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中緯度における最後の氷河期最大期のほぼ同期的な半球間終結です
Joerg M Schaefer1, George H Denton, David J A Barrell
1Lamont-Doherty Earth Observatory (L-DEO), Palisades, NY 10964, USA. schaefer@ldeo.columbia.edu
Science (New York, N.Y.)
|June 10, 2006
まとめ
最後の氷河期の終わりの地球温暖化は非同期的であったが,中緯度の氷河の撤退は両半球で同時に始まった. これは,地球全体の気温上昇が北大西洋の寒い冬に覆われたことを示唆している.
科学分野:
- 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
- 氷河学 氷河学とは
- ジオクロノロジー (Geochronology) について
背景:
- 極地氷の核からの同位体記録は,最後の氷河期後の非同期的な地球温暖化を示唆しています.
- 以前の研究では,半球間の脱氷の時間軸が異なることが示されました.
研究 の 目的:
- 最後の氷河期最大期の終わりに,中緯度の氷河が後退するタイミングを調査する.
- 明らかに非同期的な地球温暖化と同期的な氷河の退却を調和させるため.
主な方法:
- 10Be (ベリリウム-10) の被曝が氷河の退却に利用された.
- 温度と大気中のCO2データのための極地氷のコアからの同位体記録を分析しました.
主要な成果:
- 10Beの露出年代測定は,両半球の中緯度の氷河の同期的な大規模な後退を明らかにした.
- 氷河の退却のタイミングは,温度とCO2の上昇を示している南極の氷芯データと一致しています.
- 北大西洋の地域は,広範囲の海氷により超寒い冬を経験し,地球温暖化傾向を潜在的に遮断しました.
結論:
- 最後の氷河期最大期の終わりの地球温暖化傾向は,局所的な気候異常によって,いくつかの地域でマスクされた可能性が高い.
- 同期的な氷河の退却は,地域的な変動にもかかわらず,地球温暖化現象を協調的にサポートします.
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