miyake_2005.htm
Bulletin of Glaciological Research 22 (2005)
81-87
©Japanese Society of Snow and Ice
Concentrations, deposition rates and source
variations of n-alkanes in Sofiyskiy
Glacier, Russian Altai Mountains
Takayuki MIYAKE1, Fumio NAKAZAWA2, Mika KOHNO3, Jun UETAKE4, Keisuke SUZUKI5,
Takao KAMEDA6, Yoshiyuki FUJII3, 7, Masayoshi NAKAWO1 and Keiichi OHTA8
1 Research Institute for Humanity and Nature,
335 Takashima-cho, Marutamachi-dori Kawaramachi
nishi-iru, Kamigyo-ku, Kyoto
602-0878, Japan, E-mail: tmiyake@chikyu.ac.jp
2 Graduate School of Science, Nagoya University,
Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
3 National Institute of Polar Research, 1-9-10,
Kaga, Itabashi-ku, Tokyo 173-8515, Japan
4 Faculty of Bioscience and Biotechnology,
Tokyo Institute of Technology, 2-12-1, Ookayama,
Meguro-ku, Tokyo 152-8551, Japan
5 Faculty of Science, Shinshu University,
3-1-1, Asahi, Matsumoto, Nagano 390-8621,
Japan
6 Faculty of Engineering, Kitami Institute
of Technology, 165 Koen-cho, Kitami, Hokkaido
090-8507, Japan
7 School of Multidisciplinary Sciences, The
Graduate University for Advanced Studies,
Shonan Village, Hayama, Kanagawa 240
-0193, Japan
8 School of Environmental Science, The University
of Shiga Prefecture, 2500 Hassaka-cho, Hikone,
Shiga 522-8533, Japan
Abstract
Snow and ice samples collected from a snow
pit and underlying ice layers in Sofiyskiy
Glacier, Russian Altai Mountains, were analyzed
for n-alkanes by gas chromatography. The total
concentrations of n-alkanes (T-HCs) widely ranged from 0.67
to 9.86 ng g-1 in the samples. Annual deposition fluxes
of n-alkanes showed a seasonal variation with
higher levels during spring than autumn.
The values of carbon preference index (CPI)
of n-alkanes ranged from 0.95 to 3.35, which
were similar to those reported for snow samples
in Himalaya and urban aerosols. The higher
values among them were close to those reported
of n-alkanes in loess particles, which were of
plant wax origin. Both the 3.00-7.57m and
the 12.14-16.80m layers had higher concentrations
and annual deposition fluxes of non-WaxCn, suggesting that the relative contribution
of anthropogenic n-alkanes, for example, fossilfuel combustion
products, to Sofiyskiy Glacier would increase
in recent years. The WaxCn representing a portion of n-alkanes derived from plant waxes in T-HCs
widely ranged from 7.3 to 65.5% in these
samples. It is evident that n-alkanes of plant waxes could contribute
less than 50% to T-HCs in most samples at
this glacier.
