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



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ID: 20236.0, MPI für Meteorologie / Atmosphere in the Earth System
Observed interannual oscillations of planetary wave forcing in the Northern Hemisphere winter
Authors:Chen, W.; Graf, Hans F.; Takahashi, M.
Language:English
Date of Publication (YYYY-MM-DD):2002-11-15
Title of Journal:Geophysical Research Letters
Journal Abbrev.:Geophys. Res. Lett.
Volume:29
Issue / Number:22
Sequence Number of Article:2073
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Using NCEP-NCAR reanalysis data from 1958 to 1998, two interannual oscillations in the eddy forcing due to planetary waves (wavenumbers 1-3) are found in the Northern Hemisphere winter, called as the stratospheric interannual oscillation (SIO) and the tropospheric interannual oscillation (TIO). The temporal evolutions are different between the SIO and the TIO, suggesting different dynamic mechanisms. The planetary waves tend to be bent equatorward in the troposphere during a positive TIO phase, and in the mid- and upper stratosphere during a positive SIO phase. The result also suggests that upward propagation of planetary waves into the polar waveguide across the tropopause is closely associated with the TIO. Further regression and correlation analyses suggest that the TIO is closely linked to the Northern Annular Mode (NAM), whereas the SIO is closely associated with the El Nino/Southern Oscillation (ENSO).
External Publication Status:published
Document Type:Article
Affiliations:MPI für Meteorologie/Biogeochemical System/Analysis and Process Modelling
External Affiliations:Chinese Acad Sci, Inst Atmospher Phys, LASG, Beijing, Peoples R; China; Chinese Acad Sci, Inst Atmospher Phys, LASG, Beijing, Peoples R China; Univ Tokyo, Ctr Climate Syst Res, Tokyo, Japan
Identifiers:ISI:000180617000030
ISSN:0094-8276
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