DOI: 10.1175/JCLI-D-17-0674.1
Scopus记录号: 2-s2.0-85047081719
论文题名: Sources of intermodel spread in the lapse rate and water vapor feedbacks
作者: Po-Chedley S. ; Armour K.C. ; Bitz C.M. ; Zelinka M.D. ; Santer B.D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 8 起始页码: 3187
结束页码: 3206
语种: 英语
英文关键词: Climate change
; Climate models
; Climate sensitivity
Scopus关键词: Climate change
; Feedback
; Sea ice
; Tropics
; Troposphere
; Water vapor
; Antarctic sea ice
; Climate sensitivity
; General circulation model
; Model Differences
; Model discrepancies
; Modeling variability
; Southern Hemisphere
; Water vapor feedbacks
; Climate models
; carbon dioxide
; climate change
; climate feedback
; climate modeling
; computer simulation
; extratropical environment
; general circulation model
; numerical model
; Southern Hemisphere
; troposphere
; water vapor
; Southern Ocean
英文摘要: Sources of intermodel differences in the global lapse rate (LR) and water vapor (WV) feedbacks are assessed using CO2 forcing simulations from 28 general circulation models. Tropical surface warming leads to significant warming and moistening in the tropical and extratropical upper troposphere, signifying a nonlocal, tropical influence on extratropical radiation and feedbacks. Model spread in the locally defined LR and WV feedbacks is pronounced in the Southern Ocean because of large-scale ocean upwelling, which reduces surface warming and decouples the surface from the tropospheric response. The magnitude of local extratropical feedbacks across models and over time is well characterized using the ratio of tropical to extratropical surface warming. It is shown that model differences in locally defined LR and WV feedbacks, particularly over the southern extratropics, drive model variability in the global feedbacks. The cross-model correlation between the global LR and WV feedbacks therefore does not arise from their covariation in the tropics, but rather from the pattern of warming exerting a common control on extratropical feedback responses. Because local feedbacks over the Southern Hemisphere are an important contributor to the global feedback, the partitioning of surface warming between the tropics and the southern extratropics is a key determinant of the spread in the global LR and WV feedbacks. It is also shown that model Antarctic sea ice climatology influences sea ice area changes and southern extratropical surface warming. As a result, model discrepancies in climatological Antarctic sea ice area have a significant impact on the intermodel spread of the global LR and WV feedbacks. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111566
Appears in Collections: 气候减缓与适应
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作者单位: Lawrence Livermore National Laboratory, Livermore, CA, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; School of Oceanography, University of Washington, Seattle, WA, United States
Recommended Citation:
Po-Chedley S.,Armour K.C.,Bitz C.M.,et al. Sources of intermodel spread in the lapse rate and water vapor feedbacks[J]. Journal of Climate,2018-01-01,31(8)