Temporal-spatial variation of surface suspended matter in Zhejiang-Fujian coastal area based on MODIS
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摘要:
基于2015年中分辨率成像光谱仪（MODIS）卫星影像资料，结合实测悬浮体浓度数据及海表温度、风场、海表流场等资料，对浙闽近海表层悬浮体时空分布及控制因素进行了探讨。结果表明，浙闽近海表层悬浮体分布存在显著的季节性变化特征。研究区2～50 m等深线海域存在温度锋面，在一定程度上抑制了表层悬浮体向外海的输运。夏季的河流输沙有利于研究区北部近岸高浓度悬浮体分布，南风、西南风对表层悬浮体扩散起抑制作用；冬季在强烈东北季风作用下，再悬浮作用强烈，同时为表层悬浮体向南扩散提供了动力。本研究对完善东海内陆架泥质区沉积物输送机制具有一定的辅助作用。
Abstract:Based on the Moderate Resolution Imaging Spectroradiometer (MODIS) Terra imagery of 2015, combined with the measured surface suspensions concentration (SSC) data and sea surface temperature (SST), wind field data, sea surface current field data and so on, the temporal-spatial variation of surface suspensions and controlling factors in the coastal waters of Zhejiang and Fujian are discussed. Results show that the distribution of surface suspensions in the study area showed obvious seasonal variability. A temperature front in the 20–50 m isobath of the study area was revealed, and it inhibits the transport of surface suspensions to the offshore. The runoff and sediment transport of river in summer is conducive to the distribution of high-SSC near the coast in the northern part of the study area. Southwest wind inhibits the spread of surface suspensions. In winter, strong winter monsoon can resuspend surface sediments and promote the southward transportation of surface suspensions. This study improved the understanding of the sediment transport mechanism in the inner shelf mud area of the East China Sea.
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