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Comparison of laser-induced fluorescence and chemiluminescence measurements of NO₂ at an urban site

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. A chemiluminescence instrument equipped with a molybdenum oxide converter (Mo-CL) and a laser-induced fluorescence (LIF) instrument were...

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Published in:Atmospheric environment (1994) 2011-11, Vol.45 (34), p.6233-6240
Main Authors: Suzuki, Hiroyuki, Miyao, Yuka, Nakayama, Tomoki, Pearce, Julie K, Matsumi, Yutaka, Takahashi, Kenshi, Kita, Kazuyuki, Tonokura, Kenichi
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cited_by cdi_FETCH-LOGICAL-c440t-7f1753a4e6fc568c38ac4f0aac5e79aa6261c52e42bbf7a4624ea6de1af3deb23
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container_title Atmospheric environment (1994)
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creator Suzuki, Hiroyuki
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description 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. A chemiluminescence instrument equipped with a molybdenum oxide converter (Mo-CL) and a laser-induced fluorescence (LIF) instrument were used simultaneously for determining the ambient NO₂ concentrations. A tight linear correlation between the NO₂ concentrations determined by the LIF and Mo-CL techniques was evident except for high ozone concentration periods over 50 ppbv. During the high ozone episodes, correlation plots of the NO₂ concentrations between Mo-CL and LIF techniques indicated an overestimation of Mo-CL NO₂. To examine in detail the systematic differences between two techniques, a thermal dissociation laser-induced fluorescence (TD-LIF) instrument was employed in the summer of 2009 to measure total peroxy nitrates (ΣPNs) and total reactive nitrogen (NOz). We found that the ΣPNs concentrations correlated well with the discrepancies in NO₂ concentrations determined by the Mo-CL and LIF techniques. This result suggests that peroxy nitrate species significantly contribute to the observed interference in the Mo-CL measurements under high O₃ concentrations in our observation at the urban site in Tokyo.
doi_str_mv 10.1016/j.atmosenv.2011.07.065
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source ScienceDirect Journals
subjects Applied sciences
atmospheric chemistry
Atmospheric pollution
Chemiluminescence
Correlation
dissociation
Exact sciences and technology
Fluorescence
Molybdenum
Nitrates
nitrogen
Nitrogen dioxide
Ozone
Pollution
Summer
title Comparison of laser-induced fluorescence and chemiluminescence measurements of NO₂ at an urban site
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