DOI: 10.1002/2016GL070917
论文题名: Contrasting upper and lower atmospheric metrics of tropical expansion in the Southern Hemisphere
作者: Solomon A. ; Polvani L.M. ; Waugh D.W. ; Davis S.M.
刊名: Geophysical Research Letters
ISSN: 0094-8530
EISSN: 1944-8261
出版年: 2016
卷: 43, 期: 19 起始页码: 10496
结束页码: 10503
语种: 英语
英文关键词: Hadley circulation
; hydrological cycle
; jet latitude
; tropical expansion
; tropical width metrics
Scopus关键词: Expansion
; Decadal timescale
; Earth system model
; Hadley circulation
; Hydrological cycles
; Observational study
; Southern Hemisphere
; Symmetric components
; Tropical width metrics
; Tropics
英文摘要: Observational studies suggest that the tropics are expanding, but a wide range of expansion rates have been reported (from 0.2° to 2° of latitude per decade). This is due, in part, to the great variety of metrics used to define the tropical width. Here we ask whether these metrics are measuring tropical width consistently, focusing on the Southern Hemisphere, where the circulation is better approximated by the zonally symmetric component. Analyzing output from the Community Earth System Model (CESM) Large Ensemble Project, we show that tropical expansion robustly occurs in the model in response to forcings. In addition, we find that whereas the width of the Hadley circulation is strongly correlated with the midlatitude jet, from interannual to decadal time scales, it is essentially uncorrelated with upper atmospheric metrics, e.g., the maximum gradient of tropopause height, both in terms of variability and of response to forcings. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991080716&doi=10.1002%2f2016GL070917&partnerID=40&md5=6d5145a7bbaefb4d306964512963a013
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9493
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, United States
Recommended Citation:
Solomon A.,Polvani L.M.,Waugh D.W.,et al. Contrasting upper and lower atmospheric metrics of tropical expansion in the Southern Hemisphere[J]. Geophysical Research Letters,2016-01-01,43(19).