Sea-air fluxes and atmospheric chemical reactivity of C2~C5 non-methane hydrocarbon in the Yellow Sea and the Bohai Sea during autumn
ZHAO Qi-ran1, LI Jian-long1, WU Ying-cui1, ZHANG Hong-hai1,2, YAO Qing-zhen1,2, YANG Gui-peng1,2,3
1. College of Chemistry and Chemical Engineering, Ocean University of China. Qingdao 266100, China;
2. Laboratory for Marine Ecology and Chemistry and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;
3. Institute of Marine Chemistry, Ocean University of China, Qingdao, 266100, China
Seawater and atmospheric concentrations of C2~C5 non-methane hydrocarbons (NMHCs) were determined in the Yellow Sea and Bohai Sea during November 2014 with the preconcentration methods of purge-and-trap system and three-stage low-temperature preconcentration system combined with gas chromatography with mass spectrum detector. The sea-air fluxes of NMHCs and their atmospheric chemical reactivity were also studied. The average concentrations of ethane, propane, isobutane, n-butane, ethylene, propylene, 1-butene, isobutylene and isoprene in the surface water were 53.0, 49.4, 26.4, 29.2, 186, 62.7, 35.6, 89.9 and 42.4pmol/L, respectively, and the average volume percentages in the atmosphere were 0.043, 21, 0.36, 6.7, 7.5, 0.71, 0.12, 0.16 and 0.085×10-9. Atmospheric concentrations of ethane, propane, isobutane, n-butane, ethylene, propylene, 1-butene and isobutylene exhibited strong correlations within each other in the atmosphere, and none of them correlated to isoprene. The study shows that the coast shelf seas of China might be an important sources of C2~C5 NMHCs. Through the calculation of the ozone generation potential and OH· potential consumption rate of NMHCs, ethylene, propylene, propane and n-butane were found to be the key active components of C2~C5 NMHCs in the atmosphere over the Yellow Sea and the Bohai Sea.
赵其然, 李建龙, 吴英璀, 张洪海, 姚庆祯, 杨桂朋. 秋季黄渤海C2~C5非甲烷烃海-气通量与大气反应活性[J]. 中国环境科学, 2019, 39(5): 1838-1846.
ZHAO Qi-ran, LI Jian-long, WU Ying-cui, ZHANG Hong-hai, YAO Qing-zhen, YANG Gui-peng. Sea-air fluxes and atmospheric chemical reactivity of C2~C5 non-methane hydrocarbon in the Yellow Sea and the Bohai Sea during autumn. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 1838-1846.
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