Studies of the ocean-atmosphere system using a coupled climate model
An idealized atmospheric model consisting of energy and moisture conservation equations is developed for studies of the ocean's role in climate. Testing under fixed oceanic conditions yields a climatology comparable with direct observations, as does the case when the interpentadal (1955–59; 197...
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ftuvicpubl:oai:dspace.library.uvic.ca:1828/9853 2023-05-15T17:13:51+02:00 Studies of the ocean-atmosphere system using a coupled climate model Fanning, Augustus Francis Weaver, Andrew J. 1997 application/pdf https://dspace.library.uvic.ca//handle/1828/9853 English en eng https://dspace.library.uvic.ca//handle/1828/9853 Available to the World Wide Web Ocean-atmosphere interaction Ocean circulation Atmospheric circulation Thesis 1997 ftuvicpubl 2022-05-19T06:14:31Z An idealized atmospheric model consisting of energy and moisture conservation equations is developed for studies of the ocean's role in climate. Testing under fixed oceanic conditions yields a climatology comparable with direct observations, as does the case when the interpentadal (1955–59; 1970–74) sea surface temperature fields are applied. The atmospheric model is then coupled to an ocean general circulation model as well as a thermodynamic ice model without the use of flux adjustments. When configured for a global realistic geometry, the model faithfully represents deep water formation in the Atlantic and Southern Oceans with upwelling throughout the Pacific and Indian Oceans. The model is then utilized to investigate the influence of meltwater discharge on the stability of North Atlantic Deep Water (NADW) production and the Younger Dryas (YD ∼ 14ka). Results suggest pre-YD meltwater is capable of diminishing NADW to the point where diversion of meltwater from the Gulf of Mexico to the St. Lawrence completely inhibits its production. The coupled model appears to be stable in this state, equivalent to the “Southern Sinking” equilibrium identified in previous models. Inclusion of the wind stress/speed feedback, however, has a dramatic effect causing a reestablishment of NADW production. The model is then configured in a four basin-two hemisphere sector geometry, crudely representative of the global oceans. Two identically formulated models (one of which employs flux adjustments) are then perturbed to assess the role of flux adjustments on the ocean's response to a “global warming-like” scenario. Significant global and basin-scale differences exist between the cases which is linked to the influence of the salt-flux adjustment on the overturning cells within the model Atlantic and Southern Oceans. Results further suggest that minimizing the coupling shock prior to applying the perturbation leads to results slightly closer between the models, although large differences still persist. The model is then configured ... Thesis NADW North Atlantic Deep Water North Atlantic University of Victoria (Canada): UVicDSpace Indian Pacific |
institution |
Open Polar |
collection |
University of Victoria (Canada): UVicDSpace |
op_collection_id |
ftuvicpubl |
language |
English |
topic |
Ocean-atmosphere interaction Ocean circulation Atmospheric circulation |
spellingShingle |
Ocean-atmosphere interaction Ocean circulation Atmospheric circulation Fanning, Augustus Francis Studies of the ocean-atmosphere system using a coupled climate model |
topic_facet |
Ocean-atmosphere interaction Ocean circulation Atmospheric circulation |
description |
An idealized atmospheric model consisting of energy and moisture conservation equations is developed for studies of the ocean's role in climate. Testing under fixed oceanic conditions yields a climatology comparable with direct observations, as does the case when the interpentadal (1955–59; 1970–74) sea surface temperature fields are applied. The atmospheric model is then coupled to an ocean general circulation model as well as a thermodynamic ice model without the use of flux adjustments. When configured for a global realistic geometry, the model faithfully represents deep water formation in the Atlantic and Southern Oceans with upwelling throughout the Pacific and Indian Oceans. The model is then utilized to investigate the influence of meltwater discharge on the stability of North Atlantic Deep Water (NADW) production and the Younger Dryas (YD ∼ 14ka). Results suggest pre-YD meltwater is capable of diminishing NADW to the point where diversion of meltwater from the Gulf of Mexico to the St. Lawrence completely inhibits its production. The coupled model appears to be stable in this state, equivalent to the “Southern Sinking” equilibrium identified in previous models. Inclusion of the wind stress/speed feedback, however, has a dramatic effect causing a reestablishment of NADW production. The model is then configured in a four basin-two hemisphere sector geometry, crudely representative of the global oceans. Two identically formulated models (one of which employs flux adjustments) are then perturbed to assess the role of flux adjustments on the ocean's response to a “global warming-like” scenario. Significant global and basin-scale differences exist between the cases which is linked to the influence of the salt-flux adjustment on the overturning cells within the model Atlantic and Southern Oceans. Results further suggest that minimizing the coupling shock prior to applying the perturbation leads to results slightly closer between the models, although large differences still persist. The model is then configured ... |
author2 |
Weaver, Andrew J. |
format |
Thesis |
author |
Fanning, Augustus Francis |
author_facet |
Fanning, Augustus Francis |
author_sort |
Fanning, Augustus Francis |
title |
Studies of the ocean-atmosphere system using a coupled climate model |
title_short |
Studies of the ocean-atmosphere system using a coupled climate model |
title_full |
Studies of the ocean-atmosphere system using a coupled climate model |
title_fullStr |
Studies of the ocean-atmosphere system using a coupled climate model |
title_full_unstemmed |
Studies of the ocean-atmosphere system using a coupled climate model |
title_sort |
studies of the ocean-atmosphere system using a coupled climate model |
publishDate |
1997 |
url |
https://dspace.library.uvic.ca//handle/1828/9853 |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_relation |
https://dspace.library.uvic.ca//handle/1828/9853 |
op_rights |
Available to the World Wide Web |
_version_ |
1766071036849160192 |