Reconstruction of the atmospheric CO2 concentration history from an Antarctic deep ice core, Dome Fuji using a wet extraction technique: analysis procedures,dating of air in ice and concentration variations (scientific paper)

元データ 国立極地研究所

概要

In order to deduce the atmospheric CO2 concentration variations over the past 320 kyr, air samples were extracted from the Dome Fuji deep ice core using a wet extraction method, and their CO2 concentration values were determined with a reproducibility of 1.0 ppmv. By measuring the CO2 concentrations of firn air samples collected at Dome Fuji, it was found that the effective bubble close-off depth can be defined by the mid-point of the close-off zone. For dating the air in the ice core, the age difference between ice and air (Δage) was estimated by using a densification model to be between 1000 and 5000 years, showing small and large values during the interglacial and glacial periods, respectively, due primarily to variations of precipitation. The CO2 concentration variations with a mean time resolution of about 1.1 kyr over the last three glacial-interglacial cycles showed a good correlation with those of δ18O, which suggests that the Southern Ocean played an important role in the variation of the atmospheric CO2 concentration during the last three glacial-interglacial cycles.

著者

藤井 理行 国立極地研究所
Watanabe Okitsugu National Institute of Polar Research, Research Organization of Information and Systems
Fujii Yoshiyuki National Institute of Polar Research, Research Organization of Information and Systems
Kawada Kunio Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
張 紀久夫 阪大基:福井工大工
Kawamura Kenji Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
Watanabe O National Institute Of Polar Research Research Organization Of Information And Systems
Watanabe Okitsugu National Institute Of Polar Research
Kamiyama K National Institute Of Polar Research Research Organization Of Information And Systems
Nakazawa Takakiyo Center for Atmospheric and Oceanic Studies, Tohoku University
Aoki Shuji Center for Atmospheric and Oceanic Studies, Tohoku University
Nakazawa Takakiyo Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
AOKI Shuhji National Institute of Polar Research
Aoki S Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
Kawamura K Center For Atmospheric And Oceanic Studies Tohoku University
Kawada K Toyama Univ. Toyama
清水 明 東大教養
Aoki Shuji Center For Atmospheric And Oceanic Studies Graduate School Of Sci. Tohoku Univ.
Aoki Shuhji Faculty Of Science Tohoku University
Aoki Syuji National Institute Of Polar Research
清水 明 東大院総合文化・科技団
Fujii Yoshiyuki National Institute Of Polar Research
Watanabe Okitsusgu National Institute of Polar Research
Sugawara Satoshi Institute of Earth Science,Miyagi University of Education
Kawada Kunio Department Earth Science Toyama University
Kamiyama Kokichi National Institute Of Polar Research Research Organization Of Information And Systems
Nakazawa Takakiyo Center For Atmospheric And Oceanic Studies Graduate School Of Sci. Tohoku Univ.
Fujii Y National Inst. Polar Res. Tokyo
Nakazawa Takakiyo Center For Atmospheric And Oceanic Studies Faculty Of Science
清水 明 Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
Nakazawa T Center For Atmospheric And Oceanic Studies Faculty Of Science
Sugawara Satoshi Institute Of Earth Science Miyagi University Of Education
SHIMIZU Akira Deparment of Physics, Rikkyo University

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