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          Institute: MPI für Meteorologie     Collection: Atmosphere in the Earth System     Display Documents

ID: 304935.0, MPI für Meteorologie / Atmosphere in the Earth System
Life cycles of North Atlantic teleconnections under strong and weak polar vortex conditions
Authors:Walter, K.; Graf, H. F.
Date of Publication (YYYY-MM-DD):2006-01
Title of Journal:Quarterly Journal of the Royal Meteorological Society
Journal Abbrev.:Q. J. R. Meteorol. Soc.
Issue / Number:615
Start Page:467
End Page:483
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:This paper investigates the role of the strength of the polar stratospheric winter vortex in the dynamics of the life cycles of North Atlantic teleconnections. A new set of teleconnection patterns was produced from low-pass-filtered daily 300 hPa height data of NCEP (National Centers for Environmental Prediction) reanalysis data 1958-1998. All teleconnections are meridional dipoles, which to a certain degree resemble the North Atlantic Oscillation based on surface pressure data. There are two distinct teleconnections (one over the eastern and one over the western North Atlantic) during episodes of weak polar vortex, and only one, over the central North Atlantic, during strong polar vortex episodes. The teleconnections have periods of about two weeks. Stream function tendency analysis of the life cycles shows that the relatively simple resulting teleconnections evolve from very complex structures. During the growth phase of the teleconnection indices there are strong and systematic differences between the two polar vortex regimes. While in the weak vortex regime the anomaly growth is mainly driven by transient eddy vorticity fluxes from the low-frequency domain, in the strong vortex regime there is also low-frequency advection of relative vorticity resulting from the interaction of low-frequency eddies with stationary eddies. Copyright © 2006 Royal Meteorological Society
Free Keywords:North Atlantic Oscillation; polar vortex
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Communicated by:Carola Kauhs
Affiliations:MPI für Meteorologie/Atmosphere in the Earth System
External Affiliations:Centre for Atmospheric Science, Cambridge University Geography Department,Cambridge, UK.
Identifiers:ISI:000236697900011 [ID No:1]
ISSN:0035-9009 [ID No:2]
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