コメントへの返信 "海に溶けた有機硫黄:ペタグラムの生物化学"

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Published on: November 5, 2014

Boris P Koch^1,2,3, Kerstin B Ksionzek^4,2, Oliver J Lechtenfeld^4,5

¹Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany. boris.koch@awi.de.

Science (New York, N.Y.)

|May 27, 2017

まとめ

海洋溶解有機硫黄は年齢とともに減少しますが,混合だけではこの傾向を説明することはできません. 私たちの研究は既存のモデルの限界を明らかにし深海の硫黄循環に関するさらなる研究が必要であることを強調しています

科学分野:

海洋化学
地化学
生地化学のサイクル

背景:

海洋溶解有機硫黄 (DS) は,海洋の年齢とともに顕著に減少しています.
Dittmar et al.のような以前のモデルは,この観察されたDS減少の唯一の要因として混合を提案しました.

研究の目的:

年齢とともに溶けた有機硫黄の減少を説明する仮説に挑戦する
DSステキオメトリーと硫黄を欠いた有機物質の起源を説明する既存のモデルの限界を調査する.

主な方法:

海洋有機物質のステキオメトリック変化の分析
放射性炭素年代測定を用いて硫黄の循環過程を推論する.

主要な成果:

提案された混合モデルは,深海の硫黄を欠いた有機物の起源を考慮することができません.
観察されたステキオメトリックの変化は,単純な混合モデルによって適切に再現されません.
放射性炭素年代測定は,偏った硫黄循環を暗示的に支持し,混合のみの仮説に反する.

結論:

混合だけでは,海洋溶解有機硫黄の減少を年齢とともに説明するには不十分です.
既存のモデルは,硫黄の好ましい循環と硫黄を欠いた有機物質の源を組み込むために精錬する必要があります.
海洋環境における硫黄の複雑な生地化学的循環を完全に理解するには,さらなる研究が必要です.

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