Despite the importance of surface waters of permafrost landscapes in carbon (C) emission and dissolved C and metal storage and export, the majority of available observations in high latitude aquatic systems deal with punctual or seasonal sampling without accounting for diurnal variations in temperature and primary productivity-respiration cycles. Towards providing comprehensive understanding of diel variations in CO₂ emission, organic C and element concentrations in lakes of frozen peatlands, we monitored, each 2 h over 2 days, the water temperature, pH, CO₂ fluxes, CO₂, CH₄, dissolved organic and inorganic carbon (DOC and DIC, respectively), nutrients, carboxylic acids, bacterial number, and major and trace elements in two acidic (pH = 3.6 and 4.0) and humic (DOC = 15 and 35 mg L⁻¹) thermokarst lakes of discontinuous permafrost zone in Western Siberia. We discovered a factor of 2 to 3 higher CO₂ concentrations and fluxes during the night compared to daytime in the high-DOC lake. The emission fluxes in the low-DOC lake increased from zero to negative values during the day to highly positive values during the end of night and early morning. The methane concentration varied within a factor of 5 without any link to the diurnal cycle. The bulk of dissolved (< 0.45 μm) hydrochemical parameters remained highly stable with ±10% variation in concentration over 2 days of observation (DOC, DIC, SUVA_{254 nm}, carboxylates (formate, oxalate, puryvate and glutarate), Mn, Fe, Al, other trace elements). Concentrations of Si, P, K, Cu varied within ±20% whereas those of Zn and Ni ranged by a factor of 2 to 4 without any link to diurnal pattern. Overall, the impact of diel cycle on CH₄, DOC, nutrient and metal concentration was below 10%. However, neglecting night-time period may underestimate net CO₂ emission by ca. 30 to 50% in small organic-rich thaw ponds and switch the CO₂ exchange from uptake/zero to net emission in larger thermokarst lakes. Given the dominance of large lakes in permafrost regions, the global underestimation of the emission flux may be quite high. As such, monitoring CO₂ concentrations and fluxes in thermokarst lakes during months of extended night time (August to October) is mandatory for assessing the net emissions from lentic waters of frozen peatlands.

尽管多年冻土景观的地表水在碳（C）排放和溶解的C以及金属的存储和输出中非常重要，但高纬度水生系统中的大多数可用观测值都是按时或季节性采样的，没有考虑温度和初级生产力的日变化-呼吸周期。为了全面了解冻结的泥炭地湖泊中CO ₂排放，有机碳和元素浓度的diel变化，我们每2小时监测2天的水温，pH，CO ₂通量，CO ₂，CH ₄，两种有机酸（pH = 3.6和4.0）和腐殖酸（DOC = 15和35 mg L ^-1）中的溶解有机碳和无机碳（分别为DOC和DIC），营养素，羧酸，细菌数以及主要和微量元素西伯利亚西部不连续多年冻土带的喀斯特喀斯特湖。我们发现CO ₂升高了2到3倍与高DOC湖泊中的白天相比，夜间的浓度和通量有所增加。低DOC湖中的排放通量在白天从零增加到负值，在深夜和清晨逐渐增加到正值。甲烷浓度在5倍范围内变化，与昼夜循环没有任何联系。大部分溶解（<0.45μm）的水化学参数保持高度稳定，在2天的观察中浓度（DOC，DIC，SUVA _{254 nm}，羧酸盐（甲酸盐，草酸盐，丙酮酸盐和戊二酸盐），Mn，Fe， Al，其他微量元素）。Si，P，K，Cu的浓度在±20％范围内变化，而Zn和Ni的浓度范围为2-4，与昼夜模式无关。总体而言，迪尔循环对CH _4的影响，DOC，养分和金属浓度均低于10％。但是，忽略夜间可能会低估大约CO _2的净排放量。在富含有机物的小型融化池塘中增加30％至50％的水分，并将较大的喀斯特喀斯特湖中的CO ₂交换量从吸收/零转换为净排放。考虑到多年冻土区中大型湖泊的优势，全球对排放通量的低估可能很高。因此，必须在延长的夜间时间（8月至10月）中监测热岩溶湖中的CO ₂浓度和通量，以评估冻泥炭地片状水的净排放量。