Within the framework of the STEMM-CCS project, a controlled CO₂ release experiment was conducted under real-life conditions in the Goldeneye complex area, a depleted gas field located in the UK sector of the North Sea. Here, the viability of water column monitoring for the detection of the injected CO₂ is evaluated. Real-time pH and pCO₂ measurements were taken in the water column during the CO₂ release experiment. Monitoring was carried out throughout the full water column, from the near-seafloor to the sea surface, in order to assess the spatial extent of the CO₂ release. The dispersion of the CO₂ plume was strongly influenced by tidal circulation in the area. The strongest signals were detected within 8 m of the bubble stream during low tide. The lowest pH and highest pCO₂ values were 7.965 and 942.1 µatm, respectively, corresponding to variations of 16.4% [H⁺] and 125.6% from baseline values. The pCO₂ baseline dynamics of Goldeneye area were assessed by the evaluation of the natural pCO₂-O₂ covariance. The estimation of seasonal thresholds for anomalous pCO₂ (pCO₂:O₂ ratio _May= 1.63 ± 0.04) allowed us to assess with confidence the non-biological origin of the detected CO₂ during the release experiment.

在 STEMM-CCS 项目的框架内，在位于英国北海地区的贫化气田 Goldeneye 复杂区域在真实条件下进行了受控 CO ₂释放实验。在此，评估了用于检测注入的 CO _{2 的}水柱监测的可行性。在CO ₂释放实验期间在水柱中进行实时pH 和pCO ₂测量。在整个水体中进行监测，从近海床到海面，以评估 CO ₂释放的空间范围。CO ₂的分散羽流受到该地区潮汐环流的强烈影响。在退潮期间，在气泡流 8 m 内检测到最强信号。最低 pH 值和最高 pCO ₂值分别为 7.965 和 942.1 µatm，对应于基线值的 16.4% [ H ⁺ ] 和 125.6% 的变化。Goldeneye 区域的pCO ₂基线动态通过自然pCO ₂ -O ₂协方差的评估来评估。对异常 pCO ₂季节性阈值的估计（pCO ₂ :O ₂比率_May = 1.63 ± 0.04）使我们能够自信地评估检测到的 CO 的非生物来源₂释放实验期间。