Suppressed eddy driving during southward excursions of the North Atlantic jet on synoptic to seasonal time scales
Jet streams shape midlatitude weather and climate. The North Atlantic jet is mainly eddy‐driven, with frequent north–south excursions on synoptic time scales arising from eddy forcings and feedbacks. There are, however, special periods during which the underlying dynamics appear to change—for exampl...
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Online Access: | https://hdl.handle.net/1956/22482 https://doi.org/10.1002/asl.937 |
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ftunivbergen:oai:bora.uib.no:1956/22482 2023-05-15T17:28:22+02:00 Suppressed eddy driving during southward excursions of the North Atlantic jet on synoptic to seasonal time scales Madonna, Erica Li, Camille Wettstein, Justin 2020-01-29T13:56:48Z application/pdf https://hdl.handle.net/1956/22482 https://doi.org/10.1002/asl.937 eng eng Wiley Norges forskningsråd: 255027 Norges forskningsråd: 231716 urn:issn:1530-261X https://hdl.handle.net/1956/22482 https://doi.org/10.1002/asl.937 cristin:1724372 Attribution CC BY http://creativecommons.org/licenses/by/4.0/ Copyright 2019 The Author(s) Atmospheric Science Letters climate variability eddy-mean flow interactions Jet stream North Atlantic Peer reviewed Journal article 2020 ftunivbergen https://doi.org/10.1002/asl.937 2023-03-14T17:41:07Z Jet streams shape midlatitude weather and climate. The North Atlantic jet is mainly eddy‐driven, with frequent north–south excursions on synoptic time scales arising from eddy forcings and feedbacks. There are, however, special periods during which the underlying dynamics appear to change—for example, winter 2009/2010, when the jet was persistently southward‐shifted, extremely zonal, and more thermally driven. This study shows evidence that the southern jet configuration exhibits altered dynamical behavior involving a shift in the balance of thermal and eddy‐driving processes, independent of timescale. Specifically, southern jets exhibit weaker eddy feedbacks and are associated with enhanced heating in the tropical Pacific. During winter 2009/2010, a remarkably frequent (66 days out of the 90‐day winter season) and persistent southern jet shaped the unusual seasonal signature. These results bridge the synoptic and climate perspectives of jet variability, with potential to help understand and reduce biases in regional climate variability as simulated by models. publishedVersion Article in Journal/Newspaper North Atlantic University of Bergen: Bergen Open Research Archive (BORA-UiB) Pacific Atmospheric Science Letters 20 9 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
climate variability eddy-mean flow interactions Jet stream North Atlantic |
spellingShingle |
climate variability eddy-mean flow interactions Jet stream North Atlantic Madonna, Erica Li, Camille Wettstein, Justin Suppressed eddy driving during southward excursions of the North Atlantic jet on synoptic to seasonal time scales |
topic_facet |
climate variability eddy-mean flow interactions Jet stream North Atlantic |
description |
Jet streams shape midlatitude weather and climate. The North Atlantic jet is mainly eddy‐driven, with frequent north–south excursions on synoptic time scales arising from eddy forcings and feedbacks. There are, however, special periods during which the underlying dynamics appear to change—for example, winter 2009/2010, when the jet was persistently southward‐shifted, extremely zonal, and more thermally driven. This study shows evidence that the southern jet configuration exhibits altered dynamical behavior involving a shift in the balance of thermal and eddy‐driving processes, independent of timescale. Specifically, southern jets exhibit weaker eddy feedbacks and are associated with enhanced heating in the tropical Pacific. During winter 2009/2010, a remarkably frequent (66 days out of the 90‐day winter season) and persistent southern jet shaped the unusual seasonal signature. These results bridge the synoptic and climate perspectives of jet variability, with potential to help understand and reduce biases in regional climate variability as simulated by models. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Madonna, Erica Li, Camille Wettstein, Justin |
author_facet |
Madonna, Erica Li, Camille Wettstein, Justin |
author_sort |
Madonna, Erica |
title |
Suppressed eddy driving during southward excursions of the North Atlantic jet on synoptic to seasonal time scales |
title_short |
Suppressed eddy driving during southward excursions of the North Atlantic jet on synoptic to seasonal time scales |
title_full |
Suppressed eddy driving during southward excursions of the North Atlantic jet on synoptic to seasonal time scales |
title_fullStr |
Suppressed eddy driving during southward excursions of the North Atlantic jet on synoptic to seasonal time scales |
title_full_unstemmed |
Suppressed eddy driving during southward excursions of the North Atlantic jet on synoptic to seasonal time scales |
title_sort |
suppressed eddy driving during southward excursions of the north atlantic jet on synoptic to seasonal time scales |
publisher |
Wiley |
publishDate |
2020 |
url |
https://hdl.handle.net/1956/22482 https://doi.org/10.1002/asl.937 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmospheric Science Letters |
op_relation |
Norges forskningsråd: 255027 Norges forskningsråd: 231716 urn:issn:1530-261X https://hdl.handle.net/1956/22482 https://doi.org/10.1002/asl.937 cristin:1724372 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/4.0/ Copyright 2019 The Author(s) |
op_doi |
https://doi.org/10.1002/asl.937 |
container_title |
Atmospheric Science Letters |
container_volume |
20 |
container_issue |
9 |
_version_ |
1766120993635434496 |