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Frauenfeld & Davis 2000
Frauenfeld, O.W. and Davis, R.E. (2000). The influence of El Niño-Southern Oscillation events on the northern hemisphere 500 hPa circumpolar vortex. Geophysical Research Letters 27: doi: 10.1029/1999GL010996. issn: 0094-8276.

The relationship between El Ni¿o, the Southern Oscillation, and their joint effect (ENSO), and Northern Hemisphere 500 hPa midlatitude circulation for the 1946--1994 observational record is determined. Seasonally standardized vortex positions at a spatial resolution of 5¿ longitude are correlated with an equatorial Pacific sea surface temperature anomaly index and the Southern Oscillation Index (SOI). The 500 hPa circumpolar vortex is consistently expanded over the central Pacific during and for the entire year following warm ENSO periods. The vortex is contracted over North America concurrently with warm ENSO and to a lesser degree during the following season. Expansion/contraction variability is also evident over east Asia, although the linkages to warm or cold ENSO are weak. Sea surface temperatures have a stronger association with the vortex than does the SOI. ¿ 2000 American Geophysical Union

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Abstract

Keywords
Meteorology and Atmospheric Dynamics, Climatology, Meteorology and Atmospheric Dynamics, General circulation, Meteorology and Atmospheric Dynamics, Ocean/atmosphere interactions (0312, 4504), Oceanography, General, Climate and interannual variability
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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