摘要
挥发性硫化物(volatile sulfur compounds,VSCs)是大气中一类重要的痕量活性气体,对全球硫循环和气候变化有着重要的影响.于2018年6—7月运用冷阱捕集气相色谱和气-质联用法测定了东海海水与大气中3种重要的VSCs即羰基硫(carbonyl sulfide,COS)、二甲基硫(dimethyl sulfide,DMS)、二硫化碳(carbon disulfide,CS_(2))的浓度,分析了其与相关环境因子的相关性,并估算了它们的海-气通量.研究结果表明,夏季东海表层海水中COS、DMS和CS_(2)的浓度平均值分别为(0.47±0.33)、(4.46±4.52)和(0.13±0.07)nmol·L^(-1),海水中COS和CS_(2)的高值区出现在长江口附近海域,DMS在东海南部海域的浓度远低于北部海域.大气中COS、DMS和CS_(2)的浓度平均值分别为(564.0±37.5)×10^(-12)、(70.7±83.5)×10^(-12)和(177.6±232.3)×10^(-12)(以体积分数计),COS分布均匀,CS_(2)的分布呈现近岸高远海低的特点,而DMS的分布受海-气扩散的影响.相关性分析表明,夏季东海海水中COS和CS_(2)与海水中的营养盐存在正相关关系,这可能是因为营养盐能促进浮游植物生长,而浮游植物生长过程中能释放COS和CS_(2)的前体进入水体,从而促进COS和CS_(2)的生产.此外,夏季东海中COS、DMS和CS_(2)的海-气通量平均值为(1.05±1.13)、(9.21±9.49)和(0.24±0.22)μmol·m^(-2)·d^(-1),表明夏季东海是大气中3种VSCs的源.
Volatile sulfur compounds(VSCs)are important trace active gases in the atmosphere and play an important role on the global sulfur cycle and climate change.The concentrations of three important VSCs named carbonyl sulfide(COS),dimethyl sulfide(DMS),and carbon disulfide(CS_(2))in the seawater and atmosphere of the East China Sea in June—July 2018 were measured by Purge and Trap-Gas Chromatography to study their influencing factors and sea-to-air fluxes.The average concentrations of COS,DMS and CS_(2) in the surface seawater were(0.47±0.33),(4.46±4.52)and(0.13±0.07)nmol·L^(-1),respectively.The high values of COS and CS_(2) in the seawater appeared near the Yangtze River estuary,while the concentrations of DMS in the southern area of the East China Sea were much lower than those in the northern area.The average concentrations of COS,DMS and CS_(2) in the atmosphere over the East China Sea were(564.0±37.5)×10^(-12),(70.7±83.5)×10^(-12) and(177.6±232.3)×10^(-12)(in volume fraction),respectively.The distribution of COS was relatively uniform in the study area,while the distribution of CS_(2) exhibited an obvious characteristic with the high values in the coastal atmosphere and the low values over the open sea.The distribution of DMS was affected by the sea-to-air diffusion.The correlation analysis showed that the COS and CS_(2) concentrations in the study area were correlated with seawater nutrient concentrations.This might be because nutrients could promote the growth of phytoplankton,and the precursors of COS and CS_(2) were released into the seawater during the growth of phytoplankton,which promoted the productions of COS and CS_(2).In addition,the average sea-to-air fluxes of COS,DMS and CS_(2) were(1.05±1.13),(9.21±9.49)and(0.24±0.22)μmol·m^(-2)·d^(-1),indicating that the East China Sea was the source of three VSCs.
作者
孙小菡
张洪海
于蕾
杨剑
杨桂朋
SUN Xiaohan;ZHANG Honghai;YU Lei;YANG Jian;YANG Guipeng(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100;Laboratory for Marine Ecology and Environmental Science,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237;Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Coastal Zone Environmental Engineering Technology Research Center,Yantai 264003)
出处
《环境科学学报》
CAS
CSCD
北大核心
2021年第10期4256-4267,共12页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.41976038,41830534)
国家重点研发计划项目(No.2016YFA0601300)
中央高校基本科研业务费项目(No.201762030)。
关键词
挥发性硫化物
分布
海-气通量
东海
volatile sulfur compounds
distribution
sea-to-air flux
East China Sea
