globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2013JD020235
论文题名:
Methyl chloride from the Aura Microwave Limb Sounder: First global climatology and assessment of variability in the upper troposphere and stratosphere
作者: Santee M.L.; Livesey N.J.; Manney G.L.; Lambert A.; Read W.G.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期:24
起始页码: 13532
结束页码: 13560
语种: 英语
英文关键词: biomass burning ; climatology ; data validation ; methyl chloride (CH3Cl) ; satellite measurements ; transport
Scopus关键词: Acoustic devices ; Atmospherics ; Biomass ; Carbon monoxide ; Climatology ; NASA ; Ozone layer ; Troposphere ; Biomass-burning ; Data validation ; Methyl chlorides ; Satellite measurements ; transport ; Chlorine compounds ; anthropogenic source ; assessment method ; atmospheric chemistry ; atmospheric pollution ; atmospheric transport ; biomass burning ; carbon monoxide ; chlorine ; climatology ; convection ; data set ; halogen ; methyl chloride ; ozone ; satellite imagery ; stratosphere ; temporal variation ; tropopause ; troposphere
英文摘要: Methyl chloride (CH3Cl) is by far the largest natural carrier of chlorine to the stratosphere. Its importance in stratospheric ozone chemistry is expected to increase in the coming decades as emission controls alter the relative contributions from natural and anthropogenic halogen sources. The Microwave Limb Sounder (MLS) on NASA's Aura satellite provides the first daily global observations of CH3Cl. Here we quantify the quality of the MLS version 3 CH3Cl data (single-profile precision of ±100 pptv; accuracy of 30-45%; vertical and horizontal resolution of 4-5 km and 450-600 km, respectively) and demonstrate their utility for scientific studies over the vertical range from 147 to 4.6 hPa. We exploit the unmatched scope of the 8 year MLS data set to investigate the spatial, seasonal, and interannual variations in the distribution of CH3Cl in the upper troposphere/lower stratosphere (UTLS). Like carbon monoxide, CH3Cl is a marker of pollution from biomass burning that can be lofted to the UTLS very rapidly by deep convection. The climatological seasonal cycle in CH3Cl reflects variability in regional fire activity and other surface sources as well as convection, and anomalous CH3Cl enhancements in the tropical upper troposphere are linked to specific episodes of intense burning. Methyl chloride is shown to be very useful as a tracer of large-scale dynamical processes, such as diabatic descent inside the stratospheric winter polar vortices, quasi-isentropic cross-tropopause transport associated with the summer monsoon circulations, and effects related to the quasi-biennial oscillation and the tropical "tape recorder". Key Points Aura MLS provides the first daily global observations of methyl chloride (CH3Cl) Variability/climatology of UTLS/stratospheric CH3Cl studied in 8-yr record CH3Cl is a useful tracer of biomass burning and large-scale transport processes ©2013. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63073
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: Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 233-200, 4800 Oak Grove Drive, Pasadena, CA 91109, United States; NorthWest Research Associates, Socorro NM, United States; Department of Physics, New Mexico Institute of Mining and Technology, Socorro NM, United States

Recommended Citation:
Santee M.L.,Livesey N.J.,Manney G.L.,et al. Methyl chloride from the Aura Microwave Limb Sounder: First global climatology and assessment of variability in the upper troposphere and stratosphere[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(24)
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