Concentration of Surface Air Ozone on the Summit of Mt. Tsukuba, Japan

Concentration of ozone in the surface air was measured on the summit of Mt. Tsukuba (36deg. 13min. N, 140deg. 06min. E, alt. 868m), Japan, during the period of Apr. 1986 to Apr. 1993. Ozone concentration was determined by UV photometry. Monthly averaged ozone concentrations ranged from 20 -> 55ppb. Seasonal variation was observed: high concentration appeared in spring and in fall. The "two-peak" variation pattern observed for ozone concentration is similar to the seasonal variation pattern of the cosmogenic 7Be concentrationin the surface air.