The Arctic is warming at a rate twice that of other global ecosystems and changing climate conditions in the Arctic are mobilizing long frozen permafrost stores of organic carbon. In ice-rich regions, permafrost thaw on sloping terrain can cause land subsidence, and the development of thaw-driven mass wasting. The Peel Plateau, Northwest Territories, Canada has extensive thaw-driven landslides called retrogressive thaw slumps that are exposing early Holocene age paleo-thaw layers and Pleistocene age glaciogenic material deposited by the Laurentide Ice Sheet. This study aimed to see if unique retrogressive thaw slump derived permafrost inputs could be readily observed in streams across six diverse thermokarst features via optical and ultrahigh-resolution mass spectrometry. Aquatic samples from water draining thermokarst slump features, and downstream of thermokarst inputs exhibited higher dissolved organic carbon concentrations and lower aromaticity as evidenced by optical parameters (e.g. declining SUVA₂₅₄, increasing S_275-295) and FT-ICR MS metrics (e.g. lower AI_mod and nominal oxidation state of carbon) versus upstream of thermokarst impacts. Increases in the relative abundances of assigned heteroatomic molecular formulae (e.g. CHON, CHOS, CHONS) were also greater within and downstream of thermokarst features. The unique molecular formulae present in permafrost thermokarst inputs were determined (n = 1844) and subsequently tracked downstream. These permafrost marker formulae were enriched in aliphatics and H/C, as well as heteroatoms and exhibited low aromaticity. A portion of the unique molecular fingerprint persisted downstream, highlighting the potential to not only assess thermokarst inputs but also to follow these inputs and their fate downstream throughout the aquatic network.

北极变暖的速度是其他全球生态系统的两倍，北极不断变化的气候条件正在动员长期冻结的永久冻土储存的有机碳。在冰层丰富的地区，倾斜地形上的永久冻土融化会导致地面沉降，并导致融化导致的大规模浪费。加拿大西北地区的皮尔高原有大面积的解冻驱动的山体滑坡，称为倒退解冻滑坡，暴露了全新世早期的古解冻层和劳伦泰德冰盖沉积的更新世冰川形成物质。这项研究的目的是看看是否可以通过光学和超高分辨率质谱在跨越六种不同热岩溶特征的溪流中容易地观察到独特的倒退解冻滑落衍生的永久冻土输入。_{光学参数（例如 SUVA 254}下降，S _275-295增加）和 FT-ICR MS 指标（例如 AI降低）证明，来自排水热岩溶塌陷特征和热岩溶输入下游的水生样品表现出较高的溶解有机碳浓度和较低的芳香度。碳的_mod和标称氧化态）与热岩溶影响上游的关系。指定的杂原子分子式（例如CHON、CHOS、CHONS）的相对丰度的增加在热岩溶特征的内部和下游也更大。确定了永久冻土热岩溶输入中存在的独特分子式（n  = 1844），并随后对下游进行追踪。这些永久冻土标记分子式富含脂肪族化合物、H/C 以及杂原子，并且芳香性较低。独特的分子指纹的一部分持续存在于下游，凸显了不仅可以评估热喀斯特输入的潜力，而且还可以在整个水生网络下游跟踪这些输入及其命运。