ENSO influence on the variability modes of the boreal winter stratosphere

  • Álvaro De La Cámara
  • Javier García-Serrano
  • Blanca Ayarzagüena
  • Marta Ábalos
  • Beatriz González
  • Encarna Serrano
Keywords: El Niño-Southern Oscillation, Variability modes, Stratospheric circulation

Abstract

The stratospheric circulation has been recently proposed to play an important role in transmitting the ENSO signal to the Euro-Atlantic region. In this context, the influence of ENSO on the boreal stratospheric modes of variability in winter is studied. A Principal Component Analysis of the geopotential height at 20 hPa is performed partitioning the data into El Niño and La Niña winters (1957/58-2001/02 period). It is found that the stratospheric annular mode retains almost a 10% more variance of the field for cold-La Niña than for warm-El Niño winters. On the other hand, zonal-wave-number-one modes accumulate more variability for warm-El Niño winters. Our results support the presence of more stratospheric wave-like anomalies coming from the troposphere during warm-El Niño conditions. Statistical linear correlation between ozone and stratospheric variability is restricted to the annular mode, being the signal stronger for warm- ENSO winters.

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Published
2010-01-28
How to Cite
De La Cámara Á. ., García-Serrano J. ., Ayarzagüena B. ., Ábalos M. ., González B. . y Serrano E. . (2010). ENSO influence on the variability modes of the boreal winter stratosphere. Física de la Tierra, 21, 167-178. https://revistas.ucm.es/index.php/FITE/article/view/FITE0909110167A
Issue
Vol. 21 (2009)
Section
Articles

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