DOI: 10.1007/s00382-016-3212-6
Scopus记录号: 2-s2.0-85016249478
论文题名: Tropospheric circulation during the early twentieth century Arctic warming
作者: Wegmann M. ; Brönnimann S. ; Compo G.P.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-07-08 起始页码: 2405
结束页码: 2418
语种: 英语
英文关键词: Arctic climate
; Arctic warming
; Circulation
; Climate change
; Heat flux
; Reanalysis
; Reconstructions
; Troposphere
英文摘要: The early twentieth century Arctic warming (ETCAW) between 1920 and 1940 is an exceptional feature of climate variability in the last century. Its warming rate was only recently matched by recent warming in the region. Unlike recent warming largely attributable to anthropogenic radiative forcing, atmospheric warming during the ETCAW was strongest in the mid-troposphere and is believed to be triggered by an exceptional case of natural climate variability. Nevertheless, ultimate mechanisms and causes for the ETCAW are still under discussion. Here we use state of the art multi-member global circulation models, reanalysis and reconstruction datasets to investigate the internal atmospheric dynamics of the ETCAW. We investigate the role of boreal winter mid-tropospheric heat transport and circulation in providing the energy for the large scale warming. Analyzing sensible heat flux components and regional differences, climate models are not able to reproduce the heat flux evolution found in reanalysis and reconstruction datasets. These datasets show an increase of stationary eddy heat flux and a decrease of transient eddy heat flux during the ETCAW. Moreover, tropospheric circulation analysis reveals the important role of both the Atlantic and the Pacific sectors in the convergence of southerly air masses into the Arctic during the warming event. Subsequently, it is suggested that the internal dynamics of the atmosphere played a major role in the formation in the ETCAW. © 2016, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53284
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Institute of Geography, University of Bern, Hallerstrasse 12, Bern, Switzerland; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; Physical Sciences Division, NOAA Earth System Research Laboratory, R/PSD1 325 Broadway, Boulder, CO, United States
Recommended Citation:
Wegmann M.,Brönnimann S.,Compo G.P.. Tropospheric circulation during the early twentieth century Arctic warming[J]. Climate Dynamics,2017-01-01,48(2017-07-08)