Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 4 2009 10.5194/acpd-9-16527-2009 http://www.atmos-chem-phys-discuss.net/9/16527/2009/ http://www.atmos-chem-phys-discuss.net/9/16527/2009/acpd-9-16527-2009.html http://www.atmos-chem-phys-discuss.net/9/16527/2009/acpd-9-16527-2009.pdf 16527 16547 2009-08-06 Impact of Chinese SO₂ emissions on submicron aerosol concentration at Mt. Tateyama, Japan K. Osada kosada@nagoya-u.jp T. Ohara I. Uno M. Kido H. Iida GSES, Nagoya University, Nagoya, Japan NIES, Tsukuba, Japan RIAM, Kyusyu University, Fukuoka, Japan Toyama Prefectural Environmental Science Research Center, Imizu, Japan Tateyama Caldera SABO Museum, Tateyama, Japan Rapid Asian economic development might engender secondary impacts of atmospheric aerosol particles over the western Pacific after conversion of gaseous pollutants such as SO₂. To elucidate changes in aerosol concentrations in leeward areas undergoing remarkable industrialization, the number-size distributions of submicron (0.3–1.0 μm) aerosols were measured at Murododaira (36.6° N, 137.6° E, 2450 m a.s.l.) on the western flank of Mount Tateyama in central Japan during January 1999–February 2009. Nighttime data obtained from 24:00 to 05:00 (local time) were used to analyze free-tropospheric aerosol concentration. Monthly average volume concentrations were calculated for months with >50% daily data coverage. Volume concentrations of submicron aerosols were high in spring to early summer and low in winter. Significant increasing trends at 5% level were found for volume concentrations during December–January and March–April. Simulated monthly SO₄^2− concentrations at Mt. 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