Research on Air-sea Flux and Influencing Factors of Methane in a Typical Mariculture Along the Southeastern Coast of China: the Sansha Bay
Received date: 2024-09-09
Revised date: 2024-10-20
Online published: 2025-01-17
Supported by
the Special Fund for Promoting High-Quality Development of Marine and Fisheries Industries in Fujian Province(FJHJF-TH-2023-3);Guidance Project of Fujian Provincial Science and Technology Program(2023N01010293)
Evaluating the distribution and sea-air fluxes of dissolved methane (CH4) in mariculture areas is important for understanding how aquaculture contributes to regional CH4 emissions into the atmosphere. Seasonal field surveys conducted in 2023 were used to analyze the temporal and spatial variation of CH4 concentrations in surface water and CH4 air-sea flux in a typical aquaculture system in Sansha Bay, Fujian Province. The results showed that dissolved CH4 concentrations ranged from 9.91 to 609.22 nmol/L, with corresponding air-sea fluxes between 3.46 to 1 188.15 μmol/ (m2·d). Temporally, the CH4 air-sea fluxes were higher in summer and autumn compared to spring and winter. Spatially, CH4 concentrations and air-sea fluxes decreased consistently from the estuary to the bay mouth, with the highest values in the estuarine aquaculture area and the lowest in the bay mouth aquaculture area. Correlation analysis showed that aquacultural activities and terrestrial runoff inputs contributed to the spatiotemporal distribution of CH4 concentrations within the bay. In the macroalgae cultivation zones, CH4 production and emissions during farming periods were significantly lower than during non-farming periods. Additionally, the residual feed and feces generated by fish in cages may result in increased CH4 emissions. Notably, CH4 emissions peaked in summer, due to enhanced aquaculture activities and runoff inputs during the wet season. Future work should focus on investigating CH4 air-sea fluxes in mariculture areas to provide scientific support for CH4 control and emission reduction in aquaculture.
Lingyi LEI , Feipeng WANG , Kunpeng ZANG , Xiaolong Lü , Zhi ZHANG , Liyang YANG , Jingli MU . Research on Air-sea Flux and Influencing Factors of Methane in a Typical Mariculture Along the Southeastern Coast of China: the Sansha Bay[J]. Advances in Earth Science, 2024 , 39(11) : 1156 -1168 . DOI: 10.11867/j.issn.1001-8166.2024.088
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