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National projects

MACESIZ - Marine Climate and Ecosystems in the Seasonal Ice Zone 

Within the MACESIZ project we have developed a new database with size and wavelength dependent extinction coefficients, single scattering albedo, and asymmetry parameters for several ice crystal shapes (e.g. bullet rosettes, Koch fractals, hexagonal columns and plates). The new parameters are applied in radiative transfer calculations to study the sensitivity of Arctic heat flux and radiative forcing related to various compositions of cirrus clouds, mixed-phase clouds, and surface conditions. Different observations of ice crystal size distributions have served as basis for the Arctic cloud parameterization. The model tool LibRadtran is used for radiative transfer calculations.

 

SORGA - Secondary ORganic Aerosols in urban Aerosols

SORGA is a project which aspires to understand and quantify the contribution of biogenic and anthropogenic components to the total PM. This includes in particular improved knowledge of secondary organic aerosol formation. The goal is to improve and validate 3D CTM-models by incorporating new SOA chemical modules. The project also aspires to identify to what extent the biogenic aerosol fraction is influenced by seasonal differences and meteorological conditions. Wood-burning might be a major contributor to biogenic carbon during the winter, whereas SOA formation from terpenes is believed to give a significant contribution to particulate matter during the summer time. Size distribution of 14C from radiocarbon measurements will provide information about the origin of biogenic aerosols.

In the end of June 2006 we will organize the first field campaigns in Oslo and Hurdal to measure several aerosol fractions and species, VOCs, and pollutants important for aerosol formation.

 

EU projects I have worked with


BOND (Biogenic Aerosols and Air Quality in the Mediterranean area)

Study formation of secondary organic aerosols (SOAs) from smog chamber experiments and implement new SOA modules in the MAPS box model and the CTM model UAM-AERO.

TRADEOFF (Aircraft emissions: Contributions of various climate compounds to changes in composition and radiative forcing - tradeoff to reduce atmospheric impact)

Retrieve cirrus clouds from the analysis of Meteosat imagery and develop Fortran code for cirrus detection based on the analysis of the thermal infrared channel on Meteosat. Study whether there is a trend in cirrus cloud cover due to aircraft traffic.

IMPACT (Innovative Modelling of Museum Pollution and conservation Thresholds).

Investigate the effect of air chemistry on the indoor level of pollutants in European Museums. Develop an indoor/outdoor model from an existing chemistry model.

SUB-AERO (Subgrid scale investigations of factors determining the occurrence of ozone and fine particles).

Develop routines for sea salt emissions, re-suspended dust, and biogenic VOC emissions (isoprene and monoterpenes) for use in the CTM model UAM-AERO.

URBAN-AEROSOL (Characterization of urban air quality indoor/outdoor particulate matter chemical characteristics and source-to-inhaled dose relationship).

Develop an indoor/outdoor model to estimate indoors levels of aerosols and pollutants as a function of outdoor air quality, ventilation rates, and physical environment.

 

Last updated, August 2006