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Original Research Papers

Effect of emission changes in Southeast Asia on global hydroxyl and methane lifetime

Authors:

S. B. Dalsøren ,

Department of Geosciences, University of Oslo; CICERO, Centre for International Climate and Environmental Research, NO
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I. S. A. Isaksen,

Department of Geosciences, University of Oslo; CICERO, Centre for International Climate and Environmental Research, NO
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L. Li,

Department of Geosciences, University of Oslo; NILU, Norwegian Institute for Air Research, NO
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A. Richter

Institute of Environmental Physics, University of Bremen, DE
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Abstract

We performed model studies on how anthropogenic emission changes in Southeast Asia (region between 60–150◦E and 10◦S–50◦N) in the period 1980–2020 could contribute to changes in hydroxyl and methane lifetime on a global scale. From 1980 to 2000, we calculate small global OH and methane lifetime changes due to compensating effects by emission changes in Southeast Asia and emission changes in the rest of the world. There is no guarantee that this offset will persist in the future. Southeast Asia is going through rapid economic development and emission increases there may be a major driver for changes. The development of Asian emissions after year 2000 is under much debate and for this period we apply several emission scenarios. For most emission scenarios the simulated Southeast Asian induced changes in global hydroxyl and methane lifetime after year 2000 are moderate. However, an upper estimate assuming very high increases in NOx emissions results in substantial increases of hydroxyl and corresponding reductions in global methane lifetime. Interestingly, for the high NOx emission case our results fit very well with recent satellite observations on trends of NO2 over central eastern China.

How to Cite: Dalsøren, S.B., Isaksen, I.S.A., Li, L. and Richter, A., 2009. Effect of emission changes in Southeast Asia on global hydroxyl and methane lifetime. Tellus B: Chemical and Physical Meteorology, 61(4), pp.588–601. DOI: http://doi.org/10.1111/j.1600-0889.2009.00429.x
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  Published on 01 Jan 2009
 Accepted on 18 May 2009            Submitted on 20 Jul 2008

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