DOI: 10.1175/JCLI-D-18-0431.1
Scopus记录号: 2-s2.0-85059649241
论文题名: The role of hadley circulation and lapse-rate changes for the future European summer climate
作者: Brogli R. ; Kröner N. ; Sørland S.L. ; Lüthi D. ; Schär C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 2 起始页码: 385
结束页码: 404
语种: 英语
英文关键词: Atmosphere
; Climate models
; Europe
; Hadley circulation
; Regional models
; Stability
Scopus关键词: Amplification
; Clouds
; Convergence of numerical methods
; Earth atmosphere
; Gas emissions
; Global warming
; Greenhouse gases
; Troposphere
; Europe
; Hadley circulation
; Lateral boundary conditions
; Pseudo-global warming methods
; Regional climate modeling (RCM)
; Regional model
; Simulation strategies
; Tropospheric humidity
; Climate models
; boundary condition
; climate modeling
; future prospect
; Hadley cell
; regional climate
; summer
; Southern Europe
英文摘要: By the end of the century, climate projections for southern Europe exhibit an enhanced near-surface summer warming in response to greenhouse gas emissions, which is known as the Mediterranean amplification. Possible causes for this amplified warming signal include a poleward Hadley cell expansion as well as tropospheric lapse-rate changes. In this work, regional climate model (RCM) simulations driven by three different global climate models (GCMs) are performed, representing the RCP8.5 emission scenario. For every downscaled GCM, the climate change signal over Europe is separated into five contributions by modifying the lateral boundary conditions of the RCM. This simulation strategy is related to the pseudo- global warming method. The results show that a poleward expansion of the Hadley cell is of minor importance for the Mediterranean amplification. During summer, the simulated Hadley circulation is weak, and projections show no distinct expansion in the European sector. The north-south contrast in lapse-rate changes is suggested as the most important factor causing the Mediterranean amplification. Lapse-rate changes are projected throughout Europe, but are weaker over the Mediterranean than over northern Europe (around 0.15 vs 0.3Kkm -1 by the end of the century). The weaker lapse-rate changes result in a strong near-surface summer warming over the Mediterranean, since the upper-tropospheric warming is of similar magnitude throughout Europe. The differing lapse-rate changes can be understood as a thermodynamic response to lower-tropospheric humidity contrasts. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117245
Appears in Collections: 气候变化与战略
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Recommended Citation:
Brogli R.,Kröner N.,Sørland S.L.,et al. The role of hadley circulation and lapse-rate changes for the future European summer climate[J]. Journal of Climate,2019-01-01,32(2)