http://www.cnr.it/ontology/cnr/individuo/prodotto/ID44601

Convective transport of particulate matter in an Appennine valley: 2 . Time-variations in the columnar aerosol mass content and vertical profiles of aerosol mass concentration (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Convective transport of particulate matter in an Appennine valley: 2 . Time-variations in the columnar aerosol mass content and vertical profiles of aerosol mass concentration (Articolo in rivista) (literal)

Anno

2002-01-01T00:00:00+01:00 (literal)

Alternative label

C. Tomasi, S. Marani , V. Vitale, A. Lupi (2002)
Convective transport of particulate matter in an Appennine valley: 2 . Time-variations in the columnar aerosol mass content and vertical profiles of aerosol mass concentration
in Atmospheric research (Print)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

C. Tomasi, S. Marani , V. Vitale, A. Lupi (literal)

Pagina inizio

123 (literal)

Pagina fine

146 (literal)

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63 (literal)

Rivista

Atmospheric research (Rivista)

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24 (literal)

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pubblicazione scientifica (literal)

Note

ISI Web of Science (WOS) (literal)

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ISAC-CNR, Ministero Pubblica Istruzione, ISAC-CNR, ISAC-CNR (literal)

Titolo

Convective transport of particulate matter in an Appennine valley: 2 . Time-variations in the columnar aerosol mass content and vertical profiles of aerosol mass concentration (literal)

Abstract

Multispectral sun-photometric measurements of aerosol optical depth were performed at five stations located at different altitudes from about 500 to 2165 m a.m.s.l. in the Leo valley in the Apennines (Italy), on some clear-sky autumn days of 1981 and 1982. These measurements showed that the aerosol optical depth greatly increased during the morning at all measurement stations due to the convective transport of particulate matter induced by the local valley breezes. In order to evaluate the corresponding variations of the vertical mass loading of particulate matter, two continental and rural aerosol extinction models were determined. The first model (CR) provides the spectral series of both volume and mass aerosol extinction coefficients at nine visible and near-infrared wavelengths for 27 aerosol particle size-distribution curves of Junge-type with values of the Ångström exponent a varying between 0.15 and 1.99. The second model (called AVA) is based on linear combinations of three monomodal particle size-distribution curves determined for giving form to a nuclei mode, an accumulation mode and a coarse particle mode, respectively, whose particle number concentrations were properly modified to fit the values of a found from the spectral measurements of aerosol optical depth. Using these aerosol extinction models, estimates of the columnar aerosol mass content were obtained at the five stations, presenting values mostly ranging between 0.03 and 0.12 g m-2 at the two lower stations, 0.02 and 0.08 g m-2 at the two intermediate stations and 0.01 and 0.03 g m-2 at the high-altitude Mt. Cimone station. The corresponding hourly mean percentage variations of the vertical aerosol mass loading were found to vary between a few percents and nearly 100%, with median values ranging from 14% to 29% at the various stations. From these estimates, evaluations of the aerosol mass concentration were obtained within the four layers, mainly varying from 15 to 160 mg m-3 in the first layer, from 15 to 95 mg m-3 in the second, from 10 to 60 mg m-3 in the third and from 5 to 20 mg m-3 in the fourth. Correspondingly, the hourly mean percentage variations were found to range between -26% and +124% within the four layers, with median values gradually increasing from +4% to +20%, passing from the first to the fourth layer. (literal)

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