DOI: 10.1175/JCLI-D-14-00258.1
Scopus记录号: 2-s2.0-84907049545
论文题名: Declining aerosols in CMIP5 projections: Effects on atmospheric temperature structure and midlatitude jets
作者: Rotstayn L.D. ; Plymin E.L. ; Collier M.A. ; Boucher O. ; Dufresne J.-L. ; Luo J.-J. ; Von Salzen K. ; Jeffrey S.J. ; Foujols M.-A. ; Ming Y. ; Horowitz L.W.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 18 起始页码: 6960
结束页码: 6977
语种: 英语
Scopus关键词: Midlatitudes
; aerosol
; air temperature
; atmospheric modeling
; greenhouse gas
; jet stream
; Northern Hemisphere
; radiative forcing
; Southern Hemisphere
; temperature gradient
; troposphere
; warming
; zonal wind
; Antarctica
; East Antarctica
; South Pole
英文摘要: The effects of declining anthropogenic aerosols in representative concentration pathway 4.5 (RCP4.5) are assessed in four models from phase 5 the Coupled Model Intercomparison Project (CMIP5), with a focus on annual, zonal-mean atmospheric temperature structure and zonal winds. For each model, the effect of declining aerosols is diagnosed from the difference between a projection forced by RCP4.5 for 2006-2100 and another that has identical forcing, except that anthropogenic aerosols are fixed at early twenty-first-century levels. The response to declining aerosols is interpreted in terms of the meridional structure of aerosol radiative forcing, which peaks near 40°N and vanishes at the South Pole. Increasing greenhouse gases cause amplified warming in the tropical upper troposphere and strengthening midlatitude jets in both hemispheres. However, for declining aerosols the vertically averaged tropospheric temperature response peaks near 40°N, rather than in the tropics. This implies that for declining aerosols the tropospheric meridional temperature gradient generally increases in the Southern Hemisphere (SH), but in the Northern Hemisphere (NH) it decreases in the tropics and subtropics. Consistent with thermal wind balance, the NH jet then strengthens on its poleward side and weakens on its equatorward side, whereas the SH jet strengthens more than the NH jet. The asymmetric response of the jets is thus consistent with the meridional structure of aerosol radiative forcing and the associated tropospheric warming: in the NH the latitude of maximum warming is roughly collocated with the jet, whereas in the SH warming is strongest in the tropics and weakest at high latitudes. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51083
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Australian Weather and Climate Research, CSIRO, Aspendale, VIC, Australia; Laboratoire de Me´te´orologie Dynamique, Institut Pierre-Simon Laplace, CNRS/UPMC, Paris, France; Centre for Australian Weather and Climate Research, Bureau of Meteorology, Melbourne, VIC, Australia; Canadian Centre for Climate Modelling and Analysis, Environment Canada, University of Victoria, Victoria, BC, Canada; Department of Science, Information Technology, Innovation and the Arts, Dutton Park, QLD, Australia; Institut Pierre-Simon Laplace, CNRS/UPMC, Paris, France; NOAA, Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States
Recommended Citation:
Rotstayn L.D.,Plymin E.L.,Collier M.A.,et al. Declining aerosols in CMIP5 projections: Effects on atmospheric temperature structure and midlatitude jets[J]. Journal of Climate,2014-01-01,27(18)