Seasonality of air-forest canopy exchange of persistent organic pollutants

Nizzetto, Luca and Jarvis, Andrew and Brivio, Pietro A. and Jones, Kevin C. and Di Guardo, Antonio (2008) Seasonality of air-forest canopy exchange of persistent organic pollutants. Environmental Science and Technology, 42 (23). pp. 8778-8783. ISSN 0013-936X

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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-dependent 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 (kU, m d−1) and its variation with time in one of the forests. kU 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.

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Journal Article
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Environmental Science and Technology
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12 Nov 2009 15:34
Last Modified:
18 Sep 2023 00:13