秋季东海挥发性卤代烃的分布和海-气通量研究

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Abstract

The concentrations of four kinds of VHCs including CH₃I, CH₃Br, CHBr₃ and C₂Cl₄ in the East China Sea were measured during the period of 19 October 2015 to 2 November 2015. Furthermore, C₂Cl₄ and three kinds of CFCs concentrations in the marine atmosphere were determined. The concentrations of CH₃I, CH₃Br, CHBr₃ and C₂Cl₄ in the coastal waters were higher than those in the open sea. In the PN section the vertical distribution of VHCs had a common feature that the maxima appeared in the upper mixed layer. The distributions of the four kinds of VHCs were significantly influenced by the Yangtze River runoff, the Kuroshio water, biological production and anthropogenic activities. A positive correlation was found between the CH₃I and chlorophyll-a (Chl-a) concentrations in the surface seawater, indicating that phytoplankton biomass might play an important role in the distribution of CH₃I. Besides, a marked positive correlation among the CH₃I, CH₃Br and CHBr₃concentrations were observed, suggesting that they might have some common sources and removal pathways. The atmospheric concentrations of the three kinds of CFCs were lower than the global averages, showed that the emissions of CFCs in China were progressively reduced. According to the analysis results of backward trajectories, the offshore terrigenous pollutant diffusion and transport were the main source of C₂Cl₄, CFC-11, CFC-113 and CFC-114 in the East China Sea atmosphere. The sea-to-air flux data indicated that the entire East China Sea shelf acted as a source for atmospheric CH₃I, CH₃Br, CHBr₃ and C₂Cl₄ during the study period.

Key words： volatile halocarbon distribution marine atmosphere sea-to-air flux East China Sea

Received: 30 September 2016

PACS:	X511
	X142

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	LI Guan-lin
	HE Zhen
	YANG Gui-peng
	YUAN Da

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LI Guan-lin,HE Zhen,YANG Gui-peng等. Distribution characteristics and sea-to-air fluxes of volatile halocarbons in the East China Sea in autumn[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(5): 1724-1734.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I5/1724

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