| DOI: | 10.1002/joc.6015
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| Scopus记录号: | 2-s2.0-85061349137
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| 论文题名: | A thermodynamic climatology of the disturbed stratospheric polar vortex |
| 作者: | Ehrmann T.S.; Colucci S.J.
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| 刊名: | International Journal of Climatology
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| ISSN: | 8998418
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| 出版年: | 2019
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| 语种: | 英语
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| 英文关键词: | final warmings
; geometric moments
; polar vortex
; polar vortex disturbances
; SSWs
; troposphere–stratosphere interactions
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| Scopus关键词: | Climatology
; Oscillators (mechanical)
; Thermodynamics
; Troposphere
; final warmings
; Geometric moment
; Northern Hemispheres
; Polar vortex
; Potential vorticity
; Quasi-biennial oscillation
; SSWs
; Stratospheric polar vortex
; Vortex flow
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| 英文摘要: | A climatology of polar vortex disturbances in the Northern Hemisphere winter stratosphere is constructed from MERRA2 Reanalysis data for the winter seasons of 1981–2017. Sixty disturbances (splits or displacements) of the polar vortex are identified during the 37 winter seasons using geometric moments of stratospheric potential vorticity. The likelihood of a disturbed day is negatively correlated with the stratospheric quasi-biennial oscillation (positively correlated with its easterly phase). It is also, surprisingly, negatively correlated with the presence of a stratospheric Aleutian anticyclone (the Aleutian high). The position of the polar vortex during each disturbance event is averaged to generate an area-averaging filter that is applied to thermodynamic diagnostic quantities in the air column enclosed by the polar vortex. This diagnosis reveals that the location of the disturbed polar vortex experiences, on average, cooling driven by horizontal temperature advection in the lower and middle stratosphere prior to the onset of the disturbance, along with significant residual (likely adiabatic) cooling in the troposphere in the weeks surrounding the onset. How these thermodynamic signatures associated with a disturbed polar vortex relate to the Aleutian high and the quasi-biennial oscillation is also explored. © 2019 Royal 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/116635
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| Appears in Collections: | 全球变化的国际研究计划
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作者单位: | Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States
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| Recommended Citation: | |
Ehrmann T.S.,Colucci S.J.. A thermodynamic climatology of the disturbed stratospheric polar vortex[J]. International Journal of Climatology,2019-01-01
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