中国海洋大学学报（自然科学版）2025，Vol.55Issue(11)：99-111,13.DOI:10.16441/j.cnki.hdxb.20240389
秋季珠江口-南海西部海域挥发性卤代烃的浓度分布与海-气通量
Concentration Distribution and Sea-air Fluxes of Volatile Halocarbons in the Pearl River Estuary-Western South China Sea in Autumn
摘要
Abstract
The concentration of trichlorofluoromethane(CFC-11),iodomethane(CH3I),dibro-momethane(CH2Br2),and monochlorodibromomethane(CHBr2Cl)in the seawater and atmosphere were measured simultaneously in the Pearl River Estuary-Western South China Sea during October,2023.The horizontal and vertical distributions of the four volatile halocarbons(VHCs)and their influ-ences were investigated,and the sea-air fluxes of the four VHCs were estimated.The results showed that the mean concentrations of CFC-11,CH3I,CH2Br2,and CHBr2Cl in surface seawater were(12.74±10.66),(12.18±12.43),(10.79±7.72),and(21.66±17.45)pmol·L-1,respectively.The distribution of VHCs in the surface seawater showed a trend of high concentrations in the near shore and low values appearing in the open waters,with the high value occurring in the coastal waters of the Pearl River Estuary and the eastern Hainan Island.A combination of water masses,anthropogenic sources,and algae releases contributed to elevated concentrations of the four VHCs concentrations in the surface seawater.The vertical distribution of CH3I and CHBr2Cl were characterized by the high values in the bottom layer due to the suspended release of bottom sediments or the release of benthic organ-isms.The mean values of atmospheric CFC-11,CH3I,CH2Br2,and CHBr2Cl concentration were(226.61±19.08),(1.19±0.75),(1.84±1.07),and(1.91±0.47)pptv,respectively.There was a large spatial variability in the distribution of the four VHCs concentrations in the atmosphere,influ-enced by meteorological parameters and the concentrations of VHCs in the surface seawater.The esti-mation results of the sea-air fluxes indicated that the area of the Pearl River Estuary and the Western South China Sea in autumn was a source of CH3I,CH2Br2,and CHBr2Cl and a sink of CFC-11 in the at-mosphere.关键词
挥发性卤代烃/珠江口/南海西部/分布/海-气通量Key words
volatile halocarbons/Pearl River Estuary/Western South China Sea/distribution/sea-air fluxes分类
海洋科学引用本文复制引用
韩旭,何真,张逸青,杨桂朋..秋季珠江口-南海西部海域挥发性卤代烃的浓度分布与海-气通量[J].中国海洋大学学报（自然科学版）,2025,55(11):99-111,13.基金项目
国家自然科学基金项目(42276039)资助Supported by the National Natural Science Foundation of China(42276039) （42276039）
