The Multi-Wavelength Absorption Analyzer (MWAA) Model as a Tool for Source and Component Apportionment Based on Aerosol Absorption Properties : Application to Samples Collected in Different Environments
Articolo
Data di Pubblicazione:
2017
Citazione:
The Multi-Wavelength Absorption Analyzer (MWAA) Model as a Tool for Source and Component Apportionment Based on Aerosol Absorption Properties : Application to Samples Collected in Different Environments / V. Bernardoni, R. Pileci, L. Caponi, D. Massabò. - In: ATMOSPHERE. - ISSN 2073-4433. - 8:11(2017), pp. 218.1-218.18. [10.3390/atmos8110218]
Abstract:
The multi-wavelength absorption analyzer model (MWAA model) was recently proposed
to provide a source (fossil fuel combustion vs. wood burning) and a component (black carbon BC
vs. brown carbon BrC) apportionment of babs measured at different wavelengths, and to provide
the BrC Ångström Absorption exponent (αBrC). This paper shows MWAA model performances
and issues when applied to samples impacted by different sources. To this aim, the MWAA model
was run on samples collected at a rural (Propata) and an urban (Milan) site in Italy during the
winter period. Lower uncertainties on αBrC and a better correlation of the BrC absorption coefficient
(babs
BrC) with levoglucosan (tracer for wood burning) were obtained in Propata (compared to Milan).
Nevertheless, the correlation previously mentioned improved, especially in Milan, when providing
a priori information on αBrC to MWAA. Possible reasons for this improvement could be the more
complex mixture of sources present in Milan and the aging processes, which can affect aerosol
composition, particle mixing, and size distribution. OC and EC source apportionment showed that
wood burning was the dominating contributor to the carbonaceous fractions in Propata, whereas
a more complex situation was detected in Milan. Simultaneous babs(BC) apportionment and EC
measurements allowed MAC determination, which gave analogous results at the two sites.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Multi-Wavelength Absorption Analyzer model; optical component apportionment; optical source apportionment; aerosol absorption coefficient; polar photometer; brown carbon; black carbon; Ångström Absorption exponent; light absorption; optical measurements of particle-loaded filters
Elenco autori:
V. Bernardoni, R. Pileci, L. Caponi, D. Massabò
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