Objective
To study the exchange processes of NOx and O3 between the atmosphere and forest and reduce the uncertainty in estimates of the exchange rates.
Ozone (O3) and nitrogen oxides (NOx) are key elements in tropospheric chemistry and are associated with many
environmental issues. Terrestrial ecosystems, represent a major sink by dry deposition for tropospheric O3.
Other processes are more important for NOx (NO + NO2) but its atmospheric deposition contributes to
acidification and eutrophication. Knowledge on exchange processes of these gases is very limited.
Measurements carried out recently have shown that current estimates of dry deposition fluxes of NOx may differ
significantly from the true fluxes. To define optimal emission reduction strategies to limit environmental effects
a better knowledge of these processes is required.
The impact of the NOX emissions on regional oxidant production will be assessed. Specific objectives are to:
1) Measure fluxes of O3 and NOx above and below the forest crown and establish the relation between
these fluxes and emissions of NO from the forest floor.
2) Assess the influence of biogenic emissions of NO and hydrocarbons on the deposition of O3 and
improve estimates of the dry deposition velocity of O3.
3) Study the climatology of NOx exchange to coniferous forest from long-time observations.
4) Study the relation between forest floor emissions and the input of nitrogen from the atmosphere.
5) Estimate the emission of NOx oxides from forests in Europe and assess the effect of these emissions
on regional O3 production by model calculations.
In order to meet these objectives measurements of fluxes of NOx and O3 will be made at different forest sites
in the Netherlands, Denmark and Great Britain.
The sites will differ in forest type, nitrogen load, soil nutrient status and stand architecture. Micro
meteorological methods will be used to measure the flux whereas enclosures will be used to measure exchange
between the soil and air. The results of a, necessarily, limited number of measurements will be interpreted
using a comprehensive canopy exchange model. This model includes detailed descriptions of canopy exchange
processes, chemical reactions, soil exchange and turbulence above and below the canopy. Using parameterized
results of the experimental work the impact of NOx emissions by biogenic sources on regional O3 formation
(especially in rural areas) will be investigated using an existing regional transport model. A large scale model
will be used to the assess influence of biogenic NOx emissions across Europe.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques.
- natural scienceschemical sciencesorganic chemistryhydrocarbons
- natural sciencesbiological sciencesecologyecosystems
- natural sciencesearth and related environmental sciencesatmospheric sciencesclimatology
You need to log in or register to use this function
Call for proposal
Data not availableFunding Scheme
CSC - Cost-sharing contractsCoordinator
7300AH APELDOORN
Netherlands