Formation and Dynamics of a Coherent Coastal Freshwater Influenced System
Formation and Dynamics of a Coherent Coastal Freshwater Influenced System
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相干沿海淡水影响系统的形成和动力学
DOI：
10.1029/2023ea002872
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发表时间：
2024
影响因子：
3.1
通讯作者：
Barton B
中科院分区：
文献类型：
--
作者：
Barton B
在西北欧大陆架，河流为沿海提供淡水。在没有有效的海岸分辨率的海洋模型中，这种沿海淡水可能会被歪曲。这留下了一个未解的问题：苏格兰周围是否保留了淡水，是什么影响了它的变化？在这里，我们部署并运行一个具有增强沿海分辨率的非结构化模型，以模拟1993年至2019年的西北欧大陆架，苏格兰大陆架水再分析服务（SSW-RS）长期运行。模型网格的非结构化性质意味着它比7公里结构化网格模型（大西洋边缘模型7公里）更准确地捕捉沿海水域的“气泡”。SSW-RS中的表面盐度显示了苏格兰西部和北部海岸80公里内的盐度锋，这些盐度锋在奥克尼东部分解。在某些时期，沿海盐度较高，这时淡水被更积极地平流输送离开海岸。经验正交函数统计分析表明，表层盐度的前两个模态解释了66%的方差。第一模态与北大西洋涛动和盐度驱动的速度变率相关，通过平流和扩散改变盐度。第二种模式与埃克曼运输变异性，苏格兰北部作为一个楔子，造成两极动态的任何一方。淡水被困在西部，而来自北部的盐水减少了通往北海的淡水通道。这对盐度分布、北海分层、海洋生境和锋面输送都很重要。
On the Northwest European Shelf rivers provide freshwater to the coastal seas. This coastal freshwater can be misrepresented in ocean models without effective coastal resolution. This leaves an unanswered question; is freshwater retained around Scotland and what affects its variability? Here, we deploy and run an unstructured model with enhanced coastal resolution to simulate the Northwest European Shelf from 1993 to 2019, the Scottish Shelf Water‐Reanalysis Service (SSW‐RS) long‐time run. The unstructured nature of the model grid means it more accurately captures a “bubble” of Coastal Water than a 7 km structured grid model (the Atlantic Margin Model 7 km). Surface salinity in the SSW‐RS shows salinity fronts within 80 km of the coast around west and north Scotland that disintegrates east of Orkney. There are periods characterized by high coastal salinity when freshwater is more actively advected away from the coast. Empirical orthogonal function statistical analysis shows the first two modes in surface salinity account for 66% of the variance. The first mode correlates with North Atlantic Oscillation and the salinity driven velocity variability which change the salinity through advection and diffusion. The second mode correlates with Ekman transport variability where the north of Scotland acts as a wedge causing bipolar dynamics either side. Freshwater is trapped in the west, while saline water from the north reduces the freshwater pathway to the North Sea. This is important for salinity distribution, stratification in the North Sea, marine habitats and frontal transport.
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影响因子：
4.6
作者：
Henry LA;Mayorga-Adame CG;Fox AD;Polton JA;Ferris JS;McLellan F;McCabe C;Kutti T;Roberts JM
通讯作者：
Roberts JM
影响因子：
2.9
作者：
J. Sündermann;T. Pohlmann
通讯作者：
T. Pohlmann
DOI：
10.1029/2019jc015449
发表时间：
2019-04
期刊：
Journal of Geophysical Research: Oceans
影响因子：
--
作者：
B. Barton;C. Lique;Y. Lenn
通讯作者：
B. Barton;C. Lique;Y. Lenn
影响因子：
2.8
作者：
A. Souza;J. Simpson
通讯作者：
A. Souza;J. Simpson
影响因子：
3.5
作者：
A. Thompson;A. N. Garabato
通讯作者：
A. Thompson;A. N. Garabato