THE STATE OF MINOR CONSTITUENTS IN THE ANTARCTIC SNOW AND ICE

元データ 国立極地研究所

概要

A preliminary study of the distribution and the state of minor chemical constituents in the test cores from Mizuho Station was made. Samples from 1m, 5m, 15m, 20m, 25m, and 90m depths were used. The melt waters of these samples were filtered through a 0.4μm Nucleopore filter. The major constituents (Cl, NO_3,SO_4,Na, K, NH_4), formic acid and methanesulfonic acid were determined by liquid chromatography. Total and free Cu and Zn were determined by liquid chromatography with and without oxidative chemical digestion treatment. The difference between them gives organic Cu and Zn. The results are summarized as follow : 1) Formic acid, methanesulfonic acid and organic Cu and Zn were found down to 90m depth (about 1300 y b. p.) indicating the stability of these organic substances in the glacier ice condition. The proportion of organic Cu and Zn against the total amounts were significant, as was found at S25 near Syowa Station. 2) At 15-20m depth (about 200 y b. p.), most constituents showed high levels, suggesting the occurrence of some unusual event. 3) The Cl/Na ratio generally shows a value close to that of sea salt, except for 20m and 90m depth. This trend is quite different from that of methanesulfonic acid which keeps a low level in the upper 300m and increases toward 1300m. Methanesulfonic acid is reported to originate from dimethylsulfide, which is produced by planktonic activity in sea water, and to show high level in the marine atmosphere over the Southern Ocean. These facts suggest different transportation mechanisms of these substances.

著者

Watanabe Okitsugu National Institute of Polar Research, Research Organization of Information and Systems
Watanabe Okitsugu National Institute Of Polar Research
Nishio F Hokkaido University Of Education Kushiro Branch
Nishio Fumihiko National Institute Of Polar Research
Kanamori Satoru Water Research Institute, Nagoya University
Kanamori Nobuko Water Research Institute, Nagoya University
Nishikawa Masataka National Institute for Environmental Studies
Kanamori Nobuko Atmospheric And Hydrospheric Research Institute Nagoya University
Kanamori Satoru Water Research Institute Nagoya University
Kanamori Nobuko National Institute Of Polar Research
Kanamori Satoru National Institute of Polar Research
西尾 文彦 Hokkaido University Of Education Kushiro Branch
Nishio Fumihiko Hokkaido University Of Education Kushiro Branch
Shinbori K Hokkaido Univ. Sapporo
Nishikawa Masataka National Institute For Environment Studies
Kanamori Nobuko Water Research Institute Nagoya Univerisity

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