INCREASING ATMOSPHERIC CONCENTRATIONS OF LONG-LIVED HALOCARBONS AND METHANE
A great concern has been indicated again about the increasing atmospheric concentrations of long-lived anthropogenic halocarbons regarding the "ozone hole" observed recently over Antarctica, and the increase in atmospheric methane concentration has also received a great attention because o...
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ftnipr:oai:nipr.repo.nii.ac.jp:00003533 2023-05-15T13:49:00+02:00 INCREASING ATMOSPHERIC CONCENTRATIONS OF LONG-LIVED HALOCARBONS AND METHANE マキデ ヨシヒロ クボ ユウジ トミナガ タケシ Yoshihiro MAKIDE Yuji KUBO Takeshi TOMINAGA 1987-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3533 http://id.nii.ac.jp/1291/00003533/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3533&item_no=1&attribute_id=18&file_no=1 en eng ABSTRACT Department of Chemistry, Faculty of Science, The University of Tokyo National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3533 http://id.nii.ac.jp/1291/00003533/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 1, 146(1987-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3533&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1987 ftnipr 2022-12-10T19:45:40Z A great concern has been indicated again about the increasing atmospheric concentrations of long-lived anthropogenic halocarbons regarding the "ozone hole" observed recently over Antarctica, and the increase in atmospheric methane concentration has also received a great attention because of its "greenhouse effect" in addition to the effect by CO_2. We have been measuring atmospheric concentrations of those halocarbons (CCl_2F_2,CCl_3F, CH_3CCl_3,etc.) and methane (CH_4) in Antarctica as well as in the Northern Hemisphere (N. H.) in order to clarify behaviors of these compounds in the atmosphere and to estimate future trends of concentrations and their effects on the earth's environment. Surface-level samples in Antarctica have been collected (since 1982) at 500-1000m NE of Syowa Station into all-stainless steel sample canisters which had been prepared in extremely clean conditions and evacuated for grab-sampling. All the Antarctic samples have been analyzed after 3-15 months at University of Tokyo by ECD gaschromatography (for halocarbons) and by FID gaschromatography (for methane). Averaged concentrations in the mid-latitude N. H. have been obtained (since 1979) by analyzing the samples collected in Hokkaido (42-45°N) every summer (July-August) and winter (January-February). The CCl_2F_2 and CCl_3F concentrations observed in Antarctica have been 8-10% lower than those observed in Hokkaido in accordance with the predominant emission of these halocarbons in the N. H. and their delayed diffusion into the Southern Hemisphere across the Intertropical Convergence Zone. The concentration of CH_3CCl_3 has been about 30% lower in Antarctica in accordance with its relatively short atmospheric lifetime (about 6 years) due to the reaction with tropospheric OH radicals. The atmospheric concentrations of CCl_2F_2 and CCl_3F have been increasing steadily (almost linearly) in both hemispheres (by 4-5% every year). These increments of CCl_2F_2 and CCl_3F concentrations correspond to their unchanged or rather increasing releases ... 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 Fid ENVELOPE(-65.939,-65.939,-68.664,-68.664) Syowa Station The Antarctic |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
A great concern has been indicated again about the increasing atmospheric concentrations of long-lived anthropogenic halocarbons regarding the "ozone hole" observed recently over Antarctica, and the increase in atmospheric methane concentration has also received a great attention because of its "greenhouse effect" in addition to the effect by CO_2. We have been measuring atmospheric concentrations of those halocarbons (CCl_2F_2,CCl_3F, CH_3CCl_3,etc.) and methane (CH_4) in Antarctica as well as in the Northern Hemisphere (N. H.) in order to clarify behaviors of these compounds in the atmosphere and to estimate future trends of concentrations and their effects on the earth's environment. Surface-level samples in Antarctica have been collected (since 1982) at 500-1000m NE of Syowa Station into all-stainless steel sample canisters which had been prepared in extremely clean conditions and evacuated for grab-sampling. All the Antarctic samples have been analyzed after 3-15 months at University of Tokyo by ECD gaschromatography (for halocarbons) and by FID gaschromatography (for methane). Averaged concentrations in the mid-latitude N. H. have been obtained (since 1979) by analyzing the samples collected in Hokkaido (42-45°N) every summer (July-August) and winter (January-February). The CCl_2F_2 and CCl_3F concentrations observed in Antarctica have been 8-10% lower than those observed in Hokkaido in accordance with the predominant emission of these halocarbons in the N. H. and their delayed diffusion into the Southern Hemisphere across the Intertropical Convergence Zone. The concentration of CH_3CCl_3 has been about 30% lower in Antarctica in accordance with its relatively short atmospheric lifetime (about 6 years) due to the reaction with tropospheric OH radicals. The atmospheric concentrations of CCl_2F_2 and CCl_3F have been increasing steadily (almost linearly) in both hemispheres (by 4-5% every year). These increments of CCl_2F_2 and CCl_3F concentrations correspond to their unchanged or rather increasing releases ... |
format |
Report |
author |
マキデ ヨシヒロ クボ ユウジ トミナガ タケシ Yoshihiro MAKIDE Yuji KUBO Takeshi TOMINAGA |
spellingShingle |
マキデ ヨシヒロ クボ ユウジ トミナガ タケシ Yoshihiro MAKIDE Yuji KUBO Takeshi TOMINAGA INCREASING ATMOSPHERIC CONCENTRATIONS OF LONG-LIVED HALOCARBONS AND METHANE |
author_facet |
マキデ ヨシヒロ クボ ユウジ トミナガ タケシ Yoshihiro MAKIDE Yuji KUBO Takeshi TOMINAGA |
author_sort |
マキデ ヨシヒロ |
title |
INCREASING ATMOSPHERIC CONCENTRATIONS OF LONG-LIVED HALOCARBONS AND METHANE |
title_short |
INCREASING ATMOSPHERIC CONCENTRATIONS OF LONG-LIVED HALOCARBONS AND METHANE |
title_full |
INCREASING ATMOSPHERIC CONCENTRATIONS OF LONG-LIVED HALOCARBONS AND METHANE |
title_fullStr |
INCREASING ATMOSPHERIC CONCENTRATIONS OF LONG-LIVED HALOCARBONS AND METHANE |
title_full_unstemmed |
INCREASING ATMOSPHERIC CONCENTRATIONS OF LONG-LIVED HALOCARBONS AND METHANE |
title_sort |
increasing atmospheric concentrations of long-lived halocarbons and methane |
publisher |
ABSTRACT |
publishDate |
1987 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3533 http://id.nii.ac.jp/1291/00003533/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3533&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(-65.939,-65.939,-68.664,-68.664) |
geographic |
Antarctic Fid Syowa Station The Antarctic |
geographic_facet |
Antarctic Fid Syowa Station 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=3533 http://id.nii.ac.jp/1291/00003533/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 1, 146(1987-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3533&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250406445318144 |