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Investigating the Microbial Community in the Termite Hindgut - Interview
Published on: May 28, 2007
過去2000年にわたる世界的なメタン予算の予期せぬ変化
D F Ferretti1, J B Miller, J W C White
1Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, USA. d.ferretti@niwa.co.nz
まとめ
南極の氷の核における安定炭素同位体の測定は,工業化前のHoloceneの終わり期に予期せぬメタン予算の変化を明らかにします. バイオマス燃焼による排出量は大きく変動し,世界のメタン予算に影響を及ぼした.
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
- 大気化学 大気化学
- 地質化学 地質化学
背景:
- 工業化以前のホロケーン期のメタン予算とその要因は完全に理解されていません.
- 大気中のメタン (CH4) は,地球の気候システムにおいて重要な役割を果たしています.
- メタンの安定した炭素同位体 (デルタ13CH4) は,メタン源とシンクに関する重要な洞察を提供します.
研究 の 目的:
- 南極の氷の核データを用いて,工業化以前のホロセンの末期メタン予算を再構築する.
- メタンの源,特にバイオマス燃焼による排出量の変動を調査する.
- 工業化以前のメタン排出量に対する人間活動と気候変動の影響を評価する.
主な方法:
- 大気中のメタン (デルタ13CH4) の安定した炭素同位体の分析 2000年の南極の氷核記録から.
- 排出量の変化を推論するためにメタン源分割のモデリング.
- 同位体データを,既知の気候および人間の活動プロキシと比較.
主要な成果:
- 2000年の期間中に,重要なデルタ13CH4の変動が観察されました.
- メタンの同位体成分は,紀元0~1000年に濃縮され,紀元1000~1700年に枯渇した.
- モデル化されたソース分割は,2つの期間間のバイオマス燃焼による排出量の約40%の削減を示しています.
結論:
- 工業化以前のバイオマス燃焼による排出量は大きく変動し,以前は過小評価されていた.
- 人為要因と自然気候の変動の両方がこれらの排出に影響を与えた.
- 工業化以前のホロセンの末期におけるメタン予算は,これまで考えられていたよりもダイナミックでした.
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