DOI: 10.1175/JCLI-D-18-0307.1
Scopus记录号: 2-s2.0-85061819949
论文题名: Modulation of Arctic Sea ice loss by atmospheric teleconnections from Atlantic multidecadal variability
作者: Castruccio F.S. ; Ruprich-Robert Y. ; Yeager S.G. ; Danabasoglu G. ; Msadek R. ; Delworth T.L.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 5 起始页码: 1419
结束页码: 1441
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Sea ice
; Sea level
; Surface properties
; Atmospheric circulation patterns
; Atmospheric teleconnections
; Internal variability
; Multidecadal variability
; Ocean heat transport
; Surface temperature anomalies
; Surface temperatures
; Thermodynamic effect
; Climate models
英文摘要: Observed September Arctic sea ice has declined sharply over the satellite era. While most climate models forced by observed external forcing simulate a decline, few show trends matching the observations, suggesting either model deficiencies or significant contributions from internal variability. Using a set of perturbed climate model experiments, we provide evidence that atmospheric teleconnections associated with the Atlantic multidecadal variability (AMV) can drive low-frequency Arctic sea ice fluctuations. Even without AMVrelated changes in ocean heat transport, AMV-like surface temperature anomalies lead to adjustments in atmospheric circulation patterns that produce similar Arctic sea ice changes in three different climate models. Positive AMV anomalies induce a decrease in the frequency of winter polar anticyclones, which is reflected both in the sea level pressure as a weakening of the Beaufort Sea high and in the surface temperature as warm anomalies in response to increased low-cloud cover. Positive AMV anomalies are also shown to favor an increased prevalence of an Arctic dipole-like sea level pressure pattern in late winter/early spring. The resulting anomalous winds drive anomalous ice motions (dynamic effect). Combined with the reduced winter sea ice formation (thermodynamic effect), the Arctic sea ice becomes thinner, younger, and more prone to melt in summer. Following a phase shift to positive AMV, the resulting atmospheric teleconnections can lead to a decadal ice thinning trend in the Arctic Ocean on the order of 8%-16% of the reconstructed long-term trend, and a decadal trend (decline) in September Arctic sea ice area of up to 21% of the observed longterm trend. © 2019, American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117187
Appears in Collections: 气候变化与战略
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Recommended Citation:
Castruccio F.S.,Ruprich-Robert Y.,Yeager S.G.,et al. Modulation of Arctic Sea ice loss by atmospheric teleconnections from Atlantic multidecadal variability[J]. Journal of Climate,2019-01-01,32(5)