摘要
运用吹扫-捕集气相色谱法于2016年6月对东海海水和大气中5种短寿命挥发性卤代烃的浓度含量、分布来源特征及海-气通量进行了研究.结果表明,表层海水中CH_3I、CH_2Br_2、CHBr Cl_2、CHBr_2Cl和CHBr_3浓度平均值及范围分别为8.93(0.39~23.49)pmol/L、15.02(4.77~32.75)pmol/L、0.97(0.30~2.16)pmol/L、9.35(6.8~18.46)pmol/L和12.24(2.60~50.04)pmol/L.受陆源输入、水团和生物活动释放的影响,表层海水中CH_3I、CH2Br_2和CHBrCl_2的浓度分布呈现近岸高远海低的趋势,CHBr_2Cl和CHBr_3浓度呈现点状分布.相关性分析发现CHBr_3和Chl-a存在显著相关性,推断浮游植物生物量可能影响CHBr_3的浓度分布.大气中CH_3I、CH_2Br_2、CHBr Cl_2、CHBr_2Cl和CHBr_3浓度平均值及范围分别为3.52×10^(-12)(1.72×10^(-12)~10.00×10^(-12))、3.82×10^(-12)(0.20×10^(-12)~34.95×10^(-12))、1.40×10^(-12)(0.46×10^(-12)~6.18×10^(-12))、1.55×10^(-12)(0.16×10^(-12)~4.66×10^(-12))和6.63×10^(-12)(2.20×10^(-12)~11.61×10^(-12)).受陆源气团输送、生物生产和气象条件的共同影响,春季大气中5种短寿命挥发性卤代烃浓度分布较为复杂.海-气通量的估算结果表明春季东海是大气中CH_3I、CH2Br_2、CHBr Cl_2、CHBr_2Cl和CHBr_3的源.
The concentrations, sources and sea-to-air fluxes of five short-lived volatile halocarbons of the East China Sea were studied by Purge and Trap-Chromatography during June 2016. The results showed that the mean （range） concentrations of CH3I, CH2Br2, CHBrCl2, CHBr2Cl and CHBr3 in the surface sea water were 8.93 （0.39 - 23.49） pmol/L, 15.02 （4.77 - 32.75） pmol/L, 0.97 （0.30 - 2.16） pmol/L, 9.35 （6.8 - 18.46） pmol/L and 12.24 （2.60 - 50.04） pmol/L, respectively. The distributions of CH3I, CH2Br2 and CHBrCl2 in the surface seawater displayed a decreasing trend from inshore to offshore, while the distributions of CHBr2Cl and CHBr3 exhibited strong patchiness. The distributions of these gases were significantly influenced by terrestrial input, the mixed water mass and biological activity in spring. Significant correlation was observed between CHBr3and Chl-a concentrations in the surface seawater, indicating that phytoplankton biomass might play a significant role in the distribution of CHBr3. The mean （range） atmospheric mixing ratios of CH3I, CH2Br2, CHBrCl2, CHBr2Cl and CHBr3 were 3.52×10-12 （1.72×10-12-10.00×10-12）, 3.82×10-12（0.20×10-12-34.95×10-12）, 1.40×10-12（0.46×10-12-6.18×10-12）, 1.55×10-12 （0.16×10-12-4.66×10-12） and 6.63×10-12 （2.20×10-12-11.61×10-12）, respectively. The distribution patterns of atmospheric five short-lived volatile halocarbons were complex and affected by long-range transportation of air mass and meteorological condition. The sea-to-air flux data indicated that the entire East China Sea acted as a source for atmospheric CH3I, CH2Br2, CHBrCl2, CHBr2Cl and CHBr3 during the study period.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2018年第1期14-25,共12页
China Environmental Science
基金
国家重点研发计划项目(2016YFA0601304,2016YFA0601301)
国家自然科学基金(41506088,41320104008)
中央高校基本科研业务费项目(201513026,201762030)
海洋国家实验室“鳌山人才”卓越科学家计划项目(2015ASTP-OS12)
关键词
挥发性卤代烃
浓度分布
大气
海-气通量
东海
volatile halocarbons
distribution
atmosphere
sea-to-air flux
East China Sea
