018, 9, 366.

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