まとめ
赤道太平洋のガスの水銀は,より涼しく,栄養豊富な水域で最も高い. この海域は,大気中に大量に水銀蒸気を放出しており,人類による排出量に匹敵する可能性がある.
科学分野:
- 環境化学 環境化学
- 海洋学 海洋学 海洋学
- 大気科学 大気科学
背景:
- 水銀は,大気と海洋の重要な成分を持つ持続的な環境汚染物質です.
- 水銀の空気と海の交換を理解することは,世界的な水銀予算の評価に不可欠です.
- 赤道太平洋は,海洋と大気の相互作用と生地化学のサイクルにとって重要な地域である.
研究 の 目的:
- 赤道太平洋の大気と地表水の間のガス状水銀の分割を定量化するために.
- 赤道太平洋の地表水域における水銀濃度に影響を与える要因を特定する.
- 太平洋赤道から大気圏への水銀の流れを推定する.
主な方法:
- 表面水中の溶けたガス状水銀のフィールド測定.
- 水温と栄養素濃度の分析.
- 水銀の飽和度と予想された空気海フルースの計算.
主要な成果:
- 溶けたガス状水銀の濃度が最も高いのは,より涼しく,栄養価の高い上流地帯で見つかりました.
- 地表水は元素水銀に関して過飽和していた.
- この地域では,大気圏への元素水銀の大量流出が予測されています.
結論:
- 赤道太平洋の上流は,地表水中の高濃度の水銀を駆動しています.
- 赤道太平洋からの水銀の海洋流出はかなり大きい.
- 特にこの地域から発生する世界的な海洋水銀排出量は,人為的な資源と競合する可能性がある.
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