HR: 0800h
AN: C51B-1042    [Abstracts]
TI: Isotopic composition of atmospheric water vapor observed at Taiga forest in Eastern Siberia
AU: * Sugimoto, A
EM: sugimoto@star.dti2.ne.jp
AF: Graduate School of Environmental Earth Science, Hokkaido University, Kita 10, Nishi 5, Sapporo, 060-0810 Japan
AU: Naito, D
AF: Center for Ecological Research, Kyoto University, Kamitanakami Hiranocho, Otsu, 520-2113 Japan
AU: Maximov, T C
EM: t.c.maximov@ibpc.ysn.ru
AF: Institute for Biological Problems of Cryolithozone, 41 Lenin Ave, Yakutsk, 678891 Russian Federation
AU: Hiyama, T
EM: hiyama@ihas.nagoya-u.ac.jp
AF: Hydrospheric Atmospheric Research Center, Nagoya University, Furocho, Chikusaku, Nagoya, 464-8601 Japan
AU: Ohata, T
EM: ohata@pop.lowtem.hokudai.ac.jp
AF: Institute of Observational Research for Global Change, Showa-machi, Kanazawa-ku, Yokohama, 236-0001 Japan
AB: Recycling of water is important for the summer precipitation process in the inland region such as Eastern Siberia. The isotopic composition of summer precipitation at Eastern Siberia is much higher than that expected from its latitude and distance from the ocean. The authors clarified the sources of water for plants and water movement in the soil at Taiga forest using stable isotopes of water. The isotopic composition of the atmospheric water vapor was obtained in tower and aircraft observations. Aircraft and tower samplings were carried out in the field campaign during intensive observation period in 2000 at Yakutsk. Sampling using tethered balloon was also made several times during summer in 1998 to 2000. The isotopic composition of water vapor changed seasonally. The d18O of water vapor increased after leaf opening of the forest and the pattern of its variation after leaf opening was similar to that of precipitation. Vertical profile of water vapor d18O also changed before and after leaf opening. These results suggest importance of transpired water vapor through forest vegetation.
DE: 3322 Land/atmosphere interactions
DE: 1854 Precipitation (3354)
DE: 1866 Soil moisture
DE: 1040 Isotopic composition/chemistry
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting