溶解有机物流量调节的输入燃料来自一个大型超的湖的二氧化碳排放量
Mingrui Qian1, Yongqiang Zhou2, Lei Zhou3
1Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 211135, China.
Water research
|January 5, 2025
概括
河流溶解有机物 (DOM) 的投入对太湖的二氧化碳 (CO2) 排放产生重大影响. 这种陆地DOM的退化,受水化学和流入动态的影响,推动了湖泊CO2的变化.
科学领域:
- 环境化学环境化学
- 临界技术 临界技术
- 生物地质化学生物地质化学
背景情况:
- 进入湖泊的陆地溶解有机物 (DOM) 可以降解为CO2.
- 关于DOM成分与湖泊二氧化碳排放之间的长期联系的研究有限.
- 太湖的DOM受农业和城市化水域的河流输入的影响.
研究的目的:
- 研究水化学和DOM特征如何影响太湖二氧化碳的变化.
- 评估流入排放动态对湖泊pCO2的影响.
- 了解陆地DOM在湖泊碳循环中的作用.
主要方法:
- 长期季节性观测 (2000-2022) 的水化学和DOM.
- 年平均面积二氧化碳流量 (FCO2) 的估计.
- 超高分辨率质谱 (FT-ICR MS) 用于DOM组合分析.
- 化实验以评估DOM降解和二氧化碳的产生.
主要成果:
- 年平均二氧化碳流量 (FCO2) 估计为470 ± 107 gCO2 m−2 yr−1.1.
- 在2004-2007年观察到FCO2的升高,峰值在2月,最低在8月.
- 西北河流DOM,包括土壤液和废水,与更高的FCO2相关.
- 二氧化碳度与DOM中大量的陆地衍生冷凝芳香化合物有关.
- 证实DOM降解是有氧CO2产生的来源.
结论:
- 河流的有机物输入是太湖二氧化碳排放的关键驱动因素.
- 输入-排放动态调节DOM对CO2流量的影响.
- DOM的组成,特别是凝结的芳香化合物,会影响二氧化碳的变化.
- 过去二十年来,太湖二氧化碳排放量是由陆地DOM退化造成的.
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