Variations of the carbon isotopic ratio in atmospheric CO_2 over the last 250 years recorded in an ice core from H15,Antarctica
Variations of δ^<13>C in atmospheric CO_2 were reconstructed for the period of 1724 to 1961 by analyzing a high-accumulation ice core drilled at H15,Antarctica. Measured values of δ^<13>C were corrected for the gravitational enrichment which occurred in the firn, on the basis of the anal...
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ftnipr:oai:nipr.repo.nii.ac.jp:00002912 2023-05-15T13:49:00+02:00 Variations of the carbon isotopic ratio in atmospheric CO_2 over the last 250 years recorded in an ice core from H15,Antarctica カワムラ ケンジ ナカザワ タカキヨ マチダ トシノブ モリモト シンジ アオキ シュウジ イシザワ ミサ フジイ ヨシユキ ワタナベ オキツグ Kenji Kawamura Takakiyo Nakazawa Toshinobu Machida Shinji Morimoto Shuhji Aoki Misa Ishizawa Yoshiyuki Fujii Okitsugu Watanabe 2000-11 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2912 http://id.nii.ac.jp/1291/00002912/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2912&item_no=1&attribute_id=18&file_no=1 en eng Scientific Paper Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University National Institute for Environmental Studies National Institute of Polar Research Frontier Research System for Global Change, Institute for Global Change Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2912 http://id.nii.ac.jp/1291/00002912/ AA1129795X Polar meteorology and glaciology, 14, 47-57(2000-11) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2912&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 2000 ftnipr 2022-11-26T19:42:17Z Variations of δ^<13>C in atmospheric CO_2 were reconstructed for the period of 1724 to 1961 by analyzing a high-accumulation ice core drilled at H15,Antarctica. Measured values of δ^<13>C were corrected for the gravitational enrichment which occurred in the firn, on the basis of the analytical results of δ^<15>N in N_2 in the core. From the vertical profile of δ^<15>N calculated using a diffusion model for the firn, it was suggested that the air in the layer shallower than 17m depth was mixed well with the atmosphere over the firn surface. The average value of δ^<13>C during the period 1724-1775 was found to be -6.67±0.11‰. δ^<13>C decreased secularly from this value to -7.33‰ in 1961,and its trend was enhanced especially after the late 19th century, corresponding to the long-term increase of the CO_2 concentration. CO_2 fluxes estimated by deconvolution analysis of the reconstructed CO_2 concentrations with the box-diffusion model accounted for the observed variations of δ^<13>C fairly well. It was also suggested that a dip of δ^<13>C found at the end of the 18th century was attributable to terrestrial biospheric CO_2 emissions enhanced under high air temperatures. Report Antarc* Antarctica ice core Polar meteorology and glaciology National Institute of Polar Research Repository, Japan |
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National Institute of Polar Research Repository, Japan |
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English |
description |
Variations of δ^<13>C in atmospheric CO_2 were reconstructed for the period of 1724 to 1961 by analyzing a high-accumulation ice core drilled at H15,Antarctica. Measured values of δ^<13>C were corrected for the gravitational enrichment which occurred in the firn, on the basis of the analytical results of δ^<15>N in N_2 in the core. From the vertical profile of δ^<15>N calculated using a diffusion model for the firn, it was suggested that the air in the layer shallower than 17m depth was mixed well with the atmosphere over the firn surface. The average value of δ^<13>C during the period 1724-1775 was found to be -6.67±0.11‰. δ^<13>C decreased secularly from this value to -7.33‰ in 1961,and its trend was enhanced especially after the late 19th century, corresponding to the long-term increase of the CO_2 concentration. CO_2 fluxes estimated by deconvolution analysis of the reconstructed CO_2 concentrations with the box-diffusion model accounted for the observed variations of δ^<13>C fairly well. It was also suggested that a dip of δ^<13>C found at the end of the 18th century was attributable to terrestrial biospheric CO_2 emissions enhanced under high air temperatures. |
format |
Report |
author |
カワムラ ケンジ ナカザワ タカキヨ マチダ トシノブ モリモト シンジ アオキ シュウジ イシザワ ミサ フジイ ヨシユキ ワタナベ オキツグ Kenji Kawamura Takakiyo Nakazawa Toshinobu Machida Shinji Morimoto Shuhji Aoki Misa Ishizawa Yoshiyuki Fujii Okitsugu Watanabe |
spellingShingle |
カワムラ ケンジ ナカザワ タカキヨ マチダ トシノブ モリモト シンジ アオキ シュウジ イシザワ ミサ フジイ ヨシユキ ワタナベ オキツグ Kenji Kawamura Takakiyo Nakazawa Toshinobu Machida Shinji Morimoto Shuhji Aoki Misa Ishizawa Yoshiyuki Fujii Okitsugu Watanabe Variations of the carbon isotopic ratio in atmospheric CO_2 over the last 250 years recorded in an ice core from H15,Antarctica |
author_facet |
カワムラ ケンジ ナカザワ タカキヨ マチダ トシノブ モリモト シンジ アオキ シュウジ イシザワ ミサ フジイ ヨシユキ ワタナベ オキツグ Kenji Kawamura Takakiyo Nakazawa Toshinobu Machida Shinji Morimoto Shuhji Aoki Misa Ishizawa Yoshiyuki Fujii Okitsugu Watanabe |
author_sort |
カワムラ ケンジ |
title |
Variations of the carbon isotopic ratio in atmospheric CO_2 over the last 250 years recorded in an ice core from H15,Antarctica |
title_short |
Variations of the carbon isotopic ratio in atmospheric CO_2 over the last 250 years recorded in an ice core from H15,Antarctica |
title_full |
Variations of the carbon isotopic ratio in atmospheric CO_2 over the last 250 years recorded in an ice core from H15,Antarctica |
title_fullStr |
Variations of the carbon isotopic ratio in atmospheric CO_2 over the last 250 years recorded in an ice core from H15,Antarctica |
title_full_unstemmed |
Variations of the carbon isotopic ratio in atmospheric CO_2 over the last 250 years recorded in an ice core from H15,Antarctica |
title_sort |
variations of the carbon isotopic ratio in atmospheric co_2 over the last 250 years recorded in an ice core from h15,antarctica |
publisher |
Scientific Paper |
publishDate |
2000 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2912 http://id.nii.ac.jp/1291/00002912/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2912&item_no=1&attribute_id=18&file_no=1 |
genre |
Antarc* Antarctica ice core Polar meteorology and glaciology |
genre_facet |
Antarc* Antarctica ice core Polar meteorology and glaciology |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2912 http://id.nii.ac.jp/1291/00002912/ AA1129795X Polar meteorology and glaciology, 14, 47-57(2000-11) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2912&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250326132785152 |