American Geophysical Union Become an AGU Member
Subscribe to AGU Journals		 AGU Home AGU Publications

Read Full Article (file size: 1291345 bytes)    Cited by

GEOPHYSICAL RESEARCH LETTERS, VOL. 30, NO. 9, 1487, doi:10.1029/2003GL017006, 2003

Relationship between North Atlantic Oscillation changes and stratospheric ozone recovery in the Northern Hemisphere in a chemistry-climate model

Christina Schnadt

Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany


Martin Dameris

Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany


Abstract

The relationship between North Atlantic Oscillation (NAO) changes and northern stratospheric ozone recovery in the near future is investigated using four timeslice scenarios (1960, 1980, 1990, 2015) of the chemistry-climate model ECHAM4.L39(DLR)/CHEM. A wintertime NAO index composite study of the scenario “1990” and of the ECMWF reanalyses shows the typical NAO patterns: in the positive phase the stratospheric polar vortex is stronger and colder than in the negative phase. In the troposphere, the positive phase is marked by increased variance across the North Atlantic stormtrack whereas the negative phase is suggestive of blocking. Consistently, vertical stationary (transient) wave propagation is reduced (enhanced) in the positive phase. The model NAO index decreases significantly from “1990” to “2015”. This coincides with enhanced vertical stationary wave propagation and a dynamical heating of the northern polar stratosphere. Thus, tropospheric circulation changes might influence stratospheric dynamics and hence northern hemisphere ozone evolution.

Published 13 May 2003.

Index Terms: 3362 Meteorology and Atmospheric Dynamics: Stratosphere/troposphere interactions; 3334 Meteorology and Atmospheric Dynamics: Middle atmosphere dynamics (0341, 0342); 0341 Atmospheric Composition and Structure: Middle atmosphere—constituent transport and chemistry (3334).

Read Full Article (file size: 1291345 bytes)    Cited by

Citation: Schnadt, C., and M. Dameris (2003), Relationship between North Atlantic Oscillation changes and stratospheric ozone recovery in the Northern Hemisphere in a chemistry-climate model, Geophys. Res. Lett., 30(9), 1487, doi:10.1029/2003GL017006.