Seminars

Lecturer: Marc von Hobe
Date: 2010-03-11 10:30
Place: Aniara

RECONCILE ? overview and first results from the Kiruna 2010 aircraft campaign

Laboratory experiments, field measurements and modelling studies are being carried out in the frame of the EU-project RECONCILE (Reconciliation of essential process parameters for an enhanced predictability of arctic stratospheric ozone loss and its climate interactions) to reach the following objectives

1. Reach quantitative understanding of the chemistry leading to polar ozone depletion
2. Improve our understanding of polar stratospheric cloud (PSC) microphysics and heterogeneous chlorine activation
3. Quantify the flux and mixing of air through the vortex edge and its impact on polar and mid-latitude ozone
4. Incorporate the improved parameterisations into a Chemistry Climate Model (CCM) to generate more reliable predictions for the future evolution of the ozone layer and its effects and sensitivities to climate, and test the improved CCM simulations against observed trends.

I will present a compact overview of the project activities and show first results, concentrating on the field campaign with the high-flying aircraft M55-Geophysica in Kiruna. In January, flights were carried out in the cold activated polar vortex: observations in different types of PSCs were made, halogen oxide observations will help to better constrain the kinetics of the major ozone destroying catalytic cycles, and extensive but rather distinct denitrification and renitrification layers were observed. Flights into the vortex rest in early March showed that significant ozone loss had occurred at least over aprt of the vortex.



Created 2010-01-20 10:08:15 by Uwe Raffalski
Last changed 2010-03-10 09:37:29 by Uwe Raffalski