Interaction between climate change, air pollution and related impacts

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This report contains the discussions and recommendations from a workshop held in Copenhagen 28-29 August 2008, where climate scientists and air pollution scientist from the Nordic countries were gathered to discuss the interaction between climate change, air pollution and related impacts.



Global change and plant ozone uptake: Impact of elevated CO2 and meteorology

Tropospheric ozone is probably the most important gaseous pollutant for effects on vegetation on a regional-global scale. It is also important for health effects and as a greenhouse gas. Global change involves several potential changes that may strongly influence ozone exposure. There are rising trends for background ozone, also in the Nordic region. Ozone uptake by vegetation is strongly modified by air and soil humidity, CO2 concentration and temperature. A warmer, humid climate in combination with a longer growing season and a higher ozone background would enhance ozone uptake by vegetation, while dryer conditions and elevated CO2 tend to reduce ozone uptake. Since ozone effects on plant are closely related to ozone uptake, risk assessment for ground-level ozone is very sensitive to the local, specific pattern of environmental change. In the Nordic climate an increasing future potential for ozone effects seems to be rather likely although uncertainties are large in this assessment.


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