【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0.2～1.0μmol/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0.2～3.0μmol/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0.64～2.12μmol/（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。更多还原

【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.更多还原