High temporal resolution chemical analysis of H72 ice core in east Dronning Maud Land, Antarctica

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概要

• 論文の詳細を見る

• The H72 ice core collected in east Dronning Maud Land, Antarctica has been analyzed in detail. Concentrations of Na^+ and Cl^- indicate the highest correlation coefficients, so we can say that both ions in the H72 ice core originated from sea salt. The fluctuation pattern of δ18O below the depth of 45m proves that the δ^(18)O distribution is smoothed by water vapor diffusion in the firn layer. An increasing tendency of NO_3^- and nssSO_4^(2-) concentrations in the shallow layer has not been found in the H72 ice core. The H72 ice core is dated as AD 1837 by the periodic concentration fluctuation of MSA at 73.29m depth. Volcanic signals are detected in 49 layers in the H72 ice core. In the late 19th century many volcanic eruptions were recorded, which explains why many volcanic signals are present in the H72 ice core. It is noted that a year with low temperatures in winter and a low annual minimum δ^(18)O will have high surface mass balance and more snowfall. Considerable nssSO_4^(2-) has been released into the atmosphere by human activity in the 20th century, but we cannot find traces of a recent increase in deposition of nssSO_4^(2-) at the H72 site.

• 国立極地研究所の論文

著者

• Igarashi Makoto

  National Institute of Polar Research, Research Organization of Information and Systems

• Motoyama Hideaki

  National Institute Of Polar Research

• Suzuki Keisuke

  Department of Environmental Sciences, Shinshu University

• Anzai Kaori

  Department of Environmental Sciences, Shinshu University

• Suzuki Keisuke

  Department Of Electrical And Electronic Engineering Niigata University

• Anzai Kaori

  Department Of Environmental Sciences Shinshu University

• Igarashi Makoto

  National Institute Of Polar Research

• Suzuki Keisuke

  Department Of Chemistry Tokyo Institute Of Technology

• Motoyama Hideaki

  National Inst. Of Polar Res. 10-3 Midori-cho Tachikawa-shi Tokyo 190-8518 Jpn

• Igarashi Makoto

  National Inst. Of Polar Res. 10-3 Midori-cho Tachikawa-shi Tokyo 190-8518 Jpn

• Suzuki Keisuke

  Department Of Chemistry Keio University

• Suzuki Keisuke

  Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Yamanashi University

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