DOI: 10.1038/ngeo2091
论文题名: Influence of anthropogenic aerosols and the Pacific Decadal Oscillation on tropical belt width
作者: Allen R.J. ; Norris J.R. ; Kovilakam M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 4 起始页码: 270
结束页码: 274
语种: 英语
Scopus关键词: aerosol composition
; anthropogenic source
; atmospheric circulation
; global climate
; Northern Hemisphere
; Pacific Decadal Oscillation
; sea surface temperature
; tropical region
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: The tropical belt has widened by several degrees latitude since 1979, as evidenced by shifts in atmospheric circulation and climate zones. Global climate models also simulate tropical belt widening, but less so than observed. Reasons for this discrepancy and the mechanisms driving the expansion are uncertain. Here we analyse multidecadal variability in tropical belt width since 1950 using the Coupled Model Intercomparison Project Phase 5 climate model runs and find that simulated rates of tropical expansion over the past 30 years -particularly in the Northern Hemisphere -are in better agreement with observations than previous models. We find that models driven by observed sea surface temperatures over this interval yield the largest rate of tropical expansion. We link the tropical expansion in the Northern Hemisphere to the leading pattern of sea surface temperature variability in the North Pacific, the Pacific Decadal Oscillation. We also find, both from models and observations, that the tropical belt contracted in the Northern Hemisphere from 1950 to 1979, coincident with the reversal of the Pacific Decadal Oscillation trend. In both time periods, anthropogenic aerosols act to modify the Pacific Decadal Oscillation and therefore contribute to the width of the tropical belt. We conclude that tropical expansion and contraction are influenced by multidecadal sea surface temperature variability associated with both the Pacific Decadal Oscillation and anthropogenic aerosols. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106483
Appears in Collections: 气候减缓与适应 科学计划与规划
There are no files associated with this item.
作者单位: Department of Earth Sciences, University of California Riverside, Riverside, CA 92521, United States; Scripps Institution of Oceanography, University of California San Diego, San Diego, CA 92093, United States
Recommended Citation:
Allen R.J.,Norris J.R.,Kovilakam M.. Influence of anthropogenic aerosols and the Pacific Decadal Oscillation on tropical belt width[J]. Nature Geoscience,2014-01-01,7(4)