© Author(s) 2006. This work is licensed under a Creative Commons License. Atmospheric Chemistry and Physics The 1986–1989 ENSO cycle in a chemical climate model

• Main Authors: S. Brönnimann, M. Schraner, B. Müller, A. Fischer, D. Brunner, E. Rozanov, T. Egorova
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2006
• Subjects: North Atlantic
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.404.8429; http://hal.archives-ouvertes.fr/docs/00/29/60/56/PDF/acp-6-4669-2006.pdf

Abstract. A pronounced ENSO cycle occurred from 1986 to 1989, accompanied by distinct dynamical and chemical anomalies in the global troposphere and stratosphere. Reproducing these effects with current climate models not only provides a model test but also contributes to our still limited understanding of ENSO’s effect on stratosphere-troposphere coupling. We performed several sets of ensemble simulations with a chemical climate model (SOCOL) forced with global sea surface temperatures. Results were compared with observations and with large-ensemble simulations performed with an atmospheric general circulation model (MRF9). We focus our analysis on the extratropical stratosphere and its coupling with the troposphere. In this context, the circulation over the North Atlantic sector is particularly important. Relative to the La Niña winter 1989, observations for the El Niño winter