| DOI: | 10.1175/JCLI-D-11-00174.1
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| Scopus记录号: | 2-s2.0-84858613526
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| 论文题名: | Changes in the extratropical storm tracks in response to changes in SST in an AGCM |
| 作者: | Graff L.S.; LaCasce J.H.
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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:6 | | 起始页码: | 1854
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| 结束页码: | 1870
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| 语种: | 英语
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| Scopus关键词: | Atmospheric baroclinicity
; Atmospheric general circulation models
; Climate simulation
; Contributing factor
; Extratropical storms
; Hadley cells
; Hadley circulation
; Heating pattern
; Low latitudes
; Lower boundary conditions
; Meridional overturning circulations
; Midlatitudes
; Momentum flux
; Northern hemisphere
; Ocean temperature
; Poleward shift
; Sea surface temperatures
; Storm track
; Storm tracks
; Subtropical jet
; Dynamics
; Earth atmosphere
; Storms
; atmospheric dynamics
; atmospheric general circulation model
; boundary condition
; climate change
; computer simulation
; experimental study
; extratropical environment
; Hadley cell
; meridional circulation
; Northern Hemisphere
; observational method
; overturn
; sea surface temperature
; storm track
; warming
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| 英文摘要: | A poleward shift in the extratropical storm tracks has been identified in observational and climate simulations. The authors examine the role of altered sea surface temperatures (SSTs) on the storm-track position and intensity in an atmospheric general circulation model (AGCM) using realistic lower boundary conditions. A set of experiments was conducted in which the SSTs where changed by 2 K in specified latitude bands. The primary profile was inspired by the observed trend in ocean temperatures, with the largest warming occurring at low latitudes. The response to several other heating patterns was also investigated, to examine the effect of imposed gradients and low- versus high-latitude heating. The focus is on the Northern Hemisphere (NH) winter, averaged over a 20-yr period. Results show that the storm tracks respond to changes in both the mean SST and SST gradients, consistent with previous studies employing aquaplanet (water only) boundary conditions. Increasing the mean SST strengthens the Hadley circulation and the subtropical jets, causing the storm tracks to intensify and shift poleward. Increasing the SST gradient at midlatitudes similarly causes an intensification and a poleward shift of the storm tracks. Increasing the gradient in the tropics, on the other hand, causes the Hadley cells to contract and the storm tracks to shift equatorward. Consistent shifts are seen in the mean zonal velocity, the atmospheric baroclinicity, the eddy heat and momentum fluxes, and the atmospheric meridional overturning circulation. The results support the idea that oceanic heating could be a contributing factor to the observed shift in the storm tracks. © 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/52513
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Meteorology and Oceanography Section, Department of Geosciences, University of Oslo, Oslo, Norway
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| Recommended Citation: | |
Graff L.S.,LaCasce J.H.. Changes in the extratropical storm tracks in response to changes in SST in an AGCM[J]. Journal of Climate,2012-01-01,25(6)
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