Development of a methodology for dry deposition monitoring in East Asia

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  • 東アジアにおける乾性沈着モニタリング手法の開発
  • ヒガシアジア ニ オケル カンセイ チンチャク モニタリング シュホウ ノ カイハツ

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Abstract

In order to establish methodologies for dry deposition monitoring in East Asia, studies on dry deposition direct measurement and parametarization of depositionsion velocity were carried out. As preliminary analyses, sulfur dry deposition in Japan and East Asia were estimated by using the parametarizations developed in North Amerika and Europe. Direct measurement studies were done in a red pine forest (Nagano, Japan) and a teak forest (Lampang, Thailand) to evaluate aplicability of the parametarizations. In the Nagano field, the Bowen ratio method was used to measure SO2 dry deposition. Measured deposition velocity was 0.9 cm/s during the time, from 12:00 to 14:00, in autumn. In the Thai field, the aerodynamic gradient method was used to measure O3 and SO2 dry deposition. Higher deposition velocities of O3 and SO2 in the wet season were mainly caused by non-stomatal uptake of wet canopy due to a lot of wet days, especially in the case of SO2. Much higher daytime deposition velocities in the wet season were additionally caused by stomatal uptake of leafy trees. In dry season, the O3 surface resistance was found to be affected by aerodynamic process rather than stomatal process. Finally recent field studies on dry deposition in East Asia (from 2002 to 2007) were reviewed and then a parameterization of deposition velocity was updated based on the findings of the review.

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