DOI: 10.1175/JCLI-D-16-0887.1
Scopus记录号: 2-s2.0-85027279004
论文题名: Synoptic conditions, clouds, and sea ice melt onset in the Beaufort and Chukchi seasonal ice zone
作者: Liu Z. ; Schweiger A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 17 起始页码: 6999
结束页码: 7016
语种: 英语
Scopus关键词: Advection
; Atmospheric boundary layer
; Atmospheric humidity
; Atmospheric structure
; Boundary layers
; Climatology
; Clouds
; Life cycle
; Sea ice
; Upper atmosphere
; Arctic
; Cloud microphysics
; Highest temperature
; Precipitable water
; Seasonal ice zones
; Spatial variability
; Synoptic climatology
; Synoptic conditions
; Ice
英文摘要: Cloud response to synoptic conditions over the Beaufort and Chukchi seasonal ice zone is examined. Four synoptic states with distinct thermodynamic and dynamic signatures are identified using ERA-Interim reanalysis data from 2000 to 2014. CloudSat and CALIPSO observations suggest control of clouds by synoptic states. Warm continental air advection is associated with the fewest low-level clouds, while cold air advection generates the most low-level clouds. Low-level clouds are related to lower-tropospheric stability and both are regulated by synoptic conditions. High-level clouds are associated with humidity and vertical motions in the upper atmosphere. Observed cloud vertical and spatial variability is reproduced well in ERA-Interim, but winter low-level cloud fraction is overestimated. This suggests that synoptic conditions constrain the spatial extent of clouds through the atmospheric structure, while the parameterizations for cloud microphysics and boundary layer physics are critical for the life cycle of clouds in numerical models. Sea ice melt onset is related to synoptic conditions. Melt onsets occur more frequently and earlier with warm air advection. Synoptic conditions with the highest temperatures and precipitable water are most favorable for melt onsets even though fewer low-level clouds are associated with these conditions. © 2017 American Meteorological Society. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49778
Appears in Collections: 气候变化事实与影响
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作者单位: Polar Science Center, Applied Physics Laboratory, University of Washington, Seattle, WA, United States
Recommended Citation:
Liu Z.,Schweiger A.. Synoptic conditions, clouds, and sea ice melt onset in the Beaufort and Chukchi seasonal ice zone[J]. Journal of Climate,2017-01-01,30(17)