Dust specific extinction cross-sections over the Eastern Mediterranean using the BSC-DREAM model and sun photometer data: The case of urban environments

Gerasopoulos, E; Kokkalis, P; Amiridis, V; Liakakou, E; Perez, C; Haustein, K; Eleftheratos, K; Andreae, MO; Andreae, TW; Zerefos, CS

dc.contributor.author	Gerasopoulos, E	en
dc.contributor.author	Kokkalis, P	en
dc.contributor.author	Amiridis, V	en
dc.contributor.author	Liakakou, E	en
dc.contributor.author	Perez, C	en
dc.contributor.author	Haustein, K	en
dc.contributor.author	Eleftheratos, K	en
dc.contributor.author	Andreae, MO	en
dc.contributor.author	Andreae, TW	en
dc.contributor.author	Zerefos, CS	en
dc.date.accessioned	2014-03-01T01:30:14Z
dc.date.available	2014-03-01T01:30:14Z
dc.date.issued	2009	en
dc.identifier.issn	0992-7689	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19510
dc.subject	Atmospheric composition and structure (Aerosols and particles)	en
dc.subject	Instruments and techniques	en
dc.subject	Pollution - urban and regional	en
dc.subject.classification	Astronomy & Astrophysics	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.classification	Meteorology & Atmospheric Sciences	en
dc.subject.other	aerosol	en
dc.subject.other	atmospheric pollution	en
dc.subject.other	boundary layer	en
dc.subject.other	dust	en
dc.subject.other	estimation method	en
dc.subject.other	optical depth	en
dc.subject.other	particulate matter	en
dc.subject.other	photometer	en
dc.subject.other	urban pollution	en
dc.subject.other	Athens [Attica]	en
dc.subject.other	Attica	en
dc.subject.other	Greece	en
dc.title	Dust specific extinction cross-sections over the Eastern Mediterranean using the BSC-DREAM model and sun photometer data: The case of urban environments	en
heal.type	journalArticle	en
heal.identifier.primary	10.5194/angeo-27-2903-2009	en
heal.identifier.secondary	http://dx.doi.org/10.5194/angeo-27-2903-2009	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	In this study, aerosol optical depth (AOD) measurements, from a MFR sun photometer operating in Athens, were compared with columnar dust loading estimations, from the BSC-DREAM model, during identified dust events, in order to extract the typical specific extinction crosssection for dust over the area. The selected urban environment of Athens provided us with the opportunity to investigate the mixing of dust and urban pollution and to estimate the contribution of the latter. The specific extinction cross-section for dust at 500 nm was found to be equal to σ*500=0.64±0. 04m2 g, typical for medium to large distances from dust sources, with weak wavelength dependence in the visible and near infrared band (0.4-0.9μm). The model showed a tendency to underpredict AOD levels for increasing values of the Ångstrom̈ exponent, indicative of fine particles of anthropogenic origin inside the boundary layer. On average we found an AOD under-prediction of 10-15% for Ångstrom̈ exponents in the range of 0 to 1 and 30-40% in the range of 1 to 2. Additionally, modelled surface concentrations were evaluated against surface PM10 measurements. Model values were lower than measured surface concentrations by 30% which, in conjunction with large scatter, in-dicated that the effect of the boundary layer anthropogenic contribution to columnar dust loadings is amplified near the ground. &copy; 2009 Author(s).	en
heal.publisher	COPERNICUS PUBLICATIONS	en
heal.journalName	Annales Geophysicae	en
dc.identifier.doi	10.5194/angeo-27-2903-2009	en
dc.identifier.isi	ISI:000268622700026	en
dc.identifier.volume	27	en
dc.identifier.issue	7	en
dc.identifier.spage	2903	en
dc.identifier.epage	2912	en