DOI: 10.1007/s00382-011-1137-7
Scopus记录号: 2-s2.0-84859000005
论文题名: Observational evidence of the delayed response of stratospheric polar vortex variability to ENSO SST anomalies
作者: Ren R.-C. ; Cai M. ; Xiang C. ; Wu G.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-07-08 起始页码: 1345
结束页码: 1358
语种: 英语
英文关键词: Delayed response
; ENSO
; Polar vortex variability
英文摘要: The temporal and spatial relationship between ENSO and the extratropical stratospheric variability in the Northern Hemisphere is examined. In general, there exists a negative correlation between ENSO and the strength of the polar vortex, but the maximum correlation is found in the next winter season after the mature phase of ENSO event, rather than in the concurrent winter. Specifically, the stratospheric polar vortex tends to be anomalously warmer and weaker in both the concurrent and the next winter season following a warm ENSO event, and vice versa. However, the polar anomalies in the next winter are much stronger and with a deeper vertical structure than that in the concurrent winter. Our analysis also shows that, the delayed stratospheric response to ENSO is characterized with poleward and downward propagation of temperature anomalies, suggesting an ENSO-induced interannual variability of the global mass circulation in the stratosphere. Particularly, in response to the growing of a warm ENSO event, there exist warm temperature and positive isentropic mass anomalies in the midlatitude stratosphere since the preceding summer. The presence of an anomalous wavenumber-1 in the concurrent winter, associated with an anomalous Aleutian high, results in a poleward extension of warm anomalies into the polar region, and thus a weaker stratospheric polar vortex. However, the midlatitude warm temperature and positive isentropic mass anomalies persist throughout the concurrent winter till the end of the next summer. In comparison with the concurrent winter, the strengthening of poleward heat transport by an anomalous wavenumber-2 in the next winter results in a much warmer and weaker polar vortex accompanied with a colder midlatitude stratosphere. © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55333
Appears in Collections: 过去全球变化的重建
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作者单位: LASG, Institute of Atmospheric Physics, CAS, 100029 Beijing, China; Department of Earth, Ocean, and Atmospheric Science, Florida State University, 32306 Tallahassee, FL, United States; National Meteorological Center, China Meteorological Administration, 100081 Beijing, China
Recommended Citation:
Ren R.-C.,Cai M.,Xiang C.,et al. Observational evidence of the delayed response of stratospheric polar vortex variability to ENSO SST anomalies[J]. Climate Dynamics,2012-01-01,38(2017-07-08)