Measurements of aerosol optical properties in central Tokyo during summertime using cavity ring-down spectroscopy: Comparison with conventional techniques |
| |
| Authors: | Tomoki Nakayama Rie Hagino Yutaka Matsumi Yosuke Sakamoto Masahiro Kawasaki Akihiro Yamazaki Akihiro Uchiyama Rei Kudo Nobuhiro Moteki Yutaka Kondo Kenichi Tonokura |
| |
| Institution: | 1. Solar-Terrestrial Environment Laboratory and Graduate School of Science, Nagoya University, Furocho, Chikusa-ku, Nagoya 464-8601, Japan;2. Department of Molecular Engineering, Kyoto University, Kyoto 615-8510, Japan;3. Meteorological Research Institute, Japan Meteorological Agency, Tsukuba 305-0052, Japan;4. Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo 153-8904, Japan;5. Environmental Science Center, The University of Tokyo, Tokyo 113-8656, Japan;1. Department of Life Science and Graduate School of Life Science, Rikkyo (St. Paul’s ) University, Toshima-ku, Tokyo 171-8501, Japan;2. Application Laboratory, Rigaku Corporation, 3-9-12 Matsubara-cho, Akishima-shi, Tokyo 196-8666, Japan;3. Research Reactor Institute, Kyoto University, Kumatori, Osaka 590-0494, Japan;1. Meme Media Laboratory, Hokkaido University, Japan;2. Yukawa Institute for Theoretical Physics, Kyoto University, Japan;1. Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan;2. The Hakubi Center for Advanced Research, Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto 606-8302, Japan;3. Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan;4. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan;5. ISS Project Science Office, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 2-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan;6. Department of Applied Physics, University of Miyazaki, 1-1 Gakuen Kibana-dai Nishi, Miyazaki 889-2192, Japan;7. Physics Department, Kogakuin University, 2665-1, Nakano-cho, Hachioji, Tokyo 192-0015, Japan;8. The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;9. Department of Information Science, Faculty of Liberal Arts, Tohoku Gakuin University, 2-1-1 Tenjinzawa, Izumi-ku, Sendai, Miyagi 981-3193, Japan;1. Graduate School of Energy Science, Kyoto University, Yoshida Honmachi, Sakyo-ku, Kyoto 606-8501, Japan;2. Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan;3. Institute of Advanced Energy (IAE), Kyoto University, Japan |
| |
| Abstract: | A highly sensitive cavity ring-down spectrometer (CRDS) was used to monitor the aerosol extinction coefficient at 532 nm. The performance of the spectrometer was evaluated using measurements of nearly monodisperse polystyrene particles with diameters between 150 and 500 nm. By comparing the observed results with those determined using Mie theory, the accuracy of the CRDS instrument was determined to be >97%, while the upper limit for the precision of the instrument was estimated to be 0.6–3.5% (typically 2%), depending on the particle number concentration, which was in the range of 30–2300 particles cm?3. Simultaneous measurements of the extinction (bext), scattering (bsca) and absorption (babs) coefficients of ambient aerosols were performed in central Tokyo from 14 August to 2 September 2007 using the CRDS instrument, two nephelometers and a particle/soot absorption photometer (PSAP), respectively. The value of bext measured using the CRDS instrument was compared with the sum of the bsca and babs values measured with a nephelometer and a PSAP, respectively. Good agreement between the bext and bsca + babs values was obtained except for data on days when high ozone mixing ratios (>130 ppbv) were observed. During the high-O3 days, the values for bsca + babs were ～7% larger than the value for bext, possibly because the value for babs measured by the PSAP was overestimated due to interference from coexisting non-absorbing aerosols such as secondary organic aerosols. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
