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AGU: Geophysical Research Letters

 

Keywords

  • solar impact
  • ENSO
  • NAM

Index Terms

  • Global Change: Solar variability
  • Atmospheric Processes: Climate change and variability
  • Atmospheric Processes: General circulation
  • Atmospheric Processes: Middle atmosphere dynamics
  • Atmospheric Processes: Stratosphere/troposphere interactions

Abstract

Solar modulation of the El-Niño/Southern Oscillation impact on the Northern Hemisphere annular mode

Vladimir N. Kryjov

APEC Climate Center, Busan, South Korea

Chung-Kyu Park

APEC Climate Center, Busan, South Korea

A statistical study reveals that the stratospheric circulation response to the El-Niño/Southern Oscillation (ENSO) significantly alters between opposite phases of the 11-year solar cycle. During solar cycle maxima, the ENSO impact is insignificant throughout the whole extratropical lower stratosphere. During solar cycle minima, the ENSO strongly impacts the lower stratosphere, with the response resembling the Northern Hemisphere annular mode (NAM) pattern in geopotential height fields and in zonal mean zonal flow. It explains the low statistical significance of the relationships between the NAM and ENSO when the data are not stratified according to solar cycle maximum and minimum.

Received 5 September 2006; accepted 23 January 2007; published 18 May 2007.

Citation: Kryjov, V. N., and C.-K. Park (2007), Solar modulation of the El-Niño/Southern Oscillation impact on the Northern Hemisphere annular mode, Geophys. Res. Lett., 34, L10701, doi:10.1029/2006GL028015.

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