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Geoscience ›› 2023, Vol. 37 ›› Issue (01): 138-152.DOI: 10.19657/j.geoscience.1000-8527.2022.034

• Geophysics and Information Technology • Previous Articles     Next Articles

Effect of Methane from Natural Gas Hydrate Decomposition on Marine Life

GUO Zihao1(), LI Canping1(), CHEN Fengying1, GOU Limin2, WANG Hongtao3, ZENG Xianjun4, LIU Yilin1, TIAN Xinyu1   

  1. 1. School of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang, Guangdong 524088, China
    2. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China
    3. The Interpretation and Evaluation Center of CNLC Tianjin Branch, Tianjin 300457, China
    4. Guangzhou Marine Geological Survey, Guangzhou, Guangdong 510075, China
  • Received:2022-04-12 Revised:2022-09-30 Online:2023-02-10 Published:2023-03-20

Abstract:

With changing seabed environment and the intensification of global warming, more natural gas hydrates have decomposed and released large amount of methane into the oceans. Some of the methane would ascend through the seawater and enter the atmosphere, which would increase the atmospheric greenhouse gas concentration, and thereby exacerbate global warming. From the perspective of methane release and migration pathways, the direct/indirect effects of methane on marine life are elucidated and summarized: (1) hydrates decompose to release methane, which is an indispensable compound in lifeform formation. This provides energy and material for autotrophic microorganisms, and supplies the food base of cold-spring biota. This maintains cold-spring biota based on a food chain of chemoautotrophic bacteria, which multiply in the cold-spring ecosystem; (2) some of the methane gas would diffuse and dissolve in the seawater, which causes seawater acidification. Seawater acidification would both affect the biosynthesis of calcium carbonate shells (calcification) and accelerate the shell dissolution; (3) as a strong greenhouse gas, the released methane in the atmosphere would exacerbate global warming. In addition, the melting of the polar permafrost would also release large amount of methane into the atmosphere, which generates an adverse cycle. The warming of seawater would affect the survival, metabolism, reproduction, development and immune response of marine life and other biological activities. Our findings provide important reference for future research on the impact of methane on marine ecosystem.

Key words: natural gas hydrate, methane, marine life, ocean acidification, ocean warming

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