The key role of diabatic processes in modifying the upper‐tropospheric wave guide: a North Atlantic case‐study
Abstract This study highlights the importance of diabatic processes for the complex interaction of weather systems in the North Atlantic–European sector during the week of 7–14 September 2008. A chain of events occurred including the extratropical transition (ET) of hurricane Hanna , a subsequently...
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crwiley:10.1002/qj.891 2024-09-09T19:53:49+00:00 The key role of diabatic processes in modifying the upper‐tropospheric wave guide: a North Atlantic case‐study Grams, Christian M. Wernli, Heini Böttcher, Maxi Čampa, Jana Corsmeier, Ulrich Jones, Sarah C. Keller, Julia H. Lenz, Claus‐Jürgen Wiegand, Lars 2011 http://dx.doi.org/10.1002/qj.891 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.891 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.891 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Quarterly Journal of the Royal Meteorological Society volume 137, issue 661, page 2174-2193 ISSN 0035-9009 1477-870X journal-article 2011 crwiley https://doi.org/10.1002/qj.891 2024-08-09T04:25:34Z Abstract This study highlights the importance of diabatic processes for the complex interaction of weather systems in the North Atlantic–European sector during the week of 7–14 September 2008. A chain of events occurred including the extratropical transition (ET) of hurricane Hanna , a subsequently developing extratropical cyclone, the formation of an upper‐level potential vorticity (PV) streamer that protruded towards Europe and triggered intense rainfall, and the genesis of a Mediterranean cyclone. A PV perspective is adopted along with trajectory calculations to elucidate the diabatic modification of the midlatitude flow. Important diabatic PV modifications occurred at upper levels, associated with the cross‐isentropic transport of low‐PV air within warm conveyor belts (WCBs). These were diagnosed during the ET of Hanna and the development of the extratropical cyclone near Newfoundland. The WCBs contributed to the amplification of ridges downstream of each cyclone and to the subsequent elongation of Hanna 's upstream trough into a PV streamer. This streamer eventually triggered the Mediterranean cyclogenesis. The second major effect of the diabatic processes occurred on smaller scales, in the low and middle troposphere. The remnants of Hanna 's tropical PV core advected moist air towards the baroclinic zone leading to condensational PV production in the lower troposphere. In contrast, in the case of the extratropical cyclone, diabatic PV production occurred within its WCB at mid levels. These diagnostic analyses corroborate the potential of diabatic processes associated with extratropical flow systems for the modification of both the low‐level vortices and the upper‐level Rossby wave guide. Copyright © 2011 Royal Meteorological Society Article in Journal/Newspaper Newfoundland North Atlantic Wiley Online Library Quarterly Journal of the Royal Meteorological Society 137 661 2174 2193 |
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English |
description |
Abstract This study highlights the importance of diabatic processes for the complex interaction of weather systems in the North Atlantic–European sector during the week of 7–14 September 2008. A chain of events occurred including the extratropical transition (ET) of hurricane Hanna , a subsequently developing extratropical cyclone, the formation of an upper‐level potential vorticity (PV) streamer that protruded towards Europe and triggered intense rainfall, and the genesis of a Mediterranean cyclone. A PV perspective is adopted along with trajectory calculations to elucidate the diabatic modification of the midlatitude flow. Important diabatic PV modifications occurred at upper levels, associated with the cross‐isentropic transport of low‐PV air within warm conveyor belts (WCBs). These were diagnosed during the ET of Hanna and the development of the extratropical cyclone near Newfoundland. The WCBs contributed to the amplification of ridges downstream of each cyclone and to the subsequent elongation of Hanna 's upstream trough into a PV streamer. This streamer eventually triggered the Mediterranean cyclogenesis. The second major effect of the diabatic processes occurred on smaller scales, in the low and middle troposphere. The remnants of Hanna 's tropical PV core advected moist air towards the baroclinic zone leading to condensational PV production in the lower troposphere. In contrast, in the case of the extratropical cyclone, diabatic PV production occurred within its WCB at mid levels. These diagnostic analyses corroborate the potential of diabatic processes associated with extratropical flow systems for the modification of both the low‐level vortices and the upper‐level Rossby wave guide. Copyright © 2011 Royal Meteorological Society |
format |
Article in Journal/Newspaper |
author |
Grams, Christian M. Wernli, Heini Böttcher, Maxi Čampa, Jana Corsmeier, Ulrich Jones, Sarah C. Keller, Julia H. Lenz, Claus‐Jürgen Wiegand, Lars |
spellingShingle |
Grams, Christian M. Wernli, Heini Böttcher, Maxi Čampa, Jana Corsmeier, Ulrich Jones, Sarah C. Keller, Julia H. Lenz, Claus‐Jürgen Wiegand, Lars The key role of diabatic processes in modifying the upper‐tropospheric wave guide: a North Atlantic case‐study |
author_facet |
Grams, Christian M. Wernli, Heini Böttcher, Maxi Čampa, Jana Corsmeier, Ulrich Jones, Sarah C. Keller, Julia H. Lenz, Claus‐Jürgen Wiegand, Lars |
author_sort |
Grams, Christian M. |
title |
The key role of diabatic processes in modifying the upper‐tropospheric wave guide: a North Atlantic case‐study |
title_short |
The key role of diabatic processes in modifying the upper‐tropospheric wave guide: a North Atlantic case‐study |
title_full |
The key role of diabatic processes in modifying the upper‐tropospheric wave guide: a North Atlantic case‐study |
title_fullStr |
The key role of diabatic processes in modifying the upper‐tropospheric wave guide: a North Atlantic case‐study |
title_full_unstemmed |
The key role of diabatic processes in modifying the upper‐tropospheric wave guide: a North Atlantic case‐study |
title_sort |
key role of diabatic processes in modifying the upper‐tropospheric wave guide: a north atlantic case‐study |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1002/qj.891 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.891 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.891 |
genre |
Newfoundland North Atlantic |
genre_facet |
Newfoundland North Atlantic |
op_source |
Quarterly Journal of the Royal Meteorological Society volume 137, issue 661, page 2174-2193 ISSN 0035-9009 1477-870X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/qj.891 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
137 |
container_issue |
661 |
container_start_page |
2174 |
op_container_end_page |
2193 |
_version_ |
1809923271368376320 |