Impact of Tropospheric Ozone on Summer Climate in China
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The spatial distribution, radiative forcing, and climatic effects of tropospheric ozone in China during summer were investigated by using the regional climate model RegCM4. The results revealed that the tropospheric ozone column concentration was high in East China, Central China, North China, and the Sichuan basin during summer. The increase in tropospheric ozone levels since the industrialization era produced clear-sky shortwave and clear-sky longwave radiative forcing of 0.18 and 0.71 W m–2, respectively, which increased the average surface air temperature by 0.06 K and the average precipitation by 0.22 mm day–1 over eastern China during summer. In addition, tropospheric ozone increased the land–sea thermal contrast, leading to an enhancement of East Asian summer monsoon circulation over southern China and a weakening over northern China. The notable increase in surface air temperature in northwestern China, East China, and North China could be attributed to the absorption of longwave radiation by ozone, negative cloud amount anomaly, and corresponding positive shortwave radiation anomaly. There was a substantial increase in precipitation in the middle and lower reaches of the Yangtze River. It was related to the enhanced upward motion and the increased water vapor brought by strengthened southerly winds in the lower troposphere.
Key wordstropospheric ozone China East Asian summer monsoon radiative forcing climatic effects
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- IPCC, 2013: Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, T. F. Stocker, D. Qin, G. K. Plattner, et al., Eds., Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 1535 pp.Google Scholar
- Shindell, D., G. Faluvegi, A. Lacis, et al., 2006: Role of tropospheric ozone increases in 20th-century climate change. J. Geophys. Res. Atmos., 111, D08302, doi: 10.1029/2005JD006348.Google Scholar
- Wang, T. J., M. Xie, L. J. Gao, et al., 2004: Development and preliminary application of a coupled regional climate–chemistry model system. J. Nanjing Univ. (Nat. Sci.), 40, 711–727, doi: 10.3321/j.issn:0469-5097.2004.06.007. (in Chinese)Google Scholar
- Wang, W. G., J. Wu, H. N. Liu, et al., 2005: Researches on the influence of pollution emission on tropospheric ozone variation and radiation over China and its adjacent area. Chinese J. Atmos. Sci., 29, 734–746, doi: 10.3878/j.issn.1006-9895.2005.05.07. (in Chinese)Google Scholar
- Wu, J., W. M. Jiang, H. N. Liu, et al., 2003: The influence of increasing ozone in troposphere on air temperature in China. Plateau Meteor., 22, 132–142, doi: 10.3321/j.issn:1000-0534.2003.02.006. (in Chinese)Google Scholar
- Ziemke, J. R., S. Chandra, B. N. Duncan, et al., 2006: Tropospheric ozone determined from Aura OMI and MLS: Evaluation of measurements and comparison with the Global Modeling Initiative’s Chemical Transport Model. J. Geophys. Res. Atmos., 111, D19303, doi: 10.1029/2006JD007089.CrossRefGoogle Scholar