[Zurück]

M Cerqueira, C. Pio, M. Legrand, H. Puxbaum, A. Kasper-Giebl, J. Afonso, S. Preunkert, A. Gelencser, P. Fialho:
"Particulate carbon in precipitation at European background sites";
Journal of Aerosol Science, 41 (2010), S. 51 - 61.

Particulate carbon in precipitation at European background sites. Cerqueira, Mario; Pio, Casimiro; Legrand, Michel; Puxbaum, Hans; Kasper-Giebl, Anne; Afonso, Joana; Preunkert, Susanne; Gelencser, Andras; Fialho, Paulo. CESAM & Department of Environment, University of Aveiro, Aveiro, Port. Journal of Aerosol Science (2010), 41(1), 51-61. Publisher: Elsevier Ltd., CODEN: JALSB7 ISSN: 0021-8502. Journal written in English. AN 2010:72342 CAPLUS

Abstract

The particulate carbon content of pptn. was investigated in samples collected at five background sites located over a west-east European transect, from the Azores, in the mid-Atlantic Ocean, to the Hungarian plain, in central Europe. Sampling was performed on an event basis and the particulate carbon (elemental carbon, EC, and water insol. org. carbon, WIOC) content was concd. on quartz filters for the subsequent anal. by a thermal optical method in order to sep. the EC and WIOC fractions. The av. EC concns. range from low values at the Azores (2.84.3 .mu.g C L-1) and at the high mountain site of Sonnblick (5.23.7 .mu.g C L-1) to high values at the more inland sites of Schauinsland (2838 .mu.g C L-1) and K-Puszta (2424 .mu.g C L-1). The av. WIOC concns. range from 9856 .mu.g C L-1 at the coastal site of Aveiro and 11378 .mu.g C L-1 at the Azores to 358194 .mu.g C L-1 at the continental site of K-Puszta. These results are discussed in terms of factors affecting the spatial distribution of particulate carbon, such as emissions from surrounding areas and prevalent meteorol. conditions. EC is found to be a minor contributor to total particulate carbon present in rain and snow samples (from 2.5% to 15%). This is particularly true at the remotes sites, where the EC contribution to total particulate carbon is <6.5%, consistent with a negligible impact of anthropogenic combustions locally. The EC and WIOC scavenging ratios were estd. and compared with those of sulfate, also evaluated at the same sampling sites. The results indicated that EC is removed from the atm. by wet deposition less efficiently than WIOC, and in turn this species is removed less efficiently than sulfate.

http://dx.doi.org/10.1016/j.jaerosci.2009.08.002