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在西伯利亚 (杜瓦尼亚尔) 侵蚀的耶多马永久土遗址的温室气体排放和侧向碳动力学

Kirsi H Keskitalo^1,2, Lisa Bröder^2,3, Dirk J Jong²

¹Department of Geography and Environmental Sciences, Northumbria University, Newcastle Upon Tyne, UK.

Global change biology

|February 14, 2025

概括

北极永久土的融化会释放大量的碳进入水道. 融化流排放的二氧化碳比河流的二氧化碳更多,突出了从降解永久土加速气候变化的风险.

科学领域:

环境科学环境科学
地质化学地质化学
气候科学气候科学

背景情况:

北极地区的变暖加快了永久土的融化,将古老的有机碳释放到水生系统中.
突如其来的融化事件,如侵蚀和暴跌,其频率正在增加,并暴露了富含碳的永久土.
这些过程可能导致微生物降解和温室气体排放,放大气候变化.

研究的目的:

量化来自于永久土突然融化的融化流水的温室气体排放量.
为了比较融化流的排放量与它们流入科利马河的排放量.
了解这些独特的水生环境的生物地质化学特征.

主要方法:

化流和河水样本的化实验.
测量二氧化碳 (CO2) 和甲 (CH4) 的排放量.
分析水的生物地质化学,包括悬浮沉积物和溶解的有机碳.

主要成果:

与河流外流相比,解流的体积二氧化碳排放量较高.
对沉积物重量正常化的二氧化碳释放在河流外流中比在融化流中更大.
在融化流和河流流出时,CH4排放量相似,并且明显低于CO2排放量.
靠近海岸的河岸水域显示出明显的生物地化学特性,与主要河道相比,溶解的有机碳损失更快.

结论:

永久土的融流是温室气体的重要来源,特别是二氧化碳.
融化流的独特生物地质化学影响碳循环和降解速度.
这些发现提供了关于北极河流系统中永久土融化的气候反潜力的关键见解.

关键词:

CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH5 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH4 CH5 CH4 CH4 CH4 CH4 CH4 CH4 CH4 是一个人可能是什么意思是什么意思是什么意思是什么意思二氧化碳二氧化碳二氧化碳化时间化时间河岸侵蚀河岸侵蚀

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