内陸水域からの地球規模の二酸化炭素排出量
Peter A Raymond1, Jens Hartmann, Ronny Lauerwald
1Yale School of Forestry and Environmental Studies, 195 Prospect Street, New Haven, Connecticut 06511, USA.
Nature
|November 22, 2013
まとめ
内部水域からの地球規模の二酸化炭素 (CO2) 逃逸は,以前に推定されたよりも高い. この研究は,地域的な大きな違いを明らかにし,河川や小川からのCO2フロースのホットスポットを特定しています.
科学分野:
- 環境科学 環境科学
- 地質化学 地質化学
- 気候科学 気候科学
背景:
- 内陸水域からの二酸化炭素 (CO2) 脱出は,地球規模の炭素循環の重要な構成要素であるが,定量化されていない.
- 以前の世界の推定は,表面積,ガス伝送速度,包括的なCO2データベースに関する標準化された枠組みの欠如によって制限されていました.
研究 の 目的:
- 内陸水域からのCO2回避を推定するためのグローバルな枠組みを確立する.
- 内陸水面面積,溶けたCO2,ガス伝達速度における地域的変動を分析する.
- 更新された世界のCO2回避率を提供するために.
主な方法:
- 内陸水面面積とガス移動速度を推定するための枠組みの開発.
- 内陸水域の世界的なCO2データベースの作成.
- 川,小川,湖,貯水池からのCO2回避率の地域分析.
主要な成果:
- 世界のCO2脱出率は,小川/川から年間1.8PgC,湖/貯水池から年間0.32PgCと推定されています.
- 全世界のCO2脱出率は2.1PgC/年であり,以前の推定値より高く,河川の流れの増加によって引き起こされた.
- ストリームと河川のCO2逃避における世界的なホットスポットの特定,土地表面の20%から70%のフルス.
結論:
- 内陸水域からの世界的なCO2逃避は,実質的で過小評価されている炭素流量です.
- CO2の逃逸には,河川システムに集中した"ホットスポット"があり,地域格差が大きい.
- 世界的に内陸水のCO2逃逸を促す源とメカニズムを明らかにするために,さらなる研究が必要である.
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