Planetary and Topographic Beta Effects on the Northern Canary Current System (NCCS) PDF Download
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Author: Wendy A. Towle Publisher: ISBN: 9781423523710 Category : Languages : en Pages : 97
Book Description
To investigate planetary and topographic beta effects on classical as well as unique features in the northern Canary Current system (NCCS), several numerical experiments using the Princeton Ocean Model are explored To isolate the dependence of Coriolis parameterization (beta-plane vs, f-plane) from the topographic beta effect, the first (last) two experiments use a flat bottom (topography), In all experiments, classical eastern boundary condition (EBC) features are produced including an offshore surface equatorward meandering jet, coastal surface and subsurface poleward currents, upwelling, meanders, eddies and filaments, Due to the beta effect, the surface coastal jet does not have to be confined to within a Rossby radius of deformation of the coast, The beta effect also plays an important role in the development and westward propagation of Meddies, a unique feature of the NCCS, Bottom topography is shown to play an important role in narrowing, intensifying, and trapping coastal currents, These results show that, while wind forcing is the primary mechanism for generating classical EEC features, planetary and topographic beta also play important roles in the generation, evolution, and maintenance of classical as well as unique features in the NCCS,
Author: Wendy A. Towle Publisher: ISBN: 9781423523710 Category : Languages : en Pages : 97
Book Description
To investigate planetary and topographic beta effects on classical as well as unique features in the northern Canary Current system (NCCS), several numerical experiments using the Princeton Ocean Model are explored To isolate the dependence of Coriolis parameterization (beta-plane vs, f-plane) from the topographic beta effect, the first (last) two experiments use a flat bottom (topography), In all experiments, classical eastern boundary condition (EBC) features are produced including an offshore surface equatorward meandering jet, coastal surface and subsurface poleward currents, upwelling, meanders, eddies and filaments, Due to the beta effect, the surface coastal jet does not have to be confined to within a Rossby radius of deformation of the coast, The beta effect also plays an important role in the development and westward propagation of Meddies, a unique feature of the NCCS, Bottom topography is shown to play an important role in narrowing, intensifying, and trapping coastal currents, These results show that, while wind forcing is the primary mechanism for generating classical EEC features, planetary and topographic beta also play important roles in the generation, evolution, and maintenance of classical as well as unique features in the NCCS,
Author: Patrick J. Murray Publisher: ISBN: 9781423536468 Category : Languages : en Pages : 114
Book Description
To investigate the role of planetary beta on classical as well as unique features in the northern Canary Current System (NCCS), four numerical experiments are conducted with varying Coriolis parameterizations (f-plane or beta plane). The first two experiments use a closed boundary and annual salinity forcing for the Mediterranean Outflow (MO). The latter two experiments use an open Mediterranean Sea at the Strait of Gibraltar and seasonal forcing for MO to permit a more accurate investigation of the role of the beta effect on subsurface spreading of MO and Meddies. All four experiments use seasonal climatological winds and seasonal thermohaline gradients along the western boundary to force the model. Experiments run on a beta-plane (Experiments 2 and 4) accurately portray classical eastern boundary current (EBC) mesoscale features. In addition, these experiments depict unique NCCS features associated with a large embayment (the Gulf of Cadiz), poleward spreading of MO, and the generation of Meddies. Experiments run on an f-plane (Experiments 1 and 3) show the unrealistic dominance of a continuously strengthening equatorward jet that inhibits development of classical EBC and unique NCCS features. The complex upper layer and subsurface flow regimes of Experiment 4 most realistically portray currents, mesoscale features and Meddies similar to NCCS observations.
Author: Troy J. Tworek Publisher: ISBN: 9781423534174 Category : Eddies Languages : en Pages : 182
Book Description
To investigate the effect of the role played by planetary beta in the generation and maintenance of the Leeuwin Current System (LCS), several numerical experiments are conducted with varying Coriolis parameterizations (f- plane or beta-plane). The seasonal effects of thermal gradients, wind forcing and North West Shelf (NWS) waters are also systematically explored in the numerical experiments. Additionally, the generation mechanisms for undercurrents along both the western and southern coasts of Australia are investigated. Although surface currents, undercurrents, and mesoscale activity are present in both the f-plane and beta-plane experiments, those run on a beta-plane show a more realistic depiction of these features due to the significant role played by the planetary beta effect in the LCS. The combination of thermal forcing, wind forcing, and NWS waters were found to be essential to maintain the highly seasonally varying LCS. Alongshore temperature gradients, which are generated at deeper levels by the strong flow of the Leeuwin Current, are sufficient to establish and maintain an equatorward (westward) undercurrent along western (southern) Australia.
Author: Patrick J. Murray Publisher: ISBN: Category : Languages : en Pages : 98
Book Description
To investigate the role of planetary beta on classical as well as unique features in the northern Canary Current System (NCCS), four numerical experiments are conducted with varying Coriolis parameterizations (f-plane or beta plane). The first two experiments use a closed boundary and annual salinity forcing for the Mediterranean Outflow (MO). The latter two experiments use an open Mediterranean Sea at the Strait of Gibraltar and seasonal forcing for MO to permit a more accurate investigation of the role of the beta effect on subsurface spreading of MO and Meddies. All four experiments use seasonal climatological winds and seasonal thermohaline gradients along the western boundary to force the model. Experiments run on a beta-plane (Experiments 2 and 4) accurately portray classical eastern boundary current (EBC) mesoscale features. In addition, these experiments depict unique NCCS features associated with a large embayment (the Gulf of Cadiz), poleward spreading of MO, and the generation of Meddies. Experiments run on an f-plane (Experiments 1 and 3) show the unrealistic dominance of a continuously strengthening equatorward jet that inhibits development of classical EBC and unique NCCS features. The complex upper layer and subsurface flow regimes of Experiment 4 most realistically portray currents, mesoscale features and Meddies similar to NCCS observations.
Author: Daniel W. Bryan Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
A high-resolution, multi-level, primitive equation ocean model is used to investigate the roles of wind forcing and irregular coastline geometry in the generation of currents, eddies, jets and filaments in the Canary Current System (CCS) from 30 to 42.5 deg N. To study the generation, evolution, and sustainment of the currents, eddies, jets and filaments in the CCS, the model is forced from rest using seasonal climatological winds and a realistic coastline. Results of the experiment show that wind forcing alone is capable of generating surface currents, undercurrents, meanders, eddies, and filaments. Preferred eddy generation locations, enhanced growth of meanders, eddies, and filaments are seen. The features produced by the model are consistent with available observations of the CCS.
Author: Daniel Bryan Publisher: ISBN: 9781423559399 Category : Languages : en Pages : 96
Book Description
A high-resolution, multi-level, primitive equation ocean model is used to investigate the roles of wind forcing and irregular coastline geometry in the generation of currents, eddies, jets and filaments in the Canary Current System (CCS) from 30 to 42.5 deg N. To study the generation, evolution, and sustainment of the currents, eddies, jets and filaments in the CCS, the model is forced from rest using seasonal climatological winds and a realistic coastline. Results of the experiment show that wind forcing alone is capable of generating surface currents, undercurrents, meanders, eddies, and filaments. Preferred eddy generation locations, enhanced growth of meanders, eddies, and filaments are seen. The features produced by the model are consistent with available observations of the CCS.
Author: P. Ted Strub Publisher: Elsevier Inc. Chapters ISBN: 0128058633 Category : Science Languages : en Pages : 107
Book Description
In this chapter, we review the physical processes that create the mean and variable circulation features along the eastern margins of the ocean basins. Rather than describing the individual systems, we describe the processes and their variability between the systems, dividing the discussion into the low-, mid- and high-latitude regions. We start with the low latitudes, since their signals often move poleward along the coastal wave guides into the midlatitudes, which are the well-known eastern boundary upwelling systems. Our treatment of the higher latitudes is limited to examples from the better-studied NE Pacific Basin (The Alaska Current).
Author: Ross P. Mitchell Publisher: ISBN: Category : California Current Languages : en Pages : 136
Book Description
A high-resolution, multi-level, primitive equation ocean model is used to examine the response of an idealized, flat-bottomed, eastern boundary oceanic regime on a beta-plane to both steady and seasonally-varying climatological wind forcing. The focus of the study is the California Current System along the coastal region, from 35 deg N to 45 deg N, off the Western United States. With steady equatorward wind forcing, a surface equatorward current and poleward undercurrent develop. Eddies form around days 60 and 7 with initial development in the northern region of the domain. The strong meandering current continues to grow throughout the 360 days of model time and can produce eddies that have wavelengths up to 200 km and can propagate at least -200 km offshore. When the alongshore component of the temporally averaged seasonally varying climatological wind forcing is used, there is a weak poleward undercurrent and equatorward surface current. There is weak upwelling and very little eddy activity with the eddies only propagating to -100 km offshore. When alongshore component of the time-dependent wind forcing with spatial variability in latitude is used, a surface equatorward jet, poleward undercurrent and eddies are generated. The eddies form throughout the domain in this experiment due to a competition between the 0-plan effect and the continuous and stronger equatorward wind forcing in the southern portion of the domain. The eddies in this experiment propagate at least -150 km from shore.
Author: Shiro Imawaki Publisher: Elsevier Inc. Chapters ISBN: 0128058625 Category : Science Languages : en Pages : 90
Book Description
Strong, persistent currents along the western boundaries of the world’s major ocean basins are called “western boundary currents” (WBCs). This chapter describes the structure and dynamics of WBCs, their roles in basin-scale circulation, regional variability, and their influence on atmosphere and climate. WBCs are largely a manifestation of wind-driven circulation; they compensate the meridional Sverdrup transport induced by the winds over the ocean interior. Some WBCs also play a role in the global thermohaline circulation, through inter-gyre and inter-basin water exchanges. After separation from the boundary, most WBCs have zonal extensions, which exhibit high eddy kinetic energy due to flow instabilities, and large surface fluxes of heat and carbon dioxide. The WBCs described here in detail are the Gulf Stream, Brazil and Malvinas Currents in the Atlantic, the Somali and Agulhas Currents in the Indian, and the Kuroshio and East Australian Current in the Pacific Ocean.
Author: Wendy A. Towle
Author: Wendy A. Towle
Author: Patrick J. Murray
Author: Troy J. Tworek
Author: Patrick J. Murray
Author: Daniel W. Bryan
Author: Daniel Bryan
Author: P. Ted Strub
Author: Ross P. Mitchell
Author: Shiro Imawaki
Author: Qigang Wu