Thermokarst lakes form following the thaw of ice‐rich permafrost and drain after a few decades to millennia. Drained thermokarst lake basins (DTLBs) become epicenters for peat accumulation and re‐aggradation of ice‐rich permafrost. This re‐aggradation of permafrost may be interrupted by subsequent thermokarst lake formation with sufficient disturbance. Thermokarst lakes and DTLBs are abundant near Old Crow, Yukon, Canada, but little is known about their evolution through the Holocene. In this study, we investigate the hydrology and drainage histories of seven DTLBs from the Old Crow Flats on the basis of cryostratigraphy, radiocarbon dating, and pore‐ice δ¹⁸O and δ²H records. Cryostratigraphic evidence implies only one of the seven studied DTLBs underwent multiple thermokarst cycles. Radiocarbon age–depth models demonstrate a slowdown in the rate of post‐drainage peat accumulation with time. Pore‐ice isotope analyses reveal a spectrum of possible post‐drainage isotopic histories resulting from spatial variability in permafrost, vegetation, and hydrology. Unlike lacustrine silt, post‐drainage peat contains relatively constant pore‐ice isotope trends. In light of our findings, we propose that syngenetic peat permafrost in DTLBs preserve a warm‐season sampling of local meteoric waters. These pore‐ice δ¹⁸O and δ²H records may aid millennial‐scale paleoclimate investigations, as we demonstrate through our reconstruction of Holocene climate change in northern Yukon.

中文翻译：

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来自加拿大育空地区旧乌鸦屋地热喀斯特湖盆地排水的全新世孔隙冰δ18O和δ2H记录

几十年来一直到数千年之后，富含冰的多年冻土融化并流失后，形成了喀斯特喀斯特湖。流失的喀斯特喀斯特湖盆地（DTLB）成为泥炭堆积和富冰永久冻土再凝结的震中。多年冻土的这种再凝结可能被随后的热喀斯特湖的形成和足够的干扰所中断。在加拿大育空地区的老乌鸦附近，地热岩溶湖和DTLB丰富，但对它们通过全新世的演化了解甚少。在这项研究中，我们调查的距离老乌鸦平底鞋7个DTLBs水文和排水的历史cryostratigraphy，放射性碳测年，和孔隙冰的基础上δ ¹⁸ O和δ ²H记录。冷冻地层学证据表明，研究的七个DTLB中只有一个经历了多次热岩溶循环。放射性碳年龄深度模型表明，排水后泥炭积累的速度随时间而减慢。孔隙同位素分析揭示了由于多年冻土，植被和水文学的空间变化而引起的一系列排水后同位素历史。与湖泊淤泥不同，排水泥炭包含相对恒定的孔隙冰同位素趋势。根据我们的发现，我们建议在DTLB中的同质泥炭永久冻土保持局部流域水域的暖季采样。这些孔冰δ ¹⁸ O和δ ²H记录可能有助于千年规模的古气候调查，正如我们通过重建育空北部北部全新世气候变化所证明的那样。