DOI: 10.1175/JCLI-D-18-0199.1
Scopus记录号: 2-s2.0-85054087287
论文题名: Metric-dependent tendency of tropical belt width changes during the last glacial maximum
作者: Wang N. ; Jiang D. ; Lang X.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 20 起始页码: 8527
结束页码: 8540
语种: 英语
英文关键词: Climate models
; Hadley circulation
; Ice age
; Jets
; Paleoclimate
Scopus关键词: Climate models
; Clouds
; Glacial geology
; Global warming
; Jets
; Troposphere
; Coupled Model Intercomparison Project
; Hadley circulation
; Ice age
; Last Glacial Maximum
; Meridional temperature gradient
; Northern Hemispheres
; Paleoclimate modelling
; Paleoclimates
; Tropics
英文摘要: Motivated by studies of tropical expansion under modern global warming, the behavior of the tropical belt during the Last Glacial Maximum (LGM) relative to the preindustrial period has been investigated in this study, using simulations from phase 3 of the Paleoclimate Modelling Intercomparison Project (PMIP3) under the framework of phase 5 of the Coupled Model Intercomparison Project (CMIP5). The tropical belt width changes determined by multiple metrics present two opposite tendencies. One refers to the poleward migration of the tropical edge as measured by the steep tropopause gradient and the subtropical jet, and the other suggests that the LGM tropics become narrower as measured by the Hadley cell extent, the eddy-driven jet, and the latitude where precipitation minus evaporation equals zero. The magnitude of such changes widely differs across models and metrics. In absolute terms, the multimodel mean total width changes range from 0.6° to 1.7° among metrics, with contributions predominantly from the Northern Hemisphere. Furthermore, the two metrics that indicate tropical widening are located in the upper troposphere. Such widening is closely related to the vertical and meridional temperature gradient changes in the subtropical regions. The other metrics are located in the middle and lower troposphere, and their variations are directly or indirectly related to changes in the low-level baroclinicity. The diverse responses of metrics to the LGM boundary conditions suggest that the tropical belt width changes and their climatic impacts are distinguished by the different measurements. The selection of metrics should correspond to the specific tropical properties of concern. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110638
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China; Joint Laboratory for Climate and Environmental Change, Chengdu University of Information Technology, Chengdu, China; Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Wang N.,Jiang D.,Lang X.. Metric-dependent tendency of tropical belt width changes during the last glacial maximum[J]. Journal of Climate,2018-01-01,31(20)