Showing papers by "Yutaka Matsumi published in 2009"
TL;DR: Optical properties of iodine-containing aerosols that were produced by ultraviolet photo-irradiation of a mixture gas of CH 2 I 2 and O 3 with dry air diluent have been measured using a nephelometer, a particle soot absorption photometer and a cavity ring-down spectrometer as mentioned in this paper.
Abstract: Optical properties of iodine-containing aerosols that were produced by ultraviolet photoirradiation of a mixture gas of CH 2 I 2 and O 3 with dry air diluent have been measured using a nephelometer, a particle soot absorption photometer and a cavity ring-down spectrometer. Single scattering albedo of iodine aerosols was determined to be 0.96 ± 0.01 at around 530 nm. Chemical compositions of the aerosols associated with particle size in the range of 0.2-1 μm was measured using a laser-ionization single-particle aerosol mass spectrometer. Positive and negative ion signals of iodine and iodine oxides, IO n (n = 0-4), I 2 O n (n = 0-6), and I 3 O n (n = 0-1), carbon-containing compounds and HOI were detected.
6 citations
TL;DR: In this paper, an observation was conducted at Tsukuba in Japan in the spring of 2005 in order to investigate springtime transport of particles from the continent to the Pacific Ocean using a single-particle time-offlight mass spectrometer.
Abstract: Internally mixed states of submicron particles during transport from the Asian continent to the Pacific Ocean were analyzed using a single-particle time-offlight mass spectrometer. The observation was conducted at Tsukuba in Japan in the spring of 2005 in order to investigate springtime transport of particles from the continent. The sum of ion intensities of sulfate (HSO₄?) detected in particles originating from the continental air masses counted for 75% of that in all particles during the observation. By analyzing correlations among compounds, origins and internally mixed states of compounds were estimated. It was found that nitrate was mixed with sulfate-rich particles as the air mass approached Japan. It was confirmed that Asian mineral dust particles played significant roles for transport of continental sulfate to Japan. As a result of analysis on internal mixing of chlorine and nitrate, it was implied that the chlorine loss in fine sea salt particles had already proceeded at Tsukuba. It was characteristic that fluoride ions were significantly detected, coal combustion in the Asian Continent can be an important source of fluorides detected in Japan through the westward transportation of fine particles including fluorides.
4 citations
Journal Article•
TL;DR: A Comment on the Letter by P. Zhang et al. as discussed by the authors, [Phys. Rev. Lett. 100, 103001 (2008), offers a Reply.
Abstract: A Comment on the Letter by P. Zhang et al., [Phys. Rev. Lett. 100, 103001 (2008)]. The authors of the Letter offer a Reply.
1 citations