Characteristics of African easterly waves associated with tropical cyclogenesis in the Cape Verde Islands region in July-August-September of 2004-2008
International audience The most common synoptic-scale disturbances related to cyclogenesis over the tropical north Atlantic Ocean are African easterly waves (AEWs) that originated from the northern African continent. However, most of these waves do not evolve in tropical depressions, storms, or hurr...
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ftunivnantes:oai:HAL:hal-00996015v1 2023-05-15T17:34:41+02:00 Characteristics of African easterly waves associated with tropical cyclogenesis in the Cape Verde Islands region in July-August-September of 2004-2008 Arnault, Joël Roux, Frank Laboratoire d'aérologie (LAERO) Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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)-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) 2011 https://hal.science/hal-00996015 https://hal.science/hal-00996015/document https://hal.science/hal-00996015/file/Arnaud2010.pdf https://doi.org/10.1016/j.atmosres.2010.12.028 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.atmosres.2010.12.028 hal-00996015 https://hal.science/hal-00996015 https://hal.science/hal-00996015/document https://hal.science/hal-00996015/file/Arnaud2010.pdf doi:10.1016/j.atmosres.2010.12.028 info:eu-repo/semantics/OpenAccess ISSN: 0169-8095 Atmospheric Research https://hal.science/hal-00996015 Atmospheric Research, 2011, 100 (1), pp.61-82. ⟨10.1016/j.atmosres.2010.12.028⟩ Tropical cyclogenesis Cape Verde hurricanes African easterly waves [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/article Journal articles 2011 ftunivnantes https://doi.org/10.1016/j.atmosres.2010.12.028 2023-02-22T04:35:13Z International audience The most common synoptic-scale disturbances related to cyclogenesis over the tropical north Atlantic Ocean are African easterly waves (AEWs) that originated from the northern African continent. However, most of these waves do not evolve in tropical depressions, storms, or hurricanes. The reasons why only few AEWs develop and the necessary conditions for cyclogenetic evolution are still the subject of intense debate. Tropical cyclogenesis occurring near the Cape Verde Islands in the eastern tropical Atlantic is investigated here with five seasons (July-August-September of 2004-2008) of European Centre for Medium-Range Weather Forecasts analyses, Meteosat-9 images, and National Hurricane Center (National Oceanic and Atmospheric Administration, National Centers for Environmental Prediction) "best track" archives. The nine named storms that first reached tropical depression intensity east of 30°W, and two among six which developed between 30 and 40°W, during these five years evolved from intense AEW troughs, associated with low-level cyclonic circulation, weak mid-level anticyclonic Saharan flow to the east, and deep convection near the center of cyclonic vorticity. The cyclogenetic evolution of three AEW troughs, which verified these conditions but failed to develop into named storms, was probably inhibited by unusually dry environment and strong vertical wind shear. The fate of other AEW troughs, which did not satisfy the necessary conditions, is also discussed. Article in Journal/Newspaper North Atlantic Université de Nantes: HAL-UNIV-NANTES Atmospheric Research 100 1 61 82 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Tropical cyclogenesis Cape Verde hurricanes African easterly waves [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
spellingShingle |
Tropical cyclogenesis Cape Verde hurricanes African easterly waves [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Arnault, Joël Roux, Frank Characteristics of African easterly waves associated with tropical cyclogenesis in the Cape Verde Islands region in July-August-September of 2004-2008 |
topic_facet |
Tropical cyclogenesis Cape Verde hurricanes African easterly waves [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
International audience The most common synoptic-scale disturbances related to cyclogenesis over the tropical north Atlantic Ocean are African easterly waves (AEWs) that originated from the northern African continent. However, most of these waves do not evolve in tropical depressions, storms, or hurricanes. The reasons why only few AEWs develop and the necessary conditions for cyclogenetic evolution are still the subject of intense debate. Tropical cyclogenesis occurring near the Cape Verde Islands in the eastern tropical Atlantic is investigated here with five seasons (July-August-September of 2004-2008) of European Centre for Medium-Range Weather Forecasts analyses, Meteosat-9 images, and National Hurricane Center (National Oceanic and Atmospheric Administration, National Centers for Environmental Prediction) "best track" archives. The nine named storms that first reached tropical depression intensity east of 30°W, and two among six which developed between 30 and 40°W, during these five years evolved from intense AEW troughs, associated with low-level cyclonic circulation, weak mid-level anticyclonic Saharan flow to the east, and deep convection near the center of cyclonic vorticity. The cyclogenetic evolution of three AEW troughs, which verified these conditions but failed to develop into named storms, was probably inhibited by unusually dry environment and strong vertical wind shear. The fate of other AEW troughs, which did not satisfy the necessary conditions, is also discussed. |
author2 |
Laboratoire d'aérologie (LAERO) Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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)-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) |
format |
Article in Journal/Newspaper |
author |
Arnault, Joël Roux, Frank |
author_facet |
Arnault, Joël Roux, Frank |
author_sort |
Arnault, Joël |
title |
Characteristics of African easterly waves associated with tropical cyclogenesis in the Cape Verde Islands region in July-August-September of 2004-2008 |
title_short |
Characteristics of African easterly waves associated with tropical cyclogenesis in the Cape Verde Islands region in July-August-September of 2004-2008 |
title_full |
Characteristics of African easterly waves associated with tropical cyclogenesis in the Cape Verde Islands region in July-August-September of 2004-2008 |
title_fullStr |
Characteristics of African easterly waves associated with tropical cyclogenesis in the Cape Verde Islands region in July-August-September of 2004-2008 |
title_full_unstemmed |
Characteristics of African easterly waves associated with tropical cyclogenesis in the Cape Verde Islands region in July-August-September of 2004-2008 |
title_sort |
characteristics of african easterly waves associated with tropical cyclogenesis in the cape verde islands region in july-august-september of 2004-2008 |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/hal-00996015 https://hal.science/hal-00996015/document https://hal.science/hal-00996015/file/Arnaud2010.pdf https://doi.org/10.1016/j.atmosres.2010.12.028 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0169-8095 Atmospheric Research https://hal.science/hal-00996015 Atmospheric Research, 2011, 100 (1), pp.61-82. ⟨10.1016/j.atmosres.2010.12.028⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.atmosres.2010.12.028 hal-00996015 https://hal.science/hal-00996015 https://hal.science/hal-00996015/document https://hal.science/hal-00996015/file/Arnaud2010.pdf doi:10.1016/j.atmosres.2010.12.028 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.atmosres.2010.12.028 |
container_title |
Atmospheric Research |
container_volume |
100 |
container_issue |
1 |
container_start_page |
61 |
op_container_end_page |
82 |
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1766133599513346048 |