海洋のロスビー波は,生態系に浮かぶ副産物の"ヘイレイク"として作用します
Yves Dandonneau1, Andres Vega, Hubert Loisel
1IRD, IPSL/Laboratoire d'Océanographie Dynamique et de Climatologie, 75252 Paris 05, France. yd@lodyc.jussieu.fr
Science (New York, N.Y.)
|December 4, 2003
まとめ
ロスビー波は,クロロフィールだけでなく,浮遊粒子を温かい海洋収束に集約する. この"海洋ヘイレイク"効果は,栄養素が少ない水域での生命の分布に影響を与えます.
科学分野:
- 海洋学 海洋学 海洋学
- 海洋生態学 海洋生態学とは
- サテライト海洋学.
背景:
- 衛星観測では,亜熱帯回転におけるロスビー波とクロロフィルの異常を示している.
- 以前の仮説では,波によって引き起こされる上流が光合成を刺激することを示唆していた.
研究 の 目的:
- サブトロピカル回転における海色の異常の原因を調査する.
- クロロフィールやその他の粒子が観測された異常の原因であるかどうかを判断する.
- ロスビー波動学の生態学的意味を理解するために.
主な方法:
- ロスビー波とクロロフィルの衛星データ分析.
- 塩素フィール最大値と海面温度,波の収束地帯の相関.
- 海洋収束における粒子蓄積の生態学的解釈.
主要な成果:
- クロロフィルマキシマムは,ロスビー波誘発コンバージェンス内の異常な温水で発見されました.
- これらの場所では,より深い水域からの栄養素の輸入は除外され,上流の仮説に異議を唱えました.
- 海の色異常は,クロロフィルのみではなく,蓄積された浮遊粒子に起因する.
結論:
- ロスビーの波は"海上ヘインレイク"として作用し,生態系由来の浮遊粒子を収束地帯に集約する.
- 栄養素の直接的な上流ではなく,この粒子の蓄積が,観測された海色異常を説明しています.
- これらの物理生物学的相互作用は,オリゴトロフ性海洋環境における生命の構造化に極めて重要です.
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