Nonlinearity in the tropospheric pathway of ENSO to the North Atlantic
The El Niño–Southern Oscillation (ENSO) can exert a remote impact on North Atlantic and European (NAE) winter climate. This teleconnection is driven by the superposition and interaction of different influences, which are generally grouped into two main pathways, namely the tropospheric and stratosph...
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2020
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00051420 2023-05-15T17:27:36+02:00 Nonlinearity in the tropospheric pathway of ENSO to the North Atlantic Jiménez-Esteve, Bernat Domeisen, Daniela I. V. 2020-05 electronic https://doi.org/10.5194/wcd-1-225-2020 https://noa.gwlb.de/receive/cop_mods_00051420 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051076/wcd-1-225-2020.pdf https://wcd.copernicus.org/articles/1/225/2020/wcd-1-225-2020.pdf eng eng Copernicus Publications Weather and Climate Dynamics -- https://www.weather-climate-dynamics.net/ -- 2698-4016 https://doi.org/10.5194/wcd-1-225-2020 https://noa.gwlb.de/receive/cop_mods_00051420 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051076/wcd-1-225-2020.pdf https://wcd.copernicus.org/articles/1/225/2020/wcd-1-225-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/wcd-1-225-2020 2022-02-08T22:36:26Z The El Niño–Southern Oscillation (ENSO) can exert a remote impact on North Atlantic and European (NAE) winter climate. This teleconnection is driven by the superposition and interaction of different influences, which are generally grouped into two main pathways, namely the tropospheric and stratospheric pathways. In this study, we focus on the tropospheric pathway through the North Pacific and across the North American continent. Due to the possible nonstationary behavior and the limited time period covered by reanalysis datasets, the potential nonlinearity of this pathway remains unclear. In order to address this question, we use a simplified physics atmospheric model forced with seasonally varying prescribed sea surface temperatures (SST) following the evolution of different ENSO phases with linearly varying strength at a fixed location. To isolate the tropospheric pathway the zonal mean stratospheric winds are nudged towards the model climatology. The model experiments indicate that the tropospheric pathway of ENSO to the North Atlantic exhibits significant nonlinearity with respect to the tropical SST forcing, both in terms of the location and amplitude of the impacts. For example, strong El Niño leads to a significantly stronger impact on the North Atlantic Oscillation (NAO) than a La Niña forcing of the same amplitude. For La Niña forcings, there is a saturation in the response, with no further increase in the NAO impact even when doubling the SST forcing, while this is not the case for El Niño. These findings may have important consequences for long-range prediction of the North Atlantic and Europe. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Niedersächsisches Online-Archiv NOA Pacific Weather and Climate Dynamics 1 1 225 245 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Jiménez-Esteve, Bernat Domeisen, Daniela I. V. Nonlinearity in the tropospheric pathway of ENSO to the North Atlantic |
topic_facet |
article Verlagsveröffentlichung |
description |
The El Niño–Southern Oscillation (ENSO) can exert a remote impact on North Atlantic and European (NAE) winter climate. This teleconnection is driven by the superposition and interaction of different influences, which are generally grouped into two main pathways, namely the tropospheric and stratospheric pathways. In this study, we focus on the tropospheric pathway through the North Pacific and across the North American continent. Due to the possible nonstationary behavior and the limited time period covered by reanalysis datasets, the potential nonlinearity of this pathway remains unclear. In order to address this question, we use a simplified physics atmospheric model forced with seasonally varying prescribed sea surface temperatures (SST) following the evolution of different ENSO phases with linearly varying strength at a fixed location. To isolate the tropospheric pathway the zonal mean stratospheric winds are nudged towards the model climatology. The model experiments indicate that the tropospheric pathway of ENSO to the North Atlantic exhibits significant nonlinearity with respect to the tropical SST forcing, both in terms of the location and amplitude of the impacts. For example, strong El Niño leads to a significantly stronger impact on the North Atlantic Oscillation (NAO) than a La Niña forcing of the same amplitude. For La Niña forcings, there is a saturation in the response, with no further increase in the NAO impact even when doubling the SST forcing, while this is not the case for El Niño. These findings may have important consequences for long-range prediction of the North Atlantic and Europe. |
format |
Article in Journal/Newspaper |
author |
Jiménez-Esteve, Bernat Domeisen, Daniela I. V. |
author_facet |
Jiménez-Esteve, Bernat Domeisen, Daniela I. V. |
author_sort |
Jiménez-Esteve, Bernat |
title |
Nonlinearity in the tropospheric pathway of ENSO to the North Atlantic |
title_short |
Nonlinearity in the tropospheric pathway of ENSO to the North Atlantic |
title_full |
Nonlinearity in the tropospheric pathway of ENSO to the North Atlantic |
title_fullStr |
Nonlinearity in the tropospheric pathway of ENSO to the North Atlantic |
title_full_unstemmed |
Nonlinearity in the tropospheric pathway of ENSO to the North Atlantic |
title_sort |
nonlinearity in the tropospheric pathway of enso to the north atlantic |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/wcd-1-225-2020 https://noa.gwlb.de/receive/cop_mods_00051420 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051076/wcd-1-225-2020.pdf https://wcd.copernicus.org/articles/1/225/2020/wcd-1-225-2020.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
Weather and Climate Dynamics -- https://www.weather-climate-dynamics.net/ -- 2698-4016 https://doi.org/10.5194/wcd-1-225-2020 https://noa.gwlb.de/receive/cop_mods_00051420 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00051076/wcd-1-225-2020.pdf https://wcd.copernicus.org/articles/1/225/2020/wcd-1-225-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/wcd-1-225-2020 |
container_title |
Weather and Climate Dynamics |
container_volume |
1 |
container_issue |
1 |
container_start_page |
225 |
op_container_end_page |
245 |
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1766119776058343424 |