Scopus记录号: 2-s2.0-85047660075
论文题名: Summers with low Arctic sea ice linked to persistence of spring atmospheric circulation patterns
作者: Kapsch M.-L. ; Skific N. ; Graversen R.G. ; Tjernström M. ; Francis J.A.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2019
卷: 52, 期: 2019-03-04 起始页码: 2497
结束页码: 2512
语种: 英语
英文关键词: Arctic sea ice
; Atmospheric circulation
; Atmospheric energy transport
; Climate variability
; Self organizing maps (SOMs)
英文摘要: The declining trend of Arctic September sea ice constitutes a significant change in the Arctic climate system. Large year-to-year variations are superimposed on this sea–ice trend, with the largest variability observed in the eastern Arctic Ocean. Knowledge of the processes important for this variability may lead to an improved understanding of seasonal and long-term changes. Previous studies suggest that transport of heat and moisture into the Arctic during spring enhances downward surface longwave radiation, thereby controlling the annual melt onset, setting the stage for the September ice minimum. In agreement with these studies, we find that years with a low September sea–ice concentration (SIC) are characterized by more persistent periods in spring with enhanced energy flux to the surface in forms of net longwave radiation plus turbulent fluxes, compared to years with a high SIC. Two main atmospheric circulation patterns related to these episodes are identified: one resembles the so-called Arctic dipole anomaly that promotes transport of heat and moisture from the North Pacific, whereas the other is characterized by negative geopotential height anomalies over the Arctic, favoring cyclonic flow from Siberia and the Kara Sea into the eastern Arctic Ocean. However, differences between years with low and high September SIC appear not to be due to different spring circulation patterns; instead it is the persistence and intensity of processes associated with these patterns that distinguish the two groups of anomalous years: Years with low September SIC feature episodes that are consistently stronger and more persistent than years with high SIC. © 2018, The Author(s). 资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122395
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Meteorology and Bolin Centre for Climate Research, Stockholm University, Stockholm, 10691, Sweden; Max-Planck Institute for Meteorology, Bundesstraße 53, Hamburg, 20146, Germany; Department of Marine and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ 08901, United States; Department of Physics and Technology, University of Tromsø, Postbox 6050, Langnes, Tromsø, 9037, Norway
Recommended Citation:
Kapsch M.-L.,Skific N.,Graversen R.G.,et al. Summers with low Arctic sea ice linked to persistence of spring atmospheric circulation patterns[J]. Climate Dynamics,2019-01-01,52(2019-03-04)