中国东部陆架海锋面的时空变化及其对细颗粒沉积物输运和沉积的影响  

Temporal and spatial variations of oceanic fronts and their impact on transportation and deposition of fine-grained sediments in the East China Shelf Seas

作　　者：袁萍[1] 王厚杰[1] 毕乃双[1] 吴晓[1] 张勇[2] YUAN Ping;WANG Houjie;BI Naishuang;WU Xiao;ZHANG Yong(College of Marine Geosciences,Ocean University of China,Key Laboratory of Submarine Geosciences and Prospecting Technique,Ministry of Education,Qingdao 266100,China;Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266071,China)

机构地区：[1]中国海洋大学海洋地球科学学院,海底科学与探测技术教育部重点实验室,青岛266100 [2]中国地质调查局青岛海洋地质研究所,青岛266071

出　　处：《海洋地质与第四纪地质》2020年第3期25-42,共18页Marine Geology & Quaternary Geology

基　　金：国家杰出青年科学基金项目“河口海岸学:现代黄河入海沉积物从源到汇的关键沉积动力过程”(41525021);国家重点研发计划项目课题“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”(2016YFA0600903)。

摘　　要：本文利用中国东部陆架海不同季节的航次观测数据与HYCOM模式数据,分析了HYCOM模式输出的水体温盐数据在中国东部陆架海的适用性,并探讨了中国东部陆架海表底层温盐锋面的时空变化及其对细颗粒沉积物输运和沉积的影响。研究结果表明,中国东部陆架海表、底层温度锋(盐度锋)的分布趋势基本一致(不考虑冲绳海槽以东的海域),但底层锋面的强度和锋区范围明显大于表层。锋面的位置很好的体现了海区流系的基本格局。表、底层温度锋面基本处于几大水团的交界处,说明表、底层温度锋面的分布与研究区环流和水团配置情况密切相关。而表、底层盐度锋面的分布则与研究区入海径流、沿岸流以及暖流等的分布密切相关。此外,对比锋面与中国东部陆架各泥质沉积区的位置可以发现,研究区温盐锋面的空间分布和季节变化对于泥质沉积区的形成具有重要的控制作用。Observed hydrologic datasets and HYCOM modelling data were used in this paper to evaluate the applicability and stability of the HYCOM temperature and salinity data to the temporal-spatial distribution of oceanic fronts and its impact on transportation and deposition of fine-grained sediments in the East China Shelf Seas.The results show that the distribution of thermal fronts or salinity fronts are similar on the surface and bottom in the Bohai,Yellow and East China Seas excluding the east of Okinawa Trough.However,the strength and coverage of the fronts on the bottom are larger than those on the surface.The location of thermal fronts depends on the basic structure of currents.Both the surface and bottom thermal fronts develop along the boundaries of water masses,suggesting that thermal current fronts are closely related to the current and water masses of the study area.However,the distribution of the salinity fronts is greatly influenced by water discharge,coastal currents and warm currents.In addition,the distribution of mud patches in the Eastern China Shelf Sea are closely related to the patterns of oceanic fronts,which means that the thermal and salinity fronts do play a critical role in the formation of mud deposits.

关 键 词：中国东部陆架海 锋面 时空变化 细颗粒沉积物 沉积物输运 泥质沉积区 

分 类 号：P76[天文地球—海洋科学]