Source apportionment of PM2.5 organic aerosol over Europe: Primary/secondary, natural/anthropogenic, and fossil/biogenic origin
Artikel i vetenskaplig tidskrift, 2007

On the basis of a 2-year comprehensive data set obtained within the CARBOSOL project, seasonal source apportionment of PM2.5 aerosol is attempted for five rural/remote sites in Europe. The approach developed combines radiocarbon measurements with bulk measurements of organic carbon (OC), elemental carbon (EC), and two organic tracers ( levoglucosan and cellulose). Source types are lumped into primary emissions from fossil fuel combustion and biomass burning, bioaerosol, and secondary organic aerosol from precursors emitted by fossil and nonfossil sources. Bulk concentration ratios reported for these source types in the literature are used to estimate the source contributions which are constrained by measured radiocarbon concentrations. It has been found that while fossil-related sources predominate EC throughout the year at all sites, the sources of OC are primarily biogenic and markedly different between summer and winter. In winter biomass burning primary emission is the main source, with sizable additional contribution from fossil fuel combustion. In contrast, in summer secondary organic aerosol (SOA) from nonfossil sources becomes predominant (63-76% of TC), with some contribution of SOA from fossil fuel combustion. The results agree well with recent findings of other authors who established the predominance of biogenic SOA for rural sites in summer in Europe. An uncertainty analysis has been conducted, which shows that the main conclusions from this study are robust.

SENSITIVITY-ANALYSIS

SOURCE PROFILES

FINE-PARTICLE EMISSIONS

LOS-ANGELES

UNITED-STATES

CHEMICAL-CHARACTERIZATION

MOLECULAR TRACERS

AIR-QUALITY

CARBONACEOUS AEROSOLS

ELEMENTAL CARBON

Författare

A. Gelencser

Pannon Egyetem

B. May

Universität Heidelberg

David Simpson

Chalmers, Institutionen för radio- och rymdvetenskap

A. Sanchez-Ochoa

Technische Universität Wien

A. Kasper-Giebl

Technische Universität Wien

H. Puxbaum

Technische Universität Wien

A. Caseiro

Universidade de Aveiro

C. Pio

Universidade de Aveiro

M. Legrand

CNRS Centre National de la Recherche Scientifique

Journal of Geophysical Research

0148-0227 (ISSN)

Vol. 112 12-

Ämneskategorier

Fysik

DOI

10.1029/2006jd008094