地上オゾンに対する輸送・生成・消滅の効果

Abstract

Monthly mean surface ozone mixing ratio Xob observed at Uji (DPRI) is partitioned into two components; Xtr transported from the free troposphere and Xch chemically produced or destructed in the boundary layer. Xtr is obtained from the wind speed and the ozone in the free troposphere estimated from the surface ozone. Xch is obtained from the difference between Xob and Xtr.In the daytime, Xtr increases with wind speed, while Xch shows the maximum at hourly wind speed of 1-2 m/s. Xch is positive for April-October, but is negative in other months showing the net chemical destruction in the boundary layer.Xch increases linealy with solar radiation, and is negative for the daily global solar radiation below about 8 MJ/m^2/day.In the night, monthly mean Xch is negative in all months, indicating net chemical destruction in the boundary layer.