The potential environmental response to increasing ocean alkalinity for negative emissions
The potential environmental response to increasing ocean alkalinity for negative emissions
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DOI：
10.1007/s11027-018-9830-z
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发表时间：
2019-10-01
影响因子：
4
通讯作者：
Perkins, Rupert
中科院分区：
文献类型：
--
作者：
Gore, Sarah;Renforth, Phil;Perkins, Rupert
负排放技术，人工海洋碱化（AOA），旨在通过增加总碱度（TA）将大气二氧化碳（CO2）储存在海洋中。碳酸钙饱和状态（Omega CaCO3）和pH值也会增加，这意味着AOA可以减轻敏感地区和生态系统的海洋酸化。然而，AOA可以将pH值和Omega CaCO3提高到远高于现代水平，并且对环境和生物影响知之甚少。在处理红色钙化藻（Cordella spp.）对于TA升高的海水，碳酸盐产量比对照增加了60%。这对过去的碳循环有影响，但也限制了AOA的环境影响和效率。碳酸盐的产生会降低CO2的去除效率。然而，增加TA并没有显着影响Cordella spp。初级生产力、呼吸作用或生物生理学。这些结果表明，AOA可能不是本质上有害的Cordella spp。AOA有可能减轻海洋酸化的影响。然而，该实验在受控环境中测试了单一物种，以限制特定的未知因素，钙化率的变化，并且需要额外的工作来了解AOA对其他生物，整个生态系统和全球碳循环的影响。
The negative emissions technology, artificial ocean alkalinization (AOA), aims to store atmospheric carbon dioxide (CO2) in the ocean by increasing total alkalinity (TA). Calcium carbonate saturation state (Omega CaCO3) and pH would also increase meaning that AOA could alleviate sensitive regions and ecosystems from ocean acidification. However, AOA could raise pH and Omega CaCO3 well above modern-day levels, and very little is known about the environmental and biological impact of this. After treating a red calcifying algae (Corallina spp.) to elevated TA seawater, carbonate production increased by 60% over a control. This has implication for carbon cycling in the past, but also constrains the environmental impact and efficiency of AOA. Carbonate production could reduce the efficiency of CO2 removal. Increasing TA, however, did not significantly influence Corallina spp. primary productivity, respiration, or photophysiology. These results show that AOA may not be intrinsically detrimental for Corallina spp. and that AOA has the potential to lessen the impacts of ocean acidification. However, the experiment tested a single species within a controlled environment to constrain a specific unknown, the rate change of calcification, and additional work is required to understand the impact of AOA on other organisms, whole ecosystems, and the global carbon cycle.