A Wind-forced Modeling Study of the Canary Current System from 30° N to 42.5° N PDF Download
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Author: Daniel W. Bryan
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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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 W. Bryan
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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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
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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: Eric J. Buch
Publisher:
ISBN: 9781423569015
Category :
Languages : en
Pages : 123
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Book Description
A high-resolution, multi-level, primitive equation ocean model is used to examine the response of an eastern boundary oceanic regime to both wind forcing and irregular coastline geometry. The focus of this study is the coastal region from 300 N to 42.50 N, a portion of the Canary Current System (CCS). To study the generation, evolution, and sustainment of the currents, meanders, eddies and filaments of the CCS, the model is forced from rest using seasonal climatological winds. To investigate - the role of irregular coastline geometry, the first experiment uses climatological wind forcing along an idealized "straightened" coastline, while the second experiment uses the same wind forcing along an irregular coastline. In both cases a surface current, undercurrent, meanders, eddies, and filaments are generated. The results obtained while using the irregular, rather than the idealized coastline, however, show preferred eddy generation locations as well as enhanced growth of meanders, eddies, and filaments. The features produced by the model are consistent with available observations of the CCS. The model results support the hypothesis that both wind forcing and irregular coastline geometry are important mechanisms in the generation of many of the observed features of the CCS.
Author: Ross P. Mitchell
Publisher:
ISBN:
Category : California Current
Languages : en
Pages : 136
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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: James R. Vann
Publisher:
ISBN:
Category : Ocean currents
Languages : en
Pages : 0
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Book Description
A high-resolution multi-level, primitive equation ocean model is used to examine the response of an idealized, flat-bottom, eastern boundary oceanic regime on a beta-plane to climatological average (1980-1989), individual year, and multiple year wind forcing. The focus of this study is the California Current System along the coastal region, from 35 deg N to 47.5 deg N, off the West Coast of North America. Two types of experiments are conducted. The first type forces the model from rest with climatological, 1981, and 1983 monthly winds to examine the generation phase of features such as currents, upwelling, meanders, eddies, and filaments. The second type continues the forcing from the previous years to examine the maintenance of these features. In the first type of experiments, the following features are observed: a poleward coastal surface current near the start and end of each year, and equatorward surface current, a poleward undercurrent, upwelling, meanders, and eddies. In the second type of experiments, meanders and eddies were already present at the start of the experiment. In addition to the features observed during the first type of experiment, filaments are generated. The results support the hypothesis that wind forcing is an important mechanism for the generation of many of the observed features in the California Current System.
Author: James R. Vann
Publisher:
ISBN:
Category : Ocean currents
Languages : en
Pages : 212
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Book Description
A high-resolution multi-level, primitive equation ocean model is used to examine the response of an idealized, flat-bottom, eastern boundary oceanic regime on a beta-plane to climatological average (1980-1989), individual year, and multiple year wind forcing. The focus of this study is the California Current System along the coastal region, from 35 deg N to 47.5 deg N, off the West Coast of North America. Two types of experiments are conducted. The first type forces the model from rest with climatological, 1981, and 1983 monthly winds to examine the generation phase of features such as currents, upwelling, meanders, eddies, and filaments. The second type continues the forcing from the previous years to examine the maintenance of these features. In the first type of experiments, the following features are observed: a poleward coastal surface current near the start and end of each year, and equatorward surface current, a poleward undercurrent, upwelling, meanders, and eddies. In the second type of experiments, meanders and eddies were already present at the start of the experiment. In addition to the features observed during the first type of experiment, filaments are generated. The results support the hypothesis that wind forcing is an important mechanism for the generation of many of the observed features in the California Current System.
Author: Carlos N. Lopes Da Costa
Publisher:
ISBN:
Category : Ocean currents
Languages : en
Pages : 128
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Book Description
A high resolution, multi-level, primitive equation ocean model is used to examine the response to wind forcing of an idealized, flat-bottomed oceanic regime on a beta-plane, along the eastern ocean boundary off the west coast of the Iberian Peninsula. Three experiments are conducted to investigate the role of different types of prescribed wind forcing. In experiment 1, a band equatorward winds which are uniform alongshore but contain zonal variability (i.e., large negative wind stress curl near the coast), results in an equatorward coastal surface current nearshore and a poleward surface current offshore. With time, the currents become unstable and anticyclonic warm core eddies develop in the region of negative wind stress curl. In experiment 2, the model is forced with poleward wind stress for 20 days followed by a sudden change to equatorward wind stress. A 1-2 day transition from downwelling and a poleward surface current near the coast to upwelling and an equatorward surface jet occurs. With the time the upwelled isotherms are displaced offshore, the equatorward surface jet widens and gets shallower nearshore, and the poleward undercurrent moves closer to the surface (depth approx. = 120 m at the coast). For experiment 3, a time series of 6-hourly values of the north/south component of the wind, computed from Fleet Numerical Oceanography Center synoptic surface pressure analyses are used to investigate the response of the coastal current system to time dependent wind forcing. Keywords: Theses. (kr).
Author: Philip W. Vance
Publisher:
ISBN: 9781423569930
Category :
Languages : en
Pages : 89
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Book Description
A high-resolution, multi-level, primitive equation model is initialized with climatological data to study the combined effects of wind and thermohaline forcing on the ocean circulation of the California Current System (CCS). The ocean circulation is generated by the model using a combination of climatological wind stress and thermohaline forcing. In the first experiment, the effects of thermohaline forcing alone are evaluated, in the second experiment, previously conducted, the effects of wind forcing are isolated, while in the third experiment, the combined effects of wind and thermohaline forcing are looked at. The results from the combined experiment show that even though the effects of wind forcing dominate the CCS, the additional effects of the thermohaline forcing results in the following: the seasonal development of a poleward surface current and an equatorward undercurrent in the poleward end of the model region; an onshore geostrophic component, which results in a temperature front and stronger surface and subsurface currents between Cape Mendocino and Point Arena; and a region of maximum eddy kinetic energy inshore of tilde 125 deg W between Cape Mendocino and Point Arena, associated with the temperature front. These model simulations are qualitatively similar to recent hydrographic, altimetric, drifter, and moored observations of the CCS.
Author: Johnny R. Martinez
Publisher:
ISBN: 9781423545507
Category :
Languages : en
Pages : 98
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Book Description
To investigate the Northern Canary Current System (NCCS), results from four numerical experiments of increasing complexity are examined. Experiment I, which uses seasonal wind forcing only, shows that, as expected, wind forcing is the key generative mechanism for the current, upwelling, meander, eddy, and filament structures. Experiments 2 and 3 have the addition of an irregular coastline. These two experiments show that capes are areas for enhanced upwelling, extensive filaments, maximum current velocities, and enhanced growth of cyclonic meanders and eddies. Also, an embayment like the Gulf of Cadiz is a primary region for anticyclonic meander and eddy development. A fourth experiment has the additional effects of thermohaline gradients and Mediterranean Outflow. This complex regime has features similar to NCCS observations, including the generation of Meddies.
Author: Robert T. Haines
Publisher:
ISBN:
Category : Ocean currents
Languages : en
Pages : 124
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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 climatological average (1980-1989) and individual yearly (1980-1983) wind forcing. The focus of this study is the California Current System (CCS) along the coastal region, from 35 deg N to 47.5 deg N, of the Western United States. Five experiments were initialized from a state of rest and two from the fields remaining at day 360 from the climatological average wind forcing. With the climatological average wind forcing, a surface equatorward jet and poleward undercurrent are generated. Eddies form along the entire eastern boundary and a field of cyclonic eddies approximately 200 km in diameter remain at day 360. Results for the non-El Nino (1980-1981) years are very similar to the results for the climatological average wind forcing. Early in the year, the El Nino wind fields for 1983 are more intense than the average and 1980-1982 winds, and they have a much stronger poleward component. A surface poleward current develops over an equatorward undercurrent.
