Ground-based measurement of strato–mesospheric CO by a FTIR spectrometer over Poker Flat,Alaska |
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| Institution: | 1. Global Environmental Division, National Institute of Information and Telecommunications Technology (NICT), 4-2-1, Nukui-Kitamachi, Koganei, Tokyo 184-8795, Japan;2. Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan;3. Center for International Cooperation, Ocean Research Institute, The University of Tokyo Minamidai, Nakano-ku, Tokyo 164-8639, Japan;4. Department of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia;5. National Institute of Polar Research, Kaga 1-chome, Itabashi-ku, Tokyo 173-8515, Japan |
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| Abstract: | Upper atmospheric CO above 24 km has been observed over Poker Flat (147°W, 65°N, altitude 0.61 km), Alaska using ground-based solar absorption infrared spectroscopy. This is the first reported detection of stratospheric–mesospheric CO using this method from the ground. The results clearly indicate that there is a seasonal variation of the CO profile with enhanced abundances in spring while remaining low from May onwards.The Poker Flat Research Range is one of the many measurement sites that constitute the Network for the Detection of Stratospheric Change (NDSC). The method used in this work, estimating the CO partial column abundances above the middle stratosphere, can be applied to spectra observed using FTIR spectrometry at many other NDSC sites. This suggests the availability of this established technique as a new method for CO measurements in the upper atmosphere. |
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