http://www.cnr.it/ontology/cnr/individuo/prodotto/ID43048

Seasonality of the Air-Forest Canopy Exchange of Persistent Organic Pollutants (Articolo in rivista)

Type

Label

Seasonality of the Air-Forest Canopy Exchange of Persistent Organic Pollutants (Articolo in rivista) (literal)

Anno

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Alternative label

Nizzetto L.; Jarvis A.; Brivio P.A.; Jones K.C.; Di Guardo A. (2008)
Seasonality of the Air-Forest Canopy Exchange of Persistent Organic Pollutants
in Environmental science & technology; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
(literal)

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Pagina inizio

Pagina fine

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Rivista

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Note

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Nizzetto L., Jarvis A., Jones K.C.: Univ Lancaster, Dept Environm Sci, Lancaster LA1 4YQ, UK; Di Guardo A: Univ Insubria, Dept Chem & Environm Sci, Como, Italy; Brivio P.A.: CNR-IREA (literal)

Titolo

Seasonality of the Air-Forest Canopy Exchange of Persistent Organic Pollutants (literal)

Abstract

Forest canopies represent an extensive organic surface available for partitioning of semivolatile organic pollutants with the atmosphere. To date, the ability of forests to sequester such compounds (the so-called \"forest filter effect\") has been investigated using indirect methods that yield time integrated deposition fluxes and scenario-de pendent deposition velocities. In the present study, experimental data collected at three different alpine forest sites were used to assess the dynamics of PCB deposition fluxes (F, ng m(-2) d(-1)) during the growing season. Estimated values of F were consistent with previously reported data. Furthermore, this study showed that maximum levels of F in late spring can be a factor of 1.4-3.4 higher than their seasonal mean value. These data, in conjunction with a simple model framework that includes the main forcing parameters of air concentration, temperature, foliage structure, and biomass dynamics, are used to estimate the plant-air mass transfer coefficient (k(U), m d(-1)) and its variation with time in one of the forests. k(U) did not appear to significantly vary during the season, and its mean seasonal value ranged between 43 and 95 m d(-1) for selected compounds. The proposed framework was successfully applied to predict the variation in canopy concentration with time in the other two forests. (literal)

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