Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/217585
Share/Export:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Title

Variability of aerosol optical properties in the Western Mediterranean Basin

AuthorsPandolfi, Marco; Cusack, Michael CSIC ORCID; Alastuey, Andrés CSIC ORCID; Querol, Xavier CSIC ORCID
Issue Date2011
PublisherEuropean Geophysical Society
CitationAtmospheric Chemistry and Physics 11: 8189- 8203 (2011)
AbstractAerosol light scattering, absorption and particulate matter (PM) concentrations were measured at Montseny, a regional background site in the Western Mediterranean Basin (WMB) which is part of the European Supersite for Atmospheric Aerosol Research (EUSAAR). Off line analyses of 24 h PM filters collected with Hi-Vol instruments were performed for the determination of the main chemical components of PM. Mean scattering and hemispheric backscattering coefficients (@ 635 nm) were 26.6±23.2 Mm-1 and 4.3±2.7 Mm-1, respectively and the mean aerosol absorption coefficient (@ 637 nm) was 2.8±2.2 Mm-1. Mean values of Single Scattering Albedo (SSA) and Ångstrm exponent (a) (calculated from 450 nm to 635 nm) at MSY were 0.90±0.05 and 1.3±0.5 respectively. A clear relationship was observed between the PM1/PM10 and PM2.5/PM10 ratios as a function of the calculated Ångstr m exponents. Mass scattering cross sections (MSC) for fine mass and sulfate at 635 nm were 2.8±0.5 m2 g -1 and 11.8±2.2 m2 g-1, respectively, while the mean aerosol absorption cross section (MAC) was 10.4±2.0 m2 g-1. The variability in aerosol optical properties in the WMB were largely explained by the origin and ageing of air masses over the measurement site. The MAC values appear dependent of particles aging: similar to the expected absorption cross-section for fresh emissions under Atlantic Advection episodes and higher under aerosol pollution episodes. The analysis of the Ångstrm exponent as a function of the origin the air masses revealed that polluted winter anticyclonic conditions and summer recirculation scenarios typical of the WMB led to an increase of fine particles in the atmosphere double low line 1.5±0.1) while the aerosol optical properties under Atlantic Advection episodes and Saharan dust outbreaks were clearly dominated by coarser particles a Combining double low line 1.0±0.4). The sea breeze played an important role in transporting pollutants from the developed WMB coastlines towards inland rural areas, changing the optical properties of aerosols. Aerosol scattering and backscattering coefficients increased by around 40 % in the afternoon when the sea breeze was fully developed while the absorption coefficient increased by more than 100 % as a consequence of the increase in the equivalent black carbon concentration (EBC) observed at MSY under sea breeze circulation. © 2011 Author(s).
Publisher version (URL)http://dx.doi.org/10.5194/acp-11-8189-2011
URIhttp://hdl.handle.net/10261/217585
DOI10.5194/acp-11-8189-2011
Identifiersdoi: 10.5194/acp-11-8189-2011
issn: 1680-7316
Appears in Collections:(IDAEA) Artículos

Files in This Item:
File Description SizeFormat
acp-11-8189-2011.pdf1,86 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work

WEB OF SCIENCETM
Citations

62
checked on Nov 23, 2021

Google ScholarTM

Check

Altmetric

Dimensions


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.