没有碳中和目标的国家的贡献,以限制全球变暖
Jiaxin Zhou1, Wei Li2,3, Philippe Ciais4
1Department of Earth System Science, Ministry of Education Key Laboratory for Earth System Modeling, Institute for Global Change Studies, Tsinghua University, Beijing, China.
Nature communications
|January 8, 2025
概括
在非碳中立国家的碳捕获和储存 (BECCS) 生物能源可以消除大量的CO2. 这项技术为全球气候减缓努力提供了关键的降温效应.
科学领域:
- 气候科学 气候科学
- 环境科学 环境科学
- 地球系统科学 地球系统科学
背景情况:
- 碳捕获和储存 (BECCS) 的生物能源是减缓气候变化的关键负排放技术.
- 非碳中和 (非CN) 国家是部署BECCS的潜在候选人.
- 了解BECCS在这些国家的全球影响对于有效的气候战略至关重要.
研究的目的:
- 通过BECCS.分析非CN国家的气候缓解贡献.
- 量化BECCS在这些地区的潜在二氧化碳去除和冷却效应.
- 评估非CN国家在不同气候场景中的作用.
主要方法:
- 利用一个具有明确生物能源作物表示的地球系统模型.
- 在低温和超标情景下,非CN国家模拟的交换草种植.
- 量化大气二氧化碳的去除以及由此产生的生物地化学和生物物理气候影响.
主要成果:
- 在非CN国家种植交换草可以消除9.1 ± 2.8 PgC (低温) 和19.9 ± 5.2 PgC (过量) 的大气CO2.
- 在这些国家,BECCS会产生0.01±0.04到0.02±0.06°C的额外的生态化学冷却效应.
- 冷却效应被生物物理变暖部分抵消,但却导致净冷却,非CN国家在低变暖情景中更为关键.
结论:
- 非CN国家通过BECCS在全球气候减缓方面发挥了重要,尽管复杂的作用.
- 在这些国家,BECCS的净降温效应强调了它们在实现气候目标方面的重要性.
- 为了最大限度地提高气候效益,对BECCS部署的协调全球方法至关重要.
相关概念视频
Global Climate Change
24.2K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.2K
The Carbon Cycle
37.0K
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.
37.0K
Energy Budgets
9.2K
Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
9.2K
Acceleration due to Gravity on Other Planets
4.1K
The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
4.1K
Limiting Reactant
58.4K
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in reality, the reactants are not always present in the stoichiometric amounts indicated by the balanced equation.
58.4K
Acceleration due to Gravity on Earth
10.6K
According to Newton's law of gravitation, the gravitational force on a body is proportional to its mass. According to Newton's second law of motion, the acceleration produced by an external force is inversely proportional to the force. Hence, the acceleration of an object under an external force of gravitation is independent of its mass.
The acceleration of an object close to the Earth, because of the Earth's gravitational pull, is called the acceleration due to gravity. It is...
The acceleration of an object close to the Earth, because of the Earth's gravitational pull, is called the acceleration due to gravity. It is...
10.6K


