HR: 17:45h
AN: A34B-08    [Abstracts]
TI: Carbon 14 Analysis of Carbonacous Aerosols in Oslo, Norway
AU: * Kelly, P B
EM: pbkelly@ucdavis.edu
AF: University of California, Department of Chemistry, Davis, CA 95616 United States
AU: Indresand, H
EM: hindresand@ucdavis.edu
AF: University of California, Department of Chemistry, Davis, CA 95616 United States
AU: Bench, G
EM: bench1@llnl.gov
AF: Lawrence Livermore National Laboratory, Center for Accelerator Mass Spectrometry P.O. Box 808, L-397, Livermore, CA 94550 United States
AU: Yttri, K
EM: karl.espen.yttri@nilu.no
AF: NILU Norwegian Institute for Air Research, Instituttveien 18, Kjeller, 2027 Norway
AU: Dye, C
EM: christian.dye@nilu.no
AF: NILU Norwegian Institute for Air Research, Instituttveien 18, Kjeller, 2027 Norway
AB: Oslo experiences severe atmospheric inversions during the winter months, trapping high concentrations of particulate matter. The city is situated at the north end of the Oslofjord with surrounding hills of 300-500 m. The organic fraction is of concern due to the associated health effects. The objective of the present study was to determine the relative contributions to fine particulate matter in Oslo where the two main sources are wood burning and traffic. Sampling was done in collaboration with the Norwegian Institute of Air Research (NILU) at Sofienberg Park, an urban residential site. Sampling was done with a LVS1.0 quartz filter sampler with a collection time of 48 hours. Night and day samples were obtained (6 pm to 6 am) and (6 am to 6 pm), respectively. Accelerator mass spectrometry at LLNL was used to quantify the ratio between biogenic and fossil fuel contributions by carbon 14 analysis. The total carbon aerosol was twice as high at night versus day during the coldest periods. The biogenic contribution was 70% of the aerosol during nighttime. The total carbon concentration showed a very high correlation (r > 0.93) with nighttime low temperature. Factors contributing to the source apportionment and temperature relationship will be discussed.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting