地下水释放CO2到全球多样化的沿海生态系统
Aprajita S Tomer1, Tristan McKenzie1, Claudia Majtényi-Hill1
1Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden.
Science advances
|January 10, 2025
概括
海底地下水排放 (SGD) 将大量的二氧化碳 (CO2) 释放到沿海水域. 这种以前被低估的二氧化碳来源,由潮周期驱动,对于理解海洋碳预算至关重要.
科学领域:
- 环境科学 环境科学
- 海洋化学 海洋化学
- 地质化学 地质化学
背景情况:
- 沿海生态系统是海洋碳预算的重要组成部分.
- 关于这些系统中二氧化碳 (CO2) 的来源和流动存在重大不确定性.
- 海底地下水排放 (SGD) 是一个潜在的,但未得到量化的,对沿海碳动态的贡献者.
研究的目的:
- 调查从SGD向浅层沿海生态系统释放二氧化碳的时间,位置和机制.
- 量化SGD衍生的二氧化碳对整个沿海碳流的贡献.
- 评估潮和潮周期对沿海水域二氧化碳丰富的影响.
主要方法:
- 在全球40个不同的沿海系统中对溶解的二氧化碳和-222 (Rn,地下水标记器) 进行了时间序列观测.
- 分析了来自红树林,盐沼,潮平面,河口和运河的数据,以捕捉一系列的沿海环境.
- 将地下水中的二氧化碳度与表面海水进行比较,以确定丰富系数.
主要成果:
- 地下水中二氧化碳的平均部分压力是表面海水的35倍.
- 平均SGD衍生的二氧化碳流量为每平方米每天148 ± 226毫摩尔 (mmol m-2 day-1).
- 潮周期被确定为大多数研究的生态系统中二氧化碳丰富的主要驱动因素.
结论:
- 海底地下水排放是对浅层沿海生态系统的重要二氧化碳来源.
- 来自SGD的二氧化碳流量对沿海地区的总体水空气二氧化碳交换做出了重大贡献.
- 准确的海洋碳预算需要将SGD作为一个关键的二氧化碳来源.
更多相关视频
07:32Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
Published on: June 4, 2021
5.1K
05:58Author Spotlight: Advancing Coral Culture - Creating a Semi-Quantitatively Controlled Microenvironment System to Counter Current Limitations
Published on: July 21, 2023
1.7K
相关概念视频
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
The Sulfur Cycle
43.7K
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...
43.7K
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
Bioremediation
18.2K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.2K
Carbon Dioxide Transport in the Blood
1.6K
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...
1.6K
What are Biogeochemical Cycles?
31.0K
The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
31.0K
