夏季南海东北部海域生源硫化物的分布特征和释放通量及其对中尺度涡旋的响应  

Distribution and Sea to Air Flux of Biogenic Sulfur Compounds in the Northeastern South China Sea During Summer and Their Response to Mesoscale Eddies

作　　者：闫泽龙 徐锋 单体兴 吴谨巍 周立敏[2] 张洪海[1,2] Yan Zelong;Xu Feng;Shan Tixing;Wu Jinwei;Zhou Limin;Zhang Honghai(Frontiers Science Center for Deep Ocean Multispheres and Earth System/Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education of China,Ocean University of China,Qingdao 266100,China;College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China;Binhai Branch,Weifang Environmental Protection Bureau,Weifang 262737,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 [3]山东省潍坊市生态环境局滨海分局,山东潍坊262737

出　　处：《中国海洋大学学报(自然科学版)》2025年第2期67-77,共11页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(42276042,41876082);崂山实验室科技创新项目(LSKJ202201701)资助。

摘　　要：生源硫化物在海洋硫循环中扮演着重要的角色,并对全球气候变化产生重要的影响。本文于2020年7—8月对中国南海东北部进行现场调查,研究了海水中二甲基硫(Dimethylsulfide, DMS)、β-二甲巯基丙酸内盐(β-Dimethylsulfoniopropionate, DMSP)、二甲亚砜(Dimethylsulfoxide, DMSO)的时空分布,并探究了中尺度涡对其分布与产生的影响。结果表明,表层海水中DMS、溶解态DMSP(DMSPd)、颗粒态DMSP(DMSPp)、溶解态DMSO(DMSOd)和颗粒态DMSO(DMSOp)的平均浓度分别为(2.93±2.39)、(2.89±2.11)、(6.56±3.41)、(10.84±7.58)和(7.44±4.88) nmol·L^(-1)。气旋涡控制区域的生源硫化物浓度明显高于反气旋涡控制区,且中尺度涡边缘生源硫化物浓度高于涡内。生源硫化物均与叶绿素a(Chl a)存在较好的相关性,说明浮游植物生物量是影响南海有机硫化物生产分布的重要因素。气团在经过Chl a高值区后,会为南海东北部带来更高的DMS大气混合比。夏季南海DMS海-气通量在0.16~19.88μmol·m^(-2)·d^(-1)之间,平均值为(5.86±6.16)μmol·m^(-2)·d^(-1)。由于气旋涡控制区域具有较高的海水DMS浓度,其海-气通量((5.86±6.16)μmol·m^(-2)·d^(-1))高于反气旋涡控制区域((3.71±4.73)μmol·m^(-2)·d^(-1))与中尺度涡影响区域((4.61±4.77)μmol·m^(-2)·d^(-1)),表明中尺度涡在控制生源硫化物的生产释放过程中发挥重要的作用。Biogenic sulfur compounds play a crucial role in the marine sulfur cycle and have significant implications for global climate change.A field investigation was conducted in the northeastern South China Sea during July—August 2020,to investigate the spatial and temporal distributions of dimethylsulfide(DMS),β-dimethylsulfoniopropionate(DMSP),and dimethylsulfoxide(DMSO)in seawater.and study the influence of mesoscale eddies on their distribution and production.The results indicate that the average concentrations of DMS,dissolved DMSP(DMSPd),particulate DMSP(DMSPp),dissolved DMSO(DMSOd),and particulate DMSO(DMSOp)in surface seawater were(2.93±2.39),(2.89±2.11),(6.56±3.41),(10.84±7.58),and(7.44±4.88)nmol·L^(-1),respectively.The concentrations of biogenic sulfur compounds in cyclonic eddy-controlled region were significantly higher than those in anticyclonic eddy-controlled region,with higher concentrations observed at the edges of mesoscale eddies compared to their interiors.Biogenic sulfur compounds showed strong correlations with chlorophyll a(Chl a),indicating that phytoplankton biomass is a crucial factor influencing the distributions of organic sulfur compounds in the South China Sea.Air masses passing through regions with high Chl a values were found to bring higher atmospheric mixing ratios of DMS over the northeastern South China Sea.The sea-to-air flux of DMS ranged from 0.16 to 19.88μmol·m^(-2)·d^(-1),with an average of(5.86±6.16)μmol·m^(-2)·d^(-1),in the study area during summer.Due to the higher seawater DMS concentrations in cyclonic eddy-controlled region,the sea-to-air flux((5.86±6.16)μmol·m^(-2)·d^(-1))was higher than those in anticyclonic eddy-controlled region((3.71±4.73)μmol·m^(-2)·d^(-1))and the region without mesoscale eddy control((4.61±4.77)μmol·m^(-2)·d^(-1)),highlighting the significant role of mesoscale eddies in controlling the production and release of biogenic sulfur compounds.

关 键 词：生源硫化物 分布 海-气通量 中尺度涡 南海 

分 类 号：P734[天文地球—海洋化学]