Ice-core record of methyl chloride over the last glacial-Holocene climate change

被引:5
作者
Saito, Takuya
Yokouchi, Yoko
Aoki, Shuji
Nakazawa, Takakiyo
Fujii, Yoshiyuki
Watanabe, Okitsugu
机构
[1] Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan
[2] Japan Soc Promot Sci, Tokyo, Japan
[3] Tohoku Univ, Grad Sch Sci, Ctr Atmospher & Ocean Studies, Sendai, Miyagi 9808578, Japan
[4] Natl Inst Polar Res, Tokyo 1738515, Japan
关键词
D O I
10.1029/2006GL028090
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Methyl chloride (CH3Cl) concentration was measured in air trapped in a deep ice core from Dome Fuji, Antarctica covering the last glacial - present interglacial ( Holocene) change. The record shows that the CH3Cl concentration was relatively constant, being similar to the present levels, during the pre-industrial Holocene. In contrast, the CH3Cl concentration was significantly high and variable in the last glacial period, possibly due to impurity-related production of CH3Cl in ice sheet. Under the assumption that the production was the sole cause of the excess CH3Cl, the atmospheric CH3Cl concentration during the last glacial was estimated using simultaneously measured calcium data for the ice core to have been enhanced by 30% compared with the pre-industrial Holocene concentration. Because the major sink of CH3Cl was stronger during the last glacial than during the Holocene, the enhancement of CH3Cl during the last glacial was likely due to the glacial period source being enhanced.
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页数:4
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