DOI: 10.1002/2017JD027871
Scopus记录号: 2-s2.0-85042298215
论文题名: Decoupling the Effects of Transport and Chemical Loss on Tropospheric Composition: A Model Study of Path-Dependent Lifetimes
作者: Yang H. ; Waugh D.W. ; Holzer M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 4 起始页码: 2320
结束页码: 2335
语种: 英语
英文关键词: atmospheric composition and transport
; decoupling chemistry and transport
; oxidative capacity estimate
英文摘要: The distribution of most trace species within the troposphere depends on a complex interplay between chemistry and transport. Holzer and Waugh (2015) introduced the concept of a path-dependent lifetime τc(r), that parameterizes the integrated chemical loss during transport from the source to a given location r. Here we examine whether this parameterization provides a new approach for decoupling transport and chemistry. We present calculations of path-dependent lifetimes for a suite of chlorofluorocarbon replacement gases in a simple 12-box model and show that for trace species with global lifetimes from 0.5 years to 50 years τc provides an accurate representation of the integrated chemical loss during transport. The value of τc is shown to be sensitive to tropical hydroxyl radical (OH) concentrations, with much weaker sensitivity to extratropical OH or transport. Furthermore, fractional changes in Southern Hemisphere extratropical τc are similar to the corresponding fractional changes in tropical OH; that is, a 10% increase in tropical OH results in a 10% decrease in τc. This suggests that observation-based estimates of τc may be used to constrain tropical OH concentrations provided that τc can be determined with sufficient precision. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114451
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, MD, United States; Department of Applied Mathematics, School of Mathematics and Statistics, University of New South Wales, Sydney, NSW, Australia; Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, United States
Recommended Citation:
Yang H.,Waugh D.W.,Holzer M.. Decoupling the Effects of Transport and Chemical Loss on Tropospheric Composition: A Model Study of Path-Dependent Lifetimes[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(4)