Modelling Critical Levels of Ozone for the Forested Area of Austria - Modifications of the AOT40 Concept

Oulu

2005

S. 52-66

Bandaufführung

125409

Three approaches were outlined and maps were generated to assess the impact of ozone on Norway spruce forests covering the entire area of Austria. The 1st approach modifies the AOT40 (=accumulated exposure over a thershold of 40ppb, 10,000 ppb.h for 6 monts of one growing season calculated for 24th day) due to the assumption that foests have adapted to the pre-industrial levels of ozone, which increase with altitude (AOT). The 2nd approach modifies the AOT40 according to the ozone concentration in the sub-stomata cavity. This approach is based on such factors as light intensity and water vapour saturation deficit, which affect stomatal uptake (AOTsto).