Seasonal variations in air-sea CO2 flux in the Bohai Sea and the temporal relationship between surface and bottom-water carbonate dynamics in a year

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research Pub Date : 2024-02-03 DOI:10.1016/j.csr.2024.105192

Hong-sheng Zhang , Wei-dong Zhai , Kai Tang

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引用次数: 0

Abstract

The Bohai Sea is the only China seas lacking data-based estimation of annual air-sea CO₂ flux. To fill this gap, we investigated regional differences in the seasonal variation of surface fugacity of CO₂ (ƒCO₂) and air-sea CO₂ fluxes in the Bohai Sea, based on mapping datasets collected from 15 carbonate-surveying cruises between 2011 and 2023. The results showed that air-sea CO₂ exchanges in the Bohai Sea are subject to both spatial and temporal variabilities. To sum up, the Bohai Sea acts as a very weak net CO₂ sinking area with a net uptake rate of 0.05 mol m⁻² yr⁻¹ in the surveyed area. The seasonal variation in ƒCO₂ can be attributed to spring/summer biological drawdown, summer/autumn vertical mixing, temperature variations, and air-sea re-equilibration. As a nutrient-rich ocean margin, the Bohai Sea experiences high primary production in its surface waters in spring, generating plenty of biogenic detritus and contributing to the oxygen shortage and acidification in the bottom waters in summer.

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渤海海气二氧化碳通量的季节变化及表层和底层碳酸盐动态的时间关系

渤海是中国唯一缺乏基于数据的年海气二氧化碳通量估算的海域。为填补这一空白，我们基于2011年至2023年期间15次碳酸盐勘测巡航所收集的测绘数据集，研究了渤海表层CO2逸度（ƒCO2）和海气CO2通量季节变化的区域差异。结果表明，渤海的海气二氧化碳交换存在时空变异。总之，渤海是一个非常弱的二氧化碳净吸收区，在调查区域的净吸收率为 0.05 mol m-2 yr-1。ƒCO2的季节变化可归因于春夏季生物缩减、夏秋季垂直混合、温度变化和海气再平衡。渤海作为营养丰富的大洋边缘，春季表层水初级生产力高，产生大量生物碎屑，导致夏季底层水缺氧和酸化。

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来源期刊

Continental Shelf Research 地学-海洋学

CiteScore

4.30

自引率

4.30%

发文量

136

审稿时长

6.1 months

期刊介绍： Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.