ATMOSPHERIC CARBON DIOXIDE CONCENTRATION AT SYOWA STATION (69°00′S, 39°35′E), ANTARCTICA (1985)

• Main Authors: ムラヤマ ハルタ, タナカ マサユキ, ナカザワ タカキヨ, カワグチ サダオ, ヤマノウチ タカシ, アオキ シュウジ, シオバラ マサタカ, Haruta MURAYAMA, Masayuki TANAKA, Takakiyo NAKAZAWA, Sadao KAWAGUCHI, Takashi YAMANOUCHI, Shuji AOKI, Masataka SHIOBARA
• Format: Report
• Language: English
• Published: ABSTRACT 1987
• Subjects: Syowa Station; Antarc*; Antarctica; E. Antarctica; 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=3537; http://id.nii.ac.jp/1291/00003537/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3537&item_no=1&attribute_id=18&file_no=1

Since 1984,continuous measurements of the atmospheric CO_2 concentration have been carried out at Syowa Station, Antarctica. Preliminary inspection of the data showed that; (1) a regular diurnal variation is not observable; (2) irregular variations are sometimes observed with an extremely small amplitude of 0.2ppmv at most; (3) a seasonal variation with the minimum concentration in mid-April and the maximum concentration in mid-October and peak-to-peak amplitude of about 1.2ppmv is detected; and (4) an annual mean value of CO_2 concentration is 342.6ppmv. The results obtained in 1985 are as follows : An annual mean value of CO_2 concentration is 343.8ppmv. The pattern of seasonal variation is almost the same as that of the previous year. But a secular increase trend of the CO_2 content is larger than 1984.