Optical assessment of impact and recovery of sedimentary pH profiles in ocean acidification and carbon capture and storage research
Optical assessment of impact and recovery of sedimentary pH profiles in ocean acidification and carbon capture and storage research
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DOI：
10.1016/j.ijggc.2014.10.018
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发表时间：
2015-07
影响因子：
3.9
通讯作者：
A. Queirós;P. Taylor;Adam R. Cowles;Andy Reynolds;S. Widdicombe;H. Stahl
中科院分区：
文献类型：
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作者：
A. Queirós;P. Taylor;Adam R. Cowles;Andy Reynolds;S. Widdicombe;H. Stahl
测量海洋酸化（OA）和碳捕获和储存（CCS）泄漏对海洋沉积物pH值剖面的影响的现有方法不适合重复的实验设置。为了克服这个问题，提出了一种新的光学传感器应用，使用现成的光电二极管技术（MOPP）。应用程序进行验证，使用微剖面，在CCS泄漏实验，在两种类型的天然海洋沉积物中的影响和恢复从高CO2羽流进行了调查。MOPP提供了用户友好性、数据采集速度、对沉积物类型的鲁棒性和大的沉积物深度范围。这种特性的集合克服了OA和CCS研究中其他pH测量方法所面临的许多挑战。沉积物类型之间的影响差异很大，取决于基线pH值的变化和沉积物的渗透性。沉积物的pH值曲线恢复很快，与配置文件接近控制条件后24小时停止泄漏。然而，在恢复阶段的第4天，较细沉积物内的pH值变化仍然明显。因此，需要考虑生境特征，以真正理清高CO2扰动对底栖系统的影响。对自然群落的影响不仅取决于扰动造成的pH梯度，而且还取决于在扰动之后仍然存在的其他过程，这增加了恢复的复杂性。
Available methods for measuring the impact of ocean acidification (OA) and leakage from carbon capture and storage (CCS) on marine sedimentary pH profiles are unsuitable for replicated experimental setups. To overcome this issue, a novel optical sensor application is presented, using off-the-shelf optode technology (MOPP). The application is validated using microprofiling, during a CCS leakage experiment, where the impact and recovery from a high CO2plume was investigated in two types of natural marine sediment. MOPP offered user-friendliness, speed of data acquisition, robustness to sediment type, and large sediment depth range. This ensemble of characteristics overcomes many of the challenges found with other pH measuring methods, in OA and CCS research. The impact varied greatly between sediment types, depending on baseline pH variability and sediment permeability. Sedimentary pH profile recovery was quick, with profiles close to control conditions 24 h after the cessation of the leak. However, variability of pH within the finer sediment was still apparent 4 days into the recovery phase. Habitat characteristics need therefore to be considered, to truly disentangle high CO2perturbation impacts on benthic systems. Impacts on natural communities depend not only on the pH gradient caused by perturbation, but also on other processes that outlive the perturbation, adding complexity to recovery.