El Nino has an adverse effect on China's megacities

El Nino has an adverse effect on China's megacities ...

China has implemented a variety of emission reduction strategies, including the Clean Air Action and the Blue Sky Protection Campaign. According to an EHC, PM2.5 pollution is still observed in China under unfavourable weather conditions. El NinoSouthern Oscillation (ENSO) is the strongest signal that allows the interannual variations in the oceanatmosphere system near the equator. It oscillates between its warm period (El Nino) and cold period (La Nina) and can significantly influence aerosol concentrations.

During ENSO meetings in China from 2014 to 2021, a team led by Prof. Yang Yang from the Nanjing University of Information Science and Technology studied the variability of wintertime PM2.5 concentrations.

The global effects of wind and precipitation anomalies on PM2.5 are unpredictable in El Nino''s region, causing the BeijingTianjinHebei and Fenwei Plain areas to fall in wintertime PM2.5 concentrations compared to the La Nina years. In the Pearl River Delta region, PM2.5 concentrations are higher than those observed in La Nina years. In the Yangtze River Delta, the anomalous winds of ENSO have caused the effects of moisture fluctuations on PM2.5.

According to Prof. Yang, the ENSO''s PM2.5 modulation may be higher than the year-by-year emission changes.

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