PhD Defense by Gitte Brandt Hedegaard – Niels Bohr Institute - University of Copenhagen

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PhD Defense by Gitte Brandt Hedegaard

Future Air Pollution Levels in the Northern Hemisphere
Sensitivity to climate change and projected emissions

Abstract:
Key words:
Climate change, Emissions, Future air pollution levels, Interactions
Climate change impacts the atmospheric composition of the atmosphere, since the concentration of chemical species in the atmosphere depends on different meteorological parameters and hence is sensitive to changes in the climate. A model framework has been setup where the Danish Eulerian Hemispheric Model (DEHM) has been driven on past, present and future meteorology projected by the Atmosphere-Ocean Climate model ECHAM5/MPI-OM. Several simulations have been carried out with the DEHM model forced with different combinations of meteorology and emission scenario data in order to investigate the impact of climate change and emission change on future air pollution levels. Ozone, black carbon, total nitrogen, total sulphate and PM2.5 have been thoroughly investigated. The signal from the changes in anthropogenic emissions dominates for most species. However, opposing effects from impact of climate change and emission change are found for some species implying a so called "climate penalty"; to reach a certain reduction level further actions needs to be taken into account in air pollution regulation in order to counteract the impact of climate change.

Internal Supervisor:
Aksel Walløe Hansen, Niels Bohr Institute, University of Copenhagen

External Supervisor:
Jørgren Brandt, Department of Environmental Science, Aarhus University
Jens Hesselbjerg Christensen, Danish Meteorological Institute