Asymmetries in Circulation Anomalies Related to the Phases of the North Atlantic Oscillation on Synoptic Time Scales
The North Atlantic Oscillation (NAO) index is often characterized by independent positive and negative NAO events with a characteristic spatial pattern and a typical lifetime of around 1 week. These events are separated by periods of near-neutral NAO conditions. Here, we challenge this view by showi...
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Online Access: | https://hdl.handle.net/11250/3090669 https://doi.org/10.1029/2022GL098149 |
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ftnorce:oai:norceresearch.brage.unit.no:11250/3090669 2023-10-25T01:41:09+02:00 Asymmetries in Circulation Anomalies Related to the Phases of the North Atlantic Oscillation on Synoptic Time Scales Schmith, T. Olsen, S.M. Yang, S. Christensen, Jens Hesselbjerg 2022 application/pdf https://hdl.handle.net/11250/3090669 https://doi.org/10.1029/2022GL098149 eng eng Fond: Independent Research Fond Denmark grant number 0217-00244B EC/H2020/727852 Geophysical Research Letters. 2022, 49 (11), . urn:issn:0094-8276 https://hdl.handle.net/11250/3090669 https://doi.org/10.1029/2022GL098149 cristin:2052356 Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no © 2022. The Authors Geophysical Research Letters 49 11 10 Peer reviewed Journal article 2022 ftnorce https://doi.org/10.1029/2022GL098149 2023-09-27T22:49:50Z The North Atlantic Oscillation (NAO) index is often characterized by independent positive and negative NAO events with a characteristic spatial pattern and a typical lifetime of around 1 week. These events are separated by periods of near-neutral NAO conditions. Here, we challenge this view by showing in reanalysis and observed data that the strength and spatial shape of NAO events depends on the NAO index prior to the window of 1 week and this dependency is most pronounced for negative NAO events. The influence is seen in the mean sea level pressure, and in other important features, including blocking frequency and jet stream characteristics, and also in air surface temperature and precipitation in parts of Europe. This new appreciation is important for efforts to improve methods for subseasonal-to-seasonal predictions of NAO. publishedVersion Article in Journal/Newspaper North Atlantic North Atlantic oscillation NORCE vitenarkiv (Norwegian Research Centre) Geophysical Research Letters 49 11 |
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Open Polar |
collection |
NORCE vitenarkiv (Norwegian Research Centre) |
op_collection_id |
ftnorce |
language |
English |
description |
The North Atlantic Oscillation (NAO) index is often characterized by independent positive and negative NAO events with a characteristic spatial pattern and a typical lifetime of around 1 week. These events are separated by periods of near-neutral NAO conditions. Here, we challenge this view by showing in reanalysis and observed data that the strength and spatial shape of NAO events depends on the NAO index prior to the window of 1 week and this dependency is most pronounced for negative NAO events. The influence is seen in the mean sea level pressure, and in other important features, including blocking frequency and jet stream characteristics, and also in air surface temperature and precipitation in parts of Europe. This new appreciation is important for efforts to improve methods for subseasonal-to-seasonal predictions of NAO. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Schmith, T. Olsen, S.M. Yang, S. Christensen, Jens Hesselbjerg |
spellingShingle |
Schmith, T. Olsen, S.M. Yang, S. Christensen, Jens Hesselbjerg Asymmetries in Circulation Anomalies Related to the Phases of the North Atlantic Oscillation on Synoptic Time Scales |
author_facet |
Schmith, T. Olsen, S.M. Yang, S. Christensen, Jens Hesselbjerg |
author_sort |
Schmith, T. |
title |
Asymmetries in Circulation Anomalies Related to the Phases of the North Atlantic Oscillation on Synoptic Time Scales |
title_short |
Asymmetries in Circulation Anomalies Related to the Phases of the North Atlantic Oscillation on Synoptic Time Scales |
title_full |
Asymmetries in Circulation Anomalies Related to the Phases of the North Atlantic Oscillation on Synoptic Time Scales |
title_fullStr |
Asymmetries in Circulation Anomalies Related to the Phases of the North Atlantic Oscillation on Synoptic Time Scales |
title_full_unstemmed |
Asymmetries in Circulation Anomalies Related to the Phases of the North Atlantic Oscillation on Synoptic Time Scales |
title_sort |
asymmetries in circulation anomalies related to the phases of the north atlantic oscillation on synoptic time scales |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/3090669 https://doi.org/10.1029/2022GL098149 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Geophysical Research Letters 49 11 10 |
op_relation |
Fond: Independent Research Fond Denmark grant number 0217-00244B EC/H2020/727852 Geophysical Research Letters. 2022, 49 (11), . urn:issn:0094-8276 https://hdl.handle.net/11250/3090669 https://doi.org/10.1029/2022GL098149 cristin:2052356 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no © 2022. The Authors |
op_doi |
https://doi.org/10.1029/2022GL098149 |
container_title |
Geophysical Research Letters |
container_volume |
49 |
container_issue |
11 |
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1780737189734252544 |