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引用本文:薛文静,乔璐璐,仲毅,薛程,陈树果,李舒豪,刘鹏,高飞.不同时间尺度下长江口海域表层悬浮体浓度变化.海洋与湖沼,2019,50(5):1002-1013.
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不同时间尺度下长江口海域表层悬浮体浓度变化
薛文静1,2, 乔璐璐1,2, 仲毅1,2, 薛程3, 陈树果3, 李舒豪1,2, 刘鹏1,2, 高飞4
1.中国海洋大学海洋地球科学学院 青岛 266100;2.海底科学与探测技术教育部重点实验室 青岛 266100;3.中国海洋大学海洋信息科学与工程学院 青岛 266100;4.青岛海洋地质研究所 青岛 266100
摘要:
长江入海泥沙是中国东部陆架海沉积物的主要来源之一。本文基于MODIS-Aqua卫星的遥感资料并结合实测悬浮体浓度,建立了基于颗粒物后向散射系数的悬浮体浓度的反演方法,获取了2002-2017年长江口海域的表层悬浮体浓度分布,并分析其在潮周期、季节内以及年际等不同时间尺度下的变化特征。结果表明,在潮周期内,长江口122.3°E以西海域表层悬浮体浓度大潮高于小潮,落潮大于涨潮,高潮大于低潮;在季节尺度内,6-8月表层悬浮体浓度逐渐增加。而122.3°E以东海域,则出现相反的情况;长江口122.3°E以西海域的夏季平均表层悬浮体浓度年际变化明显,主要受长江入海水沙量年际变化的影响。长江口122.3°E以东海域表层悬浮体浓度的年际变化几乎不受长江入海泥沙的影响。风向对悬浮体浓度的扩散具有显著的作用,南风有利于高浓度悬浮体向外海扩散,东风则抑制扩展。
关键词:  长江口  MODIS-Aqua卫星  表层悬浮体浓度  不同时间尺度
DOI:10.11693/hyhz20181100264
分类号:P736.21
基金项目:国家重点研发计划“大型水库调控下河口沉积动力过程及其生物地球化学效应”,2016YFA060093号;国家自然科学基金项目,41476030号,40906025号;泰山学者建设工程专项项目;浙江中部海岸带综合地质调查,DD20190276号。
MULTIPLE TIMESCALE VARIATION IN CONCENTRATION OF SURFACE SUSPENDED SEDIMENT IN CHANGJIANG RIVER ESTUARY
XUE Wen-Jing1,2, QIAO Lu-Lu1,2, ZHONG Yi1,2, XUE Cheng3, CHEN Shu-Guo3, LI Shu-Hao1,2, LIU Peng1,2, GAO Fei4
1.College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;2.The Key Lab of Sea Floor Resource and Exploration Technique, Ministry of Education, Qingdao 266100, China;3.College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China;4.Qingdao Institute of Marine Geology, Qingdao 266100, China
Abstract:
Suspended sediments from the Changjiang (Yangtze) River are one of the main sources of sediments onto the shelf of the East China Sea. To analyze the multiple timescale variation in concentration of the surface suspended sediment and its relevant factors in the Changjiang River estuary during 2002-2017, we developed an algorithm between particle backscattering coefficient and suspended sediment concentration with in-situ measurements and MODIS-Aqua satellite data. The results indicate that the surface suspended sediment concentration is higher in spring, ebb, and high tide than those of neap, flood, and low tide, and the concentration of surface suspended sediment increases gradually from June to August in the west of 123°E of the estuary. The opposite situation occurs in the east of 123°E of the estuary. The concentration of surface suspended sediment varies inter-annually and significantly, due to the sediment discharge in the west of 123°E of the estuary. The inter-annual variability in concentration of surface suspended sediment shows no relationship with the sediment discharge in the east of 123°E of the estuary. In addition, wind direction has a significant effect on diffusion of suspended sediment. The southerly wind contributes to the diffusion of suspended sediment, and the easterly wind inhibits the transport of suspended sediment into the sea.
Key words:  Changjiang river estuary  MODIS-Aqua satellite  surface suspended sediment  multiple timescale
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