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Open Access item Fossil versus contemporary sources of fine elemental and organic carbonaceous particulate matter during the DAURE campaign in Northeast Spain.
|Authors:||Minguillón, M. C.|
Fahrni, S. M.
Jiménez, J. L.
Ortega, A. M.
Day, D. A.
Lanz, V. A.
Burkhart, J. F.
Prévôt, A. S. H.
|Publisher:||European Geosciences Union|
|Citation:||Atmos. Chem. Phys. 11 : 12067–12084 (2011)|
|Abstract:||We present results from the international ﬁeld
campaign DAURE (Determination of the sources of atmospheric Aerosols in Urban and Rural Environments in the
Western Mediterranean), with the objective of apportioning the sources of ﬁne carbonaceous aerosols. Submicron
ﬁne particulate matter (PM1) samples were collected during February–March 2009 and July 2009 at an urban background site in Barcelona (BCN) and at a forested regional
background site in Montseny (MSY). We present radiocarbon (
C) analysis for elemental and organic carbon (EC
and OC) and source apportionment for these data. We
combine the results with those from component analysis
of aerosol mass spectrometer (AMS) measurements, and compare to levoglucosan-based estimates of biomass burning OC, source apportionment of ﬁlter data with inorganic
composition + EC + OC, submicron bulk potassium (K) concentrations, and gaseous acetonitrile concentrations.
At BCN, 87 % and 91 % of the EC on average, in winter and summer, respectively, had a fossil origin, whereas
at MSY these fractions were 66 % and 79 %. The contribution of fossil sources to organic carbon (OC) at BCN
was 40 % and 48 %, in winter and summer, respectively,
and 31 % and 25 % at MSY. The combination of results obtained using the
C technique, AMS data, and the correlations between fossil OC and fossil EC imply that the fossil OC at Barcelona is ∼47 % primary whereas at MSY the
fossil OC is mainly secondary (∼85 %). Day-to-day variation in total carbonaceous aerosol loading and the relative
contributions of different sources predominantly depended
on the meteorological transport conditions. The estimated biogenic secondary OC at MSY only increased by ∼40 %
compared to the order-of-magnitude increase observed for
biogenic volatile organic compounds (VOCs) between winter and summer, which highlights the uncertainties in the
estimation of that component. Biomass burning contributions estimated using the
C technique ranged from similar to slightly higher than when estimated using other techniques, and the different estimations were highly or moderately correlated. Differences can be explained by the contribution of secondary organic matter (not included in the primary biomass burning source estimates), and/or by an overestimation of the biomass burning OC contribution by the
C technique if the estimated biomass burning EC/OC ratio
used for the calculations is too high for this region. Acetonitrile concentrations correlate well with the biomass burning
EC determined by
C. K is a noisy tracer for biomass burning.|
|Description:||18 páginas, 8 figuras, 1 tabla.|
|Publisher version (URL):||http://dx.doi.org/10.5194/acp-11-12067-2011|
|E-ISSNmetadata.dc.identifier.doi = DOI:||1680-7324|
|Appears in Collections:||(CEAB) Artículos|
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