化学的な気象の変化と地質的な炭素循環の水文学的調節
1Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305, USA.
Science (New York, N.Y.)
|March 15, 2014
まとめ
グローバルな地形は地球の温度調節に影響を与えます. 高い地形はシリケート気象フィードバックを強化し,気候の安定性を高め,薄暗い地形はそれを弱め,より大きな温度変動を可能にします.
科学分野:
- 地質化学 地質化学
- 気候科学 気候科学
- ジオモルフォロジー ジオモルフォロジー
背景:
- 地球の気温は,大気中の二酸化炭素 (CO2) とシリケート岩の気象変動の間の長期の負のフィードバックによって調節されます.
- この気候-気象フィードバックの強さは,地質的な時間尺度によって変化することが知られている.
研究 の 目的:
- シリケート気象フィードバックの強さの観察された変動を説明するために.
- 水力学的プロセスと熱力学的限界を組み込むシリケート気象化の新しいモデルを提示する.
主な方法:
- シリケート気象モデルの開発.
- 水力学的プロセスと熱力学的制約を気象流に組み込む.
- 河川流域の物理的,化学的性質の分析.
主要な成果:
- このモデルは,シリケートの耐候性強度が,水文学的プロセスを通して気候および地質学的な力によって調節されていることを示しています.
- 河川の流域特性に依存して,気象変動の熱力学的限界が課される.
- 気候の調節は,地球上の地形が上昇すると最も強く,地形が低下すると最も弱い.
結論:
- トポグラフィとマウンテンベルトの地球上の分布は,惑星全体の温度調節に大きな影響を与えます.
- トポグラフィの変動は,CO2脱気速度の変化とは関係なく,気候の大幅な変動につながる可能性があります.
- トポグラフィは,シリケート気象フィードバックの地球気候の調節における有効性を調節する上で重要な役割を果たします.
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