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《Marine Geology & Quaternary Geology》 2018-05
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Seasonal variations of suspended sediments in transport and flux in the coastal area of the northern Fujian Province

XUE Biying;WANG Houjie;ZHANG Yong;BI Shipu;NING Ze;HU Gang;College of Marine Geosciences,Ocean University of China,Key Laboratory of Submarine Geosciences and Prospecting Technique,Ministry of Education;Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology;Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology,Ministry of Natural Resources;Qingdao Institute of Marine Geology,China Geological Survey;  
Based on the simultaneous field observation along three transects off the coastal area of the northern Fujian Province in September and December of 2015,as well as the data of sea surface temperature acquired from MODIS,seasonal variations in suspended sediment concentration(SSC)and transport flux are examined.The results show that the nearshore SSC in winter is much higher than that in summer,and vertical mixing is obviously enhanced in winter due to the intensification of the winter-monsoon.The offshore SSC has low seasonal variability.Because of the strong wind and Min-Zhe coastal current in winter,the nearshore sediment transport flux is much higher than that offshore,and as the result,the sediment is transported southwestward in both summer and winter seasons.However,in the offshore area the sediment is transported northeastward in winter and southwestward in summer.At the stations around 50-m in depth there is no significant seasonal differences in both SSC and sediment flux observed.The distribution of thermal front derived from the sea surface temperature indicates that the interaction between Min-Zhe coastal current and Taiwan Warm Current will join and form a banded transition zone along the 50-m isobath.Facts show that the thermal front plays an important role in the tempo-spatial distri-bution pattern of SSC in the coastal area of the study area.It may constrain the cross-isobath transportation of suspended matter,as indicated by the higher SSC in the nearshore side of thermal front.
【Fund】: 国家自然科学基金项目“全新世以来长江远端三角洲的物质混合及其环境指示”(41676052);; 中国地质调查项目(DD20160137 DD20160139)
【CateGory Index】: P736.21;P731.2
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