DOI: 10.1175/JCLI-D-16-0605.1
Scopus记录号: 2-s2.0-85017139924
论文题名: A Lagrangian climatology of wintertime cold air outbreaks in the Irminger and Nordic Seas and their role in shaping air-sea heat fluxes
作者: Papritz L. ; Spengler T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 8 起始页码: 2717
结束页码: 2737
语种: 英语
Scopus关键词: Atmospheric movements
; Climatology
; Heat flux
; Trajectories
; Air sea interactions
; Cold air
; Cold air outbreak
; Kinematic trajectories
; Mass fluxes/transport
; North Atlantic Ocean
; Thermodynamic evolution
; Transport pathways
; Oceanography
英文摘要: Understanding the climatological characteristics of marine cold air outbreaks (CAOs) is of critical importance to constrain the processes determining the heat flux forcing of the high-latitude oceans. In this study, a comprehensive multidecadal climatology of wintertime CAO air masses is presented for the Irminger Sea and Nordic seas. To investigate the origin, transport pathways, and thermodynamic evolution of CAO air masses, a novel methodology based on kinematic trajectories is introduced. The major conclusions are as follows: (i) The most intense CAOs occur as a result of Arctic outflows following Greenland's eastern coast from the Fram Strait southward and west of Novaya Zemlya. Weak CAOs also originate in flow across the SST gradient associated with the Arctic Front separating the Greenland and Iceland Seas from the Norwegian Sea. A substantial fraction of Irminger CAO air masses originate in the Canadian Arctic and overflow southern Greenland. (ii) CAOs account for 60%-80% of the wintertime oceanic heat loss associated with few intense CAOs west of Svalbard and in the Greenland, Iceland, and Barents Seas and frequent weak CAOs in the Norwegian and Irminger Seas. (iii) The amount of sensible heat extracted by CAO air masses is set by their intensity and their pathway over the underlying SST distribution, whereas the amount of latent heat is additionally capped by the SST. (iv) Among all CAO air masses, those in the Greenland and Iceland Seas extract the most sensible heat from the ocean and undergo the most intense diabatic warming. Irminger Sea CAO air masses experience only moderate diabatic warming but pick up more moisture than the other CAO air masses. © 2017 American Meteorological Society. 资助项目: UiB, Universitetet i Bergen
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49721
Appears in Collections: 气候变化事实与影响
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作者单位: Geophysical Institute, University of Bergen, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway
Recommended Citation:
Papritz L.,Spengler T.. A Lagrangian climatology of wintertime cold air outbreaks in the Irminger and Nordic Seas and their role in shaping air-sea heat fluxes[J]. Journal of Climate,2017-01-01,30(8)