Influence of the Atlantic Multidecadal Variability on the climate response to external forcing
Internal climate variability has been found to influence the climate response to an external forcing such as CO2. This thesis investigates the influence of the Atlantic Multidecadal Variability (AMV), a mode of internal climate variability in the North Atlantic Ocean, on the response to external for...
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University of Waterloo
2018
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ftunivwaterloo:oai:uwspace.uwaterloo.ca:10012/13675 2023-05-15T16:29:33+02:00 Influence of the Atlantic Multidecadal Variability on the climate response to external forcing Hyatt, Sarah 2018 http://hdl.handle.net/10012/13675 en eng University of Waterloo http://hdl.handle.net/10012/13675 Atlantic Multidecadal Variability Master Thesis 2018 ftunivwaterloo 2022-06-18T23:02:01Z Internal climate variability has been found to influence the climate response to an external forcing such as CO2. This thesis investigates the influence of the Atlantic Multidecadal Variability (AMV), a mode of internal climate variability in the North Atlantic Ocean, on the response to external forcing. The AMV is a 60 - 80 year fluctuation in the sea surface temperatures of the North Atlantic that has widespread effects on climate. Using simulations run on an ocean-atmosphere general circulation model (GCM), it is found that the AMV phase significantly impacts the regional response to CO2: in the extratropical Northern Hemisphere, Eurasia warms more, and North America and the North Pacific warm less, in the warm phase of the AMV. The mechanisms of the AMV-related response are explored using a constructed circulation analog method. Changes in teleconnections between the tropical and extratropical Pacific contribute to the dynamical component of the difference in response to forcing between AMV phases, while differences in sea ice may contribute to the thermodynamic component. Interestingly, some aspects of the AMV-related response are robust with different external forcings. Finally, using simulations run on an atmospheric GCM, the role of sea ice in forcing atmospheric AMV-related anomalies is investigated. It is found that sea ice in the Barents and Greenland Seas plays a large role in forcing local temperature anomalies. Master Thesis Greenland North Atlantic Sea ice University of Waterloo, Canada: Institutional Repository Greenland Pacific |
institution |
Open Polar |
collection |
University of Waterloo, Canada: Institutional Repository |
op_collection_id |
ftunivwaterloo |
language |
English |
topic |
Atlantic Multidecadal Variability |
spellingShingle |
Atlantic Multidecadal Variability Hyatt, Sarah Influence of the Atlantic Multidecadal Variability on the climate response to external forcing |
topic_facet |
Atlantic Multidecadal Variability |
description |
Internal climate variability has been found to influence the climate response to an external forcing such as CO2. This thesis investigates the influence of the Atlantic Multidecadal Variability (AMV), a mode of internal climate variability in the North Atlantic Ocean, on the response to external forcing. The AMV is a 60 - 80 year fluctuation in the sea surface temperatures of the North Atlantic that has widespread effects on climate. Using simulations run on an ocean-atmosphere general circulation model (GCM), it is found that the AMV phase significantly impacts the regional response to CO2: in the extratropical Northern Hemisphere, Eurasia warms more, and North America and the North Pacific warm less, in the warm phase of the AMV. The mechanisms of the AMV-related response are explored using a constructed circulation analog method. Changes in teleconnections between the tropical and extratropical Pacific contribute to the dynamical component of the difference in response to forcing between AMV phases, while differences in sea ice may contribute to the thermodynamic component. Interestingly, some aspects of the AMV-related response are robust with different external forcings. Finally, using simulations run on an atmospheric GCM, the role of sea ice in forcing atmospheric AMV-related anomalies is investigated. It is found that sea ice in the Barents and Greenland Seas plays a large role in forcing local temperature anomalies. |
format |
Master Thesis |
author |
Hyatt, Sarah |
author_facet |
Hyatt, Sarah |
author_sort |
Hyatt, Sarah |
title |
Influence of the Atlantic Multidecadal Variability on the climate response to external forcing |
title_short |
Influence of the Atlantic Multidecadal Variability on the climate response to external forcing |
title_full |
Influence of the Atlantic Multidecadal Variability on the climate response to external forcing |
title_fullStr |
Influence of the Atlantic Multidecadal Variability on the climate response to external forcing |
title_full_unstemmed |
Influence of the Atlantic Multidecadal Variability on the climate response to external forcing |
title_sort |
influence of the atlantic multidecadal variability on the climate response to external forcing |
publisher |
University of Waterloo |
publishDate |
2018 |
url |
http://hdl.handle.net/10012/13675 |
geographic |
Greenland Pacific |
geographic_facet |
Greenland Pacific |
genre |
Greenland North Atlantic Sea ice |
genre_facet |
Greenland North Atlantic Sea ice |
op_relation |
http://hdl.handle.net/10012/13675 |
_version_ |
1766019259904819200 |