On the coupling between polar and tropical regions during springtime: variability of tropical intrusion and Frozen In Anticyclones
International audience Recent observational and modeling transport studies of Arctic stratospheric final warming have shown that tropical/subtropical air masses can be transported to high latitudes and remain confined within a long-lived “frozen- in” anticyclone (FriaC), embedded in the summer easte...
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2015
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Online Access: | https://insu.hal.science/insu-01183236 |
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openpolar |
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Open Polar |
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HAL Sorbonne Université |
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ftsorbonneuniv |
language |
English |
topic |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
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[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Huret, Nathalie Thiéblemont, Rémi Hauchecorne, Alain Orsolini, Yvan J. Matthes, K. On the coupling between polar and tropical regions during springtime: variability of tropical intrusion and Frozen In Anticyclones |
topic_facet |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
International audience Recent observational and modeling transport studies of Arctic stratospheric final warming have shown that tropical/subtropical air masses can be transported to high latitudes and remain confined within a long-lived “frozen- in” anticyclone (FriaC), embedded in the summer easterlies for several months.We first present a climatology of these sporadic events over the period 1960-2011 using era-40 and era interim reanalyses. this study highlights stratospheric favorable preconditioning for FrIACs occurrence, that is: i) early and abrupt final warming, ii) no stratospheric major warming during the previous winter, and iii) east phase of the Quasi-Biennial Oscillation. We will present in detail the FriaC in spring 2011, which was the largest ever recorded. Our climatology further suggests that the frequency of occurrence of FriaCs has increased over the last decade (among the nine cases detected over the period 1960- 2011, five occurred between 2002 and 2011).A chemistry climate model is then used for the first time to investigate FriaCs characteristics and variability. simulations were performed with the nCar’s Community earth system Model (CesM, version 1.0.2), a coupled model system including the Whole Atmosphere Community Climate Model (WACCM). FrIACs characteristics (i.e. spatial extent and duration), are overall consistent by comparing with FriaCs detected era-40 meteorological reanalyses. Dynamical analysis reveals that FriaCs are associated with an abrupt and early winter-to-summer stratospheric circulation transition, characterized by an amplification of planetary wave activity. Furthermore, our model results confirm that FrIACs occur preferentially under the easterly phase of the QBO and in absence of MSW during the preceding winter. Finally, we notice that extreme climate change conditions (RCP8.5 scenario) do not influence FriaCs frequency. |
author2 |
Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E) Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES) Helmholtz Centre for Ocean Research Kiel (GEOMAR) STRATO - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Norwegian Institute for Air Research (NILU) |
format |
Conference Object |
author |
Huret, Nathalie Thiéblemont, Rémi Hauchecorne, Alain Orsolini, Yvan J. Matthes, K. |
author_facet |
Huret, Nathalie Thiéblemont, Rémi Hauchecorne, Alain Orsolini, Yvan J. Matthes, K. |
author_sort |
Huret, Nathalie |
title |
On the coupling between polar and tropical regions during springtime: variability of tropical intrusion and Frozen In Anticyclones |
title_short |
On the coupling between polar and tropical regions during springtime: variability of tropical intrusion and Frozen In Anticyclones |
title_full |
On the coupling between polar and tropical regions during springtime: variability of tropical intrusion and Frozen In Anticyclones |
title_fullStr |
On the coupling between polar and tropical regions during springtime: variability of tropical intrusion and Frozen In Anticyclones |
title_full_unstemmed |
On the coupling between polar and tropical regions during springtime: variability of tropical intrusion and Frozen In Anticyclones |
title_sort |
on the coupling between polar and tropical regions during springtime: variability of tropical intrusion and frozen in anticyclones |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://insu.hal.science/insu-01183236 |
op_coverage |
Paris, France |
genre |
Arctic Climate change |
genre_facet |
Arctic Climate change |
op_source |
Our Common Future Under Climate Change, International Scientific Coference https://insu.hal.science/insu-01183236 Our Common Future Under Climate Change, International Scientific Coference, Jul 2015, Paris, France. , pp.P-1108-04, 2015 http://www.commonfuture-paris2015.org |
op_relation |
insu-01183236 https://insu.hal.science/insu-01183236 |
_version_ |
1799475789326974976 |
spelling |
ftsorbonneuniv:oai:HAL:insu-01183236v1 2024-05-19T07:36:39+00:00 On the coupling between polar and tropical regions during springtime: variability of tropical intrusion and Frozen In Anticyclones Huret, Nathalie Thiéblemont, Rémi Hauchecorne, Alain Orsolini, Yvan J. Matthes, K. Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E) Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES) Helmholtz Centre for Ocean Research Kiel (GEOMAR) STRATO - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Norwegian Institute for Air Research (NILU) Paris, France 2015-07-07 https://insu.hal.science/insu-01183236 en eng HAL CCSD insu-01183236 https://insu.hal.science/insu-01183236 Our Common Future Under Climate Change, International Scientific Coference https://insu.hal.science/insu-01183236 Our Common Future Under Climate Change, International Scientific Coference, Jul 2015, Paris, France. , pp.P-1108-04, 2015 http://www.commonfuture-paris2015.org [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/conferenceObject Conference poster 2015 ftsorbonneuniv 2024-04-25T04:16:52Z International audience Recent observational and modeling transport studies of Arctic stratospheric final warming have shown that tropical/subtropical air masses can be transported to high latitudes and remain confined within a long-lived “frozen- in” anticyclone (FriaC), embedded in the summer easterlies for several months.We first present a climatology of these sporadic events over the period 1960-2011 using era-40 and era interim reanalyses. this study highlights stratospheric favorable preconditioning for FrIACs occurrence, that is: i) early and abrupt final warming, ii) no stratospheric major warming during the previous winter, and iii) east phase of the Quasi-Biennial Oscillation. We will present in detail the FriaC in spring 2011, which was the largest ever recorded. Our climatology further suggests that the frequency of occurrence of FriaCs has increased over the last decade (among the nine cases detected over the period 1960- 2011, five occurred between 2002 and 2011).A chemistry climate model is then used for the first time to investigate FriaCs characteristics and variability. simulations were performed with the nCar’s Community earth system Model (CesM, version 1.0.2), a coupled model system including the Whole Atmosphere Community Climate Model (WACCM). FrIACs characteristics (i.e. spatial extent and duration), are overall consistent by comparing with FriaCs detected era-40 meteorological reanalyses. Dynamical analysis reveals that FriaCs are associated with an abrupt and early winter-to-summer stratospheric circulation transition, characterized by an amplification of planetary wave activity. Furthermore, our model results confirm that FrIACs occur preferentially under the easterly phase of the QBO and in absence of MSW during the preceding winter. Finally, we notice that extreme climate change conditions (RCP8.5 scenario) do not influence FriaCs frequency. Conference Object Arctic Climate change HAL Sorbonne Université |