Characterisation of aerosol properties and radiative forcing at an anthropogenically perturbed continental site

Koloutsou-Vakakis, S; Carrico, CM; Li, Z; Rood, MJ; Ogren, JA

dc.contributor.author	Koloutsou-Vakakis, S	en
dc.contributor.author	Carrico, CM	en
dc.contributor.author	Li, Z	en
dc.contributor.author	Rood, MJ	en
dc.contributor.author	Ogren, JA	en
dc.date.accessioned	2014-03-01T01:48:50Z
dc.date.available	2014-03-01T01:48:50Z
dc.date.issued	1999	en
dc.identifier.issn	1464-1917	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25615
dc.subject.classification	Geochemistry & Geophysics	en
dc.subject.other	CLIMATE	en
dc.subject.other	SENSITIVITY	en
dc.subject.other	SULFATE	en
dc.subject.other	BUDGET	en
dc.subject.other	SIZE	en
dc.title	Characterisation of aerosol properties and radiative forcing at an anthropogenically perturbed continental site	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	Measurements of optical, chemical and physical properties of ambient aerosol particles were obtained at a continental anthropogenically perturbed environment. For aerosol sampled at the site from January to December 1995, the mean gravimetric mass concentration for particles with diameter d(p) less than or equal to 1 mu m on 24-hr filter samples was 11.0 +/- 7.6 mu g/m(3). Ion chromatographic (IC) analysis chemically identified 50 +/- 15% of the total gravimetric mass for fine particles (d(p) less than or equal to 1 mu m). Most of the IC identified material (88 +/- 14%) consisted of NH4+ and SO42-. Thermal optical reflectance (TOR) analysis of small number of samples showed that the material not identified with IC consisted of elemental and organic carbon. To examine the implications of the measurements and effect of their variation, the mean annual direct radiative forcing (<(Delta)over bar>(F) over bar(R)) due to aerosol particles at the site was estimated by a simple model using as input measured total light scattering coefficients, hemispheric backscatter ratio and hygroscopic growth factor. For a mean annual height of the mixed layer at 800 m, an assumed single scattering albedo (omega) value of 0.85 and wavelength 550 nm,<(Delta)over bar>(F) over bar(R) as function of relative humidity (RH) ranged between -0.51 +/- 0.47 (RH = 40%) and -0.63 +/- 0.58 (RH = 80%) W/m(2). Sensitivity tests pointed to the importance of accurate quantification of omega. (C) 1999 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	PHYSICS AND CHEMISTRY OF THE EARTH PART C-SOLAR-TERRESTIAL AND PLANETARY SCIENCE	en
dc.identifier.isi	ISI:000083379300023	en
dc.identifier.volume	24	en
dc.identifier.issue	5	en
dc.identifier.spage	541	en
dc.identifier.epage	546	en