Miyagi University of Education, 149 Aoba, Aramaki, Aobaku, Sendai 980-0845.
Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503.
Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578.
National Institute of Polar Research, Research Organization of Information and Systems, Midori-cho 10-3, Tachikawa, Tokyo 190-8518.
National Institute of Polar Research, Research Organization of Information and Systems, Midori-cho 10-3, Tachikawa, Tokyo 190-8518.
Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578.
Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578.
National Institute of Polar Research, Research Organization of Information and Systems, Midori-cho 10-3, Tachikawa, Tokyo 190-8518.
Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science (ISAS), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210.
Balloon-borne cryogenic samplers were launched from Japanese Antarctic Station, Syowa, on December 26, 2003 and January 5, 2004. Stratospheric air samples were successfully collected at 11 different altitudes from 10 to 30 km. After air samples were transported to Japan, they were analyzed for various greenhouse gases and their isotopes. The CO_2 concentration, thus obtained, shows no significant vertical gradient above 20 km. Secular increase of CO_2 concentration was clearly observable in the mid-stratosphere over Syowa station. From the average CO_2 concentrations in 1998 and 2004, the concentration difference was calculated to be 9.7 ppm, which is almost same the tropospheric trend. The average mean age was estimated to be 5.0±0.2 years above 20 km. This value was almost the same as that estimated from the CO_2 concentration data in 1998, 4.9±0.2 years. This result implies that there is no secular change of the mean age in the Antarctic stratosphere during this period. Vertical distributions of N_2O isotopomer ratios showed different characteristics among December, January, and previous observations in January 1998, showing that the short-term and long-term effects of transport processes.
クライオジェニックサンプラーを用いた昭和基地上空における成層圏大気中の温室効果気体観測
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KJ00007136499
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概要
