DOI: 10.1002/jgrd.50857
论文题名: Interannual variability in tropical tropospheric ozone and OH: The role of lightning
作者: Murray L.T. ; Logan J.A. ; Jacob D.J.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 11468
结束页码: 11480
语种: 英语
英文关键词: interannual variability
; lightning
; OH
; ozone
Scopus关键词: Feedback
; Nitrogen oxides
; Ozone
; Ozone layer
; Polyols
; Tropics
; Troposphere
; Waste incineration
; Chemical transport models
; Environmental factors
; Interannual variability
; Lightning imaging sensors
; Nitrogen oxide radicals
; OH
; Satellite observations
; Tropospheric oxidants
; Lightning
; annual variation
; biomass burning
; environmental factor
; EOS
; hydroxyl radical
; lightning
; nitrogen oxides
; oxidant
; ozone
; sensor
; troposphere
英文摘要: Nitrogen oxide radicals (NOx ) produced by lightning are natural precursors for the production of the dominant tropospheric oxidants, OH and ozone. Observations of the interannual variability (IAV) of tropical ozone and of global mean OH (from the methyl chloroform proxy) offer a window for understanding the sensitivity of ozone and OH to environmental factors. We present the results of simulations for 1998-2006 using the GEOS-Chem chemical transport model (CTM) with IAV in tropical lightning constrained by satellite observations from the Lightning Imaging Sensor. We find that this imposed IAV in lightning NOx improves the ability of the model to reproduce observed IAV in tropical ozone and OH. Lightning is far more important than biomass burning in driving the IAV of tropical ozone, even though the IAV of NOx emissions from fires is greater than that from lightning. Our results indicate that the IAV in tropospheric OH is highly sensitive to lightning relative to other emissions and suggest that lightning contributes an important fraction of the observed IAV in OH inferred from the methyl chloroform proxy. Lightning affects OH through the HO2 + NO reaction, an effect compounded by positive feedback from the resulting increase in ozone production and in CO loss. We can account in the model for the observed increase in OH in 1998-2004 and for its IAV, but the model fails to explain the OH decrease in 2004-2006. We find that stratospheric ozone plays little role in driving IAV in OH during 1998-2006, in contrast to previous studies that examined earlier periods. Key Points Imposing IAV in lightning from satellite improves hindcasts of ozone and OH IAV in tropical ozone and OH more sensitive to lightning than other emissions OH particularly sensitive to lightning because of positive chemical feedbacks ©2013. American Geophysical Union. All Rights Reserved. 资助项目: NNX08AJ16G
; NNX10AG59G
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63255
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: School of Engineering and Applied Sciences, Harvard University, Pierce Hall, 29 Oxford St, Cambridge, MA 02138, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades NY, United States
Recommended Citation:
Murray L.T.,Logan J.A.,Jacob D.J.. Interannual variability in tropical tropospheric ozone and OH: The role of lightning[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)