DOI: 10.1038/ngeo1733
论文题名: Physical processes in the tropical tropopause layer and their roles in a changing climate
作者: Randel W.J. ; Jensen E.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 3 起始页码: 169
结束页码: 176
语种: 英语
Scopus关键词: aerosol
; air temperature
; chemical composition
; climate change
; ozone
; radiation balance
; stratosphere
; temperature effect
; tropical environment
; tropopause
; troposphere
; upper atmosphere
; upwelling
; water vapor
; Asia
英文摘要: Tropical climate and the composition of the global upper atmosphere are affected by the tropical tropopause layer - the atmospheric transition zone between the well-mixed, convective troposphere (up to altitudes of 12-14 km) and the highly stratified stratosphere (above about 18 km). Featuring chemical and dynamical properties that are midway between those of the troposphere and stratosphere, the tropopause layer is maintained by a complex interplay between large- and small-scale circulation patterns, deep convection, clouds and radiation. Tropospheric air enters the stratosphere primarily in the tropics. Ozone- and aerosol-related constituents of the global stratosphere, as well as water vapour content, are therefore largely determined by the composition of the air near the tropical tropopause. Over the past years, it has emerged that both slow ascent and rapid deep convection contribute to the composition and thermal structure of the tropical tropopause layer. Ice formation processes at low temperatures affect the efficacy of freeze drying as air passes through the cold tropopause region. Transport and mixing in the tropopause region has been found to be closely linked with the Asian monsoon and other tropical circulation systems. Given these connections, climate change is expected to influence the tropopause layer, for example through enhanced large-scale upwelling of air and potential changes in tropical convection, air temperature, chemical composition and cirrus. Copyright © 2013 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106846
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80307, United States; NASA Ames Research Center, Moffett Field, CA 94035, United States
Recommended Citation:
Randel W.J.,Jensen E.J.. Physical processes in the tropical tropopause layer and their roles in a changing climate[J]. Nature Geoscience,2013-01-01,6(3)