南大洋的冬季CO2来源被大大低估了
Siqi Zhang1,2, Peng Chen1,2, Kelsey Bisson3
1State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, 36 Bochubeilu, Hangzhou 310012, China.
Science advances
|November 5, 2025
概括
南大洋的碳流被低估了,尤其是在冬季. 新的方法揭示了由度和气候模式影响的复杂二氧化碳排放和吸收模式.
科学领域:
- 海洋学 海洋学 海洋学
- 气候科学 气候科学
- 生物地质化学生物地质化学
背景情况:
- 南洋碳流对于全球碳循环至关重要,但由于冬季数据有限,碳流仍然不确定.
- 准确评估二氧化碳交换对于气候建模和了解海洋在碳捕获中的作用至关重要.
研究的目的:
- 通过使用综合卫星和机器学习数据,从2007年到2020年量化南洋空海二氧化碳流.
- 为了确定控制不同度区域的二氧化碳流动的关键驱动因素.
- 提高对影响南大洋碳预算的冬季过程的理解.
主要方法:
- 整合卫星光探测和测距 (LIDAR) 测量与机器学习算法.
- 分析空气-海二氧化碳部分压差 (ΔpCO2) 和风驱动的转移速度.
- 开发一个三度循环框架来解释pCO2控制.
主要成果:
- 在之前的研究中,南北50度以南的二氧化碳排气被低估了高达40%.
- 中度南洋充当更强的碳汇,而高度则表现出由南方环状模式 (SAM) 调节的可变吸收/排气.
- 空气-海二氧化碳部分压差 (ΔpCO2) 是流动变化的一个比风速更主要的因素.
结论:
- 冬季过程在南大洋的碳循环中起着至关重要的作用,需要全年观测.
- 对pCO2的截然不同的度控制 (南极洲的盐度/海冰,极地前线的大气CO2/叶绿素,亚极地区的SST/CO2) 控制碳流.
- 经过修订的估计强调了南大洋对全球碳循环的重大,以前被低估的贡献.
更多相关视频
10:28Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
Published on: June 13, 2020
6.3K
07:32Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
Published on: June 4, 2021
5.7K
相关概念视频
Global Climate Change
28.7K
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.
28.7K
The Carbon Cycle
43.1K
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.
43.1K
Primary Production
25.0K
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.
25.0K
Carbon Dioxide Transport in the Blood
4.5K
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...
4.5K
Carbon-dioxide Fixation
617
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
617
Oxygenic Photosynthesis
695
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
695
