まとめ
世界中のほとんどの湖は,吸収するよりも多くの二酸化炭素 (CO2) を放出し,大気中のCO2の重要な源として機能しています. 湖から排出される二酸化炭素の流出は,炭素循環の重要な要因である.
科学分野:
- 環境科学 環境科学
- 地質化学 地質化学
- リムテクノロジーとは
背景:
- 湖は,世界の炭素循環において重要な役割を果たしています.
- 湖面水と大気間のガス交換を理解することは,正確な気候モデリングに不可欠です.
研究 の 目的:
- 湖の表面水中の二酸化炭素 (CO2) の地球部分圧力を定量化するために.
- 湖が,大気中のCO2の純源または吸収源として機能するかどうかを判断する.
- 湖が世界の炭素予算に与える貢献度を評価する.
主な方法:
- 世界1835の湖から採取された4665個の地表水のサンプルを分析した.
- 湖水中の二酸化炭素 (CO2) の部分圧力測定.
- 湖のCO2部分圧力と大気平衡の比較.
主要な成果:
- 分析された湖のサンプルの87%は,大気相対のCO2で過飽和していた.
- 湖内のCO2の平均部分圧力は大気圧の約3倍でした.
- 湖は大気中のCO2の純源であり,推定の世界的な排出量は年間0.14 x 10^15グラムの炭素である.
結論:
- 湖は,大気中のCO2の重要な源であり,シンクではない.
- 湖から排出される二酸化炭素の排出量は,河川が海に排出する二酸化炭素の排出量と同等に相当する.
- 湖は,地球上の貯水池から大気中の貯水池への炭素の転送の重要な,しかししばしば過小評価されている経路を表しています.
さらに関連する動画
10:28Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
Published on: June 13, 2020
07:32Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
Published on: June 4, 2021
関連する概念動画
Freshwater Microbial Ecology
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...
Gas Solubility
Gas solubility in liquids forms liquid-gas solutions, such as soft drinks, where carbon dioxide is dissolved in water, and the ocean, where the solubility of oxygen and carbon dioxide supports marine life. The ability of oceans to dissolve gases impacts weather conditions in the troposphere.However, gas-liquid interactions vary. For instance, hydrogen chloride gas is highly soluble in water, while oxygen's solubility is much lower. Because these solutions are non-ideal, Raoult’s law, which...
Phase Diagrams
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
Solution Equilibrium and Saturation
Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
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...
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.
