秋季东海海域氢气的分布、光化学产生与释放通量研究  

Spatial distribution,photo-production and flux of Hydrogen in the East China Sea in autumn

作　　者：姜宇成 许高宾 周立敏[2] 张洪海[1,2] JIANG Yu-cheng;XUGao-bin;ZHOU Li-min;ZHANG Hong-hai(Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Frontiers Science Center for Deep Ocean Multispheres and Earth System,Ocean University of China,Qingdao 266100,China;College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学深海圈层与地球系统前沿交叉中心,海洋化学理论与工程技术教育部重点实验室,山东青岛266100 [2]中国海洋大学化学化工学院,山东青岛266100

出　　处：《中国环境科学》2023年第8期3900-3908,共9页China Environmental Science

基　　金：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)。

摘　　要：于2021年10月对东海海域氢气(H_(2))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H_(2)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,H_(2)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H_(2)的重要来源.表层海水中H_(2)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H_(2)的过饱和系数在7.14~24.37之间,显示海水中H_(2)处于过饱和状态.H_(2)的海-气通量范围为0.53~9.19μmol/(m·d),平均值为(3.50±1.86)μmol/(m^(2)·d),表明东海海域是大气中H_(2)的净源.The spatial distribution,photo-production rate and sea-to-air flux of hydrogen(H_(2))were investigated in the East China Sea in October,2021.The concentration of H_(2) 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 H_(2),the higher concentrations appeared at the bottom(11.86nmol/L)which attributed to the release from sediment,as an important source of H_(2) in the bottom seawater,according to the sediment incubation experiment.The photo-production rates 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 H_(2) photo-production rates and cumulative photon flux under UV and PAR was 33:1.In addition,the saturation factors of H_(2) ranged from 7.14 to 24.37,suggesting the concentrations of H_(2) were oversaturated in seawater.The sea-to-air fluxes of H_(2) were estimated to be from 0.53 to 9.19μmol/(m^(2)·d),with a mean of(3.50±1.86)μmol/(m^(2)·d),which indicated that the East China Sea is the net source of atmospheric H_(2).

关 键 词：氢气 分布 光化学产生 海-气通量 东海 

分 类 号：X511[环境科学与工程—环境工程]