メソスケール渦は,亜熱帯太平洋のシリカの輸出を増加させます
Claudia R Benitez-Nelson1, Robert R Bidigare, Tommy D Dickey
1Department of Geological Sciences and Marine Science Program, University of South Carolina, Columbia, SC 29208, USA. cbnelson@geol.sc.edu
まとめ
メソスケール渦は海洋原産物を増加させるが,炭素輸出効率を向上させない. 代わりに,これらの渦は選択的なシリカポンプとして作用し,海洋の生地化学に影響を与えます.
科学分野:
- 海洋学 海洋学 海洋学
- マリン・バイオジオケミストリー
- 生物海洋学 生物海洋学
背景:
- メソスケール渦は海洋の生地化学的サイクルに影響を与えます.
- 渦は,栄養素が限られた水域での栄養素供給と一次生産を増やすことができます.
- 生物学的なポンプの効率 (原産物に炭素の輸出) は,炭素の結合に極めて重要です.
研究 の 目的:
- 冷酷なサイクロンの渦がダイアトムの開花に及ぼす影響を調査するために.
- 渦が初次生産,コミュニティのバイオマス,炭素輸出効率にどのように影響するか評価する.
- 渦が海洋の生地化学と生物学的ポンプにおける役割を理解する.
主な方法:
- 冷酷なサイクロン渦の中でダイアトムの開花のフィールド研究.
- 初等生産,コミュニティのバイオマス,およびサイズ組成の分析.
- 炭素輸出比率と生物学的ポンプの機能の評価.
主要な成果:
- エディの原産物生産とコミュニティのバイオマスが大幅に増加しました.
- 渦の中のダイアトムの開花は,バイオマスの増加とサイズ組成の変化を示した.
- 炭素輸出比率は,渦によってほとんど影響を受けなかった.
- 渦巻システムは,選択的なシリカポンプとして機能した.
結論:
- メソスケール渦は,一次生産を向上させるが,必ずしも炭素輸出効率を向上させるわけではない.
- 強いトロフィックカップリングと非効率的な有機輸出は,温暖な太平洋の水域の混乱したコミュニティの特徴です.
- 渦は,選択的なシリカポンプとして作用し,栄養素の循環と生地化学的プロセスに影響を与える可能性があります.
関連する概念動画
Marine Microbial Ecology
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
The Sulfur Cycle
Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
Microbes and the Sulfur Cycle
Sulfur is a vital element in Earth's biogeochemical systems. It transitions through various inorganic states, including sulfate (SO₄²⁻), elemental sulfur (S⁰), and sulfide (S²⁻). Abiotic and biological mechanisms across oxic and anoxic environments intricately mediate these transformations. Sulfate, the most oxidized form of sulfur, is predominantly stored in rocks, marine sediments, and oceanic waters, acting as a long-term reservoir in the global sulfur cycle.In oxic environments,...
Primary Production
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
Effect of Sea Water on Concrete
Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
Concrete in areas between tide marks, which undergo...
Concrete in areas between tide marks, which undergo...
Deep Sea Microbial Ecology
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...


