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環北極の泥炭地帯の急速な初期開発と大気中のCH4とCO2の変動
Glen M Macdonald1, David W Beilman, Konstantine V Kremenetski
1Department of Geography, University of California, Los Angeles, CA 90095-1524, USA. macdonal@geog.ucla.edu
まとめ
環極の泥炭地帯は16万5千年前に形成され始め,温暖化とともに急速に広がった. 泥炭地帯の開発は,初期のホロセーン時代にメタン (CH4) と二酸化炭素 (CO2) のレベルに影響を与えたが,後のCH4の増加を説明することはできない.
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
- ジオクロノロジー (Geochronology) について
- バイオジオケミストリー バイオジオケミストリー
背景:
- 環極の泥炭地帯は,世界の重要な炭素吸収源である.
- その発生と発展を理解することは,気候モデリングにとって極めて重要です.
- 以前の研究では,泥炭地帯の動態が大気中の温室効果ガスの変動と結びついている.
研究 の 目的:
- 環北極の泥炭地帯開発のタイミングと要因を分析する.
- ホロセンの初期のメタンと二酸化炭素のサイクルにおける泥炭地帯の役割を評価する.
- 大気中のメタンガスへの泥炭地帯の寄与を評価するために,6 ka. の後に増加します.
主な方法:
- 1516年の放射性炭素年代測定の分析.
- 古代気候のプロキシ (夏の太陽照射,気温) との相関.
- 泥炭地型の移行 (フェンズから沼地へ) の評価.
主要な成果:
- トートランド開拓は ~16.5 ka から始まり,12-8 ka の間に爆発的な拡大がありました.
- 急速な発展は,夏の高温と温暖化と一致した.
- 泥炭地帯は,初期のホロセンのCH4ピークとCO2減少,および以前の氷河間変動に寄与しました.
- 後期ホロセンの泥炭地帯の変化は,6カ年後のCH4上昇を説明しない.
結論:
- 初期のホロセンの泥炭地帯の拡大は,気候の温暖化によって引き起こされた.
- 泥炭地帯は,初期のホロセンの温室効果ガス動態において重要な役割を果たしました.
- 新氷河期の泥炭地帯の拡大は,ホロセンの後半の大気中のCH4増加の原因ではない.
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