永久冻土融化引发的酸性渗流释放有毒金属进入加拿大育空地区溪流

Abrupt stream acidification and metal mobilization from permafrost degradation Elliott K. Skierszkan1,2*, Andras J. Szeitz3, Matthew B.J. Lindsay2, Sean K. Carey3 Here, we describe abrupt ARD onset in small (<40 km2) permafrost- underlain headwater catchments of the Yukon and Mackenzie river basins. Our hydrological and geochemical dataset captures precipitous declines in water quality toward highly acidic levels (pH <4) and acutely toxic metal concentrations in a <5- year period. We further link this trend to broader regional acceleration of SMO in receiving rivers of the Yukon and Mackenzie basins. Thawing permafrost- underlain headwater catchments emerge as biogeochemical reactors that export metals, sulfur, and carbon back into active hydrological and biogeochemical cycles, unveiling a growing environmental risk in a warming cryosphere. …