Polar lows in the Northern Hemisphere: influence of the large-scale environment, its variability and its changes with climate change
Polar lows (PLs) are intense meso-cyclones forming in winter at hight latitudes over open water. Despite their low spatial and temporal extension, they are particularly dangerous, being associated with strong winds and heavy snowfall, causing very low visibility and high waves. The purpose of this t...
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Language: | French |
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ftsorbonneuniv:oai:HAL:pastel-00932363v1 2024-06-09T07:47:32+00:00 Polar lows in the Northern Hemisphere: influence of the large-scale environment, its variability and its changes with climate change Polar lows dans l'hémisphère Nord : influence de l'environnement de grande échelle, de sa variabilité et de ses modifications avec le changement climatique Mallet, Paul-Etienne Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Ecole Polytechnique X Chantal Claud(chantal.claud@lmd.polytechnique.fr) 2013-06-26 https://pastel.hal.science/pastel-00932363 https://pastel.hal.science/pastel-00932363/document https://pastel.hal.science/pastel-00932363/file/These_PEM_small_.pdf fr fre HAL CCSD pastel-00932363 https://pastel.hal.science/pastel-00932363 https://pastel.hal.science/pastel-00932363/document https://pastel.hal.science/pastel-00932363/file/These_PEM_small_.pdf info:eu-repo/semantics/OpenAccess https://pastel.hal.science/pastel-00932363 Climatologie. Ecole Polytechnique X, 2013. Français. ⟨NNT : ⟩ extreme events climate change polar lows événements extrêmes changement climatique [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/doctoralThesis Theses 2013 ftsorbonneuniv 2024-05-16T23:50:01Z Polar lows (PLs) are intense meso-cyclones forming in winter at hight latitudes over open water. Despite their low spatial and temporal extension, they are particularly dangerous, being associated with strong winds and heavy snowfall, causing very low visibility and high waves. The purpose of this thesis is to study the impact of climate variability on their outbreak, and in particular to make an assessment of their evolution with climate change. Firsly, large-scale environment leading to development of Pls is determined using all available homogeneous PLs observations. Geopotential height at 500 hPa, the temperature difference between the surface of the ocean and 500 hPa, wind and temperature near the surface, and the potential vorticity (PV) at 300 hPa present significant anomaly patterns over large areas centrerd over PL genesis zones. The focus is done on the Nordic Seas for which there is a wide and homogeneous climatology of Pls, although other regions of the Northern Hemisphere are also studied (Labrador Sea, Gulf of Alaska .). Pls develop after a certain build-up, the outbreak day been marked by strong wind and PV intensification. Significant disparities between the different formation areas indicate some heterogeneity in the relative influence of formation mechanisms. A second part is devoted to study the influence of climate variability on Pls. Two approaches to this variability are then considered: the teleconnection patterns over the North Pacific and weather regimes over the North Atlantic and Europe. Teleconnection patterns based on the idea that the atmospheric variability can be described by variations in the intensity of specific large-scale, persistent and recurrent patterns. For each North Pacific area, the study of the relationship between these patterns and key variables for Pls formation highlight respective influences of each teleconnection patterns on Pls development. The idea behind the concept of weather regimes is that the atmospheric circulation variability can be described as an ... Doctoral or Postdoctoral Thesis Labrador Sea Nordic Seas North Atlantic Alaska HAL Sorbonne Université Gulf of Alaska Pacific |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
French |
topic |
extreme events climate change polar lows événements extrêmes changement climatique [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
extreme events climate change polar lows événements extrêmes changement climatique [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes Mallet, Paul-Etienne Polar lows in the Northern Hemisphere: influence of the large-scale environment, its variability and its changes with climate change |
topic_facet |
extreme events climate change polar lows événements extrêmes changement climatique [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes |
description |
Polar lows (PLs) are intense meso-cyclones forming in winter at hight latitudes over open water. Despite their low spatial and temporal extension, they are particularly dangerous, being associated with strong winds and heavy snowfall, causing very low visibility and high waves. The purpose of this thesis is to study the impact of climate variability on their outbreak, and in particular to make an assessment of their evolution with climate change. Firsly, large-scale environment leading to development of Pls is determined using all available homogeneous PLs observations. Geopotential height at 500 hPa, the temperature difference between the surface of the ocean and 500 hPa, wind and temperature near the surface, and the potential vorticity (PV) at 300 hPa present significant anomaly patterns over large areas centrerd over PL genesis zones. The focus is done on the Nordic Seas for which there is a wide and homogeneous climatology of Pls, although other regions of the Northern Hemisphere are also studied (Labrador Sea, Gulf of Alaska .). Pls develop after a certain build-up, the outbreak day been marked by strong wind and PV intensification. Significant disparities between the different formation areas indicate some heterogeneity in the relative influence of formation mechanisms. A second part is devoted to study the influence of climate variability on Pls. Two approaches to this variability are then considered: the teleconnection patterns over the North Pacific and weather regimes over the North Atlantic and Europe. Teleconnection patterns based on the idea that the atmospheric variability can be described by variations in the intensity of specific large-scale, persistent and recurrent patterns. For each North Pacific area, the study of the relationship between these patterns and key variables for Pls formation highlight respective influences of each teleconnection patterns on Pls development. The idea behind the concept of weather regimes is that the atmospheric circulation variability can be described as an ... |
author2 |
Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Ecole Polytechnique X Chantal Claud(chantal.claud@lmd.polytechnique.fr) |
format |
Doctoral or Postdoctoral Thesis |
author |
Mallet, Paul-Etienne |
author_facet |
Mallet, Paul-Etienne |
author_sort |
Mallet, Paul-Etienne |
title |
Polar lows in the Northern Hemisphere: influence of the large-scale environment, its variability and its changes with climate change |
title_short |
Polar lows in the Northern Hemisphere: influence of the large-scale environment, its variability and its changes with climate change |
title_full |
Polar lows in the Northern Hemisphere: influence of the large-scale environment, its variability and its changes with climate change |
title_fullStr |
Polar lows in the Northern Hemisphere: influence of the large-scale environment, its variability and its changes with climate change |
title_full_unstemmed |
Polar lows in the Northern Hemisphere: influence of the large-scale environment, its variability and its changes with climate change |
title_sort |
polar lows in the northern hemisphere: influence of the large-scale environment, its variability and its changes with climate change |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://pastel.hal.science/pastel-00932363 https://pastel.hal.science/pastel-00932363/document https://pastel.hal.science/pastel-00932363/file/These_PEM_small_.pdf |
geographic |
Gulf of Alaska Pacific |
geographic_facet |
Gulf of Alaska Pacific |
genre |
Labrador Sea Nordic Seas North Atlantic Alaska |
genre_facet |
Labrador Sea Nordic Seas North Atlantic Alaska |
op_source |
https://pastel.hal.science/pastel-00932363 Climatologie. Ecole Polytechnique X, 2013. Français. ⟨NNT : ⟩ |
op_relation |
pastel-00932363 https://pastel.hal.science/pastel-00932363 https://pastel.hal.science/pastel-00932363/document https://pastel.hal.science/pastel-00932363/file/These_PEM_small_.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1801378652122775552 |