Modelling ozone fluxes to forests for risk assessment: status and prospects

Publication Type:

Journal Paper (published)

Source:

Annals of Forest Science, Volume 66, p.401 (2009)

URL:

www.afs-journal.org

Keywords:

ozone; risk assessment /stomatal flux /modelling /

Abstract:

• Risk assessment of ozone effects on forests is gradually moving from concentration-based exposure
metrics to a more complicated approach that requires modelling of ozone fluxes to trees.
• This study reviews the status of the DO3 SE stomatal flux model employed within the Convention
on Long-range Transboundary Air Pollution, describing a range of applications and identifying ma-
forest monitoring jor research needs, especially in the context of support that could be provided by the International
Co-operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests.
• The most urgent development need for DO3 SE is the modelling of the soil moisture status and its
effect on stomatal conductance. Furthermore, the data related to the physical characteristics and the
seasonal dynamics of physiological activity of vegetation continue to pose problems.
• There is a clear need for more extensive validation of models and risk estimates using more rigorous
statistical procedures and comparisons with flux networks and satellites.
• The current large-scale forest monitoring activities provide only limited possibilities for flux mod-
elling, but could be enhanced by introducing a new monitoring strategy outlined here.