カリフォルニアの流動系における海洋酸化の急速な進行
Nicolas Gruber1, Claudine Hauri, Zouhair Lachkar
1Environmental Physics, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, Zürich, Switzerland. nicolas.gruber@env.ethz.ch
まとめ
カリフォルニアの流動系では,海洋酸化が急速に進行しています. 海岸付近の水域は2050年までに全年不飽和状態に陥り,海洋生態系を脅かすことになる.
科学分野:
- 海洋化学 海洋化学について
- 海洋学 海洋学とは
- 気候変動の影響は,気候変動の影響です.
背景:
- カリフォルニアの流動系 (California Current System,California CS) は低炭酸飽和状態を示し,海洋酸化に対する脆弱性を高めています.
- 既存の条件により,近岸水域は,特にpH値と炭酸塩飽和度のさらなる低下に敏感になります.
研究 の 目的:
- カリフォルニアCSにおける海洋酸化の将来の発展を調査する.
- 2050年まで,異なる排出シナリオ (A2およびB1) による影響を予測する.
主な方法:
- 渦巻解像度のモデルシミュレーションを使用しました.
- アラゴニット飽和度 (Ωarag) の予測変化を分析した.
主要な成果:
- アラゴナイトの飽和度 (Ωarag) は,A2シナリオとB1シナリオの両方で急速に低下すると予測されています.
- 海岸付近地域の大部分は30年以内に夏にわたる不飽和状態を経験するでしょう.
- 2050年までに,水域の半分以上は,年中不飽和になり,海底生息地は20〜30年以内にこの状態にさらされます.
結論:
- 予測される海洋酸化は,カリフォルニアのCS生態系に重大な脅威をもたらす.
- Ωaragの急速な減少は,この地域の海洋生物にとって重要な未来を示しています.
- 緊急の緩和戦略は,予測される変化の深刻さによって暗示されています.
関連する概念動画
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.
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 Carbon Cycle
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
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...
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...
Carbon Dioxide Transport in the Blood
Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...


