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Arctic tropospheric ozone chemistry

Objective

To understand the mechanisms and extent of sudden arctic tropospheric ozone loss.


The arctic troposphere is subject to quite unique boundary conditions, like very stable stratification near the ground, or complete darkness during the arctic winter. Therefore, the chemical balance of the arctic troposphere is likely to be very sensitive to disturbing influences, for instance to free radical processes catalyzing boundary layer ozone destruction, as observed at several arctic sites. Those processes might have natural causes, but also possible is initiation by pollutants advected from western Europe. The phenomena certainly point to significant deficiencies in the understanding of the chemical species and processes involved. This project will address the following questions :

1. What is the role of free (halogen oxide) radicals in the phenomenon of arctic troposphere ozone loss ?
2. Is this disturbance a natural or an anthropogenic phenomenon ?
3. Which are the possible consequences of sudden arctic tropospheric ozone loss, in particular on the chemical conditions of the arctic lower troposphere ?
4. What is the spatial extent of the sudden tropospheric ozone loss phenomenon ?

The project will consist of three components :

1. Two field studies planned during springtime at arctic sites in Ny-Alesund/Spitzbergen and one to be selected.
2. Laboratory kinetic investigations of relevant homogeneous and heterogenous reactions at low temperature.
3. Modelling studies including gas phase and heterogeneous reactions and trajectory calculations.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

RUPRECHT-KARLS-UNIVERSITAET HEIDELBERG
Address
Im Neuenheimer Feld 229
69117 Heidelberg
Germany

Participants (7)

BERGISCHE UNIVERSITAET GESAMTHOCHSCHULE WUPPERTAL
Germany
Address
Gauss-straße 20
42097 Wuppertal
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
France
Address
Avenue De La Recherche Scientifique 1 C
45071 Orleans
DANISH METEOROLOGICAL INSTITUTE
Denmark
Address
100,Lyngbyvej 100
2100 Koepenhagen
Forschungszentrum Jülich GmbH
Germany
Address
Wilhelm-johnen-straße
52425 Jülich
MAX-PLANCK-GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.
Germany
Address

55020 Mainz
NORWEGIAN INSTITUTE FOR AIR RESEARCH
Norway
Address
Instituttveien 18
2027 Kjeller
UNIVERSITY OF EAST ANGLIA
United Kingdom
Address
University Plain Norwich Research Park
NR4 7TJ Norwich