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Title: Substantial ozone enhancement over the North China Plain from increased biogenic emissions due to heat waves and land cover in summer 2017

Journal Article · · Atmospheric Chemistry and Physics (Online)
 [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [5];  [7]; ORCiD logo [8];  [1];  [1];  [2]; ORCiD logo [2]
  1. Ocean Univ. of China, Qingdao (China)
  2. Ocean Univ. of China, Qingdao (China); Qingdao National Lab. for Marine Science and Technology, Qingdao (China)
  3. Georgia Inst. of Technology, Atlanta, GA (United States)
  4. Qingdao National Lab. for Marine and Science Technology, Qingdao (China); Ocean Univ. of China, Qingdao (China); International Lab. for High-Resolution Earth System Prediction (iHESP), Qingdao (China)
  5. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  6. Chinese Academy of Sciences, Hefei (China); Univ. of Science and Technology of China, Hefei (China); Chinese Academy of Sciences, Xiamen (China); Anhui Province Key Lab. of Polar Environment and Global Change, Hefei (China)
  7. Tsinghua Univ., Beijing (China)
  8. Max Planck Inst. for Chemistry, Mainz (Germany)

In the summer of 2017, heavy ozone pollution swamped most of the North China Plain (NCP), with the maximum regional average of daily maximum 8 h ozone concentration (MDA8) reaching almost 120 ppbv. In light of the continuing reduction of anthropogenic emissions in China, the underlying mechanisms for the occurrences of these regional extreme ozone episodes are elucidated from two perspectives: meteorology and biogenic emissions. The significant positive correlation between MDA8 ozone and temperature, which is amplified during heat waves concomitant with stagnant air and no precipitation, supports the crucial role of meteorology in driving high ozone concentrations. We also find that biogenic emissions are enhanced due to factors previously not considered. During the heavy ozone pollution episodes in June 2017, biogenic emissions driven by high vapor pressure deficit (VPD), land cover change and urban landscape yield an extra mean MDA8 ozone of 3.08, 2.79 and 4.74 ppbv, respectively, over the NCP, which together contribute as much to MDA8 ozone as biogenic emissions simulated using the land cover of 2003 and ignoring VPD and urban landscape. In Beijing, the biogenic emission increase due to urban landscape has a comparable effect on MDA8 ozone to the combined effect of high VPD and land cover change between 2003 and 2016. In light of the large effect of urban landscape on biogenic emission and the subsequent ozone formation, the types of trees may be cautiously selected to take into account of the biogenic volatile organic compound (BVOC) emission during the afforestation of cities. This study highlights the vital contributions of heat waves, land cover change and urbanization to the occurrence of extreme ozone episodes, with significant implications for ozone pollution control in a future when heat wave frequency and intensity are projected to increase under global warming.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1577085
Report Number(s):
PNNL-SA-149765
Journal Information:
Atmospheric Chemistry and Physics (Online), Vol. 19, Issue 19; ISSN 1680-7324
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 62 works
Citation information provided by
Web of Science

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Seesaw haze pollution in North China modulated by the sub-seasonal variability of atmospheric circulation journal January 2019

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