Journal of Marine Sciences ›› 2023, Vol. 41 ›› Issue (1): 14-25.DOI: 10.3969-j.issn.1001-909X.2023.01.002

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Carbon cycling in costal ocean and CO2 negative emissions

YU Lei1,2(), LI Sanzhong1,2, SUO Yanhui1,2,*(), WANG Xiujuan1,2   

  1. 1. Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, MOE and College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
    2. Function Laboratory for Assessment and Prospecting Techniques of Marine Mineral Resources, Laoshan Laboratory, Qingdao 266237, China
  • Received:2022-10-18 Revised:2023-01-28 Online:2023-03-15 Published:2023-04-28

Abstract:

Costal ocean receives a bunch of carbon materials and nutrients from terrestrial sources, relates a lot of carbon-involving interactions. Meanwhile, it is normal that sedimentary reservoir-cap systems with good trap conditions beneath coastal ocean, these entrapments have potentials to storage CO2. This review focuses on the coastal ocean as the research object, and introduces the carbon cycle processes in coastal ocean, their factors which could influence CO2 fluxes in the carbon cycle processes, and the potential carbon storage mechanisms of the coastal marine sedimentary basins. From the perspective of “carbon peaking and carbon neutrality”, the significance of coastal oceans for “Ocean Negative Carbon Emission (ONCE)”, its potential promotion paths, carbon storage potentials in sedimentary basins and the problems faced by coastal oceans are discussed. Overall, the costal ocean is one of the important blue carbon sink areas. In the coastal marine seawater system, improving the reaction efficiency of microbial carbon pump and carbonate carbon pump have positive significance for CO2 negative emissions; The suitable reservoir-cap systems for CO2 storage beneath coastal ocean can not only provide extra spaces, but also guarantee the safety for CO2 storage. In the future, the main research directions should be to inhibit the conversion process of carbon materials to CO2 in coastal oceans and ensure the safety of CO2 storage in sedimentary reservoirs, these could provide theoretical basis and technical guarantee for CO2 negative emissions.

Key words: carbon cycling, blue carbon sink, CO2 negative emission, coastal ocean

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