HR: 17:30h
AN: C44A-07    [Abstracts]
TI: Variation of Biological Activity on a Himalayan Glacier Recovered from a Shallow Ice Core
AU: * Takeuchi, N
EM: takeuchi@chikyu.ac.jp
AF: Research Institute for Humanity and Nature, 335 Takashimacho Kamigyo-ku, Kyoto, 602-0878 Japan
AU: Fujita, K
EM: cozy@ihas.ihas.nagoya-u.ac.jp
AF: Nagoya University, Furocho, Chikusa-ku, Nagoya, 464-8601 Japan
AU: Nakazawa, F
EM: nakazawa@ihas.nagoya-u.ac.jp
AF: Nagoya University, Furocho, Chikusa-ku, Nagoya, 464-8601 Japan
AU: Matoba, S
EM: matoba.sumito@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506 Japan
AU: Nakawo, M
EM: nakawo@chikyu.ac.jp
AF: Research Institute for Humanity and Nature, 335 Takashimacho Kamigyo-ku, Kyoto, 602-0878 Japan
AU: Rana, B
EM: takeuchi@chikyu.ac.jp
AF: The Department of Hydrology and Meteorology, Ministru of Science and Technology, Kathumandu, 000 Nepal
AB: There is a diverse biological community on the snow and ice surface of glaciers. Recent change of glaciers reported in many parts in the world may affect the biological community on the glaciers. Temporal variation of biological activity on a Himalayan glacier was recovered from a 15 m deep ice core drilled in 1998. The dating showed that the core covers 37 years (1962-98) including the two hiatuses of annual layer. Microscopy revealed that the core contained filamentous cyanobacteria growing on the glacial surface. They discontinuously appeared in mid 1960s, mid 1970s, and 1990s. In particular, the biomass in 1990s is significantly larger than before, indicating their significant bloom in the period. The annual variation of biomass was compared with the variations of dust flux, mass balance, stable isotope, and chemical composition. The comparison suggests that the bloom of the cyanobacteria may be attributed to the combination of climate warming and eutrophication on the glacial surface in 1990s.
DE: 9320 Asia
DE: 6020 Ice
DE: 1863 Snow and ice (1827)
DE: 1615 Biogeochemical processes (4805)
DE: 0840 Evaluation and assessment
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting