Abstract

The analysis reported in thiswork has been performed to characterise PM10concentrationmeasuredin an urban background site in Lecce (Apulia region, Italy). PM10 concentration and its inorganicchemical composition have been studied using three procedures: a qualitative analysis of thecorrelation coefficients between the different species and of the crustal enrichment factor; the clusteranalysis (CA) and the principal component analysis (PCA). The results of the three procedures are ingood agreement. The five groups identified by the CA correspond to the five principal componentsobtained with the PCA and they reflect the results qualitatively inferred using the two-speciescorrelation coefficients. The CA results helped in putting in evidence a correlation between Ni, V andsulphate that was less evident in the PCA. The relative abundance of V is larger with wind fromtheNNWdirectionswherethemain industrial sites of the region are located. This suggests the presence ofanthropogenic inorganic secondary aerosol generated by a common source of V and SO2 that arelikely the industrial releases and the ship emissions. The absolute PCA (APCA) allowed thequantitative apportionment of the five components observed: crustal matter (49.5%), secondaryinorganic aerosol (24.1%), marine aerosol (6.3%), traffic (16.5%), and industrial (2.1%). ObservedPM10 concentration clearly shows a seasonal pattern, opposite to the one observed in the northernand central Italy, with average PM10 larger in the warm season (spring and summer) with respect tothe cold season as a consequence of the increase of crustal matter contribution likely due to theintrusion of African dust. These intrusions are more frequent in the warm season and have aninfluence on daily PM10 concentrations variable between 6% and 120% in this site. Correlation withmeteorological data indicates that the more intense cases of intrusions of African dust happen withwind blowing from the SW direction. Average PM10 concentration decreases of about 23% duringprecipitation. The decrease ismainly due to the decrease in crustal matter contribution and secondaryinorganic aerosol. The sum of the other three sources is almost not changing during precipitation.

Autore Pugliese

• Donateo Antonio , Cesari Daniela , Contini Daniele

Tutti gli autori

• Contini D.; Genga A.; Cesari D.; Siciliano M.; Donateo A.; Bove M.C.; Guascito M.R.

Titolo volume/Rivista

Atmospheric research

Anno di pubblicazione

2010

ISSN

0169-8095

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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