HR: 0800h
AN: A11B-0048    [Abstracts]
TI: Global Modelling of NOx Emissions From Snow
AU: * Carver, G D
EM: Glenn.Carver@atm.ch.cam.ac.uk
AF: Centre for Atmospheric Science, Dept. of Chemistry, Lensfield Road, Cambridge, CB2 1EW United Kingdom
AU: Jones, A E
EM: aejo@bas.ac.uk
AF: British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET United Kingdom
AU: Wolff, E W
EM: ewwo@bas.ac.uk
AF: British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET United Kingdom
AB: Recent measurements from Antarctica and other regions have demonstrated that NOx is produced photochemically within snowpacks and then released to the overlying atmosphere. Such a release is likely to be an important source of NOx in snow covered regions, particularly those remote from anthropogenic sources. Given the extent of snow fields globally, NOx emissions from snow may also provide a significant additional global source of NOx. We report here on numerical simulations run in a 3D chemical transport model (p-TOMCAT) aimed at assessing the significance of snowpack emissions of NOx on the global troposphere and snow covered regions. The model has a detailed tropospheric chemistry into which NOx emissions based on observed snow cover have been included. We present results from a number of multi-annual integrations designed to assess the impact and sensitivity, both globally and regionally, to snowpack NOx emissions.
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting