溶解した有機物質を通して,深海に炭素を効率的に輸出する
Charles S Hopkinson1, Joseph J Vallino
1The Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts 02543, USA. chopkins@mbl.edu
Nature
|January 15, 2005
まとめ
海洋溶解有機炭素 (DOC) の輸出は,炭素循環にとって極めて重要です. 新しい研究により,DOM再鉱化には明確なC:N:P比があり,世界の炭素輸出と元素バランスに影響を及ぼすことが明らかになりました.
科学分野:
- 海洋化学 海洋化学について
- バイオジオケミカルサイクルとは
- 海洋学 海洋学とは
背景:
- 海洋溶解有機炭素 (DOC) は大気中のCO2に影響を与える主要な炭素プールです.
- 溶けた有機物質 (DOM) の動態を理解することは,海洋の炭素循環の鍵です.
- DOMダイナミクスの元素ステキオメトリー (C:N:P) はよくわかっていない.
研究 の 目的:
- DOMプールのC:N:Pステキオメトリーと分解を調査する.
- DOMステキオメトリを異なる海洋環境 (大陸棚,斜面,渦) で比較する.
- DOMステキオメトリーの炭素輸出と元素バランスの影響を理解する.
主な方法:
- 様々な海洋地域におけるDOM C:N:Pステキオメトリーの分析.
- DOMの再鉱化と生産ステキオメトリーの定量化.
- DOMステキオメトリーと有機粒子の比較と散発プール.
主要な成果:
- DOMは再鉱化され,C:N:Pステキオメトリー199:20:1で生成されます.
- この比率はバルクプールの比率より低いが,有機粒子のレッドフィールド比率より高い.
- DOMステキオメトリーは,与えられたNとPの入力に対して,より大きなDOC輸出の可能性を示唆しています.
結論:
- DOMステキオメトリーは,地表水からの炭素輸出の効率に影響を与える.
- この調査結果は,世界の炭素輸出と元素バランスの制約を示している.
- このステキオメトリーは,深海で観察された過剰呼吸を説明するかもしれない.
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