初期エオセンの地球温暖化のメカニズムとして,火山盆地からメタンの放出
Henrik Svensen1, Sverre Planke, Anders Malthe-Sørenssen
1Physics of Geological Processes, University of Oslo, PO Box 1048 Blindern, 0316 Oslo, Norway. hsvensen@geo.uio.no
Nature
|June 4, 2004
まとめ
火山活動による大量メタンの放出は,エオセンの時代に極端な地球温暖化を引き起こした.
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
- 地質学 地質学 地質学
- 地質化学 地質化学
背景:
- エオセンの時代は,炭素と酸素の同位体シフトによって証明される極端な地球温暖化で始まった.
- この温暖化は,地球システムに急激に,大量に枯渇した炭素が流入することと関連していた.
- 以前の理論では,ガス水素の融解が示唆されていたが,トリガーメカニズムが欠けていた.
研究 の 目的:
- エオセンの初期に大量に炭素が放出されたきっかけを特定するために.
- パレオセーン/エオセーン境界の気候現象における火山活動の役割を調査する.
主な方法:
- VøringとMøreの盆地からの地震反射プロフィールの分析.
- 何千もの熱水噴出孔の複合体の特定.
主要な成果:
- ノルウェー海に多数の熱水噴出孔複合体の証拠がある.
- これらの特徴とパレオセーン/エオセンの境界との相関.
結論:
- マントルから派生した溶液が炭素に富んだ堆積物の中に侵入すると,おそらく,風口複合体経由でメタンの放出を引き起こした.
- この火山のプロセスは,初期のエオセンの地球温暖化と関連する炭素循環の変化を誘発します.
- 似たようなメカニズムは,他の大きな火山地帯に関連した気候現象を説明するかもしれない.
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