The Gulf Stream Pathway and the Impacts of the Eddy-Driven Abyssal Circulation and the Deep Western Boundary Current
A hydrodynamic model of the subtropical Atlantic basin and the Intra-Americas Sea (9-47 deg N) is used to investigate the dynamics of Gulf Stream separation from the western boundary at Cape Hatteras and its mean pathway to the Grand Banks. The model has five isopycnal Lagrangian layers in the verti...
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ftdtic:ADA488977 2023-05-15T17:37:02+02:00 The Gulf Stream Pathway and the Impacts of the Eddy-Driven Abyssal Circulation and the Deep Western Boundary Current Hurlburt, Harley E. Hogan, Patrick J. NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV 2008-07-06 text/html http://www.dtic.mil/docs/citations/ADA488977 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA488977 en eng http://www.dtic.mil/docs/citations/ADA488977 Approved for public release; distribution is unlimited. DTIC Physical and Dynamic Oceanography *OCEAN CURRENTS TOPOGRAPHY BOUNDARIES BATHYMETRY CAPE HATTERAS SEPARATION OCEAN MODELS GULF STREAM HYDRODYNAMICS REPRINTS GEOMETRY MOC(MERIDIONAL OVERTURNING CIRCULATION ) DWBC(DEEP WESTERN BOUNDARY CURRENT) OCEANIC FRONTS WESTERN BOUNDARY CURRENTS ABYSSAL CIRCULATION BOTTOM TOPOGRAPHY EFFECTS WESTERN NORTH ATLANTIC OCEAN PE0601153N Text 2008 ftdtic 2016-02-22T17:19:24Z A hydrodynamic model of the subtropical Atlantic basin and the Intra-Americas Sea (9-47 deg N) is used to investigate the dynamics of Gulf Stream separation from the western boundary at Cape Hatteras and its mean pathway to the Grand Banks. The model has five isopycnal Lagrangian layers in the vertical and allows realistic boundary geometry, bathymetry, wind forcing, and a meridional overturning circulation (MOC), the latter specified via ports in the northern and southern boundaries. The northward upper ocean branch of the MOC (14 Sv) was always included but the southward Deep Western Boundary Current (DWBC) was excluded in some simulations, allowing investigation of the impacts of the DWBC and the eddy-driven mean abyssal circulation on Gulf Stream separation from the western boundary. The result is resolution dependent with the DWBC playing a crucial role in Gulf Stream separation at 1/16 deg resolution but with the eddy-driven abyssal circulation alone sufficient to obtain accurate separation at 1/32 deg resolution and a realistic pathway from Cape Hatteras to the Grand Banks with minimal DWBC impact except southeast of the Grand Banks. The separation from the western boundary is particularly sensitive to the strength of the eddy-driven abyssal circulation. Farther to the east, between 68 deg W and the Grand Banks, all of the 1/16 deg and 1/32 deg simulations with realistic topography (with or without a DWBC) gave similar generally realistic mean pathways with clear impacts of the topographically constrained eddy-driven abyssal circulation versus very unrealistic Gulf Stream pathways between Cape Hatteras and the Grand Banks from otherwise identical simulations run with a flat bottom, in reduced-gravity mode, or with 1/8 deg resolution and realistic topography. The original document contains color images. All DTIC reproductions will be in black and white. Pub. in Jnl. of Dynamics of Atmospheres and Oceans, v45 p71-101, 2008. Text North Atlantic Defense Technical Information Center: DTIC Technical Reports database |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
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ftdtic |
language |
English |
topic |
Physical and Dynamic Oceanography *OCEAN CURRENTS TOPOGRAPHY BOUNDARIES BATHYMETRY CAPE HATTERAS SEPARATION OCEAN MODELS GULF STREAM HYDRODYNAMICS REPRINTS GEOMETRY MOC(MERIDIONAL OVERTURNING CIRCULATION ) DWBC(DEEP WESTERN BOUNDARY CURRENT) OCEANIC FRONTS WESTERN BOUNDARY CURRENTS ABYSSAL CIRCULATION BOTTOM TOPOGRAPHY EFFECTS WESTERN NORTH ATLANTIC OCEAN PE0601153N |
spellingShingle |
Physical and Dynamic Oceanography *OCEAN CURRENTS TOPOGRAPHY BOUNDARIES BATHYMETRY CAPE HATTERAS SEPARATION OCEAN MODELS GULF STREAM HYDRODYNAMICS REPRINTS GEOMETRY MOC(MERIDIONAL OVERTURNING CIRCULATION ) DWBC(DEEP WESTERN BOUNDARY CURRENT) OCEANIC FRONTS WESTERN BOUNDARY CURRENTS ABYSSAL CIRCULATION BOTTOM TOPOGRAPHY EFFECTS WESTERN NORTH ATLANTIC OCEAN PE0601153N Hurlburt, Harley E. Hogan, Patrick J. The Gulf Stream Pathway and the Impacts of the Eddy-Driven Abyssal Circulation and the Deep Western Boundary Current |
topic_facet |
Physical and Dynamic Oceanography *OCEAN CURRENTS TOPOGRAPHY BOUNDARIES BATHYMETRY CAPE HATTERAS SEPARATION OCEAN MODELS GULF STREAM HYDRODYNAMICS REPRINTS GEOMETRY MOC(MERIDIONAL OVERTURNING CIRCULATION ) DWBC(DEEP WESTERN BOUNDARY CURRENT) OCEANIC FRONTS WESTERN BOUNDARY CURRENTS ABYSSAL CIRCULATION BOTTOM TOPOGRAPHY EFFECTS WESTERN NORTH ATLANTIC OCEAN PE0601153N |
description |
A hydrodynamic model of the subtropical Atlantic basin and the Intra-Americas Sea (9-47 deg N) is used to investigate the dynamics of Gulf Stream separation from the western boundary at Cape Hatteras and its mean pathway to the Grand Banks. The model has five isopycnal Lagrangian layers in the vertical and allows realistic boundary geometry, bathymetry, wind forcing, and a meridional overturning circulation (MOC), the latter specified via ports in the northern and southern boundaries. The northward upper ocean branch of the MOC (14 Sv) was always included but the southward Deep Western Boundary Current (DWBC) was excluded in some simulations, allowing investigation of the impacts of the DWBC and the eddy-driven mean abyssal circulation on Gulf Stream separation from the western boundary. The result is resolution dependent with the DWBC playing a crucial role in Gulf Stream separation at 1/16 deg resolution but with the eddy-driven abyssal circulation alone sufficient to obtain accurate separation at 1/32 deg resolution and a realistic pathway from Cape Hatteras to the Grand Banks with minimal DWBC impact except southeast of the Grand Banks. The separation from the western boundary is particularly sensitive to the strength of the eddy-driven abyssal circulation. Farther to the east, between 68 deg W and the Grand Banks, all of the 1/16 deg and 1/32 deg simulations with realistic topography (with or without a DWBC) gave similar generally realistic mean pathways with clear impacts of the topographically constrained eddy-driven abyssal circulation versus very unrealistic Gulf Stream pathways between Cape Hatteras and the Grand Banks from otherwise identical simulations run with a flat bottom, in reduced-gravity mode, or with 1/8 deg resolution and realistic topography. The original document contains color images. All DTIC reproductions will be in black and white. Pub. in Jnl. of Dynamics of Atmospheres and Oceans, v45 p71-101, 2008. |
author2 |
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV |
format |
Text |
author |
Hurlburt, Harley E. Hogan, Patrick J. |
author_facet |
Hurlburt, Harley E. Hogan, Patrick J. |
author_sort |
Hurlburt, Harley E. |
title |
The Gulf Stream Pathway and the Impacts of the Eddy-Driven Abyssal Circulation and the Deep Western Boundary Current |
title_short |
The Gulf Stream Pathway and the Impacts of the Eddy-Driven Abyssal Circulation and the Deep Western Boundary Current |
title_full |
The Gulf Stream Pathway and the Impacts of the Eddy-Driven Abyssal Circulation and the Deep Western Boundary Current |
title_fullStr |
The Gulf Stream Pathway and the Impacts of the Eddy-Driven Abyssal Circulation and the Deep Western Boundary Current |
title_full_unstemmed |
The Gulf Stream Pathway and the Impacts of the Eddy-Driven Abyssal Circulation and the Deep Western Boundary Current |
title_sort |
gulf stream pathway and the impacts of the eddy-driven abyssal circulation and the deep western boundary current |
publishDate |
2008 |
url |
http://www.dtic.mil/docs/citations/ADA488977 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA488977 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
DTIC |
op_relation |
http://www.dtic.mil/docs/citations/ADA488977 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766136753426530304 |