検索画面に戻る Go Research

	(461Kb)

[A-1.3.2 Studies on Chemical Reactions and Heterogeneous Processes related to Stratospheric Ozone Depletion]

[Contact Person]

Takashi Imamura
Senior Researcher, Atmospheric Environment Division
National Institute for Environmental Studies
Environment Agency
Onogawa, Tsukuba, Ibaraki 305, Japan
Phone +81-298-50-2406, Fax +81-298-51-4732
E-mail imamura@nies.go.jp

[Total Budget for FY1993-FY1995]

34,646,000 Yen (FY1995; 12,161,000 Yen)

[Abstract]

　To clarify the effects of the stratospheric sulfate aerosols on the ozone layer, radical reactions related to formation of sulfuric acid, radical-radical reactions including CIO and BrO, uptake coefficients of OH radical to aqueous solutions are examined using photoionization mass spectrometer, photochemical chamber and laser induced fluorescence technique. Simulations of the effects of volcanic aerosols on the ozone layer were also carried out using two types of one dimensional models, an ordinary one dimensional model with heterogeneous reactions and a full interactive one-dimensional model without heterogeneous reactions. By these studies, following major findings were obtained. A radical reaction HS+0 → H+SO is important for formation of sulfuric acid. Some specific behavior of OH on the surface, acidity and low temperature seam to be important for uptaking process of OH to aqueous solutions. In the case of the volcanic eruptions like Mt. Pinatubo, ozone reduction due to heterogeneous reactions and due to radiative-chemical coupled processes are 8%(at 20 km) and 2-3% (at 30 km), respectively.

[Key Words]

Heterogeneous Reactions, Radical Reactions, sulfuric Aerosols, HS Radicals, OH Radicals, uptake coefficients, One dimensional Models