Changes in mean flow and atmospheric wave activity in the North Atlantic sector
In recent years, the midlatitudes are characterized by more intense heatwaves in summer and sometimes severe cold spells in winter that might emanate from changes in atmospheric circulation, including synoptic‐scale and planetary wave activity in the midlatitudes. In this study, we investigate the h...
Published in: | Quarterly Journal of the Royal Meteorological Society |
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ftunivwuerz:oai:opus.bibliothek.uni-wuerzburg.de:20807 2023-09-05T13:21:24+02:00 Changes in mean flow and atmospheric wave activity in the North Atlantic sector Paeth, Heiko Pollinger, Felix 2019 application/pdf https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/20807 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-208079 https://doi.org/10.1002/qj.3660 https://opus.bibliothek.uni-wuerzburg.de/files/20807/Paeth_Quarterly_Journal.pdf eng eng https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/20807 urn:nbn:de:bvb:20-opus-208079 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-208079 https://doi.org/10.1002/qj.3660 https://opus.bibliothek.uni-wuerzburg.de/files/20807/Paeth_Quarterly_Journal.pdf https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess ddc:550 article doc-type:article 2019 ftunivwuerz https://doi.org/10.1002/qj.3660 2023-08-13T22:34:23Z In recent years, the midlatitudes are characterized by more intense heatwaves in summer and sometimes severe cold spells in winter that might emanate from changes in atmospheric circulation, including synoptic‐scale and planetary wave activity in the midlatitudes. In this study, we investigate the heat and momentum exchange between the mean flow and atmospheric waves in the North Atlantic sector and adjacent continents by means of the physically consistent Eliassen–Palm flux diagnostics applied to reanalysis and forced climate model data. In the long‐term mean, momentum is transferred from the mean flow to atmospheric waves in the northwest Atlantic region, where cyclogenesis prevails. Further downstream over Europe, eddy fluxes return momentum to the mean flow, sustaining the jet stream against friction. A global climate model is able to reproduce this pattern with high accuracy. Atmospheric variability related to atmospheric wave activity is much more expressed at the intraseasonal rather than the interannual time‐scale. Over the last 40 years, reanalyses reveal a northward shift of the jet stream and a weakening of intraseasonal weather variability related to synoptic‐scale and planetary wave activity. This pertains to the winter and summer seasons, especially over central Europe, and correlates with changes in the North Atlantic Oscillation as well as regional temperature and precipitation. A very similar phenomenon is found in a climate model simulation with business‐as‐usual scenario, suggesting an anthropogenic trigger in the weakening of intraseasonal weather variability in the midlatitudes. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Northwest Atlantic Würzburg University: Online Publication Service Quarterly Journal of the Royal Meteorological Society 145 725 3801 3818 |
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Würzburg University: Online Publication Service |
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English |
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ddc:550 |
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ddc:550 Paeth, Heiko Pollinger, Felix Changes in mean flow and atmospheric wave activity in the North Atlantic sector |
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ddc:550 |
description |
In recent years, the midlatitudes are characterized by more intense heatwaves in summer and sometimes severe cold spells in winter that might emanate from changes in atmospheric circulation, including synoptic‐scale and planetary wave activity in the midlatitudes. In this study, we investigate the heat and momentum exchange between the mean flow and atmospheric waves in the North Atlantic sector and adjacent continents by means of the physically consistent Eliassen–Palm flux diagnostics applied to reanalysis and forced climate model data. In the long‐term mean, momentum is transferred from the mean flow to atmospheric waves in the northwest Atlantic region, where cyclogenesis prevails. Further downstream over Europe, eddy fluxes return momentum to the mean flow, sustaining the jet stream against friction. A global climate model is able to reproduce this pattern with high accuracy. Atmospheric variability related to atmospheric wave activity is much more expressed at the intraseasonal rather than the interannual time‐scale. Over the last 40 years, reanalyses reveal a northward shift of the jet stream and a weakening of intraseasonal weather variability related to synoptic‐scale and planetary wave activity. This pertains to the winter and summer seasons, especially over central Europe, and correlates with changes in the North Atlantic Oscillation as well as regional temperature and precipitation. A very similar phenomenon is found in a climate model simulation with business‐as‐usual scenario, suggesting an anthropogenic trigger in the weakening of intraseasonal weather variability in the midlatitudes. |
format |
Article in Journal/Newspaper |
author |
Paeth, Heiko Pollinger, Felix |
author_facet |
Paeth, Heiko Pollinger, Felix |
author_sort |
Paeth, Heiko |
title |
Changes in mean flow and atmospheric wave activity in the North Atlantic sector |
title_short |
Changes in mean flow and atmospheric wave activity in the North Atlantic sector |
title_full |
Changes in mean flow and atmospheric wave activity in the North Atlantic sector |
title_fullStr |
Changes in mean flow and atmospheric wave activity in the North Atlantic sector |
title_full_unstemmed |
Changes in mean flow and atmospheric wave activity in the North Atlantic sector |
title_sort |
changes in mean flow and atmospheric wave activity in the north atlantic sector |
publishDate |
2019 |
url |
https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/20807 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-208079 https://doi.org/10.1002/qj.3660 https://opus.bibliothek.uni-wuerzburg.de/files/20807/Paeth_Quarterly_Journal.pdf |
genre |
North Atlantic North Atlantic oscillation Northwest Atlantic |
genre_facet |
North Atlantic North Atlantic oscillation Northwest Atlantic |
op_relation |
https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/20807 urn:nbn:de:bvb:20-opus-208079 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-208079 https://doi.org/10.1002/qj.3660 https://opus.bibliothek.uni-wuerzburg.de/files/20807/Paeth_Quarterly_Journal.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/qj.3660 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
145 |
container_issue |
725 |
container_start_page |
3801 |
op_container_end_page |
3818 |
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1776202004616445952 |