叶旺旺^1,2, 谷雪霁^1,2, 康绪明^1,3, 刘素美^1,2, 张桂玲^1,2
1.中国海洋大学化学化工学院, 青岛 266100;2.海洋化学理论与工程技术教育部重点实验室, 青岛 266100;3.中国水产科学研究院 黄海水产研究所, 青岛 266071

摘要:
沉积物释放是海洋环境中甲烷（CH₄）的重要来源。通过2013年7月和8月两个航次，对东、黄海泥质区沉积物中CH₄浓度的垂直分布和沉积物-水界面通量进行了研究。结果表明，除个别站位外，黄海沉积物（50 cm以浅）中CH₄的浓度变化范围在0.2~1.0 μmol/L之间，长江口及浙闽沿岸附近的沉积物中CH₄浓度则要更高（1.0~2.0μmol/L），而东海东部海域沉积物中CH₄浓度波动范围为0.2~3.0 μmol/L。总体来说，东、黄海沉积物中CH₄浓度偏低，这可能与观测到的高浓度硫酸盐（>20 mmol/L）有关。通过整柱密室培养实验估算出东、黄海沉积物-水界面CH₄释放速率在0.64~2.12 μmol/（m²·d）之间，东、黄海沉积物CH₄释放总量为6.7×10⁸ mol/yr；但采用菲克定律估算的CH₄扩散通量则要比现场培养的结果低2~5倍，表明不同的方法在估算沉积物-水界面CH₄通量上还具有一定的不确定性。
关键词:东海沉积物甲烷硫酸盐沉积物-水界面通量
DOI：10.11759/hykx20190326003
分类号:
基金项目:科技部重点研发计划（2016YFA0601302）；国家自然科学基金（41521064）；泰山****工程专项和“鳌山人才”计划（2015ASTP-OS08）

Distribution and fluxes of methane in the sediments in the East China Sea and the Yellow sea in summer
YE Wang-wang^1,2, GU Xue-ji^1,2, KANG Xu-ming^1,3, LIU Su-mei^1,2, ZHANG Gui-ling^1,2
1.College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;2.Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education, Ocean University of China, Qingdao 266100, China;3.Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China
Abstract:
Sedimentary release is an important source of marine and atmospheric CH₄. of CH₄ concentrations in the sediment cores in the East China Sea and the Yellow Sea were determined to investigate its vertical profiles and sediment-water CH₄ fluxes. CH₄ concentrations in the Yellow Sea sediments ranged from 0.2 μmol/L to 1.0 μmol/L (depth<50 cm) except for station L06 under 40 cm (22.0 μmol/L). CH₄ concentrations in the sediments in the Changjiang River Estuary and the adjacent areas ranged from 1.0 μmol/L to 2.0 μmol/L. In the eastern area of the East China Sea, CH₄ concentrations in the sediments varied greatly, ranging from 0.2 μmol/L to 3.0 μmol/L. In general, low CH₄ concentrations observed in the study areas may relate to the high concentration of sulfate (>20 mmol/L). We estimated the sediment -water CH₄ fluxes as 0.64~2.12 μmol/(m²·d) by conducting the intact core incubation experiments. Our results combined with the previous studies indicated that the sediment-to-water CH₄ emission in the East China Sea and the Yellow Sea was estimated as 6.7×10⁸ mol/a. However, the emission rates estimated by Fick's law were 2~5 times lower than that calculated by the incubation experiments, suggesting the uncertainties when estimating the sediment-water CH₄ fluxes due to different models.
Key words:East China Seasedimentmethanesulfatesediment-water flux





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