The role of Rossby wave breakings in the climate variability at midlatitudes
This thesis aims at analyzing the dynamics of the interaction between baroclinic waves (stormtrack) and the atmospheric low-frequency variability at midlatitudes. Two different approaches have been followed to study the impact of baroclinic wave breakings on jet-streams, one using reanalysis data an...
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Other Authors: | , , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2012
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Subjects: | |
Online Access: | https://theses.hal.science/tel-04282309 https://theses.hal.science/tel-04282309/document https://theses.hal.science/tel-04282309/file/Michel.pdf |
id |
ftmeteofrance:oai:HAL:tel-04282309v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Météo-France: HAL |
op_collection_id |
ftmeteofrance |
language |
French |
topic |
Dynamic meteorology Rossby wvave breaking Weather regimes Blocking Storm track SST fronts Météorologie dynamique Déferlements d'ondes de Rossby Régimes de temps Blocage Rail des dépressions Fronts de SST [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Dynamic meteorology Rossby wvave breaking Weather regimes Blocking Storm track SST fronts Météorologie dynamique Déferlements d'ondes de Rossby Régimes de temps Blocage Rail des dépressions Fronts de SST [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Michel, Clio The role of Rossby wave breakings in the climate variability at midlatitudes |
topic_facet |
Dynamic meteorology Rossby wvave breaking Weather regimes Blocking Storm track SST fronts Météorologie dynamique Déferlements d'ondes de Rossby Régimes de temps Blocage Rail des dépressions Fronts de SST [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
This thesis aims at analyzing the dynamics of the interaction between baroclinic waves (stormtrack) and the atmospheric low-frequency variability at midlatitudes. Two different approaches have been followed to study the impact of baroclinic wave breakings on jet-streams, one using reanalysis data and the other numerical simulations of a climate model. The first part of the PhD dealt with the link between Rossby wave breakings and the four weather regimes over the North Atlantic in winter using ERA40 reanalysis. The calculation of wave breaking frequencies showed that wave breakings tend to reinforce weather regimes except the Scandinavian blocking which is destroyed by cyclonic wave breaking south of Greenland. Then, precursors of weather regime transitions have been identified. The first precursor is linked to the linear propagation of low-frequency anomalies (period greater than ten days). This is not a systematic precursor but it occurs during the zonal to blocking transition about one week before this latter and is related to a quasi-stationary wave train excited by convective anomalies in the North Atlantic subtropics. The systematic second precursor is related to non-linear transient eddy interactions and has been linked to Rossby wave breakings. The link between the surface cyclones, Rossby wave breakings and the formation and decay of the Scandinavian blocking has been more precisely studied through the preferential transitions from the zonal weather regime to the blocking and from the blocking to the Greenland anticyclone. During the formation and decay of the blocking, surface cyclones reach the same intensities but do not follow the same trajectories. During the blocking formation, surface cyclones follow straight trajectories toward the north of Scandinavia and are linked to an anticyclonic wave breaking. Whereas during the blocking decay, surface cyclones trajectories are curved over the North Atlantic toward Greenland and are linked to a cyclonic wave breaking favouring the Greenland anticyclone ... |
author2 |
Centre national de recherches météorologiques (CNRM) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Institut National Polytechnique de Toulouse - INPT Gwendal Rivière Laurent Terray |
format |
Doctoral or Postdoctoral Thesis |
author |
Michel, Clio |
author_facet |
Michel, Clio |
author_sort |
Michel, Clio |
title |
The role of Rossby wave breakings in the climate variability at midlatitudes |
title_short |
The role of Rossby wave breakings in the climate variability at midlatitudes |
title_full |
The role of Rossby wave breakings in the climate variability at midlatitudes |
title_fullStr |
The role of Rossby wave breakings in the climate variability at midlatitudes |
title_full_unstemmed |
The role of Rossby wave breakings in the climate variability at midlatitudes |
title_sort |
role of rossby wave breakings in the climate variability at midlatitudes |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://theses.hal.science/tel-04282309 https://theses.hal.science/tel-04282309/document https://theses.hal.science/tel-04282309/file/Michel.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_source |
https://theses.hal.science/tel-04282309 Océan, Atmosphère. Institut National Polytechnique de Toulouse - INPT, 2012. Français. ⟨NNT : 2012INPT0091⟩ |
op_relation |
NNT: 2012INPT0091 tel-04282309 https://theses.hal.science/tel-04282309 https://theses.hal.science/tel-04282309/document https://theses.hal.science/tel-04282309/file/Michel.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1809912038879657984 |
spelling |
ftmeteofrance:oai:HAL:tel-04282309v1 2024-09-09T19:42:47+00:00 The role of Rossby wave breakings in the climate variability at midlatitudes Rôle du déferlement des ondes de Rossby dans la variabilité climatique aux latitudes tempérées Michel, Clio Centre national de recherches météorologiques (CNRM) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Institut National Polytechnique de Toulouse - INPT Gwendal Rivière Laurent Terray 2012-10-26 https://theses.hal.science/tel-04282309 https://theses.hal.science/tel-04282309/document https://theses.hal.science/tel-04282309/file/Michel.pdf fr fre HAL CCSD NNT: 2012INPT0091 tel-04282309 https://theses.hal.science/tel-04282309 https://theses.hal.science/tel-04282309/document https://theses.hal.science/tel-04282309/file/Michel.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-04282309 Océan, Atmosphère. Institut National Polytechnique de Toulouse - INPT, 2012. Français. ⟨NNT : 2012INPT0091⟩ Dynamic meteorology Rossby wvave breaking Weather regimes Blocking Storm track SST fronts Météorologie dynamique Déferlements d'ondes de Rossby Régimes de temps Blocage Rail des dépressions Fronts de SST [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/doctoralThesis Theses 2012 ftmeteofrance 2024-06-25T00:04:54Z This thesis aims at analyzing the dynamics of the interaction between baroclinic waves (stormtrack) and the atmospheric low-frequency variability at midlatitudes. Two different approaches have been followed to study the impact of baroclinic wave breakings on jet-streams, one using reanalysis data and the other numerical simulations of a climate model. The first part of the PhD dealt with the link between Rossby wave breakings and the four weather regimes over the North Atlantic in winter using ERA40 reanalysis. The calculation of wave breaking frequencies showed that wave breakings tend to reinforce weather regimes except the Scandinavian blocking which is destroyed by cyclonic wave breaking south of Greenland. Then, precursors of weather regime transitions have been identified. The first precursor is linked to the linear propagation of low-frequency anomalies (period greater than ten days). This is not a systematic precursor but it occurs during the zonal to blocking transition about one week before this latter and is related to a quasi-stationary wave train excited by convective anomalies in the North Atlantic subtropics. The systematic second precursor is related to non-linear transient eddy interactions and has been linked to Rossby wave breakings. The link between the surface cyclones, Rossby wave breakings and the formation and decay of the Scandinavian blocking has been more precisely studied through the preferential transitions from the zonal weather regime to the blocking and from the blocking to the Greenland anticyclone. During the formation and decay of the blocking, surface cyclones reach the same intensities but do not follow the same trajectories. During the blocking formation, surface cyclones follow straight trajectories toward the north of Scandinavia and are linked to an anticyclonic wave breaking. Whereas during the blocking decay, surface cyclones trajectories are curved over the North Atlantic toward Greenland and are linked to a cyclonic wave breaking favouring the Greenland anticyclone ... Doctoral or Postdoctoral Thesis Greenland North Atlantic Météo-France: HAL Greenland |