scholarly journals Flow paths and variability of the North Atlantic Current: A comparison of observations and a high-resolution model

2017 ◽  
Vol 122 (4) ◽  
pp. 2686-2708 ◽  
Author(s):  
Tilia Breckenfelder ◽  
Monika Rhein ◽  
Achim Roessler ◽  
Claus W. Böning ◽  
Arne Biastoch ◽  
...  
Keyword(s):  
High Resolution ◽  
North Atlantic ◽  
North Atlantic Current ◽  
Flow Paths ◽  
The North ◽  
Resolution Model ◽  
High Resolution Model ◽  
The North Atlantic ◽  
Atlantic Current

scholarly journals Effects of High Resolution and Spinup Time on Modeled North Atlantic Circulation

2019 ◽  
Vol 49 (5) ◽  
pp. 1159-1181 ◽  
Author(s):  
Christopher Danek ◽  
Patrick Scholz ◽  
Gerrit Lohmann
Keyword(s):  
High Resolution ◽  
North Atlantic ◽  
Horizontal Resolution ◽  
Quasi Equilibrium ◽  
Low Resolution ◽  
The North ◽  
Resolution Model ◽  
High Horizontal Resolution ◽  
High Resolution Model ◽  
The North Atlantic

AbstractThe influence of a high horizontal resolution (5–15 km) on the general circulation and hydrography in the North Atlantic is investigated using the Finite Element Sea Ice–Ocean Model (FESOM). We find a stronger shift of the upper-ocean circulation and water mass properties during the model spinup in the high-resolution model version compared to the low-resolution (~1°) control run. In quasi equilibrium, the high-resolution model is able to reduce typical low-resolution model biases. Especially, it exhibits a weaker salinification of the North Atlantic subpolar gyre and a reduced mixed layer depth in the Labrador Sea. However, during the spinup adjustment, we see that initially improved high-resolution features partially reduce over time: the strength of the Atlantic overturning and the path of the North Atlantic Current are not maintained, and hence hydrographic biases known from low-resolution ocean models return in the high-resolution quasi-equilibrium state. We identify long baroclinic Rossby waves as a potential cause for the strong upper-ocean adjustment of the high-resolution model and conclude that a high horizontal resolution improves the state of the modeled ocean but the model integration length should be chosen carefully.

scholarly journals Instability-Driven Benthic Storms below the Separated Gulf Stream and the North Atlantic Current in a High-Resolution Ocean Model

2018 ◽  
Vol 48 (10) ◽  
pp. 2283-2303 ◽  
Author(s):  
René Schubert ◽  
Arne Biastoch ◽  
Meghan F. Cronin ◽  
Richard J. Greatbatch
Keyword(s):  
Energy Transfer ◽  
High Resolution ◽  
Kinetic Energy ◽  
North Atlantic ◽  
Gulf Stream ◽  
Eddy Kinetic Energy ◽  
North Atlantic Current ◽  
The North ◽  
The North Atlantic ◽  
Atlantic Current

AbstractBenthic storms are important for both the energy budget of the ocean and for sediment resuspension and transport. Using 30 years of output from a high-resolution model of the North Atlantic, it is found that most of the benthic storms in the model occur near the western boundary in association with the Gulf Stream and the North Atlantic Current, in regions that are generally collocated with the peak near-bottom eddy kinetic energy. A common feature is meander troughs in the near-surface jets that are accompanied by deep low pressure anomalies spinning up deep cyclones with near-bottom velocities of up to more than 0.5 m s−1. A case study of one of these events shows the importance of both baroclinic and barotropic instability of the jet, with energy being extracted from the jet in the upstream part of the meander trough and partly returned to the jet in the downstream part of the meander trough. This motivates examining the 30-yr time mean of the energy transfer from the (annual mean) background flow into the eddy kinetic energy. This quantity is shown to be collocated well with the region in which benthic storms and large increases in deep cyclonic relative vorticity occur most frequently, suggesting an important role for mixed barotropic–baroclinic instability-driven cyclogenesis in generating benthic storms throughout the model simulation. Regions of the largest energy transfer and most frequent benthic storms are found to be the Gulf Stream west of the New England Seamounts and the North Atlantic Current near Flemish Cap.

Dissecting the Barotropic Transport in a High-resolution ocean model

2020 ◽  
Author(s):  
Martin Claus ◽  
Yuan Wang ◽  
Richard Greatbatch ◽  
Jinyu Sheng
Keyword(s):  
High Resolution ◽  
North Atlantic ◽  
Spatial Scales ◽  
Ocean Model ◽  
Water Model ◽  
North Atlantic Current ◽  
The North ◽  
Circulation Patterns ◽  
Resolution Model ◽  
High Resolution Model

<p>We present a method to decompose the time mean vertically averaged transport, as simulated by an high-resolution ocean model, into its four dominant components. These components are driven by the gradient of potential energy per unit area (PE), the divergence of the flux of time mean momentum (MMF) and eddy momentum (EMF), and the wind stress. Since the local vorticity budget and the bathymetry are noisy and dominated by small spatial scales, a barotropic shallow water model is used as a filter to diagnose the respective transports instead of integrating along lines of constant f/H.<br>Applying this method to the output of a high-resolution model of the North Atlantic we find that PE is the most important driver, including the northwest corner. MMF is an important driver of transport around the Labrador Sea continental slope and, together with the EMF, it drives significant transport along the path of the Gulf Stream and North Atlantic current. Additionally, the circulation patterns driven by the EMF compares well with an estimate based on a satellite product. Hence, the presented method provides insights into the relative importance of the different dynamical processes that may drive barotropic transport in an ocean model. But it may also be used to isolate potential issues if a model misrepresents the barotropic transport.</p>

scholarly journals Decomposition of the Mean Barotropic Transport in a High‐Resolution Model of the North Atlantic Ocean

2017 ◽  
Vol 44 (22) ◽  
pp. 11,537-11,546 ◽  
Author(s):  
Yuan Wang ◽  
Martin Claus ◽  
Richard J. Greatbatch ◽  
Jinyu Sheng
Keyword(s):  
High Resolution ◽  
Atlantic Ocean ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
The North ◽  
Resolution Model ◽  
High Resolution Model ◽  
The Mean ◽  
The North Atlantic

The North Atlantic inflow to the Arctic Ocean: High-resolution model study

2010 ◽  
Vol 79 (1-2) ◽  
pp. 1-22 ◽  
Author(s):  
Yevgeny Aksenov ◽  
Sheldon Bacon ◽  
Andrew C. Coward ◽  
A.J. George Nurser
Keyword(s):  
High Resolution ◽  
Arctic Ocean ◽  
North Atlantic ◽  
The Arctic ◽  
The North ◽  
Model Study ◽  
The Arctic Ocean ◽  
Resolution Model ◽  
High Resolution Model ◽  
The North Atlantic

scholarly journals High-Resolution Ocean Model Captures Large-Scale Heat Transport

Eos ◽  
2016 ◽  
Author(s):  
Sarah Stanley
Keyword(s):  
High Resolution ◽  
Heat Transport ◽  
North Atlantic ◽  
Large Scale ◽  
Ocean Model ◽  
Sea Surface ◽  
The North ◽  
Resolution Model ◽  
High Resolution Model ◽  
The North Atlantic

A lower-resolution model is sufficient to capture air-sea interactions, but a high-resolution model better simulates average sea surface temperatures in the North Atlantic.

scholarly journals Tuning and assessment of the HYCOM-NORWECOM V2.1 biogeochemical modeling system for the North Atlantic and Arctic oceans

2015 ◽  
Vol 8 (7) ◽  
pp. 2187-2202 ◽  
Author(s):  
A. Samuelsen ◽  
C. Hansen ◽  
H. Wehde
Keyword(s):  
High Resolution ◽  
North Atlantic ◽  
The Arctic ◽  
Data Set ◽  
Atlantic Sector ◽  
The North ◽  
Resolution Model ◽  
High Resolution Model ◽  
The North Atlantic

Abstract. The HYCOM-NORWECOM (HYbrid Coordinate Ocean Model–NORWegian ECOlogical Model) modeling system is used both for basic research and as a part of the forecasting system for the Arctic Marine Forecasting Centre through the MyOcean project. Here we present a revised version of this model. The present model, as well as the sensitivity simulations leading up to this version, have been compared to a data set of in situ measurements of nutrient and chlorophyll from the Norwegian Sea and the Atlantic sector of the Arctic Ocean. The model revisions having the most impact included adding diatoms to the diet of microzooplankton, increasing microzooplankton grazing rate and decreasing the silicate-to-nitrate ratio in diatoms. Model runs are performed both with a coarse- (~ 50 km) and higher-resolution (~ 15 km) model configuration, both covering the North Atlantic and Arctic oceans. While the new model formulation improves the results in both the coarse- and high-resolution model, the nutrient bias is smaller in the high-resolution model, probably as a result of the better resolution of the main processes and improved circulation. The final revised version delivers satisfactory results for all three nutrients as well as improved results for chlorophyll in terms of the annual cycle amplitude. However, for chlorophyll the correlation with in situ data remains relatively low. Besides the large uncertainties associated with observational data this is possibly caused by the fact that constant C:N- and Chl:N ratios are implemented in the model.

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