DOI: 10.1175/JCLI-D-14-00447.1
Scopus记录号: 2-s2.0-84921676952
论文题名: A new look at the summer arctic frontal zone
作者: Crawford A. ; Serreze M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 2 起始页码: 737
结束页码: 754
语种: 英语
Scopus关键词: Ice control
; Sea ice
; Troposphere
; Atmospheric heating
; Horizontal temperature gradient
; Interannual variation
; Peak strength
; Sea ice retreats
; Seasonal characteristics
; Spatiotemporal variability
; Surface winds
; Snow
; atmospheric dynamics
; atmospheric front
; polar front
; polar region
; sea ice
; seasonal variation
; spatial variation
; summer
; temperature gradient
; topographic effect
; troposphere
; Alaska
; Arctic Ocean
; Canada
; Siberia
; United States
英文摘要: A notable characteristic of the summertime Arctic is the existence of a narrow band of strong horizontal temperature gradients spanning the coastlines of Siberia, Alaska, and western Canada that extends through a considerable depth of the troposphere. Past research has associated this summer Arctic Frontal Zone (AFZ) with contrasts in atmospheric heating between the Arctic Ocean and snow-free land, with its regional strength strongly influenced by topography; however, little is known about its variability. In this study, output from the latest generation of global atmospheric reanalyses is used to better constrain and define the summer AFZ, including its spatial and seasonal characteristics. The relative importance of different factors linked to its variability is then evaluated. The AFZ is best expressed in July and is manifested aloft as a separate Arctic jet feature at about 250 hPa. It is clearly associated with differential atmospheric heating, as evidenced by the sharp difference in surface energy balance terms between the Arctic Ocean and land. Furthermore, the AFZ is strongest over the coastline whether observed near the surface or throughout the troposphere. Interannual variations in peak strength of the AFZ are spatially heterogeneous and systematic near the surface (the 2-m level). Spatiotemporal variability is primarily dependent on factors affecting temperature over land, especially variability in cloud cover, surface wind direction, and the timing of the annual snow cover retreat. Local variability in the timing of annual sea ice retreat is also important through its control on temperatures over coastal seas. © 2015 American Meteorological Society. 资助项目: DGE, Division of Graduate Education
; NSF, Division of Graduate Education
; NSF, Division of Graduate Education
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50749
Appears in Collections: 气候变化事实与影响
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作者单位: Cooperative Institute for Research in Environmental Sciences, National Snow and Ice Data Center, and Department of Geography, University of Colorado Boulder, Boulder, CO, United States
Recommended Citation:
Crawford A.,Serreze M.. A new look at the summer arctic frontal zone[J]. Journal of Climate,2015-01-01,28(2)