大気中のメタン予算へのホロセンの末期の人為的な寄与に関する制限
Logan Mitchell1, Ed Brook, James E Lee
1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA.
Science (New York, N.Y.)
|November 23, 2013
まとめ
工業化以前の Holocene 後のメタンの増加は,主に熱帯で,人間と自然の両方の源から生じた. この発見は,この期間に大気中のメタン濃度の上昇の起源に関する議論を解決します.
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:
- 産業以前の Holocene (LPIH) の後半期の大気中のメタンの上昇は,重要な気候イベントです.
- 以前の仮説では,この増加は人類によるもの,または天然の源にのみ起因すると考えられ,コンセンサスが欠けていた.
研究 の 目的:
- LPIH中のメタン排出量の起源と緯度分布を調査する.
- 観測されたメタンの増加に対する人為的および自然発生源の相対的貢献を決定する.
主な方法:
- グリーンランドと南極の2つの高解像度,高精度の氷核メタン濃度記録の分析.
- 高解像度メタン極間差 (IPD) レコードの構築. 排出場所を推論する.
主要な成果:
- IPDの記録は,LPIHのメタン排出量が主に熱帯から発生していることを示しています.
- 二次排出量の増加は,北半球の亜熱帯地域で確認された.
- 人為的および自然発生源の異なる緯度パターンが利用されました.
結論:
- 人為的および天然のメタン源の両方が,LPIH濃度の上昇を促すのに不可欠でした.
- この研究は,ソース特有の緯度情報を統合することによって,対立する仮説を調和させています.
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