南大洋の生物学的反応は,エオリア氷河期の鉄の堆積に起因した
Nicolas Cassar1, Michael L Bender, Bruce A Barnett
1Department of Geosciences, Princeton University, Princeton, NJ 08544, USA. ncassar@princeton.edu
まとめ
エアロゾールからの鉄は,南洋の輸出生産を肥やす. エアロゾール鉄の投入の増加は,特に大陸のダウンウィンドで,総初次生産と純地域生産の両方を大幅に高めます.
科学分野:
- 海洋生物ジオケミストリー
- 海洋学 海洋学 海洋学
- 環境科学 環境科学
背景:
- 南洋の生地化学プロセスは,地球環境に大きな影響を及ぼします.
- 初次生産の理解は,海洋生態系の健康と炭素循環の評価に不可欠です.
研究 の 目的:
- 南大洋の広大な地域における原産総量と地域生産純のパターンを確立する.
- エアロゾールで堆積した鉄と海洋生産率との関係を調査する.
- 輸出生産の鉄肥料化に関する証拠を強化する.
主な方法:
- バイオジオケミカルレートに関する公表されたデータと新しいデータの収集と分析.
- エアロゾールから表面水への溶けた鉄の投入のモデリング.
- 観測された生産率とモデル化された鉄堆積量の比較.
主要な成果:
- 輸出生産のプロキシであるコミュニティの純生産は,アエロゾールからモデル化された溶解鉄の輸入量と正比である.
- エアロゾール鉄の添加は,南大洋の輸出生産を明らかに肥料化する.
- 主要な総生産量は,エアロゾール鉄の投入により,乾燥した大陸の風の下の地域で特に増加しています.
結論:
- エアロゾール鉄は,南洋の輸出生産を制御する重要な要因である.
- エアロゾールによる鉄の肥料化は,海洋生態系の生産性を調節する上で重要な役割を果たします.
- この発見は,海洋生物地球化学を推進する大気堆積の重要性を強調しています.
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