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A Siberian precursor to midwinter intraseasonal variability in the North Pacific storm track
Author(s) -
Robinson Dennis P.,
Black Robert X.,
McDaniel Brent A.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl026458
Subject(s) - storm track , climatology , rossby wave , storm , anomaly (physics) , tropical cyclone , cyclone (programming language) , troposphere , geology , environmental science , oceanography , physics , field programmable gate array , computer hardware , condensed matter physics , computer science
An observational diagnostic analysis is performed to study variations in the behavior of upper tropospheric Rossby waves prior to intraseasonal variability in the North Pacific storm track. The research is motivated from considerations of the midwinter suppression of the North Pacific storm track. During midwinter strong upper tropospheric cyclone events in the North Pacific storm track are preceded 7 days by a large‐scale cyclonic circulation anomaly located over Siberia. The Siberian precursor anomaly is found to be strongly linked to one of the primary modes of upper tropospheric intraseasonal variability over Asia. More generally, this Asian mode is determined to provide a substantial modulation in the structure and amplitude of the North Pacific storm track at lead times of +5 to +8 days. This downstream influence is concentrated during midwinter and is likely related to intraseasonal variations in the East Asian winter monsoon.