El niño winter effects
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El Niño Winter Effects: Regional Temperature and Precipitation Impacts
US Winter Temperatures and Precipitation Patterns
El Niño events have significant effects on US winter weather, but the impacts depend on the type of El Niño. The traditional Eastern-Pacific El Niño tends to warm winters in the Great Lakes, Northeast, and Southwest US, while the Central-Pacific El Niño has a stronger influence on the Northwest and Southeast US. In recent decades, the Central-Pacific type has become more common, making the Northwest and Southeast more affected by El Niño winters . Central-Pacific El Niño events also enhance drying, especially in the Ohio–Mississippi Valley, Pacific Northwest, and Southeast, and weaken the wetting effect usually seen with Eastern-Pacific events. This shift may contribute to more frequent droughts in the US .
In California, El Niño’s impact on winter precipitation is stronger in the south than in the north, and the effect grows from early to late winter. Moderate-to-strong El Niño events often bring wetter conditions to southern California, but do not necessarily make northern California drier .
Southeastern US: Synergistic Effects and Precipitation
Winter precipitation in the southeastern US increases significantly when El Niño coincides with the negative phase of the North Atlantic Oscillation. This combination enhances atmospheric patterns that bring more moisture and storm activity to the region, leading to wetter winters .
East Asia and China: Precipitation and Aerosol Changes
El Niño intensifies winter precipitation extremes in southeastern China by increasing the frequency of heavy rainfall events. This is mainly due to a weaker East Asian winter monsoon and changes in atmospheric circulation that bring more moisture to the region. The Eastern-Pacific El Niño increases extreme precipitation in South China, while the Central-Pacific type mainly affects East China .
El Niño also affects winter air quality in China. Central-Pacific El Niño events lead to higher aerosol concentrations in southern China compared to Eastern-Pacific events. Moderate El Niño events, regardless of type, increase surface aerosol concentrations across eastern China, while strong and weak events can decrease them in the north. Most El Niño events increase the number of severe winter haze days in northern China, with some types also affecting the south .
North Pacific and Stratospheric Effects
Eastern-Pacific El Niño episodes strengthen and shift the North Pacific winter storm track toward the equator, increasing storm activity in the region. This is linked to changes in atmospheric energy and temperature patterns . Super El Niño events (like those in 1982/83, 1997/98, and 2015/16) also cause large anomalies in the northern winter stratosphere, including warmer polar cap temperatures and weaker polar vortex conditions .
Indian Ocean and Global Teleconnections
El Niño, especially when combined with a positive Arctic Oscillation, creates a dipole pattern in winter heat flux over the tropical Indian Ocean. This results in oceanic heat gain in the southeast and heat loss in the west, mainly due to changes in wind, cloud cover, and sea surface temperatures .
Conclusion
El Niño’s winter effects are complex and vary by region, event type, and interactions with other climate patterns. In the US, El Niño can bring warmer or drier winters depending on its type and location, with the Central-Pacific variety now playing a larger role. In East Asia, El Niño increases extreme winter precipitation and affects air quality. These impacts are shaped by shifts in atmospheric circulation, storm tracks, and global teleconnections, highlighting the importance of understanding El Niño diversity for predicting winter weather extremes worldwide Yu2012Gao2019Jong2016+6 MORE.
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