MEASUREMENTS OF METHANE CONCENTRATION IN THE AIR AND SURFACE SEAWATER ON BOARD THE ICEBREAKER SHIRASE

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概要

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• Methane concentrations in surface seawater and the lower troposphere were measured on board the icebreaker SHIRASE at almost every 5°latitude between Japan and Antarctica from November 1990 to April 1991. The atmospheric methane concentration measured in November and December 1990 was 1750-1770 ppbv in the mid-northern hemisphere, and decreased rapidly going southward until constant values of about 1670 ppbv were found in the southern hemisphere. A large discontinuity of the methane concentration was observed in the equatorial region due to suppression of interhemispheric air exchange by the Inter-Tropical Convergence Zone. The methane concentrations measured in the mid-southern hemisphere in March and April 1991 was lower by 15 ppbv than those in December 1990,reflecting the seasonal variation of the methane concentration. The methane concentration in surface seawater, which was determined by analyzing air samples equilibrated with oceanic methane, showed 3000-10000ppbv except in the Antarctic region where the concentration was about 2000 ppbv. These values were much higher than the those found in previous studies. Taking account of the fact that carbon dioxide concentrations of the air samples which were measured simultaneously agreed well with those of continuous measurements, such high concentrations cannot be ascribed to failure in sample collection. Therefore, the cause may be attributable to additional methane produced by organic decomposition in sample seawater tubing which was provided on SHIRASE.

• 国立極地研究所の論文

著者

• 張 紀久夫

  阪大基:福井工大工

• Yamanouchi Takashi

  National Institute of Polar Research

• HAYASHI Masahiko

  Solar Terrestrial Environment Laboratory, Nagoya University

• Takata Morimasa

  National Institute Of Polar Research

• Kawaguchi Sadao

  Nagaoka National College Of Technology

• Hashida Gen

  National Institute Of Polar Research

• Hashida Gen

  Center For Antarctic Environment Monitoring National Institute Of Polar Research

• Shimohara Kimiko

  Kitami Institute of Technology

• Nakazawa Takakiyo

  Center for Atmospheric and Oceanic Studies, Tohoku University

• Nakazawa Takakiyo

  Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University

• Aoki Shuji

  Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University

• SHIMIZU Akira

  National Institute for Environmental Studies

• KAWAGUCHI Sadao

  National Institute of Polar Research

• TANAKA Masayuki

  Center for Atmospheric and Oceanic Studies, Faculty of Science, Tohoku University

• AOKI Shuhji

  National Institute of Polar Research

• Yamanouchi Takashi

  National Institute For Polar Research

• Aoki Shuhji

  Faculty Of Science Tohoku University

• Tanaka Masayuki

  Center For Atmospheric And Oceanic Studies Faculty Of Science Tohoku University

• Satow Kazuhide

  Nagoya Technical College

• Nakazawa Takakiyo

  Center For Atmospheric And Oceanic Studies Graduate School Of Sci. Tohoku Univ.

• Hayashi Masahiko

  Solar Terrestrial Environment Laboratory Nagoya University

• Nakazawa Takakiyo

  Center For Atmospheric And Oceanic Studies Faculty Of Science

• 清水 明

  Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University

• Shinbori K

  Hokkaido Univ. Sapporo

• Nakazawa T

  Center For Atmospheric And Oceanic Studies Faculty Of Science

• Yamada T

  Geosystems Inc.

• Kawaguchi Sadao

  Nagoya University

• Yamanouchi Takashi

  National Inst. Of Polar Res. And Dep. Of Polar Sci. The Graduate Univ. For Advanced Studies 10-3 Mid

• Yamanouchi Takashi

  National Institute Of Polar Research 10-3 Midoricho Tachikawa Tokyo Japan.

• Tanaka Masayuki

  Department Of Materials Science And Processing Graduate School Of Engineering Osaka University

• Shinbori K

  Nagaoka National College Of Technology

• Yamada Tomomi

  Geosystems Inc.

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