Diabatic effects on the evolution of storm tracks
Despite the crucial role of moist diabatic processes in midlatitude storm tracks and related model biases, we still lack a more complete theoretical understanding of how diabatic processes affect the evolution of storm tracks. To alleviate this shortcoming, we investigate the role of diabatic proces...
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Copernicus Publications
2023
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00067701 2023-07-30T04:05:30+02:00 Diabatic effects on the evolution of storm tracks Marcheggiani, Andrea Spengler, Thomas 2023-07 electronic https://doi.org/10.5194/egusphere-2023-1537 https://noa.gwlb.de/receive/cop_mods_00067701 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066148/egusphere-2023-1537.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1537/egusphere-2023-1537.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2023-1537 https://noa.gwlb.de/receive/cop_mods_00067701 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066148/egusphere-2023-1537.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1537/egusphere-2023-1537.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/egusphere-2023-1537 2023-07-16T23:19:15Z Despite the crucial role of moist diabatic processes in midlatitude storm tracks and related model biases, we still lack a more complete theoretical understanding of how diabatic processes affect the evolution of storm tracks. To alleviate this shortcoming, we investigate the role of diabatic processes in the evolution of the Northern Hemispheric storm tracks using a framework based on the tendency of the slope of isentropic surfaces as a measure of baroclinic development. We identify opposing behaviours in the near-surface and free troposphere for the relationship between the flattening of the slope of isentropic surfaces and its restoration by diabatic processes. Near the surface (900–800hPa), cold air advection associated with cold air outbreaks initially acts to flatten isentropic surfaces, with air–sea interactions ensuing to restore surface baroclinicity. In the free troposphere (750–350hPa), on the other hand, diabatic generation of slope of isentropic surfaces precedes its depletion due to tilting by eddies, suggesting the primary importance of moist diabatic processes in triggering subsequent baroclinic development. The observed phasing of the diabatic and tilting tendencies of the slope is observed both in upstream and downstream sectors of the North Atlantic and North Pacific storm tracks, rendering the phasing a general feature of midlatitude storm tracks. In addition, we find a correspondence between the diabatic generation of slope of isentropic surfaces and enhanced precipitation as well as moisture availability, further underlining the crucial role of moisture and moist processes in the self-maintenance of storm tracks. Article in Journal/Newspaper North Atlantic Niedersächsisches Online-Archiv NOA Pacific Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Marcheggiani, Andrea Spengler, Thomas Diabatic effects on the evolution of storm tracks |
topic_facet |
article Verlagsveröffentlichung |
description |
Despite the crucial role of moist diabatic processes in midlatitude storm tracks and related model biases, we still lack a more complete theoretical understanding of how diabatic processes affect the evolution of storm tracks. To alleviate this shortcoming, we investigate the role of diabatic processes in the evolution of the Northern Hemispheric storm tracks using a framework based on the tendency of the slope of isentropic surfaces as a measure of baroclinic development. We identify opposing behaviours in the near-surface and free troposphere for the relationship between the flattening of the slope of isentropic surfaces and its restoration by diabatic processes. Near the surface (900–800hPa), cold air advection associated with cold air outbreaks initially acts to flatten isentropic surfaces, with air–sea interactions ensuing to restore surface baroclinicity. In the free troposphere (750–350hPa), on the other hand, diabatic generation of slope of isentropic surfaces precedes its depletion due to tilting by eddies, suggesting the primary importance of moist diabatic processes in triggering subsequent baroclinic development. The observed phasing of the diabatic and tilting tendencies of the slope is observed both in upstream and downstream sectors of the North Atlantic and North Pacific storm tracks, rendering the phasing a general feature of midlatitude storm tracks. In addition, we find a correspondence between the diabatic generation of slope of isentropic surfaces and enhanced precipitation as well as moisture availability, further underlining the crucial role of moisture and moist processes in the self-maintenance of storm tracks. |
format |
Article in Journal/Newspaper |
author |
Marcheggiani, Andrea Spengler, Thomas |
author_facet |
Marcheggiani, Andrea Spengler, Thomas |
author_sort |
Marcheggiani, Andrea |
title |
Diabatic effects on the evolution of storm tracks |
title_short |
Diabatic effects on the evolution of storm tracks |
title_full |
Diabatic effects on the evolution of storm tracks |
title_fullStr |
Diabatic effects on the evolution of storm tracks |
title_full_unstemmed |
Diabatic effects on the evolution of storm tracks |
title_sort |
diabatic effects on the evolution of storm tracks |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2023-1537 https://noa.gwlb.de/receive/cop_mods_00067701 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066148/egusphere-2023-1537.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1537/egusphere-2023-1537.pdf |
long_lat |
ENVELOPE(-54.065,-54.065,49.700,49.700) |
geographic |
Pacific Tilting |
geographic_facet |
Pacific Tilting |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://doi.org/10.5194/egusphere-2023-1537 https://noa.gwlb.de/receive/cop_mods_00067701 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00066148/egusphere-2023-1537.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1537/egusphere-2023-1537.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2023-1537 |
_version_ |
1772817467569078272 |