Suspended particulate matter on the Laptev Sea shelf (Siberian Arctic) during ice-free conditions
Suspended particulate matter on the Laptev Sea shelf (Siberian Arctic) during ice-free conditions
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DOI：
10.1016/s0272-7714(02)00328-1
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发表时间：
2003-05
影响因子：
2.8
通讯作者：
C. Wegner;J. Hölemann;I. Dmitrenko;S. Kirillov;K. Tuschling;E. Abramova;H. Kassens
中科院分区：
文献类型：
--
作者：
C. Wegner;J. Hölemann;I. Dmitrenko;S. Kirillov;K. Tuschling;E. Abramova;H. Kassens
光学浊度调查结合色素，浮游生物，和电流测量被用来调查悬浮颗粒物（SPM）在拉普捷夫海，西伯利亚最大的陆架海之一，在无冰期的垂直和水平动态。光学测量设备被证明是一个很好的工具来测量SPM分布在真实的时间。由于水样和光学后向散射的高度相关性，SPM浓度被量化。因此，底雾状层的形成和分布，一个层的SPM浓度增加，其意义上的沉积物输运的拉普捷夫海陆架上可以描述。拉普捷夫海东部和中部存在两个云状层。表层的形成和浓度主要与浮游植物和浮游动物的数量有关。然而，在Lena三角洲附近，浓度强烈依赖于河流排放。底部云状层建议开发期间和短暂的春季解体后，约60%的平均年沉积物输入被排放到货架上。SPM散布在货架上，并在底层保持悬浮状态。特别是在无冰期，几乎没有沉积发生。然而，底部物质再悬浮，由于风引起的增加的底层电流，主要是在古河谷和浅滩。在无冰期，山谷作为输送管道，SPM在山谷中发生转移。StolboiltBank附近的中间层可能是由底层从地形高点向山谷的位移造成的。结合浊度和电流的测量表明，大部分的沉积物运输在拉普捷夫海陆架发生在底部的霞状层。
Optical turbidity surveys combined with pigment, plankton, and current measurements were used to investigate the vertical and horizontal dynamics of suspended particulate matter (SPM) in the Laptev Sea, one of the largest Siberian shelf seas, during the ice-free period. Optical measuring devices prove to be an excellent tool to measure SPM distribution in real time. SPM concentrations were quantified owing to the high correlation of water samples and optical backscatter. Thus, the formation and distribution of the bottom nepheloid layer, a layer of increased SPM concentration, and its significance for the sediment transport on the Laptev Sea shelf can be described. Two nepheloid layers exist in the eastern and central Laptev Sea. Formation and concentration of the surface layer are mainly related to the amount of phytoplankton and zooplankton occurrence. However, in the vicinity of the Lena Delta, the concentration is strongly dependent on riverine discharge. The bottom nepheloid layer is suggested to develop during and briefly after the spring breakup, when about 60% of the mean annual sediment input is discharged onto the shelf. SPM spreads over the shelf and is kept in suspension within the bottom layer. Especially during the ice-free period, almost no sedimentation takes place. However, bottom material is resuspended due to wind-induced increased bottom currents, mainly in paleo-river valleys and on shoals. Valleys act as transport conduits during the ice-free period and SPM is shifted within them. An intermediate layer near Stolbovoy Bank is probably caused by the displacement of the bottom layer from the topographic highs into the valleys. The combined turbidity and current measurements indicate that most of the sediment transport on the Laptev Sea shelf takes place in the bottom nepheloid layer.