| 摘要: |
| 为了探讨夏季不同性质悬浮体在研究区的分布特征及其控制因素,于2016年6-7月在北黄海通过LISST-100XC型激光粒度仪和CTD测量了悬浮体体积浓度和水体温度、浊度、荧光叶绿素浓度数据。结合现场水文数据对不同粒径悬浮体的分布规律进行分析,结果表明,夏季,研究区悬浮体含有大量以生源颗粒为主的粗颗粒(>128μm),其体积浓度在下层水体较低,在远岸层结水体的温跃层附近最高。粒径<128μm的细颗粒体积浓度与浊度分布趋势一致,主要反映陆源无机颗粒的变化。其体积浓度整体呈近岸高远岸低、下层高上层低的分布特征,在成山头近岸海域最高,并且在鲁北沿岸浅水与远岸深水之间存在体积浓度锋。潮混合作用和温跃层是悬浮体浓度空间分布的主要控制因素。潮混合作用促使鲁北沿岸出现陆架温度锋,阻碍沿岸细颗粒物质向海输运；成山头近岸较强的潮混合作用导致当地沉积物再悬浮,使该区域细颗粒体积浓度最高。温跃层不仅阻碍了下层细颗粒物质向上扩散,还对上层沉降下来的颗粒有“累积”作用。此外,跃层附近丰富的浮游植物对粗颗粒体积浓度高值区的形成有促进作用。 |
| 关键词: 悬浮体 粒径 北黄海 潮混合 温跃层 |
| DOI：10.11759/hykx20170301001 |
| 分类号:P736.21 |
| 基金项目:国家自然科学(41476045)；中国科学院战略性先导科技专项项目(A类)(XDA11030103) |
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| Characteristics and the control factors of suspended matter distribution in North Yellow Sea during summer |
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ZHANG Kai-nan,WANG Zhen-yan,LI Wen-jian,LIU Chang-hua,YAN Jun
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Institute of Oceanology,Chinese Academy of Sciences
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| Abstract: |
| In order to achieve a better understanding of the distribution of different kinds of suspended particulate matters (SPM) in north Yellow sea and the key factors controlled it, In Jun and July, 2016, we measured the volume concentration and size of SPM with the in-situ laser particle sizer LISST-100X(C), obtained Chlorophyll fluorescence Concentration, turbidity, temperature for the entire water column with CTD. The results indicate that coarse-particles ( >128μm ) predominated by biogenic matter account for most of the SPM, with the concentrations substantially higher around in thermocline of the stratificated offshore water. Fine-particles ( <128μm ) concentrations distribution has the same tendency with turbidity , and accordingly, mainly varifying inorganic terrigenous particles of the area . Generally, It is high along the Shandong peninsula coast and low in the offshore deep water that there’s a concentration front along the coast, while low in the upper water and high in the water below. The highest value is in the bottom near Chengshantou area. Tidal mixing and thermocline is the key factors in control of SPM distribution in study area. Tidal mixing prompted the shelf thermal fronts which prevent the coastal fine-particles from spreading seaward. The strong tidal mixing near Chengshantou area results in resuspension of the local sediments, thus the fine-particles concentration here is the highest. Thermocline not only impedes the fine-particles’s upward spreading, but also delay the settling of the particles settled from upper water. Moreover, Phytoplanktons gathered near thermocline also has a significant promoter action to the formation of high coarse-particles concentrations. |
| Key words: suspended particulate matter(SPM) particle size North Yellow Sea Tidal mixing Thermocline |