On the uncertainties and dynamics of Pacific interannual and decadal climate variability and climate change
Tropical and extratropical Pacific decadal climate variability substantially impact physical and biological systems in the Pacific Ocean and strongly influence global climate through teleconnection patterns. Current understanding of Pacific decadal climate variability centers around the El Niño-Sout...
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Georgia Institute of Technology
2010
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ftgeorgiatech:oai:smartech.gatech.edu:1853/37302 2023-05-15T13:15:08+02:00 On the uncertainties and dynamics of Pacific interannual and decadal climate variability and climate change Furtado, Jason C. Di Lorenzo, Emanuele Earth and Atmospheric Sciences Anderson, Bruce T. Black, Robert X. Cobb, Kim M. Webster, Peter J. 2010-11-11 application/pdf http://hdl.handle.net/1853/37302 unknown Georgia Institute of Technology http://hdl.handle.net/1853/37302 North Pacific Atmospheric circulation Coupled climate models IPCC North Pacific oscillation Tropical Pacific Climate change ENSO Climatology Climatic changes Tropospheric circulation Text Dissertation 2010 ftgeorgiatech 2023-02-13T18:45:59Z Tropical and extratropical Pacific decadal climate variability substantially impact physical and biological systems in the Pacific Ocean and strongly influence global climate through teleconnection patterns. Current understanding of Pacific decadal climate variability centers around the El Niño-Southern Oscillation (ENSO), the Aleutian Low (AL), and the Pacific Decadal Oscillation (PDO). However, recent literature has highlighted the emerging roles of secondary modes of variability of the tropical and extratropical Pacific atmosphere and ocean in global climate change: the Central Pacific Warming (CPW) phenomenon, the North Pacific Oscillation (NPO), and the North Pacific Gyre Oscillation (NPGO). This work analyzes the statistics and uncertainties behind Pacific interannual and decadal-scale climate variability, and focuses on better understanding the roles of the CPW, NPO, and NPGO in the climate system. The study begins by examining the dynamics of the NPO and its role in Pacific interannual and decadal climate variability. Results illustrate that the individual poles of the NPO have relations at high frequencies, but only the southern node contains a deterministic low-frequency component, which is forced by tropical Pacific sea surface temperature (SST) variability, as shown with a modeling experiment. The NPO-induced variability by the tropical Pacific SST is then integrated by the underlying ocean surface to form the decadal-scale NPGO signal. Thus, a new link between the CPW, the NPO, and the NPGO is formed, expanding the current framework of Pacific decadal variability and its implications for weather and climate. The new framework of North Pacific decadal variability (NPDV) is then evaluated in 24 state-of-the-art coupled climate models. Results indicate that the models in general have difficulty reproducing the leading modes of NPDV in space and time, particularly the NPGO mode and its connection to the NPO. Furthermore, most models lack the proper connections between extratropical and tropical Pacific, ... Doctoral or Postdoctoral Thesis aleutian low Georgia Institute of Technology: SMARTech - Scholarly Materials and Research at Georgia Tech Pacific |
institution |
Open Polar |
collection |
Georgia Institute of Technology: SMARTech - Scholarly Materials and Research at Georgia Tech |
op_collection_id |
ftgeorgiatech |
language |
unknown |
topic |
North Pacific Atmospheric circulation Coupled climate models IPCC North Pacific oscillation Tropical Pacific Climate change ENSO Climatology Climatic changes Tropospheric circulation |
spellingShingle |
North Pacific Atmospheric circulation Coupled climate models IPCC North Pacific oscillation Tropical Pacific Climate change ENSO Climatology Climatic changes Tropospheric circulation Furtado, Jason C. On the uncertainties and dynamics of Pacific interannual and decadal climate variability and climate change |
topic_facet |
North Pacific Atmospheric circulation Coupled climate models IPCC North Pacific oscillation Tropical Pacific Climate change ENSO Climatology Climatic changes Tropospheric circulation |
description |
Tropical and extratropical Pacific decadal climate variability substantially impact physical and biological systems in the Pacific Ocean and strongly influence global climate through teleconnection patterns. Current understanding of Pacific decadal climate variability centers around the El Niño-Southern Oscillation (ENSO), the Aleutian Low (AL), and the Pacific Decadal Oscillation (PDO). However, recent literature has highlighted the emerging roles of secondary modes of variability of the tropical and extratropical Pacific atmosphere and ocean in global climate change: the Central Pacific Warming (CPW) phenomenon, the North Pacific Oscillation (NPO), and the North Pacific Gyre Oscillation (NPGO). This work analyzes the statistics and uncertainties behind Pacific interannual and decadal-scale climate variability, and focuses on better understanding the roles of the CPW, NPO, and NPGO in the climate system. The study begins by examining the dynamics of the NPO and its role in Pacific interannual and decadal climate variability. Results illustrate that the individual poles of the NPO have relations at high frequencies, but only the southern node contains a deterministic low-frequency component, which is forced by tropical Pacific sea surface temperature (SST) variability, as shown with a modeling experiment. The NPO-induced variability by the tropical Pacific SST is then integrated by the underlying ocean surface to form the decadal-scale NPGO signal. Thus, a new link between the CPW, the NPO, and the NPGO is formed, expanding the current framework of Pacific decadal variability and its implications for weather and climate. The new framework of North Pacific decadal variability (NPDV) is then evaluated in 24 state-of-the-art coupled climate models. Results indicate that the models in general have difficulty reproducing the leading modes of NPDV in space and time, particularly the NPGO mode and its connection to the NPO. Furthermore, most models lack the proper connections between extratropical and tropical Pacific, ... |
author2 |
Di Lorenzo, Emanuele Earth and Atmospheric Sciences Anderson, Bruce T. Black, Robert X. Cobb, Kim M. Webster, Peter J. |
format |
Doctoral or Postdoctoral Thesis |
author |
Furtado, Jason C. |
author_facet |
Furtado, Jason C. |
author_sort |
Furtado, Jason C. |
title |
On the uncertainties and dynamics of Pacific interannual and decadal climate variability and climate change |
title_short |
On the uncertainties and dynamics of Pacific interannual and decadal climate variability and climate change |
title_full |
On the uncertainties and dynamics of Pacific interannual and decadal climate variability and climate change |
title_fullStr |
On the uncertainties and dynamics of Pacific interannual and decadal climate variability and climate change |
title_full_unstemmed |
On the uncertainties and dynamics of Pacific interannual and decadal climate variability and climate change |
title_sort |
on the uncertainties and dynamics of pacific interannual and decadal climate variability and climate change |
publisher |
Georgia Institute of Technology |
publishDate |
2010 |
url |
http://hdl.handle.net/1853/37302 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
aleutian low |
genre_facet |
aleutian low |
op_relation |
http://hdl.handle.net/1853/37302 |
_version_ |
1766267074790817792 |