Organization of convective ascents in a warm conveyor belt
International audience Warm conveyor belts (WCBs) are warm, moist airstreams of extratropical cyclones leading to widespread clouds and heavy precipitation, where associated diabatic processes can influence midlatitude dynamics. Although WCBs are traditionally seen as continuous slantwise ascents, r...
Published in: | Weather and Climate Dynamics |
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Main Authors: | , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Online Access: | https://hal.archives-ouvertes.fr/hal-02983186 https://hal.archives-ouvertes.fr/hal-02983186/document https://hal.archives-ouvertes.fr/hal-02983186/file/wcd-1-617-2020.pdf https://doi.org/10.5194/wcd-1-617-2020 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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English |
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[SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology |
spellingShingle |
[SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology Blanchard, Nicolas Pantillon, Florian Chaboureau, Jean-Pierre Delanoë, Julien Organization of convective ascents in a warm conveyor belt |
topic_facet |
[SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology |
description |
International audience Warm conveyor belts (WCBs) are warm, moist airstreams of extratropical cyclones leading to widespread clouds and heavy precipitation, where associated diabatic processes can influence midlatitude dynamics. Although WCBs are traditionally seen as continuous slantwise ascents, recent studies have emphasized the presence of embedded convection, the impact of which on large-scale dynamics is still debated. Here, detailed cloud and wind measurements obtained with airborne Doppler radar provide unique infor- mation on the WCB of the Stalactite cyclone on 2 Octo- ber 2016 during the North Atlantic Waveguide and Down- stream Impact Experiment. The measurements are comple- mented by a convection-permitting simulation, enabling on- line Lagrangian trajectories and 3-D objects clustering. Tra- jectories rising by 150 hPa during a relatively short 12 h win- dow are identified as ascents and examined in the WCB re- gion. One-third take an anticyclonic turn at upper levels, while two-thirds follow the cyclonic flow at lower levels. Identified trajectories that reach a 100 hPa (2 h)−1 threshold are further categorized as fast ascents. They represent one- third of the ascents and are located at lower levels mainly. Both radar observations and simulation reveal the presence of convective updrafts in the WCB region, which are char- acterized by moderate reflectivity values up to 20 dBZ. Fast ascents and updraft objects with vertical velocities above 0.3 m s−1 consistently show three main types of convection in the WCB region: (i) frontal convection along the sur- face cold front and the western edge of the low-level jet, (ii) banded convection at about 2 km altitude along the east- ern edge of the low-level jet, and (iii) mid-level convection below the upper-level jet. Frontal and banded convection result in shallow ascents, while mid-level convection con- tributes to the anticyclonic WCB outflow. The results emphasize that convection embedded in WCBs occurs in a coherent and organized manner rather than ... |
author2 |
Laboratoire d'aérologie (LAERO) Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées SPACE - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) |
format |
Article in Journal/Newspaper |
author |
Blanchard, Nicolas Pantillon, Florian Chaboureau, Jean-Pierre Delanoë, Julien |
author_facet |
Blanchard, Nicolas Pantillon, Florian Chaboureau, Jean-Pierre Delanoë, Julien |
author_sort |
Blanchard, Nicolas |
title |
Organization of convective ascents in a warm conveyor belt |
title_short |
Organization of convective ascents in a warm conveyor belt |
title_full |
Organization of convective ascents in a warm conveyor belt |
title_fullStr |
Organization of convective ascents in a warm conveyor belt |
title_full_unstemmed |
Organization of convective ascents in a warm conveyor belt |
title_sort |
organization of convective ascents in a warm conveyor belt |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.archives-ouvertes.fr/hal-02983186 https://hal.archives-ouvertes.fr/hal-02983186/document https://hal.archives-ouvertes.fr/hal-02983186/file/wcd-1-617-2020.pdf https://doi.org/10.5194/wcd-1-617-2020 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 2698-4016 Weather and Climate Dynamics https://hal.archives-ouvertes.fr/hal-02983186 Weather and Climate Dynamics, Copernicus, 2020, 1 (2), pp.617-634. ⟨10.5194/wcd-1-617-2020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/wcd-1-617-2020 hal-02983186 https://hal.archives-ouvertes.fr/hal-02983186 https://hal.archives-ouvertes.fr/hal-02983186/document https://hal.archives-ouvertes.fr/hal-02983186/file/wcd-1-617-2020.pdf doi:10.5194/wcd-1-617-2020 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/wcd-1-617-2020 |
container_title |
Weather and Climate Dynamics |
container_volume |
1 |
container_issue |
2 |
container_start_page |
617 |
op_container_end_page |
634 |
_version_ |
1766135408701210624 |
spelling |
ftccsdartic:oai:HAL:hal-02983186v1 2023-05-15T17:36:03+02:00 Organization of convective ascents in a warm conveyor belt Blanchard, Nicolas Pantillon, Florian Chaboureau, Jean-Pierre Delanoë, Julien Laboratoire d'aérologie (LAERO) Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées SPACE - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) 2020-10-20 https://hal.archives-ouvertes.fr/hal-02983186 https://hal.archives-ouvertes.fr/hal-02983186/document https://hal.archives-ouvertes.fr/hal-02983186/file/wcd-1-617-2020.pdf https://doi.org/10.5194/wcd-1-617-2020 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/wcd-1-617-2020 hal-02983186 https://hal.archives-ouvertes.fr/hal-02983186 https://hal.archives-ouvertes.fr/hal-02983186/document https://hal.archives-ouvertes.fr/hal-02983186/file/wcd-1-617-2020.pdf doi:10.5194/wcd-1-617-2020 info:eu-repo/semantics/OpenAccess ISSN: 2698-4016 Weather and Climate Dynamics https://hal.archives-ouvertes.fr/hal-02983186 Weather and Climate Dynamics, Copernicus, 2020, 1 (2), pp.617-634. ⟨10.5194/wcd-1-617-2020⟩ [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.5194/wcd-1-617-2020 2021-12-25T23:38:32Z International audience Warm conveyor belts (WCBs) are warm, moist airstreams of extratropical cyclones leading to widespread clouds and heavy precipitation, where associated diabatic processes can influence midlatitude dynamics. Although WCBs are traditionally seen as continuous slantwise ascents, recent studies have emphasized the presence of embedded convection, the impact of which on large-scale dynamics is still debated. Here, detailed cloud and wind measurements obtained with airborne Doppler radar provide unique infor- mation on the WCB of the Stalactite cyclone on 2 Octo- ber 2016 during the North Atlantic Waveguide and Down- stream Impact Experiment. The measurements are comple- mented by a convection-permitting simulation, enabling on- line Lagrangian trajectories and 3-D objects clustering. Tra- jectories rising by 150 hPa during a relatively short 12 h win- dow are identified as ascents and examined in the WCB re- gion. One-third take an anticyclonic turn at upper levels, while two-thirds follow the cyclonic flow at lower levels. Identified trajectories that reach a 100 hPa (2 h)−1 threshold are further categorized as fast ascents. They represent one- third of the ascents and are located at lower levels mainly. Both radar observations and simulation reveal the presence of convective updrafts in the WCB region, which are char- acterized by moderate reflectivity values up to 20 dBZ. Fast ascents and updraft objects with vertical velocities above 0.3 m s−1 consistently show three main types of convection in the WCB region: (i) frontal convection along the sur- face cold front and the western edge of the low-level jet, (ii) banded convection at about 2 km altitude along the east- ern edge of the low-level jet, and (iii) mid-level convection below the upper-level jet. Frontal and banded convection result in shallow ascents, while mid-level convection con- tributes to the anticyclonic WCB outflow. The results emphasize that convection embedded in WCBs occurs in a coherent and organized manner rather than ... Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Weather and Climate Dynamics 1 2 617 634 |