| DOI: | 10.1175/JCLI-D-11-00036.1
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| Scopus记录号: | 2-s2.0-84856979681
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| 论文题名: | Eurasian subarctic summer climate in response to anomalous snow cover |
| 作者: | Matsumura S.; Yamazaki K.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2012
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| 卷: | 25, 期:4 | | 起始页码: | 1305
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| 结束页码: | 1317
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| 语种: | 英语
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| Scopus关键词: | Asia
; Atmosphere-land interaction
; Blocking
; Europe
; Snow cover
; Jets
; Ocean currents
; Sea ice
; Snow melting systems
; Soil moisture
; Snow
; anticyclone
; baroclinic mode
; climate
; hydrology
; jet stream
; Rossby wave
; sea ice
; snow cover
; soil moisture
; storm track
; subarctic region
; summer
; Asia
; Europe
; Siberia
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| 英文摘要: | The summer climate in northern Eurasia is examined as a function of anomalous snow cover and processes associated with land-atmosphere coupling, based on a composite analysis using observational and reanalysis data. The analysis confirms that the snow-hydrological effect, which is enhanced soil moisture persisting later into the summer and contributing to cooling and precipitation recycling, is active in eastern Siberia and contributes to the formation of the subpolar jet through the thermal wind relationship in early snowmelt years. Strong anticyclonic differences (early - late snowmelt years) with a baroclinic structure form over eastern Siberia as a result of surface heating through the snow-hydrological effect in early snowmelt years. Surface heating contributes to the development of thermally generated stationary Rossby waves that propagate eastward to eastern Siberia. Rossby wave activity is maintained into early autumn, together with cyclonic differences over far eastern Siberia, in conjunction with the early appearance of snow cover in this region. The anticyclonic differences over eastern Siberia act like a blocking anticyclone, thereby strengthening upstream storm track activity. Furthermore, it is possible that surface anticyclonic differences over the Arctic contribute to year-to-year variability of summer Arctic sea ice concentration along the Siberian coast. The results suggest that variations in northern Eurasian snow cover and associated land-atmosphere coupling processes have important implications for the predictability of Eurasian subarctic summer climate. © 2012 American Meteorological Society. |
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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/52556
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Japan
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| Recommended Citation: | |
Matsumura S.,Yamazaki K.. Eurasian subarctic summer climate in response to anomalous snow cover[J]. Journal of Climate,2012-01-01,25(4)
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