Summer hydrophysical properties of thermokarst lakes in the Central Yakutian Lowland and mountain lakes in the Verkhoyansk Mountain Range in Eastern Yakutia

This dataset presents the assessment of the lake types and settings together with the data on hydrophysical parameters measurements including Electrical Conductivity, on-site water temperature and pH, except at one lake (EN21426-2) of which electrical conductivity was measured in the Hydrochemical Laboratory of AWI). Lakes were surveyed between 6 August and 2 September 2021. A total of 66 lakes in Central and Eastern Yakutia were assessed as part of the joint Russian-German expedition (NEFU-AWI; RU-Land_2021_Yakutia). Of those 66 lakes, 15 are from mountain lakes located within the Verkhoyansk mountain range, at the eastern end of the expedition route, including mostly intermontane basin or glacial lakes (average elevation: c. 1080 m a.s.l.). 13 lakes were sampled in Oymyakonsky District and two lakes in Tomponsky District. The hydrochemical dataset from the other 52 lakes that lie within the eastern extent of the Central Yakutian Lowland (average elevation: c. 190 m a.s.l.) represents thermokarst lakes. Thermokarst lakes originate from thawing of ice-rich permafrost and were found in different stages of their development, with a wide range of anthropogenic impact. These 52 thermokarst lakes include seven lakes within the Churapchinsky District, two are located in the Tattinsky District further east within a freshly burned forest. 42 lakes are located in Megino-Kangalassky District, of which 17 lakes are around Tungulu, and 24 lakes around Maya settlements.

本数据集针对湖泊类型与环境背景开展评估，并收录了多项水物理参数测量数据，包括电导率（Electrical Conductivity）、现场水温及pH值；仅EN21426-2号湖泊除外，其电导率在AWI水化学实验室完成测定。
本次湖泊调查于2021年8月6日至9月2日期间开展，作为俄德联合科考项目（NEFU-AWI; RU-Land_2021_Yakutia）的一部分，研究团队对雅库特中部与东部地区共计66处湖泊开展了评估。
上述66处湖泊中，15处为位于科考路线东端的维尔霍扬斯克山脉内的山地湖泊，多为山间盆地湖或冰川湖，平均海拔约1080米。其中13处湖泊采样自奥伊米亚康区，2处采自汤波姆斯基区。
本数据集同时收录了剩余52处湖泊的水化学数据集，这些湖泊均位于雅库特中部低地东部区域，平均海拔约190米，均为热融喀斯特湖（thermokarst lakes）。
此类湖泊由富含冰的永久冻土融化形成，处于不同发育阶段，且受人为活动影响程度差异显著。
该52处热融喀斯特湖中，7处位于丘拉普钦斯基区，2处位于更东侧的塔京斯基区一片新近过火的林区内；另有42处湖泊位于梅吉诺-坎加拉瑟基区，其中17处分布于通古卢周边，24处分布于玛雅定居点周边。