自工业前时代以来,全球湖泊和水库的二氧化排放量增加
Ya Li1,2,3, Hanqin Tian4, Yuanzhi Yao5
1State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
Nature communications
|January 31, 2024
概括
湖泊和水库是氧化 (N2O) 的重要来源,这是一个强大的温室气体. 自工业化前时代以来,这些系统的全球排放量增加了一倍多.
科学领域:
- 环境科学 环境科学
- 气候科学 气候科学
- 地质化学 地质化学
背景情况:
- 像湖泊和水库这样的透镜系统被认为是氧化 (N2O) 主要排放热点.
- 从这些水生系统中量化N2O排放,特别是在全球范围内,仍然是一个挑战.
- 二氧化是一种强大的温室气体,对气候变化有重大影响.
研究的目的:
- 量化全球透镜系统的历史和最近的氧化 (N2O) 排放量.
- 调查环境变化对湖泊和水库N2O排放的影响.
- 评估内陆水域对全球N2O预算的贡献,并改进国家库存方法.
主要方法:
- 分析自工业化前时期以来全球镜片系统对N2O排放的环境强迫作用.
- 2010年代湖泊和水库的N2O排放量量化.
- 整合河流排放量以估计内陆水总N2O输出.
- 计算内陆水域的全球和国家一级排放因子.
主要成果:
- 全球透镜系统在2010年代排放了64.6 ± 12.1 Gg N2O-N yr−1,自1850年代以来增加了126%.
- 小型镜片系统显示出显著的N2O排放率和对陆地环境变化的反应能力.
- 在2010年代,全球内陆水域 (水上和河流) 的N2O总排放量为319.6±58.2 Gg N yr−1.
- 与农业气应用相比,全球内陆水 N2O 排放系数为 0.051%.
结论:
- 镜片系统是大气氧化的大量和不断增长的来源.
- 小水体在N2O排放中发挥着关键作用,是环境变化的敏感指标.
- 这项研究为完善国家温室气体库存和了解全球循环提供了关键数据.
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