The Antarctic Oscillation Structure in an AOGCM with Interactive Stratospheric Ozone

Based on 150-year equilibrium simulations using the atmosphere-ocean-sea ice general circulation model (AOGCM) ECHOGiSP, the southern hemisphere winter circulation is examined focusing on tropo-stratosphere coupling and wave dynamics. The model covers the troposphere and strato-mesosphere up to 80 k...

Full description

Bibliographic Details
Published in:ISRN Meteorology
Main Authors: Brand, Sascha, Dethloff, Klaus, Handorf, Dörthe
Format: Article in Journal/Newspaper
Language:unknown
Published: International Scholarly Research Network 2012
Subjects:
Online Access:https://epic.awi.de/id/eprint/31484/
https://epic.awi.de/id/eprint/31484/1/Brand_etal_2012_518096.pdf
https://hdl.handle.net/10013/epic.40266
https://hdl.handle.net/10013/epic.40266.d001
Description
Summary:Based on 150-year equilibrium simulations using the atmosphere-ocean-sea ice general circulation model (AOGCM) ECHOGiSP, the southern hemisphere winter circulation is examined focusing on tropo-stratosphere coupling and wave dynamics. The model covers the troposphere and strato-mesosphere up to 80 km height and includes an interactive stratospheric chemistry. Compared to the reference simulation without interactive chemistry, the interactive simulation shows a weaker polar vortex in the middle atmosphere and is shifted towards the negative phase of the Antarctic Oscillation (AAO) in the troposphere. Differing from the northern hemisphere winter situation, the tropospheric planetary wave activity is weakened. A detailed analysis shows, that the modelled AAO zonal mean signal behaves antisymmetrically between troposphere and strato-mesosphere. This conclusion is supported by reanalysis data and a discussion of planetary wave dynamics in terms of Eliassen-Palm fluxes. Thereby, the tropospheric planetary wave activity appears to be controlled from the middle atmosphere.