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Impact of the 2015 El Nino event on winter air quality in China

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ABSTRACT

During the winter of 2015, there was a strong El Nino (ENSO) event, resulting in significant anomalies for meteorological conditions in China. Analysis shows that the meteorological conditions in December 2015 (compared to December 2014) had several important anomalies, including the following: (1) the surface southeasterly winds were significantly enhanced in the North China Plain (NCP); (2) the precipitation was increased in the south of eastern China; and (3) the wind speeds were decreased in the middle-north of eastern China, while slightly increased in the south of eastern China. These meteorological anomalies produced important impacts on the aerosol pollution in eastern China. In the NCP region, the PM2.5 concentrations were significantly increased, with a maximum increase of 80–100 μg m−3. A global chemical/transport model (MOZART-4) was applied to study the individual contribution of the changes in winds and precipitation to PM2.5 concentrations. This study suggests that the 2015El Nino event had significant effects on air pollution in eastern China, especially in the NCP region, including the capital city of Beijing, in which aerosol pollution was significantly enhanced in the already heavily polluted capital city of China.

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Monthly mean anomalies between Dec. 2015 and Dec. 2014 of surface wind speed (m s−1) in eastern China.Rainy days were excluded. The wind speeds were measured by the National Climate Center of China at 2,540 monitoring sites. The map was generated by The NCAR Command Language (Version 6.3.0) [Software]. (2016). Boulder, Colorado: UCAR/NCAR/CISL/TDD. http://dx.doi.org/10.5065/D6WD3XH5.
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f3: Monthly mean anomalies between Dec. 2015 and Dec. 2014 of surface wind speed (m s−1) in eastern China.Rainy days were excluded. The wind speeds were measured by the National Climate Center of China at 2,540 monitoring sites. The map was generated by The NCAR Command Language (Version 6.3.0) [Software]. (2016). Boulder, Colorado: UCAR/NCAR/CISL/TDD. http://dx.doi.org/10.5065/D6WD3XH5.

Mentions: Another important factor is wind speed, which has an important effect on the PM2.5 concentrations31112. Figure 3 shows the anomalies of monthly mean surface wind speeds (m s−1) during the 2015-ENSO. It shows that the surface wind speeds were generally reduced in eastern China, especially in the NCP region (north of the Yellow River), with a decrease in surface wind speeds of 0.5–1.0 m s−1. In the middle of eastern China (between the Yellow and the Yangtze Rivers), the surface wind speeds were generally decreased, with a maximum reduction of 0.5 m s−1. In the south of eastern China (south of the Yangtze River), the changes in surface wind speeds were mixed. In most areas, the surface wind speeds were slightly increased, with a maximum increase of 0.8 m s−1. However, there was a small area where the dominant changes were the decreases in wind speeds. The overall changes in the surface wind speeds in this region ranged between −0.6 and +0.8 m s−1.


Impact of the 2015 El Nino event on winter air quality in China
Monthly mean anomalies between Dec. 2015 and Dec. 2014 of surface wind speed (m s−1) in eastern China.Rainy days were excluded. The wind speeds were measured by the National Climate Center of China at 2,540 monitoring sites. The map was generated by The NCAR Command Language (Version 6.3.0) [Software]. (2016). Boulder, Colorado: UCAR/NCAR/CISL/TDD. http://dx.doi.org/10.5065/D6WD3XH5.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5037463&req=5

f3: Monthly mean anomalies between Dec. 2015 and Dec. 2014 of surface wind speed (m s−1) in eastern China.Rainy days were excluded. The wind speeds were measured by the National Climate Center of China at 2,540 monitoring sites. The map was generated by The NCAR Command Language (Version 6.3.0) [Software]. (2016). Boulder, Colorado: UCAR/NCAR/CISL/TDD. http://dx.doi.org/10.5065/D6WD3XH5.
Mentions: Another important factor is wind speed, which has an important effect on the PM2.5 concentrations31112. Figure 3 shows the anomalies of monthly mean surface wind speeds (m s−1) during the 2015-ENSO. It shows that the surface wind speeds were generally reduced in eastern China, especially in the NCP region (north of the Yellow River), with a decrease in surface wind speeds of 0.5–1.0 m s−1. In the middle of eastern China (between the Yellow and the Yangtze Rivers), the surface wind speeds were generally decreased, with a maximum reduction of 0.5 m s−1. In the south of eastern China (south of the Yangtze River), the changes in surface wind speeds were mixed. In most areas, the surface wind speeds were slightly increased, with a maximum increase of 0.8 m s−1. However, there was a small area where the dominant changes were the decreases in wind speeds. The overall changes in the surface wind speeds in this region ranged between −0.6 and +0.8 m s−1.

View Article: PubMed Central - PubMed

ABSTRACT

During the winter of 2015, there was a strong El Nino (ENSO) event, resulting in significant anomalies for meteorological conditions in China. Analysis shows that the meteorological conditions in December 2015 (compared to December 2014) had several important anomalies, including the following: (1) the surface southeasterly winds were significantly enhanced in the North China Plain (NCP); (2) the precipitation was increased in the south of eastern China; and (3) the wind speeds were decreased in the middle-north of eastern China, while slightly increased in the south of eastern China. These meteorological anomalies produced important impacts on the aerosol pollution in eastern China. In the NCP region, the PM2.5 concentrations were significantly increased, with a maximum increase of 80–100 μg m−3. A global chemical/transport model (MOZART-4) was applied to study the individual contribution of the changes in winds and precipitation to PM2.5 concentrations. This study suggests that the 2015El Nino event had significant effects on air pollution in eastern China, especially in the NCP region, including the capital city of Beijing, in which aerosol pollution was significantly enhanced in the already heavily polluted capital city of China.

No MeSH data available.


Related in: MedlinePlus