two-way teleconnections between the Southern Ocean and the Tropical Pacific via a dynamic feedback
Despite substantial global mean warming, surface cooling has occurred in both the tropical eastern Pacific Ocean and the Southern Ocean over the past 40 years, influencing both regional climates and estimates of Earth's climate sensitivity to rising greenhouse gases. While a tropical influence...
Published in: | Journal of Climate |
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Language: | English |
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2022
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Online Access: | https://doi.org/10.1175/JCLI-D-22-0080.1 |
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ftncar:oai:drupal-site.org:articles_25947 2023-05-15T18:23:42+02:00 two-way teleconnections between the Southern Ocean and the Tropical Pacific via a dynamic feedback Dong, Yue (author) Armour, Kyle C. (author) Battisti, David S. (author) Blanchard-Wrigglesworth, Edward (author) 2022-10-01 https://doi.org/10.1175/JCLI-D-22-0080.1 en eng Journal of Climate--0894-8755--1520-0442 articles:25947 doi:10.1175/JCLI-D-22-0080.1 ark:/85065/d7445rcp Copyright 2022 American Meteorological Society (AMS). article Text 2022 ftncar https://doi.org/10.1175/JCLI-D-22-0080.1 2023-03-27T18:07:01Z Despite substantial global mean warming, surface cooling has occurred in both the tropical eastern Pacific Ocean and the Southern Ocean over the past 40 years, influencing both regional climates and estimates of Earth's climate sensitivity to rising greenhouse gases. While a tropical influence on the extratropics has been extensively studied in the literature, here we demonstrate that the teleconnection works in the other direction as well, with the southeast Pacific sector of the Southern Ocean exerting a strong influence on the tropical eastern Pacific. Using a slab ocean model, we find that the tropical Pacific sea surface temperature (SST) response to an imposed Southern Ocean surface heat flux forcing is sensitive to the longitudinal location of that forcing, suggesting an atmospheric pathway associated with regional dynamics rather than reflecting a zonal-mean energetic constraint. The transient response shows that an imposed Southern Ocean cooling in the southeast Pacific sector first propagates into the tropics by mean-wind advection. Once tropical Pacific SSTs are perturbed, they then drive remote changes to atmospheric circulation in the extratropics that further enhance both Southern Ocean and tropical cooling. These results suggest a mutually interactive two-way teleconnection between the Southern Ocean and tropical Pacific through atmospheric circulations, and highlight potential impacts on the tropics from the extratropical climate changes over the instrumental record and in the future. Article in Journal/Newspaper Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Pacific Southern Ocean Journal of Climate 35 19 2667 2682 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Despite substantial global mean warming, surface cooling has occurred in both the tropical eastern Pacific Ocean and the Southern Ocean over the past 40 years, influencing both regional climates and estimates of Earth's climate sensitivity to rising greenhouse gases. While a tropical influence on the extratropics has been extensively studied in the literature, here we demonstrate that the teleconnection works in the other direction as well, with the southeast Pacific sector of the Southern Ocean exerting a strong influence on the tropical eastern Pacific. Using a slab ocean model, we find that the tropical Pacific sea surface temperature (SST) response to an imposed Southern Ocean surface heat flux forcing is sensitive to the longitudinal location of that forcing, suggesting an atmospheric pathway associated with regional dynamics rather than reflecting a zonal-mean energetic constraint. The transient response shows that an imposed Southern Ocean cooling in the southeast Pacific sector first propagates into the tropics by mean-wind advection. Once tropical Pacific SSTs are perturbed, they then drive remote changes to atmospheric circulation in the extratropics that further enhance both Southern Ocean and tropical cooling. These results suggest a mutually interactive two-way teleconnection between the Southern Ocean and tropical Pacific through atmospheric circulations, and highlight potential impacts on the tropics from the extratropical climate changes over the instrumental record and in the future. |
author2 |
Dong, Yue (author) Armour, Kyle C. (author) Battisti, David S. (author) Blanchard-Wrigglesworth, Edward (author) |
format |
Article in Journal/Newspaper |
title |
two-way teleconnections between the Southern Ocean and the Tropical Pacific via a dynamic feedback |
spellingShingle |
two-way teleconnections between the Southern Ocean and the Tropical Pacific via a dynamic feedback |
title_short |
two-way teleconnections between the Southern Ocean and the Tropical Pacific via a dynamic feedback |
title_full |
two-way teleconnections between the Southern Ocean and the Tropical Pacific via a dynamic feedback |
title_fullStr |
two-way teleconnections between the Southern Ocean and the Tropical Pacific via a dynamic feedback |
title_full_unstemmed |
two-way teleconnections between the Southern Ocean and the Tropical Pacific via a dynamic feedback |
title_sort |
two-way teleconnections between the southern ocean and the tropical pacific via a dynamic feedback |
publishDate |
2022 |
url |
https://doi.org/10.1175/JCLI-D-22-0080.1 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Journal of Climate--0894-8755--1520-0442 articles:25947 doi:10.1175/JCLI-D-22-0080.1 ark:/85065/d7445rcp |
op_rights |
Copyright 2022 American Meteorological Society (AMS). |
op_doi |
https://doi.org/10.1175/JCLI-D-22-0080.1 |
container_title |
Journal of Climate |
container_volume |
35 |
container_issue |
19 |
container_start_page |
2667 |
op_container_end_page |
2682 |
_version_ |
1766203774153523200 |