Intraseasonal effects of El Niño-Southern Oscillation on North Atlantic climate
This is the final version. Available from American Meteorological Society via the DOI in this record. It is well established that El Niño-Southern Oscillation (ENSO) impacts the North Atlantic-European (NAE) climate, with the strongest influence in winter. In late winter, the ENSO signal travels via...
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ftunivexeter:oai:ore.exeter.ac.uk:10871/36466 2024-09-09T19:55:45+00:00 Intraseasonal effects of El Niño-Southern Oscillation on North Atlantic climate Ayarzagüena, B Ineson, S Dunstone, NJ Baldwin, MP Scaife, AA 2018 http://hdl.handle.net/10871/36466 https://doi.org/10.1175/JCLI-D-18-0097.1 en eng American Meteorological Society Vol. 31, pp. 8861 - 8873 doi:10.1175/JCLI-D-18-0097.1 603557 618796 NE/M006123/1 http://hdl.handle.net/10871/36466 0894-8755 Journal of Climate © 2018 American Meteorological Society. All rights reserved. 2019-04-02 Under embargo until 2 April 2019 in compliance with publisher policy. http://www.rioxx.net/licenses/all-rights-reserved ENSO Teleconnections Article 2018 ftunivexeter https://doi.org/10.1175/JCLI-D-18-0097.1 2024-07-29T03:24:16Z This is the final version. Available from American Meteorological Society via the DOI in this record. It is well established that El Niño-Southern Oscillation (ENSO) impacts the North Atlantic-European (NAE) climate, with the strongest influence in winter. In late winter, the ENSO signal travels via both tropospheric and stratospheric pathways to the NAE sector and often projects onto the North Atlantic Oscillation. However, this signal does not strengthen gradually during winter, and some studies have suggested that the ENSO signal is different between early and late winter and that the teleconnections involved in the early winter subperiod are not well understood. In this study, we investigate the ENSO teleconnection to NAE in early winter (November-December) and characterize the possible mechanisms involved in that teleconnection. To do so, observations, reanalysis data and the output of different types of model simulations have been used. We show that the intraseasonal winter shift of the NAE response to ENSO is detected for both El Niño and La Niña and is significant in both observations and initialized predictions, but it is not reproduced by free-running Coupled Model Intercomparison Project phase 5 (CMIP5) models. The teleconnection is established through the troposphere in early winter and is related to ENSO effects over the Gulf of Mexico and Caribbean Sea that appear in rainfall and reach the NAE region. CMIP5 model biases in equatorial Pacific ENSO sea surface temperature patterns and strength appear to explain the lack of signal in the Gulf of Mexico and Caribbean Sea and, hence, their inability to reproduce the intraseasonal shift of the ENSO signal over Europe. European Commission European Commission Natural Environment Research Council (NERC) Article in Journal/Newspaper North Atlantic North Atlantic oscillation University of Exeter: Open Research Exeter (ORE) Pacific Journal of Climate 31 21 8861 8873 |
institution |
Open Polar |
collection |
University of Exeter: Open Research Exeter (ORE) |
op_collection_id |
ftunivexeter |
language |
English |
topic |
ENSO Teleconnections |
spellingShingle |
ENSO Teleconnections Ayarzagüena, B Ineson, S Dunstone, NJ Baldwin, MP Scaife, AA Intraseasonal effects of El Niño-Southern Oscillation on North Atlantic climate |
topic_facet |
ENSO Teleconnections |
description |
This is the final version. Available from American Meteorological Society via the DOI in this record. It is well established that El Niño-Southern Oscillation (ENSO) impacts the North Atlantic-European (NAE) climate, with the strongest influence in winter. In late winter, the ENSO signal travels via both tropospheric and stratospheric pathways to the NAE sector and often projects onto the North Atlantic Oscillation. However, this signal does not strengthen gradually during winter, and some studies have suggested that the ENSO signal is different between early and late winter and that the teleconnections involved in the early winter subperiod are not well understood. In this study, we investigate the ENSO teleconnection to NAE in early winter (November-December) and characterize the possible mechanisms involved in that teleconnection. To do so, observations, reanalysis data and the output of different types of model simulations have been used. We show that the intraseasonal winter shift of the NAE response to ENSO is detected for both El Niño and La Niña and is significant in both observations and initialized predictions, but it is not reproduced by free-running Coupled Model Intercomparison Project phase 5 (CMIP5) models. The teleconnection is established through the troposphere in early winter and is related to ENSO effects over the Gulf of Mexico and Caribbean Sea that appear in rainfall and reach the NAE region. CMIP5 model biases in equatorial Pacific ENSO sea surface temperature patterns and strength appear to explain the lack of signal in the Gulf of Mexico and Caribbean Sea and, hence, their inability to reproduce the intraseasonal shift of the ENSO signal over Europe. European Commission European Commission Natural Environment Research Council (NERC) |
format |
Article in Journal/Newspaper |
author |
Ayarzagüena, B Ineson, S Dunstone, NJ Baldwin, MP Scaife, AA |
author_facet |
Ayarzagüena, B Ineson, S Dunstone, NJ Baldwin, MP Scaife, AA |
author_sort |
Ayarzagüena, B |
title |
Intraseasonal effects of El Niño-Southern Oscillation on North Atlantic climate |
title_short |
Intraseasonal effects of El Niño-Southern Oscillation on North Atlantic climate |
title_full |
Intraseasonal effects of El Niño-Southern Oscillation on North Atlantic climate |
title_fullStr |
Intraseasonal effects of El Niño-Southern Oscillation on North Atlantic climate |
title_full_unstemmed |
Intraseasonal effects of El Niño-Southern Oscillation on North Atlantic climate |
title_sort |
intraseasonal effects of el niño-southern oscillation on north atlantic climate |
publisher |
American Meteorological Society |
publishDate |
2018 |
url |
http://hdl.handle.net/10871/36466 https://doi.org/10.1175/JCLI-D-18-0097.1 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
Vol. 31, pp. 8861 - 8873 doi:10.1175/JCLI-D-18-0097.1 603557 618796 NE/M006123/1 http://hdl.handle.net/10871/36466 0894-8755 Journal of Climate |
op_rights |
© 2018 American Meteorological Society. All rights reserved. 2019-04-02 Under embargo until 2 April 2019 in compliance with publisher policy. http://www.rioxx.net/licenses/all-rights-reserved |
op_doi |
https://doi.org/10.1175/JCLI-D-18-0097.1 |
container_title |
Journal of Climate |
container_volume |
31 |
container_issue |
21 |
container_start_page |
8861 |
op_container_end_page |
8873 |
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1809925880955273216 |