Diabatic effects on the evolution of storm tracks
Despite the crucial role of moist diabatic processes in mid-latitude 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 proce...
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Online Access: | https://hdl.handle.net/11250/3145366 https://doi.org/10.5194/wcd-4-927-2023 |
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ftunivbergen:oai:bora.uib.no:11250/3145366 2024-09-09T19:57:35+00:00 Diabatic effects on the evolution of storm tracks Marcheggiani, Andrea Spengler, Thomas 2023 application/pdf https://hdl.handle.net/11250/3145366 https://doi.org/10.5194/wcd-4-927-2023 eng eng Copernicus Publications Norges forskningsråd: 324081 urn:issn:2698-4024 https://hdl.handle.net/11250/3145366 https://doi.org/10.5194/wcd-4-927-2023 cristin:2193378 Weather and Climate Dynamics (WCD). 2023, 4 (4), 927-942. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2023 The Author(s) Weather and Climate Dynamics (WCD) 927-942 4 Journal article Peer reviewed 2023 ftunivbergen https://doi.org/10.5194/wcd-4-927-2023 2024-08-13T23:41:38Z Despite the crucial role of moist diabatic processes in mid-latitude 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 (900–825 hPa), 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 (750–350 hPa), on the other hand, the diabatic generation of the 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 same phasing between diabatic and tilting tendencies of the slope is observed both in upstream and downstream sectors of the North Atlantic and North Pacific storm tracks. This suggests that the reversed behaviour between near-surface and free troposphere is a general feature of mid-latitude storm tracks. In addition, we find a correspondence between the diabatic generation of the 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. publishedVersion Article in Journal/Newspaper North Atlantic University of Bergen: Bergen Open Research Archive (BORA-UiB) Pacific Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) Weather and Climate Dynamics 4 4 927 942 |
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Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Despite the crucial role of moist diabatic processes in mid-latitude 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 (900–825 hPa), 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 (750–350 hPa), on the other hand, the diabatic generation of the 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 same phasing between diabatic and tilting tendencies of the slope is observed both in upstream and downstream sectors of the North Atlantic and North Pacific storm tracks. This suggests that the reversed behaviour between near-surface and free troposphere is a general feature of mid-latitude storm tracks. In addition, we find a correspondence between the diabatic generation of the 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. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Marcheggiani, Andrea Spengler, Thomas |
spellingShingle |
Marcheggiani, Andrea Spengler, Thomas Diabatic effects on the evolution of storm tracks |
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://hdl.handle.net/11250/3145366 https://doi.org/10.5194/wcd-4-927-2023 |
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_source |
Weather and Climate Dynamics (WCD) 927-942 4 |
op_relation |
Norges forskningsråd: 324081 urn:issn:2698-4024 https://hdl.handle.net/11250/3145366 https://doi.org/10.5194/wcd-4-927-2023 cristin:2193378 Weather and Climate Dynamics (WCD). 2023, 4 (4), 927-942. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2023 The Author(s) |
op_doi |
https://doi.org/10.5194/wcd-4-927-2023 |
container_title |
Weather and Climate Dynamics |
container_volume |
4 |
container_issue |
4 |
container_start_page |
927 |
op_container_end_page |
942 |
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1809928507858354176 |