越来越多的来自中国的溶解有机碳河运出口
Yanzi Yan1, Ronny Lauerwald2,3, Xuhui Wang1
1Institute of Carbon Neutrality, Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China.
Global change biology
|June 19, 2023
概括
中国的河流溶解有机碳 (DOC) 出口大幅增加,主要是由于水文变化. 未来的气候预测表明,DOC流动的这种趋势可能会持续下去,影响区域碳循环.
科学领域:
- 环境科学 环境科学
- 地球科学 地球科学 地球科学
- 生物地质化学生物地质化学
背景情况:
- 河流向海洋的溶解有机碳 (DOC) 运输是全球碳循环的关键,但未得到充分量化的方面.
- 中国河流DOC出口的不确定性阻碍了大气和陆地碳汇估计的准确协调.
研究的目的:
- 通过使用协调数据集和随机森林建模,量化中国各地的河流DOC流量 (FDOC) 和度 (CDOC).
- 分析FDOC和CDOC的趋势,并从2001-2015年确定它们的主要驱动因素.
主要方法:
- 对现场河流DOC测量的综合数据库的协调.
- 随机森林模型的应用,以每月量化中国各地的CDOC和FDOC.
- 统计分析以确定趋势和空间时间变化的归因.
主要成果:
- 在2001-2015年期间,平均CDOC为2.25 ± 0.45 mg/L,平均FDOC为4.04 ± 1.02 Tg/年.
- 观察到FDOC (+0.044 Tg/year2) 的显著增加,而CDOC在全国范围内变化很小.
- 水文被确定为时空变化的主要驱动因素,尽管人类活动在长江和河流域显著增加了CDOC.
结论:
- 该研究为中国提供了第一个全面的月度DOC建模,揭示了河流DOC出口的显著增长趋势.
- 水文变化是增加DOC流量的主要驱动因素,预计更潮湿的气候可能会维持这一趋势.
- CDOC趋势的区域变化与水文变化和直接的人为影响有关,突出显示了复杂的区域碳动态.
相关概念视频
Bioremediation
19.2K
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.
19.2K
Primary Production
23.7K
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.
23.7K
The Carbon Cycle
38.7K
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.
38.7K


