湖の堆積物における温度制御された有機炭素鉱化
Cristian Gudasz1, David Bastviken, Kristin Steger
1Limnology, Department of Ecology and Evolution, Uppsala University, Norbyvägen 18D, SE-752 36 Uppsala, Sweden. cristian.gudasz@ebc.uu.se
Nature
|July 24, 2010
まとめ
暖かい気温は湖の堆積物における有機炭素鉱化を促進し,炭素埋葬を減少させます. 気候変動により,北極湖が炭素を貯蔵する能力が著しく低下する可能性があります.
科学分野:
- 環境科学 環境科学
- リムテクノロジーとは
- バイオジオケミストリー バイオジオケミストリー
背景:
- 湖のような内陸水は,世界の炭素循環の重要な構成要素ですが,他の炭素吸収池と比較して,研究への関心は限られています.
- 湖の堆積物に堆積した有機炭素は鉱化または長期埋葬され,世界の炭素予算に影響を与えます.
- 堆積物の有機炭素の動態を制御する要因を理解することは,気候変動の影響を予測するために不可欠です.
研究 の 目的:
- 堆積物の有機炭素鉱化と北極湖の温度との関係を調査する.
- 予測される気候変動が湖の生態系における有機炭素埋葬にどのように影響するかを評価するためである.
主な方法:
- スウェーデンの北極湖のクロスシステム調査を実施しました.
- 気候,生産性,炭素源によって異なる,世界中の様々な湖から公表されたデータをまとめ,分析しました.
- 堆積物の有機炭素鉱化率と水の温度との相関を調べました.
主要な成果:
- 湖の堆積物における有機炭素鉱化と温度との間に有意な正の相関が見られた.
- 温度の上昇は鉱化が増加し,その結果,有機炭素埋蔵が減少する.
- IPCCの気候変動シナリオでは,北極湖の年間有機炭素埋蔵量の4~27%の減少が予測されている.
結論:
- 湖の堆積物の有機炭素鉱化は,温度に対して非常に敏感です.
- 地球の気温上昇は,長期的な炭素吸収源としての北極湖の役割を低下させる可能性があります.
- 将来の湖への炭素埋葬は,気候変動の影響を受ける可能性が高いため,世界の炭素循環モデルを更新する必要がある.
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