Quaternary earth system dynamics explored with ice core records

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  • 氷床コアから探る第四紀後期の地球システム変動
  • ヒョウショウ コア カラ サグル ダイ4キ コウキ ノ チキュウ システム ヘンドウ

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Ice cores have played a crucial role in Quaternary climate research. In particular, deep ice cores from Antarctica and Greenland have revealed important paleoenvironmental events such as co-varying greenhouse gases with global climate and many abrupt climate changes during glacial periods. The Dome Fuji ice core drilled by Japan was recently dated using the orbital tuning of O2/N2 ratio of trapped air, which records local summer insolation through physical mechanisms, to improve the dating accuracy to ∼2,000 years (Kawamura et al., 2007). This chronology provides important clues for understanding the timing and mechanism of global environmental changes. Here I summarize phasing between Antarctic climate and atmospheric CO2 concentration, the relationship between climatic variations of Antarctica and other parts of the globe, and the relationship between climatic variations on different time scales, which are all necessary for investigating the mechanisms of glacial-interglacial climatic variation. With an integrated understanding of climatic variations on various spatial and time scales, it is argued that the timing of Antarctic climate variations is consistent with the Milankovitch theory of 100-kyr glacial cycles. It is important to extend the accurate chronology based on the second Dome Fuji ice core, and to conduct detailed ice-core reconstructions around the past interglacial periods.

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