Synergistic CO_(2)Removal via Enhanced Olivine Weathering and Diatom Growth in the Ocean  

作　　者：Enquan Zhang Yunxuan Li Yiwen Wang Dong Liu Yu Cong Jihua Liu Kunxian Tang Nianzhi Jiao Qiang Zheng 

机构地区：[1]State Key Laboratory for Marine Environmental Science,Institute of Marine Microbes and Ecospheres,College of Ocean and Earth Sciences,Xiamen University,Xiamen 361102,China [2]Fujian Key Laboratory of Marine Carbon Sequestration,Xiamen University,Xiamen 361102,China [3]CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials,Guangzhou Institute of Geochemistry,Institutions of Earth Science,Chinese Academy of Sciences,Guangzhou 510640,China [4]Institute of Marine Science and Technology,Shandong University,Qingdao 266237,China [5]Third Institute of Oceanography,Ministry of Natural Resources,Xiamen 361005,China

出　　处：《Ocean-Land-Atmosphere Research》2024年第1期254-265,共12页海洋-陆地-大气研究(英文)

基　　金：supported by the National Natural Science Foundation of China(42188102,42222604,and 92351303);the Joint Funds of the National Natural Science Foun-dation of China(U1906216);the Chinese Academy of Sciences(project XK2022DXA001);the Marine Economic Develop-ment Program of Fujian Province(grant no.FJHJF-L-2022-11);the Fundamental Research Funds for the Central Universities(20720190095);funds from the Third Institute of Oceano-graphy,Ministry of Natural Resources(grant EPR2022001).

摘　　要：Enhancing the alkalinity of the ocean is a promising approach for CO_(2)removal by promoting marine carbon sequestration.Olivine is a key candidate material for enhancing alkalinity owing to its release of silicates when dissolved in seawater.These released compounds serve as crucial nutrients for phytoplankton such as diatoms to foster their growth,which in turn accelerates olivine dissolution and further enhances carbon sequestration.In this study,we investigated the short-term synergistic CO_(2)removal effects of an olivine-diatom coculture system.Over a 6-day incubation period,the olivine dissolution was 92%to 144%higher in the olivine-diatom groups compared with the olivine-only groups.The olivine-only groups achieved a CO_(2)removal efficiency of 5.15%to 5.49%,while the olivine-diatom groups achieved a CO_(2)removal efficiency of 8.84%to 14.44%.Adding olivine was found to increase the total alkalinity by 70 to 100μM and the diatom abundance by 26.4%to 58.4%.Diatom growth and the fixed carbon content were greatly enhanced,particularly during the later silicate-depleted stage when the Si:C ratio significantly exceeded that of groups without olivine.This mutually beneficial olivine-diatom coculture system offers a highly efficient CO_(2)removal strategy for addressing climate change.The results of this study contribute to our understanding of carbonate and biological carbon pump processes.

关 键 词：CARBONATE alkali SILICATE 

分 类 号：P58[天文地球—岩石学]