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

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

Monthly mean anomalies of measured PM2.5 concentrations (μg m−3) between Dec. 2015 and Dec. 2014 in eastern China.The PM2.5 concentrations were measured by the Chinese National Environmental Monitoring Center (CNEMC) at 367 monitoring stations. 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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f4: Monthly mean anomalies of measured PM2.5 concentrations (μg m−3) between Dec. 2015 and Dec. 2014 in eastern China.The PM2.5 concentrations were measured by the Chinese National Environmental Monitoring Center (CNEMC) at 367 monitoring stations. 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: Figure 4 shows the anomalies of measured PM2.5 concentrations (μg m−3) during the 2015-ENSO. The results show that the PM2.5 anomalies existed in a complicated spatial distribution. The PM2.5 concentrations were significantly increased in the NCP region, with a maximum increase of 80–100 μg m−3. In this region, the southeasterly wind direction was enhanced, which was favorable for the increase in the PM2.5 concentrations (μg m−3). As explained in the supplementary information, the southeasterly wind had two important effects on the PM2.5 concentrations in the NCP region. First, the southeasterly wind enhanced the horizontal transport from high emission regions to the NCP region, resulting in an increase in PM2.5 concentrations. Second, there are mountains to the west and on the north sides of the NCP region. The pollution plumes transported from the southeastern region were ‘blocked’ by the mountains, leading to an accumulation of PM2.5 concentrations in the northwestern area of the NCP region. Another factor that increased the PM2.5 concentrations was the decrease in wind speed, which caused the accumulation of PM2.5 concentrations in the region.


Impact of the 2015 El Nino event on winter air quality in China
Monthly mean anomalies of measured PM2.5 concentrations (μg m−3) between Dec. 2015 and Dec. 2014 in eastern China.The PM2.5 concentrations were measured by the Chinese National Environmental Monitoring Center (CNEMC) at 367 monitoring stations. 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

f4: Monthly mean anomalies of measured PM2.5 concentrations (μg m−3) between Dec. 2015 and Dec. 2014 in eastern China.The PM2.5 concentrations were measured by the Chinese National Environmental Monitoring Center (CNEMC) at 367 monitoring stations. 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: Figure 4 shows the anomalies of measured PM2.5 concentrations (μg m−3) during the 2015-ENSO. The results show that the PM2.5 anomalies existed in a complicated spatial distribution. The PM2.5 concentrations were significantly increased in the NCP region, with a maximum increase of 80–100 μg m−3. In this region, the southeasterly wind direction was enhanced, which was favorable for the increase in the PM2.5 concentrations (μg m−3). As explained in the supplementary information, the southeasterly wind had two important effects on the PM2.5 concentrations in the NCP region. First, the southeasterly wind enhanced the horizontal transport from high emission regions to the NCP region, resulting in an increase in PM2.5 concentrations. Second, there are mountains to the west and on the north sides of the NCP region. The pollution plumes transported from the southeastern region were ‘blocked’ by the mountains, leading to an accumulation of PM2.5 concentrations in the northwestern area of the NCP region. Another factor that increased the PM2.5 concentrations was the decrease in wind speed, which caused the accumulation of PM2.5 concentrations in the region.

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