The results of studying the dynamics of parameters of the carbonate system in the middle and lower reaches of the Ob River in July 2016 were analyzed. The distributions of the carbonate characteristics of the river waters were found to follow a steady latitudinal trend determined by the landscape-geochemical conditions of the drainage basin and by the permafrost distribution. The first field data on the magnitude and direction of the CO2 fluxes in the Ob River water–atmosphere system were presented. It was shown that the waters in the middle and lower reaches of the river are multiply supersaturated with CO2 with respect to its atmospheric content, and the daily average evasion reaches 625.9 mmol m–2 day–1 at an average value of 102.1 mmol m–2 day–1. It was determined that the waters of the Ob River in the studied reaches are a significant CO2 source to the atmosphere; according to conservative estimates, the total flux in July was 2 × 1011 g of carbon in the form of CO2.

中文翻译：

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鄂毕河干流水与大气间溶解无机碳和CO2通量的动力学

对2016年7月鄂毕河中下游碳酸盐岩系统参数动态研究结果进行了分析。河流水域碳酸盐特征的分布遵循稳定的纬度趋势，由流域的景观地球化学条件和多年冻土分布决定。介绍了鄂毕河水-大气系统中 CO2 通量的大小和方向的第一个现场数据。结果表明，河流中下游水域的CO2相对于其大气含量呈多重过饱和状态，日均逃逸量达到625.9 mmol·m-2 day-1，平均值为102.1 mmol·m- 2 天–1。确定研究河段的鄂毕河水域是大气中重要的二氧化碳来源；据保守估计，7 月份的总通量为 2 × 1011 g 以 CO2 形式存在的碳。