地球科学进展 ›› 2009, Vol. 24 ›› Issue (5): 488 -496. doi: 10.11867/j.issn.1001-8166.2009.05.0488

综述与评述 上一篇    下一篇

  1. 北京大学物理学院大气科学系,北京  100871
  • 收稿日期:2009-02-04 修回日期:2009-03-25 出版日期:2009-05-10
  • 通讯作者: 林云萍 E-mail:yplin@pku.edu.cn
  • 基金资助:


The Oxidation in the Troposphere: A Review

Lin Yunping, Zhao Chunsheng   

  1. Department of Atmospheric Sciences, School of Physics, Peking University, Beijing  100871, China
  • Received:2009-02-04 Revised:2009-03-25 Online:2009-05-10 Published:2009-05-10


       The tropospheric oxidation is an important indicator of the cleansing capacity of the atmosphere. Most trace gases emitted into the atmosphere are removed by oxidizing chemical reactions involving ozone and the hydroxyl free radical. The  research history of tropospheric OH including the fundamental reactions, measurement techniques and the long-term trend is reviewed in this paper. Due to the increased emissions of CO, NOx(=NO+NO2) and hydrocarbons by human activities, global mean OH concentrations have decreased since pre-industrial times, and the future trend of tropospheric OH still depends on the emissions of CO, NOx(=NO+NO2) and hydrocarbons. Using a 3-D global chemistry and transport model (MOZART), the distributions and trend of tropospheric OH over China and its neighborhood are studied. The results show that, consistent with variations in sunlight and water vapor, the concentrations of tropospheric OH over China increase gradually from winter to summer. In addition, by reason of the various emissions strength of OH precursors or sinks, such as ozone, CO and NOx, the highest concentrations of OH in July arise in North China and Pearl River Delta, while the lowest concentrations occur in those plateau areas in West China. Analysis of the impacts of various emissions of air pollutants on tropospheric OH in East China reveals a significant increase of tropospheric OH as a result of the pronounced increase of NOx emissions in China. Looking to the future, there is urgent need for more observations of tropospheric OH to improve and ultimately validate models and further understand the oxidation processes in our atmosphere.



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