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Impact of wind and tides on the Lena River freshwater plume dynamics in the summer season

机译：夏季风潮对莉娜河淡水羽流动力学的影响

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摘要

The Lena plume dynamics in the Lena Delta region of the Laptev Sea are explored in simulations performed with the Finite Volume Coastal Ocean Model (FVCOM) on a mesh with the horizontal resolution 0.4-5 km. The impact of wind and tides on the Lena plume propagation is analysed based on simulations for the summer season of 2008 and also on idealised experiments. All main Lena River freshwater channels (Trofimovskaya, Bykovskaya, Tumatskaya and Olenekskaya) produce buoyant outflows in the summer season. The surface plume buoyancy signature proves to be highly variable in time, especially in case of upwelling favourable wind events. Winds stronger than 6 m s(-1) can already turn the dynamics of flows from all main freshwater channels to the wind-driven state. During the summer season, the bulk of freshwater from the Lena River stays in the eastern Laptev Sea because of location of the main Lena River freshwater channels, their large Kelvin numbers and light summer winds. Westward and northward plume excursions are wind-driven, and the model skill in simulating them depends on the available wind forcing. The main mechanism of tidal influence in the freshwater plume zone is through tidally induced mixing, except for the northern vicinity of the delta, where residual circulation may contribute to the plume eastward transport significantly.
机译：在有限分辨率沿海海洋模型（FVCOM）在水平分辨率为0.4-5 km的网格上进行的模拟中，探索了Laptev海的Lena三角洲地区的Lena羽流动力学。基于2008年夏季的模拟以及理想化的实验，分析了风和潮汐对Lena羽流传播的影响。夏季，莉娜河的所有主要淡水河道（Trofimovskaya，Bykovskaya，Tumatskaya和Olenekskaya）都会产生旺盛的排水量。事实证明，表层羽流的浮力特征随时间变化很大，特别是在上升有利风事件的情况下。大于6 m s（-1）的风已经可以将所有主要淡水通道的流动动力学转变为风驱动状态。在夏季，由于主要的莉娜河淡水河道的位置，开尔文数量大和夏季风轻，来自莉娜河的大部分淡水留在了拉普捷夫海东部。向西和向北的羽流漂移是由风驱动的，模拟它们的模型技巧取决于可用的风力。潮汐影响淡水羽流带的主要机制是通过潮汐诱发的混合作用，除了三角洲北部附近，剩余的循环可能对羽流东移有很大作用。

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  • 来源
    《Ocean Dynamics》 |2015年第7期|951-968|共18页
  • 作者

    Fofonova Vera; Danilov Sergey; Androsov Alexey; Janout Markus; Bauer Martin; Overduin Paul; Itkin Polona; Wiltshire Karen Helen;

  • 作者单位

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-25992 List Auf Sylt, Germany|Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-27570 Bremerhaven, Germany;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-27570 Bremerhaven, Germany;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-27570 Bremerhaven, Germany;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-27570 Bremerhaven, Germany;

    Univ Trier, Dept Environm Meteorol, D-54286 Trier, Germany;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-14473 Potsdam, Germany;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-27570 Bremerhaven, Germany;

    Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-25992 List Auf Sylt, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laptev Sea shelf; Lena Delta; Freshwater plume; Shelf dynamics; Tidal dynamics;

    机译：拉普捷夫海架;利纳三角洲;淡水羽流;层架动力学;潮汐动力学;

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