Climate warming and permafrost thaw have the potential to shift Arctic carbon (C) cycling dynamics so ponds, which represent over a quarter of northern circumpolar surface water area, may play a larger role in the mineralization of terrestrial C and emission of greenhouse gases (GHG). Here, we constrain how active layer detachments (ALDs) affect C cycling dynamics in High Arctic ponds (n = 19) through the examination of geochemistry, dissolved organic matter (DOM) characteristics, and dissolved GHG concentrations. Summer rainfall events were identified as the primary source of pond water over a 5 week period during the monitored thaw season. We observed two distinct geochemical and DOM composition groups in ponds surrounded by undisturbed, vegetated areas compared to ponds located within the geomorphologically-disturbed ALDs. DOM in undisturbed areas had characteristics suggesting allochthonous origin from modern vegetation. Ponds in the ALDs had lower mean dissolved organic carbon (DOC) concentrations than ponds within undisturbed landscapes, with DOM characterization suggesting greater proportions of autochthonous DOM. Observed differences in DOC concentrations and DOM composition between ponds located within the disturbed and undisturbed landscapes did not translate into significant differences in dissolved CO₂ concentrations among pond types. We conclude that our observed changes in DOM composition and characteristics in High Arctic ponds may not result in substantial increases in GHG flux as a result of continued Arctic warming.

气候变暖和永久冻土融化有可能改变北极碳 (C) 循环动力学，因此代表北极环极地表水域四分之一以上的池塘可能在陆地碳矿化和温室气体 (GHG) 排放方面发挥更大的作用）。在这里，我们限制了活动层分离 (ALD) 如何影响高北极池塘 ( n= 19) 通过对地球化学、溶解有机物 (DOM) 特征和溶解温室气体浓度的检查。夏季降雨事件被确定为监测解冻季节 5 周内池塘水的主要来源。与位于地貌受干扰的 ALD 内的池塘相比，我们在被未受干扰的植被区域包围的池塘中观察到了两个不同的地球化学和 DOM 组成组。未受干扰地区的 DOM 具有表明来自现代植被的异地起源的特征。ALD 中的池塘的平均溶解有机碳 (DOC) 浓度低于未受干扰的景观中的池塘，DOM 特征表明本土 DOM 的比例更大。₂池塘类型之间的浓度。我们得出的结论是，由于北极持续变暖，我们观察到的高北极池塘 DOM 组成和特征的变化可能不会导致温室气体通量的大幅增加。