Projected changes to South Atlantic boundary currents and confluence region in the CMIP5 models: the role of wind and deep ocean changes
The South Atlantic (SA) circulation plays an important role in the oceanic teleconnections from the Indian, Pacific and Southern oceans to the North Atlantic, with inter-hemispheric exchanges of heat and salt. Here, we show that the large-scale features of the SA circulation are projected to change...
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ftdoajarticles:oai:doaj.org/article:624a7fcec6954b70846688a4b9bf37df 2023-09-05T13:21:15+02:00 Projected changes to South Atlantic boundary currents and confluence region in the CMIP5 models: the role of wind and deep ocean changes G M Pontes A Sen Gupta A S Taschetto 2016-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/11/9/094013 https://doaj.org/article/624a7fcec6954b70846688a4b9bf37df EN eng IOP Publishing https://doi.org/10.1088/1748-9326/11/9/094013 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/11/9/094013 1748-9326 https://doaj.org/article/624a7fcec6954b70846688a4b9bf37df Environmental Research Letters, Vol 11, Iss 9, p 094013 (2016) South Atlantic ocean climate change Climate Model Intercomparisson Project-CMIP Sverdrup’s dynamics Brazil current Brazil–Malvinas confluence Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2016 ftdoajarticles https://doi.org/10.1088/1748-9326/11/9/094013 2023-08-13T00:37:47Z The South Atlantic (SA) circulation plays an important role in the oceanic teleconnections from the Indian, Pacific and Southern oceans to the North Atlantic, with inter-hemispheric exchanges of heat and salt. Here, we show that the large-scale features of the SA circulation are projected to change significantly under ‘business as usual’ greenhouse gas increases. Based on 19 models from the Coupled Model Intercomparison Project phase 5 there is a projected weakening in the upper ocean interior transport (<1000 m) between 15° and ∼32°S, largely related to a weakening of the wind stress curl over this region. The reduction in ocean interior circulation is largely compensated by a decrease in the net deep southward ocean transport (>1000 m), mainly related to a decrease in the North Atlantic deep water transport. Between 30° and 40°S, there is a consistent projected intensification in the Brazil current strength of about 40% (30%–58% interquartile range) primarily compensated by an intensification of the upper interior circulation across the Indo-Atlantic basin. The Brazil–Malvinas confluence is projected to shift southwards, driven by a weakening of the Malvinas current. Such a change could have important implications for the distribution of marine species in the southwestern SA in the future. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic South Atlantic Ocean Directory of Open Access Journals: DOAJ Articles Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Indian Pacific Environmental Research Letters 11 9 094013 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
South Atlantic ocean climate change Climate Model Intercomparisson Project-CMIP Sverdrup’s dynamics Brazil current Brazil–Malvinas confluence Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
South Atlantic ocean climate change Climate Model Intercomparisson Project-CMIP Sverdrup’s dynamics Brazil current Brazil–Malvinas confluence Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 G M Pontes A Sen Gupta A S Taschetto Projected changes to South Atlantic boundary currents and confluence region in the CMIP5 models: the role of wind and deep ocean changes |
topic_facet |
South Atlantic ocean climate change Climate Model Intercomparisson Project-CMIP Sverdrup’s dynamics Brazil current Brazil–Malvinas confluence Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
The South Atlantic (SA) circulation plays an important role in the oceanic teleconnections from the Indian, Pacific and Southern oceans to the North Atlantic, with inter-hemispheric exchanges of heat and salt. Here, we show that the large-scale features of the SA circulation are projected to change significantly under ‘business as usual’ greenhouse gas increases. Based on 19 models from the Coupled Model Intercomparison Project phase 5 there is a projected weakening in the upper ocean interior transport (<1000 m) between 15° and ∼32°S, largely related to a weakening of the wind stress curl over this region. The reduction in ocean interior circulation is largely compensated by a decrease in the net deep southward ocean transport (>1000 m), mainly related to a decrease in the North Atlantic deep water transport. Between 30° and 40°S, there is a consistent projected intensification in the Brazil current strength of about 40% (30%–58% interquartile range) primarily compensated by an intensification of the upper interior circulation across the Indo-Atlantic basin. The Brazil–Malvinas confluence is projected to shift southwards, driven by a weakening of the Malvinas current. Such a change could have important implications for the distribution of marine species in the southwestern SA in the future. |
format |
Article in Journal/Newspaper |
author |
G M Pontes A Sen Gupta A S Taschetto |
author_facet |
G M Pontes A Sen Gupta A S Taschetto |
author_sort |
G M Pontes |
title |
Projected changes to South Atlantic boundary currents and confluence region in the CMIP5 models: the role of wind and deep ocean changes |
title_short |
Projected changes to South Atlantic boundary currents and confluence region in the CMIP5 models: the role of wind and deep ocean changes |
title_full |
Projected changes to South Atlantic boundary currents and confluence region in the CMIP5 models: the role of wind and deep ocean changes |
title_fullStr |
Projected changes to South Atlantic boundary currents and confluence region in the CMIP5 models: the role of wind and deep ocean changes |
title_full_unstemmed |
Projected changes to South Atlantic boundary currents and confluence region in the CMIP5 models: the role of wind and deep ocean changes |
title_sort |
projected changes to south atlantic boundary currents and confluence region in the cmip5 models: the role of wind and deep ocean changes |
publisher |
IOP Publishing |
publishDate |
2016 |
url |
https://doi.org/10.1088/1748-9326/11/9/094013 https://doaj.org/article/624a7fcec6954b70846688a4b9bf37df |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Curl Indian Pacific |
geographic_facet |
Curl Indian Pacific |
genre |
North Atlantic Deep Water North Atlantic South Atlantic Ocean |
genre_facet |
North Atlantic Deep Water North Atlantic South Atlantic Ocean |
op_source |
Environmental Research Letters, Vol 11, Iss 9, p 094013 (2016) |
op_relation |
https://doi.org/10.1088/1748-9326/11/9/094013 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/11/9/094013 1748-9326 https://doaj.org/article/624a7fcec6954b70846688a4b9bf37df |
op_doi |
https://doi.org/10.1088/1748-9326/11/9/094013 |
container_title |
Environmental Research Letters |
container_volume |
11 |
container_issue |
9 |
container_start_page |
094013 |
_version_ |
1776201854002135040 |