As the most important sediment source to the north Yellow Sea(NYS),the sediment discharge from the Yellow River has substantially decreased for at least half a century.The response of the existing mud patches to this ...As the most important sediment source to the north Yellow Sea(NYS),the sediment discharge from the Yellow River has substantially decreased for at least half a century.The response of the existing mud patches to this decline is not well understood.Here,we present high-resolution grain-size parameters and geochemical composition of one gravity core(B23)collected in the NYS mud patch to investigate the behavior of the mud patch variation in correspondence to the Yellow River’s sediment discharge reduction.The B23 age model is derived by ^(210)Pb dating method,and the average sedimentation rate is estimated to be 0.49 cm/year.Results of a geochemical discrimination analysis suggest that the sediments of B23 were mainly transported from the Yellow River by the strong coastal current along the Shandong Peninsula,whereas the contributions of sediments from Yangtze and Yalu rivers are also measurable.In around 1980,the ratio of sediments from the Yellow River underwent an apparent decrease in the NYS mud.Simultaneous changes include coarsening of grain size and disaccord between East Asia Winter Monsoon intensity and content of sensitive grain size.These are all directly or indirectly due to the decline of the Yellow River’s sediment discharge.展开更多
基金supported by the National Science Foundation of China(NSFC,grant Nos.41530966,41476070,and U1606401).
文摘As the most important sediment source to the north Yellow Sea(NYS),the sediment discharge from the Yellow River has substantially decreased for at least half a century.The response of the existing mud patches to this decline is not well understood.Here,we present high-resolution grain-size parameters and geochemical composition of one gravity core(B23)collected in the NYS mud patch to investigate the behavior of the mud patch variation in correspondence to the Yellow River’s sediment discharge reduction.The B23 age model is derived by ^(210)Pb dating method,and the average sedimentation rate is estimated to be 0.49 cm/year.Results of a geochemical discrimination analysis suggest that the sediments of B23 were mainly transported from the Yellow River by the strong coastal current along the Shandong Peninsula,whereas the contributions of sediments from Yangtze and Yalu rivers are also measurable.In around 1980,the ratio of sediments from the Yellow River underwent an apparent decrease in the NYS mud.Simultaneous changes include coarsening of grain size and disaccord between East Asia Winter Monsoon intensity and content of sensitive grain size.These are all directly or indirectly due to the decline of the Yellow River’s sediment discharge.
