HR: 0800h
AN: B31A-0194    [Abstracts]
TI: Cryobiological ice core analyses in Altai Mountains, Russia
AU: * uetake, j
EM: jueake@bio.titech.ac.jp
AF: Tokyo Institute of Technology, 2-12-1 Ookayama Meguro, Tokyo, 152-8551 Japan
AU: Kohshima, S
EM: Kohshima@bio.titech.ac.jp
AF: Tokyo Institute of Technology, 2-12-1 Ookayama Meguro, Tokyo, 152-8551 Japan
AU: Nakazawa, F
EM: nakazawa@ihas.nagoya-u.ac.jp
AF: Nagoya University, Furou-chou chikusa-ku, Nagoya, 464-8601 Japan
AU: Kohno, M
EM: mkohno@awi-bremerhaven.de
AF: National Institute of Polar Research, 1-9-10 Kaga Itabashi-ku, Tokyo, 173-8515 Japan
AU: Kameda, T
EM: kameda@mail.kitami-it.ac.jp
AF: Kitami Institute of Technology, 165,Koen-cho Kitami , Hokkaido, 090-8507 Japan
AU: Suzuki, K
EM: kei@shinshu-u.ac.jp
AF: Shinshu University, 3-1-1 Asahi, Matumoto, 390-8621 Japan
AU: Fujita, K
EM: cozy@ihas.nagoya-u.ac.jp
AF: Nagoya University, Furou-chou chikusa-ku, Nagoya, 464-8601 Japan
AU: Takeuchi, N
EM: takeuchi@chikyu.ac.jp
AF: Research Institute for Humanity and Nature, 335 Takashimacho Kamigyo-ku, Kyoto, 602-0878 Japan
AU: Aizen, V
EM: aizen@uidaho.edu
AF: University of Idaho, 83844, ID, 443025 United States
AU: Alkhipov, S
EM: arkhipov@gol.ru
AF: Institute of Geography,Russian Academy of Science , Staromonetniy lane 29, Moscow, 109017 Russian Federation
AU: Nikitin, S A
EM: santvp@ic.tsu.ru
AF: Tomsk state University, 36 Lenina St., Tomsk, 634050 Russian Federation
AB: Microorganism in two shallow ice cores from the Sofiskiy Glacier (25.1m in length, taken at 3,435 m a.s.l.. in Jul, 2001) and the Belukha Glacier (20.94m in length, taken at 4,110m a.s.l. in Jul, 2001), Altai range of Russia, were examined for potential use in ice core analyses of this area. These ice cores and pit samples collected at the coring sits contained 6 types of unicellular green algal cells including 2 species of snow algae (Mesotenium.sp­›Trochiscia.sp), one species of unicellular cyanobacteria, 2 species of snow fungiœ"Chionaster nivalis­›Chionaster bicornisœcand unidentified bacteria. Vertical profiles of these microorganisms and that of Delta 18O in the snow pits (4.5m depth in Sofiskiy Glacier and 2.42m depth in Belukha Glacier) indicated their growth in the surface snow during the melting season. Biomass and species diversity of these microorganisms in the surface snow decreased with altitude, probably due to the colder condition. Biomass and species diversity in the ice cores were smaller than those in pit samples, suggesting the effects of washout and/or cell decomposition after deposition. Especially, fungus cells were very rare in the ice cores probably due to heavy cell decomposition. In both ice cores, however, seasonal cycles were still found for the snow algal biomass, though Delta 18O failed to show any clear seasonal variation, particularly at deeper part, probably due to heavy melt-water percolation. Supposing that the layers with almost no snow algae were the winter layers without melt water essential to algal growth, we estimated that Sofiskiy ice core and Belukha ice core contained about 15 and 10 annual layers, respectively. Snow algae in the ice core would be accurate boundary markers of annual layers in the ice cores of this region. Relationship between the snow algae in each annual layers and the meteorological data at the nearest meteorological station will also be discussed.
DE: 1827 Glaciology (1863)
DE: 1863 Snow and ice (1827)
DE: 0315 Biosphere/atmosphere interactions
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting