黄海海水微表层和次表层中挥发性卤代烃的浓度和分布  

Concentrations and Distributions of Volatile Halocarbons in the Surface Microlayer and Subsurface Water of the Yellow Sea

作　　者：杨桂朋[1] 张亮[1] 陆小兰[1] 尹士序[1] 

机构地区：[1]中国海洋大学海洋化学理论与工程技术教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2009年第5期1077-1086,共10页Periodical of Ocean University of China

基　　金：国家杰出青年科学基金(40525017);国家自然科学基金(40776039);国家自然科学青年基金(40606023);山东省自然科学基金重点项目(Z2005E01);山东省"泰山学者"建设工程专项经费(JS200510016)资助

摘　　要：挥发性卤代烃(VHCs)是大气中的痕量气体,对臭氧层损耗和温室效应有重要作用。海洋是大气中VHCs的重要自然排放源,开展海洋VHCs的研究有助于了解海洋对大气VHCs和全球变暖的贡献。于2006年4月对中国黄海微表层、次表层中6种挥发性卤代烃的浓度和分布进行了研究。结果表明:微表层中CHCl3,CCl4,C2HCl3,C2Cl4,CHBrCl2和CHBr2Cl的浓度分别为2.91～45.88(10.31±8.07),0.20～2.74(0.80±0.64),1.13～32.07(11.43±6.53),0.16～73.68(17.10±15.57),0.08～1.64(0.43±0.34)和0.22～14.20(4.35±3.53)pmol.dm-3;次表层中各浓度分别为2.02～38.55(10.38±7.80),0.12～2.14(0.80±0.54),1.50～26.80(11.90±6.74),0.96～73.45(16.58±14.97),0.06～1.88(0.42±0.34)和0.27～25.24(4.95±4.92)pmol.dm-3;总的来说,在微表层、次表层中CCl4,CHCl3,C2HCl3和C2Cl4浓度的水平分布由于受到陆源输入的影响,从近岸往远海呈现逐渐降低的趋势。具有生物来源的CHBrCl2和CHBr2Cl在微表层和次表层中的浓度与叶绿素a(Chl-a)的分布相似,从近岸往远海呈现增高趋势。从微表层的结果来看,6种VHCs并未得到明显的富集,可能与微表层水与本体水的垂直混合有关。相关性研究结果表明,6种VHCs在微表层和次表层的浓度与盐度、温度、风速、Chl-a等参数并没有明显的相关性。本文估算出CCl4的海-气通量为-83.50×10-5g.m-2.a-1。Distributions of 6 volatile halocarbons（VHCs） in the Yellow Sea were determined in April 2006. The mean concentrations of CHCl3, CCl4, C2HCl3, C2Cl4, CHBrCl2 and CHBr2Cl in the microlayer and subsurface seawater were 2.91-45.88（10.31±8.07）, 0.20-2.74（0.80±0.64）, 1.13 -32. 07 （11. 43 ± 6.53）, 0.16-73.68（17.10 ± 15.57）, 0.08- 1.64（0.43 ± 0.34）, 0.22- 14.20（4.35 ± 3.53） pmol· dm^-3 and 2.02-38.55（10.38±7.80）, 0.12-2.14（0.80±0.54）, 1.50-26.80（11.90±6.74）, 0.96-73.45 （16.58 ± 14.97）, 0.06- 1.88（0.42 ± 0.34）, 0.27 -25.24（4.95 ± 4.92） pmol· dm^-3, respectively. The concentrations of CHCl3, CCl4, C2HCl3 and C2Cl4 showed a gradually decreasing trend from coastal zone to open sea, probably due to the influence of terrestrial substance input. The concentrations of CHBrCl2 and CHBr2Cl which were of biogenic origin showed a gradually increasing trend from coastal zone to open sea and their ctistribution patterns were similar to that of Chl-a. VHCs were not enriched in the microlayer, probably due to the enhanced vertical mixing between the microlayer and subsurface water during the investigation. Moreover, no significant relationships were found between VHCs and environmental factors such as salinity, temperature, wind speed and Chl-a. The evaluated sea-to-air fluxes of CCl4 in the study area was - 83.50 10^-5 g.m^-2.a^-1.

关 键 词：挥发性卤代烃 分布 黄海 微表层 次表层 

分 类 号：O657.63[理学—分析化学]