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河流和溪流的全球甲排放

Gerard Rocher-Ros^1,2,3, Emily H Stanley⁴, Luke C Loken⁵

¹Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden. gerard.rocher.ros@slu.se.

|August 16, 2023

概括

河流的全球甲 (CH4) 排放量估计为每年27.9 Tg. 与湖泊不同的是,河流排放的温度依赖性很弱,受陆水连接和土壤状况的影响.

科学领域:

环境科学
气候科学
地质化学

背景情况:

甲 (CH4) 是一种强有力的温室气体,自工业革命以来大气中的度增加了三倍.
全球变暖可能会增加淡水生态系统的CH4排放量,从而产生积极的气候反循环.
然而,人们对河流和溪流中CH4排放的驱动因素和规模的了解很少.

研究的目的:

提供来自流水的CH4排放的空间明确的全球估计.
研究控制河流系统中CH4排放的因素.
将河流CH4排放量与其他淡水生态系统的排放量进行比较.

主要方法:

开发一个全球模型来估计河流的CH4排放量.
影响CH4排放的因素分析,包括温度,陆水连接和土壤状况.
河流与湖泊和湿地的CH4排放激活能量的比较.

主要成果:

河流的全球CH4排放量估计为27.9 (16.7-39.7) Tg/年,与其他淡水系统相比.
与湖泊和湿地 (E_M = 0.96 eV) 相比,河流的CH4排放具有较低的温度依赖性 (激活能量E_M = 0.14 eV).
在高度和低度地区和人类占主导地位的地区发生高排放,与有机物供应和和土壤的氧气不足有关.

结论:

陆地与水的连接对于调节河流的CH4供应至关重要.
河流的CH4排放受土壤氧化,有机物和水和的影响.
这些排放既容易受到人类的直接影响,也容易受到陆地气候变化带来的影响.

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