秋季东海海域氢气的分布、光化学产生与释放通量研究

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摘要于2021年10月对东海海域氢气(H₂)的浓度分布,光化学产生速率与海-气通量进行了现场调查研究.秋季东海表层海水中H₂的浓度范围为2.94~7.67nmol/L,平均值为(4.82±1.12)nmol/L.垂直分布上,H₂浓度高值出现在底层(11.86nmol/L),结合沉积物培养实验表明沉积物释放是底层海水H₂的重要来源.表层海水中H₂的光化学产生速率范围为0.42~1.14nmol/(L×h),平均值为(0.72±0.25)nmol/L,其中紫外光和可见光的单位光量子产生速率之比为33:1.此外,表层海水中H₂的过饱和系数在7.14~24.37之间,显示海水中H₂处于过饱和状态.H₂的海-气通量范围为0.53~9.19μmol/(m×d),平均值为(3.50±1.86)μmol/(m²×d),表明东海海域是大气中H₂的净源.

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	姜宇成
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关键词 ：氢气, 分布, 光化学产生, 海-气通量, 东海

Abstract：The spatial distribution, photo-production rate and sea-to-air flux of hydrogen (H₂) were investigated in the East China Sea in October, 2021. The concentration of H₂ in the surface seawater ranged from 2.94 to 7.67nmol/L, with a mean of value (4.82 ±1.12) nmol/L. As the vertical distribution of H₂, the higher concentrations appeared at the bottom (11.86nmol/L) which attributed to the release from sediment, as an important source of H₂ in the bottom seawater, according to the sediment incubation experiment. The photo-productionrates varied between 0.42 and 1.14nmol/(L·h), with an average of (0.72 ±0.25) nmol/L. The ratio of the quotient of H₂ photo-production rates and cumulative photon flux under UV and PAR was 33:1. In addition, the saturation factors of H₂ ranged from 7.14 to 24.37, suggesting the concentrations of H₂ were oversaturated in seawater. The sea-to-air fluxes of H₂ were estimated to be from 0.53 to 9.19 μmol/(m²·d), with a meanof (3.50 ±1.86) μmol/(m²·d), which indicated that the East China Sea is the net source of atmospheric H₂.

Key words： Hydrogen distribution photo-production sea-to-air flux East China Sea

收稿日期: 2023-01-13

PACS:

X511

基金资助:国家自然科学基金资助项目(41876082,42276042)；自然资源部海洋大气化学与全球变化重点实验室开放基金资助课题(GCMAC2007)

通讯作者: 张洪海,教授,honghaizhang@ouc.edu.cn E-mail: honghaizhang@ouc.edu.cn

作者简介: 姜宇成(1998-),男,内蒙古兴安盟人,中国海洋大学化学化工学院硕士研究生,主要从事海洋痕量活性气体的研究.oucerjyc@163.com

引用本文:

姜宇成, 许高宾, 周立敏, 张洪海. 秋季东海海域氢气的分布、光化学产生与释放通量研究[J]. 中国环境科学, 2023, 43(8): 3900-3908. JIANG Yu-cheng, XU Gao-bin, ZHOU Li-min, ZHANG Hong-hai. Spatial distribution, photo-production and flux of Hydrogen in the East China Sea in autumn. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 3900-3908.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I8/3900

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