永久冻土
地下水
热岩溶
环境科学
北极的
地下水补给
湿地
地下水排放
水文学(农业)
降水
温室气体
冻土带
作者
Carolina Olid,Valentí Rodellas,Gerard Rocher-Ros,Jordi Garcia-Orellana,Marc Diego-Feliu,Aaron Alorda-Kleinglass,David Bastviken,Jan Karlsson
标识
DOI:10.1038/s41467-022-31219-1
摘要
Abstract Lateral CH 4 inputs to Arctic lakes through groundwater discharge could be substantial and constitute an important pathway that links CH 4 production in thawing permafrost to atmospheric emissions via lakes. Yet, groundwater CH 4 inputs and associated drivers are hitherto poorly constrained because their dynamics and spatial variability are largely unknown. Here, we unravel the important role and drivers of groundwater discharge for CH 4 emissions from Arctic lakes. Spatial patterns across lakes suggest groundwater inflows are primarily related to lake depth and wetland cover. Groundwater CH 4 inputs to lakes are higher in summer than in autumn and are influenced by hydrological (groundwater recharge) and biological drivers (CH 4 production). This information on the spatial and temporal patterns on groundwater discharge at high northern latitudes is critical for predicting lake CH 4 emissions in the warming Arctic, as rising temperatures, increasing precipitation, and permafrost thawing may further exacerbate groundwater CH 4 inputs to lakes.
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