秋季东海海水与大气中挥发性硫化物的分布、通量和环境控制因素研究  

Distribution,flux and environmental control factors of volatile sulfur compounds in the seawater and atmosphere of the East China Sea during autumn

作　　者：李磊 徐锋 孙茂祥 杨桂朋[1,2,3] LI Lei;XU Feng;SUN Maoxiang;YANG Guipeng(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100;Laboratory for Marine Ecology and Environmental Science,National Laboratory for Marine Science and Technology,Qingdao 266237;Institute of Marine Chemistry,Ocean University of China,Qingdao 266100)

机构地区：[1]中国海洋大学化学化工学院,青岛266100 [2]青岛海洋科学与技术国家实验室,海洋生态与环境科学功能实验室,青岛266237 [3]中国海洋大学海洋化学研究所,青岛266100

出　　处：《环境科学学报》2023年第7期252-263,共12页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.41976038);国家重点研发计划(No.2016YFA0601300)。

摘　　要：挥发性硫化物如二甲基硫(DMS)、羰基硫(COS)和二硫化碳(CS2)是全球硫循环的重要参与者,在全球环境和气候变化中发挥着重要作用.于2021年10月测定了东海海水和大气中DMS、COS和CS2的浓度,估算了它们的海-气通量,并探究了叶绿素a(Chl-a)等环境因子对3种硫化物的影响.结果表明,秋季东海DMS、COS和CS2在表层海水中的平均浓度分别为(3.24±3.04)、(0.14±0.04)和(0.03±0.02)nmol·L^(-1).其中,DMS表现出北端高、南端低和近岸高、远海低的分布趋势.相关性分析显示,海水中的DMS与Chl-a呈显著正相关,这说明海水中DMS的产生与浮游植物生物量密切相关.表层海水中COS和CS2表现出北端低、南端高和近岸低、远海高的分布趋势,这是由于近岸海水浊度高于远海,不利于COS和CS2的光化学产生.秋季东海DMS、COS和CS2在大气中的平均浓度分别为(147.2±106.2)×10^(-12)、(549.2±118.0)×10^(-12)和(80.8±97.2)×10^(-12)(以体积分数计).大气中的COS与DMS和CS2都表现出正相关关系,这可能是因为大气中的DMS和CS2能被·OH氧化为COS,两者是大气COS的重要潜在源.秋季东海DMS、COS和CS2海-气通量的平均值分别为(14.47±11.92)、(0.86±0.43)和(0.81±0.75)μmol·m-2·d-1,秋季东海是大气中DMS、COS和CS2的源.Volatile sulfur compounds such as dimethyl sulfide(DMS),carbonyl sulfide(COS),and carbon disulfide(CS2)are significant participants in the global sulfur cycle and play an important role in global environmental and climate change.The concentrations of DMS,COS and CS2 in the seawater and atmosphere of the East China Sea were measured during October 2021,their sea-to-air fluxes were estimated,and the influences of environmental factors such as chlorophyll a(Chl-a)on the three sulfur compounds were studied.The results showed that the average concentrations of DMS,COS and CS2 in the surface seawater were(3.24±3.04),(0.14±0.04)and(0.03±0.02)nmol·L^(-1),respectively.The distribution trend of DMS was high in the north,low in the south,high near shore and low in the open sea.Correlation analysis showed that there was a significant positive correlation between DMS and Chl-a,indicating that the production of DMS in seawater was closely related to phytoplankton activities.The distribution trend of COS and CS2 in surface seawater is low in the north,high in the south,low near shore and high in the open sea.This is because the turbidity of coastal seawater is higher than that of open sea,which is not conducive to the photochemical generation of COS and CS2.The average concentrations of DMS,COS and CS2 in the atmosphere over the East China Sea were(147.2±106.2)×10^(-12),(549.2±118.0)×10^(-12) and(80.8±97.2)×10^(-12),respectively.COS in the atmosphere shows a positive correlation with DMS and CS2,both of which can be oxidized to COS by·OH,and thus are potential important sources of atmospheric COS.The average sea-to-air fluxes of DMS,COS and CS2 were estimated to be(14.47±11.92),(0.86±0.43)and(0.81±0.75)μmol·m-2·d-1,respectively,suggesting that the East China Sea acted as an important source for atmospheric VSCs.

关 键 词：挥发性硫化物 浓度分布 海-气通量 东海 秋季 

分 类 号：X831[环境科学与工程—环境工程]