中文摘要：

使用吹扫-捕集气相色谱法于2013年11月对渤海和北黄海海水中4种常见的挥发性卤代烃（VHCs）浓度进行了分析。结果表明：秋季渤海和北黄海表层海水中CHBr2Cl、CHBr3、C2HCl3和C2Cl4的浓度平均值和变化范围分别为7.03（4.23～12.63）pmol/L、19.61（5.99～55.00）pmol/L、20.37（1.68～58.25）pmol/L和41.03（10.84～96.94）pmol/L。受生物生产、人为输入、陆地径流等因素的共同作用,4种VHCs浓度呈现出不同的空间分布特征,总体表现为渤海海域由北向南递减,北黄海海域山东半岛以北、鸭绿江口浓度较低的特点。受地理位置和水文条件的影响,不同站位VHCs浓度在垂直分布上有较大差异,但最大值均出现在真光层。周日变化研究表明：VHCs在13∶00和17∶00浓度较大,7∶00和21∶00浓度较低,说明VHCs生产释放受光照和潮汐等因素的共同影响。采用Liss和Salter双膜模型估算了CHBr2Cl、CHBr3、C2HCl3和C2Cl4的海-气通量,结果分别为36.28（0.13～109.54）nmol/m2·d、85.96（-8.9～308.61）nmol/m2·d、191.71（0.10～386.67）nmol/m2·d和285.14（0.19～914.85）nmol/m2·d,表明在调查期间渤海和北黄海是大气中CHBr2Cl、CHBr3、C2HCl3和C2Cl4的源。

英文摘要：

Volatile halocarbons（ VHCs） are important atmospheric trace gases,which play significant roles in the global warming and atmospheric chemistry. The concentrations of four VHCs in the Bohai Sea（ BS） and northern Yellow Sea（ NYS） were measured. The results showed that the concentrations of CHBr2 Cl,CHBr3,C2HCl3 and C2Cl4in the surface seawater of the BS and NYS were 7. 03（ 4. 23 ～ 12. 63） pmol / L,19. 61（ 5. 99 ～ 55. 00） pmol / L,20. 37（ 1. 68 ～ 58. 25） pmol / L,41. 03（ 10. 84 ～ 96. 94） pmol / L,respectively. The distributions of the four VHCs in the surface water of the BS and NYS were clearly influenced by the combined actions of biological production,anthropogenic activities and riverine input,and exhibited a gradually decreasing trend from north to south in the BS,with the minimum concentrations appearing on the north of Shandong Peninsula and in the Yalu River estuary. The depth profiles of the four VHCs were characterized by the maxima in the euphotic layer due to the impacts of geographical locations and hydrological conditions. The diel variation of VHCs was investigated at a fixed station. The results showedthat the lowest concentrations of the four VHCs occurred at 7 ∶ 00 and 21 ∶ 00,while the highest values appeared at13∶ 00 and 17∶ 00,indicating that a combination of illumination and tide might be responsible for the diurnal variation of VHCs. On the basis of gas exchange model and surface concentrations of VHCs,the mean sea-to-air fluxes of four VHCs in the study area were estimated to be 36. 28（ 0. 13 ～ 109. 54） nmol / m2·d,85. 96（-8. 9 ～308. 61） nmol/m2·d,191. 71（ 0. 10 ～386. 67） nmol/m2·d,285. 14（ 0. 19 ～ 914. 85） nmol/m2·d,respectively,indicating that the investigated area appeared to be a source of atmospheric CHBr2 Cl,CHBr3,C2HCl3 and C2Cl4during the study time.