Analogous seasonal evolution of the South Atlantic SST dipole indices
Abstract Two variants of sea‐surface temperature (SST) dipole indices for the South Atlantic Ocean (SAO) has been previously described representing: (1) the South Atlantic subtropical dipole (SASD) supposedly peaking in austral summer and (2) the SAO dipole (SAOD) in winter. In this study, we presen...
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crwiley:10.1002/asl.781 2024-09-15T18:36:25+00:00 Analogous seasonal evolution of the South Atlantic SST dipole indices Nnamchi, Hyacinth C. Kucharski, Fred Keenlyside, Noel S. Farneti, Riccardo Norges Forskningsråd 2017 http://dx.doi.org/10.1002/asl.781 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fasl.781 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/asl.781 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Atmospheric Science Letters volume 18, issue 10, page 396-402 ISSN 1530-261X 1530-261X journal-article 2017 crwiley https://doi.org/10.1002/asl.781 2024-07-09T04:13:17Z Abstract Two variants of sea‐surface temperature (SST) dipole indices for the South Atlantic Ocean (SAO) has been previously described representing: (1) the South Atlantic subtropical dipole (SASD) supposedly peaking in austral summer and (2) the SAO dipole (SAOD) in winter. In this study, we present the analysis of observational data sets (1985–2014) showing the SASD and SAOD as largely constituting the same mode of ocean–atmosphere interaction reminiscent of the SAOD structure peaking in winter. Indeed, winter is the only season in which the inverse correlation between the northern and southern poles of both indices is statistically significant. The observed SASD and SAOD indices exhibit robust correlations ( P ≤ 0.001) in all seasons and these are reproduced by 54 of the 63 different models of the Coupled Models Intercomparison Project analysed. Their robust correlations notwithstanding the SASD and SAOD indices appear to better capture different aspects of SAO climate variability and teleconnections. Article in Journal/Newspaper South Atlantic Ocean Wiley Online Library Atmospheric Science Letters 18 10 396 402 |
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Open Polar |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract Two variants of sea‐surface temperature (SST) dipole indices for the South Atlantic Ocean (SAO) has been previously described representing: (1) the South Atlantic subtropical dipole (SASD) supposedly peaking in austral summer and (2) the SAO dipole (SAOD) in winter. In this study, we present the analysis of observational data sets (1985–2014) showing the SASD and SAOD as largely constituting the same mode of ocean–atmosphere interaction reminiscent of the SAOD structure peaking in winter. Indeed, winter is the only season in which the inverse correlation between the northern and southern poles of both indices is statistically significant. The observed SASD and SAOD indices exhibit robust correlations ( P ≤ 0.001) in all seasons and these are reproduced by 54 of the 63 different models of the Coupled Models Intercomparison Project analysed. Their robust correlations notwithstanding the SASD and SAOD indices appear to better capture different aspects of SAO climate variability and teleconnections. |
author2 |
Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Nnamchi, Hyacinth C. Kucharski, Fred Keenlyside, Noel S. Farneti, Riccardo |
spellingShingle |
Nnamchi, Hyacinth C. Kucharski, Fred Keenlyside, Noel S. Farneti, Riccardo Analogous seasonal evolution of the South Atlantic SST dipole indices |
author_facet |
Nnamchi, Hyacinth C. Kucharski, Fred Keenlyside, Noel S. Farneti, Riccardo |
author_sort |
Nnamchi, Hyacinth C. |
title |
Analogous seasonal evolution of the South Atlantic SST dipole indices |
title_short |
Analogous seasonal evolution of the South Atlantic SST dipole indices |
title_full |
Analogous seasonal evolution of the South Atlantic SST dipole indices |
title_fullStr |
Analogous seasonal evolution of the South Atlantic SST dipole indices |
title_full_unstemmed |
Analogous seasonal evolution of the South Atlantic SST dipole indices |
title_sort |
analogous seasonal evolution of the south atlantic sst dipole indices |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1002/asl.781 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fasl.781 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/asl.781 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Atmospheric Science Letters volume 18, issue 10, page 396-402 ISSN 1530-261X 1530-261X |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/asl.781 |
container_title |
Atmospheric Science Letters |
container_volume |
18 |
container_issue |
10 |
container_start_page |
396 |
op_container_end_page |
402 |
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1810480056985714688 |