| DOI: | 10.1175/JCLI-D-12-00841.1
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| Scopus记录号: | 2-s2.0-84898049146
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| 论文题名: | Relationship between snow extent and midlatitude disturbance centers |
| 作者: | Rydzik M.; Desai A.R.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2014
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| 卷: | 27, 期:8 | | 起始页码: | 2971
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| 结束页码: | 2982
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| 语种: | 英语
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| Scopus关键词: | Moisture
; Storms
; Changing climate
; High resolution
; Internal feedback
; Large-scale modeling
; Long-term observations
; Midlatitude cyclones
; Sea level pressure
; SIMPLE algorithm
; Snow
; climate change
; cyclone
; heat flux
; midlatitude environment
; moisture flux
; snow cover
; North America
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| 英文摘要: | A relationship between midlatitude cyclone (MLC) tracks and snow-cover extent has been discussed in the literature over the last 50 years but not explicitly analyzed with high-resolution and long-term observations of both. Large-scale modeling studies have hinted that areas near the edge of the snow extent support enhanced baroclinicity because of differences in surface albedo and moisture fluxes. In this study, the relationship between snow-cover extent and midlatitude disturbance (MLD) trajectories is investigated across North America using objectively analyzed midlatitude disturbance trajectories and snow-cover extent from the North American Regional Reanalysis (NARR) for 1979-2010. MLDs include low-level mesoscale disturbances through midlatitude cyclones. A high-resolution MLD database is developed from sea level pressure minima that are tracked through subsequent 3-h time steps, and a simple algorithm is developed that identified the southern edge of the snow-cover extent. A robust enhanced frequency of MLDs in a region 50-350km south of the snow-cover extent is found. The region of enhanced MLD frequency coincides with the region of maximum low-level baroclinicity. These observations support hypotheses of an internal feedback in which the snow-cover extent is leading the disturbance tracks through surface heat and moisture fluxes. Further, these results aid in the understanding of how midlatitude disturbance tracks may shift in a changing climate in response to snow-cover trends. © 2014 American Meteorological Society. |
| 资助项目: | DOE, U.S. Department of Energy
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/51038
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, Madison, Canada
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| Recommended Citation: | |
Rydzik M.,Desai A.R.. Relationship between snow extent and midlatitude disturbance centers[J]. Journal of Climate,2014-01-01,27(8)
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