South Pacific decadal climate variability and potential predictability
The South Pacific decadal oscillation (SPDO) characterizes the Southern Hemisphere contribution to the Pacific-wide interdecadal Pacific oscillation (IPO) and is analogous to the Pacific decadal oscillation (PDO) centered in the North Pacific. In this study, upper ocean variability and potential pre...
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ftunivtasmania:oai:eprints.utas.edu.au:32367 2023-05-15T13:15:03+02:00 South Pacific decadal climate variability and potential predictability Lou, J Holbrook, NJ O'Kane, TJ 2019 application/pdf https://eprints.utas.edu.au/32367/ https://eprints.utas.edu.au/32367/1/136697%20-%20South%20Pacific%20decadal%20climate%20variability%20and%20potential%20predictability.pdf en eng Amer Meteorological Soc https://eprints.utas.edu.au/32367/1/136697%20-%20South%20Pacific%20decadal%20climate%20variability%20and%20potential%20predictability.pdf Lou, J orcid:0000-0002-4014-5242 , Holbrook, NJ orcid:0000-0002-3523-6254 and O'Kane, TJ 2019 , 'South Pacific decadal climate variability and potential predictability' , Journal of Climate, vol. 32, no. 18 , pp. 6051-6069 , doi:10.1175/JCLI-D-18-0249.1 <http://dx.doi.org/10.1175/JCLI-D-18-0249.1>. South Pacific decadal oscillation (SPDO) Southern Hemisphere Pacific interdecadal Pacific oscillation (IPO) Pacific decadal oscillation (PDO) North Pacific Article PeerReviewed 2019 ftunivtasmania https://doi.org/10.1175/JCLI-D-18-0249.1 2022-01-10T23:16:42Z The South Pacific decadal oscillation (SPDO) characterizes the Southern Hemisphere contribution to the Pacific-wide interdecadal Pacific oscillation (IPO) and is analogous to the Pacific decadal oscillation (PDO) centered in the North Pacific. In this study, upper ocean variability and potential predictability of the SPDO is examined in HadISST data and an atmosphere-forced ocean general circulation model. The potential predictability of the IPO-related variability is investigated in terms of both the fractional contribution made by the decadal component in the South, tropical and North Pacific Oceans and in terms of a doubly integrated first-order autoregressive (AR1) model. Despite explaining a smaller fraction of the total variance, we find larger potential predictability of the SPDO relative to the PDO. We identify distinct local drivers in the western subtropical South Pacific, where nonlinear baroclinic Rossby wave–topographic interactions act to low-pass filter decadal variability. In particular, we show that the Kermadec Ridge in the southwest Pacific enhances the decadal signature more prominently than anywhere else in the Pacific basin. Applying the doubly integrated AR1 model, we demonstrate that variability associated with the Pacific–South American pattern is a critically important atmospheric driver of the SPDO via a reddening process analogous to the relationship between the Aleutian low and PDO in the North Pacific—albeit that the relationship in the South Pacific appears to be even stronger. Our results point to the largely unrecognized importance of South Pacific processes as a key source of decadal variability and predictability. Article in Journal/Newspaper aleutian low University of Tasmania: UTas ePrints Pacific Journal of Climate 32 18 6051 6069 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
South Pacific decadal oscillation (SPDO) Southern Hemisphere Pacific interdecadal Pacific oscillation (IPO) Pacific decadal oscillation (PDO) North Pacific |
spellingShingle |
South Pacific decadal oscillation (SPDO) Southern Hemisphere Pacific interdecadal Pacific oscillation (IPO) Pacific decadal oscillation (PDO) North Pacific Lou, J Holbrook, NJ O'Kane, TJ South Pacific decadal climate variability and potential predictability |
topic_facet |
South Pacific decadal oscillation (SPDO) Southern Hemisphere Pacific interdecadal Pacific oscillation (IPO) Pacific decadal oscillation (PDO) North Pacific |
description |
The South Pacific decadal oscillation (SPDO) characterizes the Southern Hemisphere contribution to the Pacific-wide interdecadal Pacific oscillation (IPO) and is analogous to the Pacific decadal oscillation (PDO) centered in the North Pacific. In this study, upper ocean variability and potential predictability of the SPDO is examined in HadISST data and an atmosphere-forced ocean general circulation model. The potential predictability of the IPO-related variability is investigated in terms of both the fractional contribution made by the decadal component in the South, tropical and North Pacific Oceans and in terms of a doubly integrated first-order autoregressive (AR1) model. Despite explaining a smaller fraction of the total variance, we find larger potential predictability of the SPDO relative to the PDO. We identify distinct local drivers in the western subtropical South Pacific, where nonlinear baroclinic Rossby wave–topographic interactions act to low-pass filter decadal variability. In particular, we show that the Kermadec Ridge in the southwest Pacific enhances the decadal signature more prominently than anywhere else in the Pacific basin. Applying the doubly integrated AR1 model, we demonstrate that variability associated with the Pacific–South American pattern is a critically important atmospheric driver of the SPDO via a reddening process analogous to the relationship between the Aleutian low and PDO in the North Pacific—albeit that the relationship in the South Pacific appears to be even stronger. Our results point to the largely unrecognized importance of South Pacific processes as a key source of decadal variability and predictability. |
format |
Article in Journal/Newspaper |
author |
Lou, J Holbrook, NJ O'Kane, TJ |
author_facet |
Lou, J Holbrook, NJ O'Kane, TJ |
author_sort |
Lou, J |
title |
South Pacific decadal climate variability and potential predictability |
title_short |
South Pacific decadal climate variability and potential predictability |
title_full |
South Pacific decadal climate variability and potential predictability |
title_fullStr |
South Pacific decadal climate variability and potential predictability |
title_full_unstemmed |
South Pacific decadal climate variability and potential predictability |
title_sort |
south pacific decadal climate variability and potential predictability |
publisher |
Amer Meteorological Soc |
publishDate |
2019 |
url |
https://eprints.utas.edu.au/32367/ https://eprints.utas.edu.au/32367/1/136697%20-%20South%20Pacific%20decadal%20climate%20variability%20and%20potential%20predictability.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
aleutian low |
genre_facet |
aleutian low |
op_relation |
https://eprints.utas.edu.au/32367/1/136697%20-%20South%20Pacific%20decadal%20climate%20variability%20and%20potential%20predictability.pdf Lou, J orcid:0000-0002-4014-5242 , Holbrook, NJ orcid:0000-0002-3523-6254 and O'Kane, TJ 2019 , 'South Pacific decadal climate variability and potential predictability' , Journal of Climate, vol. 32, no. 18 , pp. 6051-6069 , doi:10.1175/JCLI-D-18-0249.1 <http://dx.doi.org/10.1175/JCLI-D-18-0249.1>. |
op_doi |
https://doi.org/10.1175/JCLI-D-18-0249.1 |
container_title |
Journal of Climate |
container_volume |
32 |
container_issue |
18 |
container_start_page |
6051 |
op_container_end_page |
6069 |
_version_ |
1766266708188725248 |