VARIATIONS OF THE CO_2,CH_4 AND N_2O CONCENTRATIONS AND δ^<13>C OF CO_2 IN THE GLACIAL PERIOD DEDUCED FROM AN ANTARCTIC ICE CORE, SOUTH YAMATO

• Main Authors: マチダ トシノブ, ナカザワ タカキヨ, ナリタ ヒデキ, フジイ ヨシユキ, アオキ シュンジ, ワタナベ オキツグ, Toshinobu MACHIDA, Takakiyo NAKAZAWA, Hideki NARITA, Yoshiyuki FUJII, Shuhji AOKI, Okitsugu WATANABE
• Format: Report
• Language: English
• Published: Center for Atmospheric and Oceanic Studies, Faculty of Science, Tohoku University:(Present address) National Institute for Environmental Studies 1996
• Subjects: Antarctic; Yamato; Antarc*; Antarctica; ice core; Polar meteorology and glaciology; Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3924; http://id.nii.ac.jp/1291/00003924/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3924&item_no=1&attribute_id=18&file_no=1

To reconstruct variations of atmospheric greenhouse gases in the glacial period, air in an ice core recovered from a bare ice field in the southern part of the Yamato Mountains, Antarctica was extracted and then the CO_2,CH_4 and N_2O concentrations and δ^<13>C of CO_2 were analyzed. The CO_2,CH_4 and N_2O concentrations were obviously lower than the pre-industrial Holocene values, suggesting that this ice core was formed in the glacial period. The variations of the CO_2,CH_4 and N_2O concentrations during the glacial period showed a good correlation with that of δ^<18>O of ice from the core. The CO_2 concentrations varied almost opposite in phase with δ^<13>C, which implies that CO_2 with isotopically light carbon was added to or subtracted from the atmosphere in the glacial period.