大陸縁の堆積物からのマンガンの流出は,酸素の最小値を通過するトランセクトで起こります
まとめ
大陸縁の堆積物からのマンガンの流出は,浅いシェルフで最も高い. 沈殿物のマンガンの流動は酸素と共に減少するので,太平洋の地表のマンガンの最大値を説明できない.
科学分野:
- マリン・ジオケミストリー 海洋地化学
- 海洋学 海洋学とは
- 環境科学 環境科学
背景:
- 大陸の縁の堆積物は,海洋への元素の重要な源である.
- 海洋におけるマンガンの循環は,堆積物と水の相互作用と酸素濃度によって影響を受けます.
- マンガンの源を理解することは,海洋の化学プロフィールを解釈する上で極めて重要です.
研究 の 目的:
- カリフォルニア大陸縁の堆積物からのマンガンの流れを定量化するために.
- マンガンの流量と地下水の酸素濃度との関係を調査する.
- シェルフと斜面の堆積物流が,太平洋の溶けたマンガンの濃度を説明できるかどうかを判断する.
主な方法:
- コンチネンタル・シェルフと上部斜面の横断部分に展開されたフリー・ベーキル・ベンティック・フルーツ・チャンバーを利用した.
- マンガンの流量測定は,環境条件によって異なる環境条件下で in situ で行われます.
- マンガンの流量と溶けた酸素の濃度との関係を分析した.
主要な成果:
- 最も高いマンガンの流れは,浅い大陸棚で記録されました.
- マンガンの流量は,底水の酸素濃度が増加するにつれて線形的に減少した.
- 最低のフローは,酸素最小ゾーン (600~1000メートルの深さ) 内で観測されました.
結論:
- 大陸シェルフの堆積物から流れるマンガンの流動は,沿岸海域の濃度の上昇を十分に説明する.
- 酸素最小領域の沈殿物流は,太平洋の地下溶解マンガンの最大値を説明するのに不十分です.
- 太平洋の地下水で観測されたマンガンの最大値を説明するために,追加の源やプロセスが必要である.
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