富士山頂のエアロゾル, ガス, 霧および降水の化学成分 -1993年夏の観測について, 1994年夏の観測と比較して- Chemical Species in Aerosol, Gases, Precipitation and Fog at the Summit of Mt. Fuji -Observations in Summer, 1994 Compared with Summer 1993-
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Intensive observations on chemical species in aerosol, gases, fog and precipitation at the summit of Mt. Fuji and at Tarobo (at 1,300 m above sea level on the mountain's southern slope) was performed from July 25 to 30, 1994, and compared with those from July 28 to August 3, 1993. In the 1993 campaign, the most interesting phenomenon was the abrupt increase in the nss-sulfate concentration in aerosol which was observed just after the typhoon (number 9306) passed the Japanese archipelago and the wind direction shifted from south to west. Chemical analysis indicated this aerosols was partly acidic. In the 1994 campaign, however, the summit aerosol was not acidic following a less dramatic rise in sulfate content. Size distribution study of chemical species in these aerosol indicated that sulfate and ammonium ions in the aerosol obtained in the 1993 campaign showed unimodal pattern, while those obtained in 1994 showed bimodal pattern. Back trajectory analyses were used to extrapolate the movement of air mass which arrived at the summit. In the 1993 campaign, polluted air over the Asian Continent was suspected to be transported long way from the west, but in the 1994 campaign, most of the polluted air was supposed to come from the Kanto area, Japan. Additional information from, <SUP>7</SUP>Be study in 1994 aerosol suggests a transportation of upper air to the summit at the same time.
- Earozoru Kenkyu
Earozoru Kenkyu 12(4), 311-319, 1997-12-20
Japan Association of Aerosol Science and Technology