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DOI | 10.1002/joc.6015 |
A thermodynamic climatology of the disturbed stratospheric polar vortex | |
Ehrmann, Thomas S.; Colucci, Stephen J. | |
2019-06-15 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY |
ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2019 |
卷号 | 39期号:7页码:3241-3256 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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. |
英文关键词 | final warmings geometric moments polar vortex polar vortex disturbances SSWs troposphere-stratosphere interactions |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000475693500010 |
WOS关键词 | COLD-AIR OUTBREAKS ; QUASI-BIENNIAL OSCILLATION ; EVENTS ; PREDICTION ; PRECURSOR |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/184052 |
专题 | 气候变化 |
作者单位 | Cornell Univ, Dept Earth & Atmospher Sci, Bradfield Hall, Ithaca, NY 14853 USA |
推荐引用方式 GB/T 7714 | Ehrmann, Thomas S.,Colucci, Stephen J.. A thermodynamic climatology of the disturbed stratospheric polar vortex[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2019,39(7):3241-3256. |
APA | Ehrmann, Thomas S.,&Colucci, Stephen J..(2019).A thermodynamic climatology of the disturbed stratospheric polar vortex.INTERNATIONAL JOURNAL OF CLIMATOLOGY,39(7),3241-3256. |
MLA | Ehrmann, Thomas S.,et al."A thermodynamic climatology of the disturbed stratospheric polar vortex".INTERNATIONAL JOURNAL OF CLIMATOLOGY 39.7(2019):3241-3256. |
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