海洋锋作用下环山东半岛海域悬沙浓度多时间尺度变化

Multi-time Scale Variation of Suspended Sediment Concentration over the Eastern Shandong Peninsula under Ocean Front

山东半岛附近海域是渤海高浓度泥沙向黄海输运的重要通道,且发育大型楔状泥质沉积体,研究水体中悬浮泥沙的输运特征和影响因素,对渤黄海物质交换、泥质沉积区发育机制研究具有重要意义。基于2011—2020年的MURSST海表温度数据和GOCI卫星影像反演的表层悬沙浓度数据,获得山东半岛附近海域海表温度及其温度锋面、海表悬沙浓度的时空变化特征,并初步分析了温度锋面、风等因素对悬沙输运的影响。研究结果显示:山东半岛附近海域温度锋面和悬沙浓度总体表现为“冬强夏弱”的季节变化特征,且温度锋面与悬沙浓度高值区边界分布一致;从年际变化来看,2012—2020年逐年1月温度锋面的东西向摆动和近岸高浓度悬沙向海扩散距离都与冬季风的强弱相关,总体呈现水体温度上升、悬沙浓度降低的趋势。

The sea area around the Shandong Peninsula is an important channel for the transport of a high concentration of sediment from the Bohai Sea to the Yellow Sea,and large wedge-shaped argillaceous sedimentary bodies are deposited there.The transport characteristics and influencing factors of suspended sediment in the water body are highly significant for the study of material exchange and the development mechanism of argillaceous sedimentary areas in the Bohai Sea and Yellow Sea.The temporal and spatial variation of sea surface temperature(SST),thermal front and suspended sediment concentration in the waters off the Shandong Peninsula were obtained from multiscale ultra-high resolution SST(MUR SST) data from 2011 to 2020 and from images of surface suspended sediment concentration accessed from the geostationary ocean color imager(GOCI) satellite.The effects of thermal front and wind on suspended sediment transport were analyzed.The locations of the thermal front and suspended sediment in the sea near the Shandong Peninsula show a seasonal variation that may be described as “strong in winter,weak in summer”,and the position of the thermal front is consistent with high concentrations of suspended sediment.From the perspective of interannual variation,the east-west oscillation of the thermal front and the distance of suspended sediment diffusion from the coast were related to the strength of the winter wind in January of each year from 2012 to 2020.The overall trend is for lower concentrations of suspended sediment with higher water temperature.