Distribution of chemical elements in the snow at the site S25 in Antarctica

元データ 国立極地研究所

概要

The firn block samples, being 50cm deep and covering nearly one-year formation, were taken at the site S25 on Antarctic ice sheet near Syowa Station. The vertical distribution of Cl, Na, and SO_4 showed high and nearly constant level in the upper 37.5cm (766 ppb, 425 ppb, and 119 ppb, respectively) which accumulated within the period from the autumn of 1985 (based on the distribution of major elements) to early summer of 1986 when high influence of marine air is expected. On the other hand, very low concentration levels of these species (219 ppb, 117 ppb, and 64 ppb, respectively), but with high SO_4/Na ratio, were found in the lower 12.5cm layer which accumulated in the late summer of 1985 when concentration of SO_4 aerosols is high. NO_3 showed several peaks in the upper 37.5cm and K and NH_4 low level. The mean concentrations of Al, Fe, Zn, and Cu were 323 ppt, 251 ppt, 435 ppt, and 118 ppt, respectively. These concentration levels are much higher than those reported for snow and ice from inland area but comparable with those measured at the Syowa Station and the site S16 near the site S25. The metal organic compounds of these heavy metal elements were firstly determined in the Antarctic snow and their contributions to the total amounts were significant. This new finding, in association with the observation that the organic heavy metal compounds has also been found in atmospheric aerosols collected in the Antarctic air as well as in the marine air, suggests their new possible origin and path to the Antarctica.

著者

Watanabe Okitsugu National Institute of Polar Research, Research Organization of Information and Systems
Watanabe Okitsugu National Institute Of Polar Research
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 Satoru Institute For Hydrospheric And Atmospheric Sciences Nagoya University
Kanamori Nobuko Atmospheric And Hydrospheric Research Institute Nagoya University
Kanamori Satoru Water Research Institute Nagoya University
Kanamori Nobuko National Institute Of Polar Research
Osada Kazuo Meteorological Research Institute
Osada Kazuo Water Research Institute, Nagoya University
Isa Eriko Water Research Institute, Nagoya University
Isa Eriko Water Research Institute Nagoya University
Watanabe Okitsusgu National Institute of Polar Research
Kanamori Satoru National Institute of Polar Research
Nishio F Center For Environmental Remote Sensing Chiba University
Nishio F Chiba Univ. Chiba Jpn
Kobayashi Shunichi Research Institute Of Hazards In Snowy Area Niigata University
Nishio Fumihiko Hokkaido University Of Education Kushiro Branch
Osada K Graduate School Of Environmental Studies Nagoya University
Osada Kazuo Water Research Institute Nagoya University
Kawaguchi S Kyushu Univ.
Nishikawa Masataka National Institute For Environment Studies
Kanamori Nobuko Water Research Institute Nagoya Univerisity

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