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Volume 34 Issue 4
Jul.  2015
Article Contents

Citation:

Distributions and sea-to-Air fluxes of volatile halocarbons in the Bohai Sea and northern Yellow Sea

  • Received Date: 2014-07-08
    Accepted Date: 2014-09-15
  • 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 CHBr2Cl,CHBr3,C2HCl3 and C2Cl4 in 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 showed that the lowest concentrations of the four VHCs occurred at 7:00 and 21:00,while the highest values appeared at 13:00 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/m2d,85.96 (-8.9~308.61) nmol/m2d,191.71 (0.10~386.67) nmol/m2d,285.14 (0.19~914.85) nmol/m2d,respectively,indicating that the investigated area appeared to be a source of atmospheric CHBr2Cl,CHBr3,C2HCl3 and C2Cl4 during the study time.
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  • [1] 杨桂朋,尹士序,陆小兰,等.吹扫-捕集气相色谱法测定海水中挥发性卤代烃[J].中国海洋大学学报:自然科学版,2007,37(2):299-304.[7]JEFFREY S W,MANTOURA R F C,WRIGHT S W.Phytoplankton pigments in oceanography:guidelines to modern methods[M].Paris:UNESCO,1997.[8]于 非,张志欣,刁新源,等.黄海冷水团演变过程及其与邻近水团关系的分析[J].海洋学报,2006,28(5):26-34.[9]沈志良,陆家平,刘兴俊,等.长江口区营养盐的分布特征及三峡工程对其影响[J].海洋科学集刊,1992,33:107-129.[13]杨桂朋,张 亮,陆小兰,等.黄海海水微表层和次表层中挥发性卤代烃的浓度和分布[J].中国海洋大学学报:自然科学版,2009,39(5):1077-1086.[16]江蓓洁,鲍献文,吴德星,等.北黄海冷水团温、盐多年变化特征及影响因素[J].海洋学报,2007,29(4):1-10.[20]白凤龙,高建华,汪亚平,等.鸭绿江口的潮汐特征[J].海洋通报,2008,27(3):7-13.[22]LISS P S,MERLIVAT L.Air-sea gas exchange rates:Introduction and synthesis[M]//BUAT-MNARD P.The role of air-sea exchange in geochemical cycling.Netherlands:Springer,1986:113-127.
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Distributions and sea-to-Air fluxes of volatile halocarbons in the Bohai Sea and northern Yellow Sea

  • 1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

Abstract: 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 CHBr2Cl,CHBr3,C2HCl3 and C2Cl4 in 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 showed that the lowest concentrations of the four VHCs occurred at 7:00 and 21:00,while the highest values appeared at 13:00 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/m2d,85.96 (-8.9~308.61) nmol/m2d,191.71 (0.10~386.67) nmol/m2d,285.14 (0.19~914.85) nmol/m2d,respectively,indicating that the investigated area appeared to be a source of atmospheric CHBr2Cl,CHBr3,C2HCl3 and C2Cl4 during the study time.

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