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A box model to represent estuarine dynamics in mesoscale resolution ocean models
Ocean Modelling ( IF 3.2 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.ocemod.2020.101587
Giorgia Verri , Nadia Pinardi , Frank Bryan , Yu-heng Tseng , Giovanni Coppini , Emanuela Clementi

Abstract Representing the net freshwater flux at river mouths is challenging for global and regional scale ocean modelling. Although rivers are well known to affect both the coastal and basin-wide circulation and dynamics, coarse resolution ocean models cannot resolve the estuarine dynamics and are usually forced at river outlets in a simplistic way, with climatological runoff and zero or constant salinity values. The aim of this study is to provide a more realistic representation of the estuarine water inputs to a coarse but eddy-resolving regional model. First, the river volume transport and salinity values at the outlets are modelled with three different Estuary Box Models (EBMs) for stratified estuaries: the Knudsen relations model, a published EBM, called UCONN-NCAR EBM, which parameterizes the tidal inflow and mixing inside the estuary, and a new model, called CMCC-EBM. The CMCC EBM has been conceived to represent the estuarine processes coupled to a mesoscale resolving hydrodynamic model that resolves the entering flow field at the estuary mouth and it offers a new representation of the tidal inflow and a new salinity tidal mixing parameterization via horizontal diffusive processes. The Ofanto and Po rivers flowing into the Adriatic Sea (northern part of the central Mediterranean Sea) are selected as case studies. The coupling of the eddy resolving ocean model to the CMCC EBM is found to outperform the one with the UCONN-NCAR EBM in the region of freshwater influence on the shelf areas.

中文翻译:

在中尺度分辨率海洋模型中表示河口动力学的框模型

摘要 表示河口净淡水通量对于全球和区域尺度的海洋建模具有挑战性。尽管众所周知河流会影响沿海和流域范围的环流和动力学,但粗分辨率海洋模型无法解析河口动力学,并且通常以简单的方式强制在河流出口处,具有气候径流和零或恒定盐度值。本研究的目的是为粗糙但具有涡旋分辨率的区域模型提供河口水输入的更真实的表示。首先,出口处的河流流量和盐度值使用三个不同的河口箱模型 (EBM) 建模,用于分层河口:Knudsen 关系模型,已发布的 EBM,称为 UCONN-NCAR EBM,它参数化潮汐流入和内部混合河口,以及一种名为 CMCC-EBM 的新模型。CMCC EBM 被设想为代表与中尺度解析流体动力学模型耦合的河口过程,该模型解析了河口入口处的进入流场,它通过水平扩散过程提供了潮汐流入的新表示和新的盐度潮汐混合参数化。流入亚得里亚海(地中海中部北部)的奥凡托河和波河被选为案例研究。涡旋解析海洋模型与 CMCC EBM 的耦合被发现在淡水对陆架区域的影响区域优于 UCONN-NCAR EBM。CMCC EBM 被设想为代表与中尺度解析流体动力学模型耦合的河口过程,该模型解析了河口入口处的进入流场,它通过水平扩散过程提供了潮汐流入的新表示和新的盐度潮汐混合参数化。流入亚得里亚海(地中海中部北部)的奥凡托河和波河被选为案例研究。涡旋解析海洋模型与 CMCC EBM 的耦合被发现在淡水对陆架区域的影响区域优于 UCONN-NCAR EBM。CMCC EBM 被设想为代表与中尺度解析流体动力学模型耦合的河口过程,该模型解析了河口入口处的进入流场,它通过水平扩散过程提供了潮汐流入的新表示和新的盐度潮汐混合参数化。流入亚得里亚海(地中海中部北部)的奥凡托河和波河被选为案例研究。涡旋解析海洋模型与 CMCC EBM 的耦合被发现在淡水对陆架区域的影响区域优于 UCONN-NCAR EBM。流入亚得里亚海(地中海中部北部)的奥凡托河和波河被选为案例研究。涡旋解析海洋模型与 CMCC EBM 的耦合被发现在淡水对陆架区域的影响区域优于 UCONN-NCAR EBM。流入亚得里亚海(地中海中部北部)的奥凡托河和波河被选为案例研究。涡旋解析海洋模型与 CMCC EBM 的耦合被发现在淡水对陆架区域的影响区域优于 UCONN-NCAR EBM。
更新日期:2020-04-01
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