MEASUREMENTS OF METHANE CONCENTRATION IN THE AIR AND SURFACE SEAWATER ON BOARD THE ICEBREAKER SHIRASE
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...
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ftnipr:oai:nipr.repo.nii.ac.jp:00003753 2023-05-15T13:49:01+02:00 MEASUREMENTS OF METHANE CONCENTRATION IN THE AIR AND SURFACE SEAWATER ON BOARD THE ICEBREAKER SHIRASE ハシダ ゲン ナカザワ タカキヨ タナカ マサユキ アオキ シュンジ ヤマノウチ タカシ カワグチ サダオ シミズ アキラ ハヤシ マサヒコ Gen HASHIDA Takakiyo NAKAZAWA Masayuki TANAKA Shuhji AOKI Takashi YAMANOUCHI Sadao KAWAGUCHI Akira SHIMIZU Masahiko HAYASHI 1992-12 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3753 http://id.nii.ac.jp/1291/00003753/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3753&item_no=1&attribute_id=18&file_no=1 en eng ABSTRACT Center for Atmospheric and Oceanic Studies, Faculty of Science, Tohoku University National Institute of Polar Research National Institute for Environmental Studies Solar-Terrestrial Environment Laboratory, Nagoya University https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3753 http://id.nii.ac.jp/1291/00003753/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 6, 149(1992-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3753&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1992 ftnipr 2022-12-10T19:45:50Z 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. Report Antarc* Antarctic Antarctica Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology National Institute of Polar Research Repository, Japan Antarctic The Antarctic |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
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ftnipr |
language |
English |
description |
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. |
format |
Report |
author |
ハシダ ゲン ナカザワ タカキヨ タナカ マサユキ アオキ シュンジ ヤマノウチ タカシ カワグチ サダオ シミズ アキラ ハヤシ マサヒコ Gen HASHIDA Takakiyo NAKAZAWA Masayuki TANAKA Shuhji AOKI Takashi YAMANOUCHI Sadao KAWAGUCHI Akira SHIMIZU Masahiko HAYASHI |
spellingShingle |
ハシダ ゲン ナカザワ タカキヨ タナカ マサユキ アオキ シュンジ ヤマノウチ タカシ カワグチ サダオ シミズ アキラ ハヤシ マサヒコ Gen HASHIDA Takakiyo NAKAZAWA Masayuki TANAKA Shuhji AOKI Takashi YAMANOUCHI Sadao KAWAGUCHI Akira SHIMIZU Masahiko HAYASHI MEASUREMENTS OF METHANE CONCENTRATION IN THE AIR AND SURFACE SEAWATER ON BOARD THE ICEBREAKER SHIRASE |
author_facet |
ハシダ ゲン ナカザワ タカキヨ タナカ マサユキ アオキ シュンジ ヤマノウチ タカシ カワグチ サダオ シミズ アキラ ハヤシ マサヒコ Gen HASHIDA Takakiyo NAKAZAWA Masayuki TANAKA Shuhji AOKI Takashi YAMANOUCHI Sadao KAWAGUCHI Akira SHIMIZU Masahiko HAYASHI |
author_sort |
ハシダ ゲン |
title |
MEASUREMENTS OF METHANE CONCENTRATION IN THE AIR AND SURFACE SEAWATER ON BOARD THE ICEBREAKER SHIRASE |
title_short |
MEASUREMENTS OF METHANE CONCENTRATION IN THE AIR AND SURFACE SEAWATER ON BOARD THE ICEBREAKER SHIRASE |
title_full |
MEASUREMENTS OF METHANE CONCENTRATION IN THE AIR AND SURFACE SEAWATER ON BOARD THE ICEBREAKER SHIRASE |
title_fullStr |
MEASUREMENTS OF METHANE CONCENTRATION IN THE AIR AND SURFACE SEAWATER ON BOARD THE ICEBREAKER SHIRASE |
title_full_unstemmed |
MEASUREMENTS OF METHANE CONCENTRATION IN THE AIR AND SURFACE SEAWATER ON BOARD THE ICEBREAKER SHIRASE |
title_sort |
measurements of methane concentration in the air and surface seawater on board the icebreaker shirase |
publisher |
ABSTRACT |
publishDate |
1992 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3753 http://id.nii.ac.jp/1291/00003753/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3753&item_no=1&attribute_id=18&file_no=1 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology |
genre_facet |
Antarc* Antarctic Antarctica Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3753 http://id.nii.ac.jp/1291/00003753/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 6, 149(1992-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3753&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250430882381824 |