南洋における人類による二酸化炭素の輸送は,エクマン流によって引き起こされる
1Department of Atmospheric Science, Colorado State University, 1371 Campus Delivery, Fort Collins, Colorado 80523-1371, USA. ito@atmos.colostate.edu
Nature
|January 8, 2010
まとめ
南大洋は,人類による二酸化炭素 (CO2) を吸収し,重要な炭素吸収場として機能します. 風力によるエクマン輸送は,CO2を国境を越えて移動させ,気候の変動に影響を与えるための鍵です.
科学分野:
- 海洋学 海洋学 海洋学
- 気候科学 気候科学
- 炭素循環に関する研究
背景:
- 南極海の大きな表面積と循環は,それが人類による二酸化炭素 (CO2) の主要なシンクであることを示唆しています.
- 二酸化炭素の吸収,輸送,および海洋流 (エクマン流,渦) による規制のメカニズムは,まだ十分に理解されていません.
- 風による流れ,メソスケールの渦,そして潜流の相互作用は,炭素輸送経路に影響を与えます.
研究 の 目的:
- 南大洋の人類によるCO2吸収を制御するメカニズムを調査する.
- 2年間のCO2の吸収と輸送の年間内変動を分析する.
- CO2輸送におけるエクマン流と渦の相対的な役割を決定する.
主な方法:
- 高解像度の海洋循環と炭素循環モデルを使用した.
- 2年間にわたる人為的なCO2の年内変動に焦点を当てた.
- 密度コーディネートによる雇用予算分析.
主要な成果:
- 炭素吸収パターンは,海洋の垂直交換と相関し,南極極極前線でピークに達します.
- エクマン輸送は,地域統合された,クロスフロントのCO2輸送の主な推進力であり,渦が局所的な役割を果たしています.
- 横断輸送の年間内変動は主にエクマン流によって制御され,渦の補償は最小限です.
- 極地フロントを横断する風による輸送と,亜熱帯フロントでの沈下は極めて重要です.
結論:
- 海洋の炭素吸収は,エクマン輸送の時間的な変動を通じて気候の変動と密接に関連しています.
- エクマンの流れは,南洋の国境を越えて大規模なCO2輸送の支配的なメカニズムです.
- これらのダイナミクスを理解することは,世界の炭素予算と気候変動の影響を正確にモデル化するために不可欠です.
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