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基于遥感反演的山东半岛东北部海域悬浮体时空变化规律探讨
刘焘, 朱龙海, 胡日军, 尹砚军, 冷星
中国海洋大学海洋地球科学学院
摘要:
本文基于2003-2018年MODIS卫星遥感影像资料,结合2018年春季、夏季和冬季大面站悬浮体取样分析结果,构建了表层悬浮体浓度遥感反演模型;在此基础上,分析了山东半岛东北部海域年际和月份表层悬浮体浓度时空分布规律,探讨了表层悬浮体浓度变化的主控因素和水体结构季节变化及其对悬浮体分布输运的影响。结果表明:山东半岛东北部海域表层悬浮体总体呈近岸高远岸低的分布特征,东部成山头区域悬浮体浓度较高且向海扩散较远,西部威海湾及外侧海域悬浮体浓度较低且扩散范围小于东部。研究区悬浮体浓度季节性变化显著但对应季节年度变化较小,冬季悬浮体浓度达到最大,春秋季次之,夏季最低。研究区春季、秋季和冬季表层悬浮体浓度主要受控于北向风浪和潮流,而夏季悬浮体浓度主要受潮流控制。夏季,温跃层阻碍了悬浮体垂向扩散,导致表层悬浮体浓度极低;冬季,研究区东部成山头附近水平分布的弱温跃层虽然会在一定程度上抑制悬浮体的再悬浮,但再悬浮扩散仍是造成研究区高悬浮体浓度的主要因素。山东半岛东北部存在类似“夏储冬输”的特征,海底沉积物再悬浮物质及成山头附近悬浮体的水平扩散是研究区悬浮体的主要来源。
关键词:  山东半岛  遥感反演  悬浮体浓度  时空变化
DOI:10.11693/hyhz20200900268
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
相关附件:   图件  版权转让扫描  图件  版权转让扫描  图件修改  图件  附件1
STUDY ON TEMPORAL AND SPATIAL VARIATION OF SUSPENDED MATTER IN THE NORTHEAST SHANDONG PENINSULA BASED ON REMOTE SENSING INVERSION
LIU Tao, ZHU Long-Hai, HU Ri-Jun, YING Yan-Jun, Leng Xing
College of Marine Geoscience,Ocean University of China
Abstract:
Based on MODIS satellite remote sensing image data from 2003 to 2018 and combined with suspension sampling analysis results of large surface stations in spring, summer and winter of 2018, this paper constructed a remote sensing inversion model for surface suspension concentration.On this basis, the temporal and spatial distribution of surface suspension concentration in the sea area of northeast Shandong Peninsula is analyzed, and the main controlling factors of surface suspension concentration change and seasonal changes of water structure as well as their influence on the distribution and transport of suspended matter are discussed.The results show that the surface suspension in the northeast sea area of Shandong Peninsula is generally distributed near shore higher than far shore lower, the concentration of suspension in the eastern Chenshan area is higher and spreads far to the sea, and the concentration of suspension in the western Weihai Bay and the outer sea area is lower and the diffusion range is smaller than that in the eastern sea.The concentration of suspended matter in the study area has a significant seasonal change, but the corresponding seasonal annual change is small, the concentration of suspended matter reaches the maximum in winter, followed by spring and autumn, and the lowest in summer.The surface suspension concentration in spring, autumn and winter in the study area is mainly controlled by northerly wind waves and tidal currents, while the concentration in summer is mainly controlled by tidal currents.In summer, the thermocline obstructs the vertical diffusion of suspension, resulting in extremely low surface suspension concentration.In winter, the weak thermocline distributed horizontally near the Chenshan in the east of the study area can inhibit the re-suspension to a certain extent, but the re-suspension diffusion is still the main factor causing the high concentration of suspended matter in the study area.Similar characteristics of "summer storage and winter transport" exist in the northeastern part of Shandong Peninsula, and the horizontal diffusion of suspended matter in seabed sediments and near Chenshan are the main sources of suspended matter in the study area.
Key words:  Shandong Peninsula  remote sensing inversion  suspension concentration  change of time and space
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