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Showing papers by "Yutaka Matsumi published in 2011"


Journal ArticleDOI
TL;DR: In this article, the authors applied mid-IR laser spectroscopy to differentiate between anthropogenic and biogenic CO 2 sources in urban air in Nagoya, Japan, and found that the relative contribution of CO2 sources in the city of Nagoya was roughly 0.42, 0.33 and 0.25.

32 citations


Journal ArticleDOI
TL;DR: In situ measurements of nitrogen dioxide (NO2) concentrations were conducted at an urban site in Tokyo (35°71′N, 139°76′E), Japan during the summers of 2007-2009.

18 citations


Journal ArticleDOI
TL;DR: In this article, the relative signal peak area of various target species in the LISPA-MS spectra was calculated as the ion-signal fraction of the species relative to the total signal peak areas summed over all the ion peaks in each spectrum.
Abstract: Particle mass spectrometers of two types—a time-of-flight aerosol mass spectrometer (AMS) of Aerodyne Research Inc. and a laser desorption/ionization single particle aerosol mass spectrometer (LISPA-MS) developed at Nagoya University—were deployed to characterize aerosol particles in the Tokyo metropolitan area during the summer of 2008. Based on the ensemble measurements by AMS, equivalent mass concentration of organic aerosol, traced by mass-to-charge ratio (m/z) 44, showed a closer correlation with particulate nitrate and gas-phase odd oxygen, [O 3 +NO 2 ], whereas equivalent mass concentration of organic aerosol, traced by m/z 57, did not. On a particle-by-particle basis, the relative signal peak area of various target species in the LISPA-MS spectra, which was calculated as the ion-signal fraction of the species relative to the total signal peak area summed over all the ion peaks in each spectrum, was used as a measure of the relative amount of the species. A rough qualitative agreement was obtained ...

13 citations


Journal ArticleDOI
TL;DR: Nanosecond laser ablation and subsequent ion formation processes of submicron aerosol particles containing multicomponent ammonium and sodium salts relevant to atmospheric aerosols were studied in this article.
Abstract: Nanosecond laser ablation and subsequent ion formation processes of submicron aerosol particles containing multicomponent ammonium and sodium salts relevant to atmospheric aerosols were studied usi...

1 citations