Open AccessInterannual modulation of extratropical high frequency variability
Author(s) -
Rodrigo Caballero
Publication year - 1997
Publication title -
annals of geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 60
eISSN - 2037-416X
pISSN - 1593-5213
DOI - 10.4401/ag-3886
Subject(s) - extratropical cyclone , climatology , mode (computer interface) , northern hemisphere , modulation (music) , geostrophic wind , atmospheric sciences , environmental science , meteorology , geology , physics , computer science , acoustics , operating system
A simple explanation is presented for the observed interannual changes in the dominant space and time scales of Northem Hemisphere winter extratropical high frequency variability. It is found that such changes can suc- cessfully be predicted by linearizing a 2-level quasi-geostrophic mode] in spherical geometry around the ob- served zona] mean states. The mechanisms responsible for the selection of the most unstable normal mode are investigated