Document Detail


Saharan dust episodes in Italy: influence on PM10 daily limit value (DLV) exceedances and the related synoptic.
MedLine Citation:
PMID:  19724826     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The relevance of dust outbreaks from the Sahara into Italy was evaluated for the period from 2001 to 2007. To this end, days affected by Saharan dust were recognized at four PM(10) background stations belonging to the Regional Agencies for Environmental Protection (ARPA) monitoring networks (one working in the 2005-2007 period only). The analysis included computation of back trajectories, complemented with satellite images and meteorological charts. Results from other models are also collected for comparison. Saharan Dust contribution to PM(10) was calculated referring to a method developed for Iberian monitoring networks. PM(10) exceeding the daily limit value (DLV) of the European Union air quality standard were reviewed also. The provenience of air masses yielding the exceedances was also recognized, allowing to distinguish the Atlantic-European episodes from the (Atlantic)-Saharan ones. The European episodes are due to anthropogenic pollution that affected mainly northern Italy in winter; instead, the Saharan ones are due to dust outbreaks that affected mainly southern Italy in summer. Central Italy is characterised by a transitional situation that is experienced from north to south. A number of dust affected days with DLV exceedance (from 4 to 108 at the considered stations) were identified and grouped into 55 Saharan dust episodes. Analysis showed that DLV exceedances due to Saharan dust advection vanish at all stations when dust contributions are subtracted. A synoptic analysis based on the meteorological charts was carried out allowing a view of Saharan dust transport into Italy for each meteorological season. Notwithstanding that summer is the season most influenced by Saharan episodes at all of the stations, the analysis showed a low-high system of anomalies on the geopotential height distribution causing south-southwesterly flow carrying dust into Italy during the other seasons.
Authors:
Luca Matassoni; Giovanni Pratesi; Damiano Centioli; Fabio Cadoni; Piergiorgio Malesani; Anna Maria Caricchia; Alessandro Di Menno di Bucchianico
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-07-08
Journal Detail:
Title:  Journal of environmental monitoring : JEM     Volume:  11     ISSN:  1464-0333     ISO Abbreviation:  -     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-09-02     Completed Date:  2009-10-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100968688     Medline TA:  J Environ Monit     Country:  England    
Other Details:
Languages:  eng     Pagination:  1586-94     Citation Subset:  IM    
Affiliation:
Dipartimento di Scienze della Terra, Università di Firenze, 50121 Firenze, Italy. luca.matassoni@unifi.it
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MeSH Terms
Descriptor/Qualifier:
Africa, Northern
Air Pollutants / analysis*
Dust / analysis*
Environmental Monitoring / methods*
Italy
Particulate Matter / analysis*
Time Factors
Chemical
Reg. No./Substance:
0/Air Pollutants; 0/Dust; 0/Particulate Matter

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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