Abstract. Lakes in permafrost regions are dynamic landscape components and play an important role for climate change feedbacks. Lake processes such as mineralization and flocculation of dissolved organic carbon (DOC), one of the main carbon fractions in lakes, contribute to the greenhouse effect and are part of the global carbon cycle. These processes are in focus of climate research but studies so far are limited to specific study regions. In our synthesis, we analysed 2,167 water samples from 1,833 lakes across the Arctic in permafrost regions of Alaska, Canada, Greenland, and Siberia to provide first pan-Arctic insights for linkages between DOC concentrations and the environment. Using published data and unpublished datasets from the author team we report regional DOC differences linked to latitude, permafrost zones, ecoregions, geology, near-surface soil organic carbon contents, and ground ice classification of each lake region. The lake DOC concentrations in our dataset range from 0 mg L⁻¹ to 1,130 mg L⁻¹ (10.8 mg L⁻¹ median DOC concentration). Regarding the permafrost regions of our synthesis, we found median lake DOC concentrations of 12.4 mg L⁻¹ (Siberia), 12.3 mg L⁻¹ (Alaska), 10.3 mg L⁻¹ (Greenland), and 4.5 mg L⁻¹ (Canada). Our synthesis shows a significant relationship of lake DOC concentration and ecoregion of the lake. We found higher lake DOC concentrations in boreal permafrost sites compared to tundra sites. About 22 % of the lakes in our extensive dataset are located in regions with ice-rich syngenetic permafrost deposits (yedoma). Yedoma contains large amounts of easily erodible organic carbon and we found significantly higher DOC concentrations in yedoma lakes compared to non-yedoma lakes. Compared to previous studies we found a weak significant relationship of soil organic carbon content and lake DOC concentration as well as between ground-ice content and lake DOC. Our pan-Arctic dataset shows that the DOC concentration of a lake strongly depends on its environmental properties, especially on permafrost extent and ecoregion, as well as vegetation, which is the most important driver of lake DOC in this study. This new dataset will be fundamental to quantify a pan-Arctic lake DOC pool for estimations of the impact of lake DOC on the global carbon cycle and climate change.

中文翻译：

---

永久冻土区湖泊中溶解有机碳的首次泛北极评估

摘要。多年冻土区的湖泊是动态景观成分，在气候变化反馈中起着重要作用。湖泊过程，例如矿化和溶解有机碳（DOC）的絮凝（DOC是湖泊中的主要碳组分之一），对温室效应有贡献，并且是全球碳循环的一部分。这些过程是气候研究的重点，但到目前为止，研究仅限于特定的研究区域。在我们的综合研究中，我们分析了阿拉斯加，加拿大，格陵兰和西伯利亚多年冻土区中横跨北极的1,833个湖泊的2,167个水样，从而为DOC浓度与环境之间的联系提供了第一个泛北极见解。利用作者团队发布的数据和未发布的数据集，我们报告了与纬度，多年冻土带，生态区，地质，表层土壤的有机碳含量，以及每个湖泊区域的地冰分类。我们数据集中的湖泊DOC浓度范围为0 mg L^-1至1,130 mg L ^-1（10.8 mg L ^-1中位数DOC浓度）。关于我们合成的多年冻土区域，我们发现湖泊DOC的中位数浓度为12.4 mg L ^-1（西伯利亚），12.3 mg L ^-1（阿拉斯加），10.3 mg L ^-1（格陵兰）和4.5 mg L ^-1（加拿大）。我们的综合表明，湖泊DOC浓度与湖泊生态区之间存在显着关系。我们发现与冻土带相比，北方多年冻土带中的湖泊DOC浓度更高。在我们广泛的数据集中，约有22％的湖泊位于富含冰的同生多年冻土沉积的地区（yedoma）。Yedoma含有大量易于腐蚀的有机碳，我们发现与非Yedoma湖相比，Yedoma湖中的DOC浓度明显更高。与以前的研究相比，我们发现土壤有机碳含量与湖泊DOC浓度之间以及地冰含量与湖泊DOC之间的弱显着关系。我们的全北极数据集显示，湖泊中的DOC浓度很大程度上取决于其环境特性，尤其取决于多年冻土的程度和生态区以及植被，这是本研究中DOC湖最重要的驱动力。这个新的数据集将是量化泛北极DOC池的基础，用于估算DOC对全球碳循环和气候变化的影响。