Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-017-3524-1 |
Intra-seasonal variability of extreme boreal stratospheric polar vortex events and their precursors | |
Diaz-Duran, Adelaida1; Serrano, Encarna1; Ayarzaguena, Blanca2; Abalos, Marta3; de la Camara, Alvaro3 | |
2017-11-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 49 |
文章类型 | Article |
语种 | 英语 |
国家 | Spain; England; USA |
英文摘要 | The dynamical variability of the boreal stratospheric polar vortex has been usually analysed considering the extended winter as a whole or only focusing on December, January and February. Yet recent studies have found intra-seasonal differences in the boreal stratospheric dynamics. In this study, the intra-seasonal variability of anomalous wave activity preceding polar vortex extremes in the Northern Hemisphere is examined using ERA-Interim reanalysis data. Weak (WPV) and strong (SPV) polar vortex events are grouped into early, mid- or late winter sub-periods depending on the onset date. Overall, the strongest (weakest) wave-activity anomalies preceding polar vortex extremes are found in mid- (early) winter. Most of WPV (SPV) events in early winter occur under the influence of east (west) phase of the Quasi-Biennial Oscillation (QBO) and an enhancement (inhibition) of wavenumber-1 wave activity (WN1). Mid- and late winter WPV events are preceded by a strong vortex and an enhancement of WN1 and WN2, but the spatial structure of the anomalous wave activity and the phase of the QBO are different. Prior to mid-winter WPVs the enhancement of WN2 is related to the predominance of La Nia and linked to blockings over Siberia. Mid-winter SPV events show a negative phase of the Pacific-North America pattern that inhibits WN1 injected into the stratosphere. This study suggests that dynamical features preceding extreme polar vortex events in mid-winter should not be generalized to other winter sub-periods. |
英文关键词 | Intra-seasonal variability Wave activity Stratospheric polar vortex extremes Tropospheric precursors Tropospheric forcing Stratospheric dynamics |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000414153800031 |
WOS关键词 | PLANETARY-WAVE-PROPAGATION ; SUDDEN WARMINGS ; NORTHERN-HEMISPHERE ; DOWNWARD PROPAGATION ; SURFACE TEMPERATURES ; WEATHER REGIMES ; WINTER ; TROPOSPHERE ; BLOCKING ; CLIMATE |
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/36346 |
专题 | 气候变化 |
作者单位 | 1.Univ Complutense Madrid, Fac CC Fis, Dept Geofis & Meteorol, Madrid, Spain; 2.Univ Exeter, Coll Engn Math & Phys Sci, Exeter, Devon, England; 3.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA |
推荐引用方式 GB/T 7714 | Diaz-Duran, Adelaida,Serrano, Encarna,Ayarzaguena, Blanca,et al. Intra-seasonal variability of extreme boreal stratospheric polar vortex events and their precursors[J]. CLIMATE DYNAMICS,2017,49. |
APA | Diaz-Duran, Adelaida,Serrano, Encarna,Ayarzaguena, Blanca,Abalos, Marta,&de la Camara, Alvaro.(2017).Intra-seasonal variability of extreme boreal stratospheric polar vortex events and their precursors.CLIMATE DYNAMICS,49. |
MLA | Diaz-Duran, Adelaida,et al."Intra-seasonal variability of extreme boreal stratospheric polar vortex events and their precursors".CLIMATE DYNAMICS 49(2017). |
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