ACID DEPOSITION AT THE SUMMIT OF MT-FUJI - OBSERVATIONS OF GASES, AEROSOLS AND PRECIPITATION IN SUMMER, 1993 AND 1994

Intensive observations of chemical species in aerosols, gases and othe r samples at the summit of Mt. Fuji and at Tarobo (at 1300m on the mou ntain'ts southern slope) was performed from July 28 to Aug. 3, 1993 an d from July 25 to 30, 1994. The most interesting observation was the a brupt increase in the sulfate concentration in aerosol collected in Ju ly, 1993 just after the typhoon (number 9306) passed the Japanese arch ipelago and the wind direction shifted from south to west. Chemical an alysis indicated this aerosol was acidic. In contrast, the summit aero sol observed in 1994 was not acidic following a less dramatic rise in sulfate content. Back trajectory analyses were used to extrapolate fro m these measurement to an inventory of polluted air over the Asian Con tinent. The concentrations of gaseous SO2 and HCl remained low during both observation periods, with some higher concentrations of NH3.