Modulation of the El Niño teleconnection to the North Atlantic by the tropical North Atlantic during boreal spring and summer
Equatorial Pacific sea surface temperature anomalies (SSTAs) associated with El Niño–Southern Oscillation (ENSO) can influence the North Atlantic European (NAE) region. ENSO tends to be negatively correlated with the North Atlantic Oscillation in winter, while this connection is less clear in boreal...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus
2022
|
Subjects: | |
Online Access: | https://hdl.handle.net/20.500.11850/574073 https://doi.org/10.3929/ethz-b-000574073 |
id |
ftethz:oai:www.research-collection.ethz.ch:20.500.11850/574073 |
---|---|
record_format |
openpolar |
spelling |
ftethz:oai:www.research-collection.ethz.ch:20.500.11850/574073 2023-07-30T04:05:10+02:00 Modulation of the El Niño teleconnection to the North Atlantic by the tropical North Atlantic during boreal spring and summer Casselman, Jake W. Jiménez Esteve, Bernat id_orcid:0 000-0003-2706-5309 Domeisen, Daniela id_orcid:0 000-0002-1463-929X 2022 application/application/pdf https://hdl.handle.net/20.500.11850/574073 https://doi.org/10.3929/ethz-b-000574073 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/wcd-3-1077-2022 info:eu-repo/grantAgreement/ETHZ/ETH Grants/ETH-17 18-1 info:eu-repo/grantAgreement/EC/H2020/847456 info:eu-repo/grantAgreement/SNF/SNF-Förderungsprofessuren Stufe 2/170523 info:eu-repo/grantAgreement/SNF/SNF-Förderungsprofessuren: Fortsetzungsgesuche/198896 http://hdl.handle.net/20.500.11850/574073 doi:10.3929/ethz-b-000574073 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International Weather and Climate Dynamics, 3 (3) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftethz https://doi.org/20.500.11850/57407310.3929/ethz-b-00057407310.5194/wcd-3-1077-2022 2023-07-16T23:48:51Z Equatorial Pacific sea surface temperature anomalies (SSTAs) associated with El Niño–Southern Oscillation (ENSO) can influence the North Atlantic European (NAE) region. ENSO tends to be negatively correlated with the North Atlantic Oscillation in winter, while this connection is less clear in boreal spring and summer when the ENSO teleconnection encounters altered background conditions (i.e., a weaker subtropical jet), which can modulate the signal on the way to the NAE region. One such region that modulates the ENSO teleconnection to the NAE region is the tropical North Atlantic (TNA). While several mechanisms exist for this modulation, we center our analysis on the Caribbean region and the Walker cells. In order to isolate the relevant mechanism, we force an idealized atmospheric circulation model with three different seasonally varying sea surface temperature patterns that represent an ENSO event with or without the influence of the TNA, focusing on the decaying phase of ENSO in boreal spring and summer. We find that in boreal spring, the TNA modulates the ENSO teleconnection to the NAE primarily through a propagating Rossby wave train, while in summer, the TNA's influence tends to strengthen the ENSO influence over the NAE sector. Overall, this study offers a deeper understanding of the inter-basin interactions through the Walker cell following an ENSO event and the central role of tropical Atlantic SSTAs in modulating the teleconnection to the NAE region in boreal spring and summer. ISSN:2698-4016 ISSN:2698-4008 Article in Journal/Newspaper North Atlantic North Atlantic oscillation ETH Zürich Research Collection Pacific |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
description |
Equatorial Pacific sea surface temperature anomalies (SSTAs) associated with El Niño–Southern Oscillation (ENSO) can influence the North Atlantic European (NAE) region. ENSO tends to be negatively correlated with the North Atlantic Oscillation in winter, while this connection is less clear in boreal spring and summer when the ENSO teleconnection encounters altered background conditions (i.e., a weaker subtropical jet), which can modulate the signal on the way to the NAE region. One such region that modulates the ENSO teleconnection to the NAE region is the tropical North Atlantic (TNA). While several mechanisms exist for this modulation, we center our analysis on the Caribbean region and the Walker cells. In order to isolate the relevant mechanism, we force an idealized atmospheric circulation model with three different seasonally varying sea surface temperature patterns that represent an ENSO event with or without the influence of the TNA, focusing on the decaying phase of ENSO in boreal spring and summer. We find that in boreal spring, the TNA modulates the ENSO teleconnection to the NAE primarily through a propagating Rossby wave train, while in summer, the TNA's influence tends to strengthen the ENSO influence over the NAE sector. Overall, this study offers a deeper understanding of the inter-basin interactions through the Walker cell following an ENSO event and the central role of tropical Atlantic SSTAs in modulating the teleconnection to the NAE region in boreal spring and summer. ISSN:2698-4016 ISSN:2698-4008 |
format |
Article in Journal/Newspaper |
author |
Casselman, Jake W. Jiménez Esteve, Bernat id_orcid:0 000-0003-2706-5309 Domeisen, Daniela id_orcid:0 000-0002-1463-929X |
spellingShingle |
Casselman, Jake W. Jiménez Esteve, Bernat id_orcid:0 000-0003-2706-5309 Domeisen, Daniela id_orcid:0 000-0002-1463-929X Modulation of the El Niño teleconnection to the North Atlantic by the tropical North Atlantic during boreal spring and summer |
author_facet |
Casselman, Jake W. Jiménez Esteve, Bernat id_orcid:0 000-0003-2706-5309 Domeisen, Daniela id_orcid:0 000-0002-1463-929X |
author_sort |
Casselman, Jake W. |
title |
Modulation of the El Niño teleconnection to the North Atlantic by the tropical North Atlantic during boreal spring and summer |
title_short |
Modulation of the El Niño teleconnection to the North Atlantic by the tropical North Atlantic during boreal spring and summer |
title_full |
Modulation of the El Niño teleconnection to the North Atlantic by the tropical North Atlantic during boreal spring and summer |
title_fullStr |
Modulation of the El Niño teleconnection to the North Atlantic by the tropical North Atlantic during boreal spring and summer |
title_full_unstemmed |
Modulation of the El Niño teleconnection to the North Atlantic by the tropical North Atlantic during boreal spring and summer |
title_sort |
modulation of the el niño teleconnection to the north atlantic by the tropical north atlantic during boreal spring and summer |
publisher |
Copernicus |
publishDate |
2022 |
url |
https://hdl.handle.net/20.500.11850/574073 https://doi.org/10.3929/ethz-b-000574073 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Weather and Climate Dynamics, 3 (3) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/wcd-3-1077-2022 info:eu-repo/grantAgreement/ETHZ/ETH Grants/ETH-17 18-1 info:eu-repo/grantAgreement/EC/H2020/847456 info:eu-repo/grantAgreement/SNF/SNF-Förderungsprofessuren Stufe 2/170523 info:eu-repo/grantAgreement/SNF/SNF-Förderungsprofessuren: Fortsetzungsgesuche/198896 http://hdl.handle.net/20.500.11850/574073 doi:10.3929/ethz-b-000574073 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_doi |
https://doi.org/20.500.11850/57407310.3929/ethz-b-00057407310.5194/wcd-3-1077-2022 |
_version_ |
1772816931856842752 |