DOI: 10.1007/s00382-014-2101-0
Scopus记录号: 2-s2.0-84958745584
论文题名: Observational constraints on the tropospheric and near-surface winter signature of the Northern Hemisphere stratospheric polar vortex
作者: Graf H.-F. ; Zanchettin D. ; Timmreck C. ; Bittner M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期: 12 起始页码: 3245
结束页码: 3266
语种: 英语
英文关键词: ENSO
; QBO
; Reanalysis
; Stratospheric polar vortex
; Teleconnections
; Volcanic eruptions
; Winter climate
英文摘要: A composite analysis of Northern Hemisphere’s mid-winter tropospheric anomalies under the conditions of strong and weak stratospheric polar vortex was performed on NCEP/NCAR reanalysis data from 1948 to 2013 considering, as additional grouping criteria, the coincidental states of major seasonally relevant climate phenomena, such as El Niño-Southern Oscillation (ENSO), Quasi Biennial Oscillation and strong volcanic eruptions. The analysis reveals that samples of strong polar vortex nearly exclusively occur during cold ENSO states, while a weak polar vortex is observed for both cold and warm ENSO. The strongest tropospheric and near-surface anomalies are found for warm ENSO and weak polar vortex conditions, suggesting that internal tropospheric circulation anomalies related to warm ENSO constructively superpose on dynamical effects from the stratosphere. Additionally, substantial differences are found between the continental winter warming patterns under strong polar vortex conditions in volcanically-disturbed and volcanically-undisturbed winters. However, the small-size samples obtained from the multi-compositing prevent conclusive statements about typical patterns, dominating effects and mechanisms of stratosphere-troposphere interaction on the seasonal time scale based on observational/reanalysis data alone. Hence, our analysis demonstrates that patterns derived from observational/reanalysis time series need to be taken with caution as they not always provide sufficiently robust constraints to the inferred mechanisms implicated with stratospheric polar vortex variability and its tropospheric and near-surface signature. Notwithstanding this argument, we propose a limited set of mechanisms that together may explain a relevant part of observed climate variability. These may serve to define future numerical model experiments minimizing the sample biases and, thus, improving process understanding. © 2014, Springer-Verlag Berlin Heidelberg. 资助项目: BMBF, Bundesministerium für Bildung und Forschung
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54605
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Centre for Atmospheric Science, University of Cambridge, Downing Place, Cambridge, United Kingdom; Max Planck Institute for Meteorology, Bundesstr. 53, Hamburg, Germany
Recommended Citation:
Graf H.-F.,Zanchettin D.,Timmreck C.,et al. Observational constraints on the tropospheric and near-surface winter signature of the Northern Hemisphere stratospheric polar vortex[J]. Climate Dynamics,2014-01-01,43(12)