関連する実験動画
Updated: Jul 11, 2026

09:33
An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium
Published on: December 17, 2018
まとめ
赤道太平洋の上流は,大気中の水銀濃度を大幅に上昇させる. この海洋での水銀逃逸は,生物学的活動の増加と関連しており,海洋水銀源のモデルをサポートしています.
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,複雑な環境経路を持つ世界的な汚染物質です.
- 海洋環境は,大気中の水銀のシンクとソースの両方として機能することができます.
- 海洋における水銀逃避の理解は,世界の水銀予算の評価に不可欠です.
研究 の 目的:
- 太平洋の赤道部の海洋プロセスと大気中の水銀濃度との関係を調査する.
- 赤道上流が,海洋から大気への水銀の逃れに影響を与えているかどうかを判断するために.
- 海洋から空気への水銀の移転における生物学的生産の役割を評価する.
主な方法:
- 赤道太平洋 (160°W) の全気体水銀 (TGM) の大気サンプル採取.
- 海面の温度と栄養素濃度のモニタリングにより,上流地帯を特定する.
- 表面海水における活性水銀濃度を測定する.
主要な成果:
- 太平洋赤道 (4°Nから10°S) で大気TGMの有意な増加が観察されました.
- 大気TGMの強化は,海面の上昇指標 (温度,栄養素) と相関しています.
- 大気中の高濃度の水銀と,地表水中の活性水銀との関連性を発見した.
結論:
- 赤道上流と生物学的生産の強化によって引き起こされる海洋の水銀逃避は,大気中の水銀の重要な源である.
- 赤道太平洋は,大気中の水銀の源として作用し,モデル予測をサポートします.
- 海洋由来水銀の排出は,他の生物学的生産性のある海洋地域でも発生する可能性が高い.
関連する概念動画
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...
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.
The Periodic Table and Organismal Elements
Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
Periodic Table Provides Information...
Periodic Table Provides Information...
The Periodic Table and Organismal Elements
Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally-occurring, and fewer still are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.The Periodic Table Provides Information about...
Microbes and Climate Change
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
