HR: 0800h
AN: A21D-0901    [Abstracts]
TI: Foreign-Gas Pressure Broadening Measurement of the Carbon Dioxide (3 0⁰ 1)_III← (0 0 0) Band using Continuous-Wave Cavity Ring-Down Spectroscopy
AU: * Morino, I
EM: morino@nies.go.jp
AF: National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, 305-8506 Japan
AU: Suto, H
EM: suto.hiroshi@nies.go.jp
AF: National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, 305-8506 Japan
AU: Inoue, G
EM: inouegen@nies.go.jp
AF: National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, 305-8506 Japan
AU: Fukuda, H
A21D-0901 AF: Graduate School of Global Environmental Studies, and Department of Molecular Engineering, Kyoto University, Kyoto Daigaku Katsura, Nishikyo ku, Kyoto, 615-8510 Japan
AU: Hashimoto, S
EM: hashimoto@moleng.kyoto-u.ac.jp
AF: Graduate School of Global Environmental Studies, and Department of Molecular Engineering, Kyoto University, Kyoto Daigaku Katsura, Nishikyo ku, Kyoto, 615-8510 Japan
AU: Kawasaki, M
EM: kawasaki@moleng.kyoto-u.ac.jp
AF: Graduate School of Global Environmental Studies, and Department of Molecular Engineering, Kyoto University, Kyoto Daigaku Katsura, Nishikyo ku, Kyoto, 615-8510 Japan
AB: Precise line parameters are needed for quantitative spectroscopic remote sensing, especially for global satellite and ground-based measurements of the concentration, distribution, trend, and physiochemical processes of molecules in the Earth's atmospheres. Carbon dioxide is an important trace constituent of the Earth's atmosphere and is considered a potent greenhouse gas. Line parameters measurement and evaluation of CO₂ in the 1600 nm region are paid a great deal of attention, because two global satellite observation projects (GOSAT and OCO) plan to observe this region. In the present study, foreign-gas pressure broadening for the (3 0⁰ 1) _III ← (0 0 0) band of CO₂ in the 1600 nm region was measured with continuous wave cavity ring-down spectroscopy within the temperature range 263-326 K. The measured absorption profiles were analyzed with Voigt functions. Foreign-gas pressure broadening coefficients and their temperature dependence were determined for a variety of foreign gases: N₂, O₂, and rare-gasses. The air broadening coefficients were estimated by using the relation: γ (air) = 0.79 γ (N₂) + 0.21γ (O₂). Furthermore, the temperature dependence coefficients of the air were estimated with a similar relation. Their values were compared with the HITRAN database.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005