Decadal Variability of Rainfall in Senegal: Beyond the Total Seasonal Amount
International audience Abstract Rainfall characteristics are crucial in monsoon regions, in particular for agriculture. Crop yields indeed depend on the rainfall seasonal amounts, but also on other rainfall characteristics such as the onset of the rainy season or the distribution of rainy days. In t...
Published in: | Journal of Climate |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2022
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Online Access: | https://hal.science/hal-03815312 https://doi.org/10.1175/JCLI-D-21-0699.1 |
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Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
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language |
English |
topic |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Badji, Aïssatou Mohino, Elsa Diakhaté, Moussa Mignot, Juliette Gaye, Amadou Thierno Decadal Variability of Rainfall in Senegal: Beyond the Total Seasonal Amount |
topic_facet |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
International audience Abstract Rainfall characteristics are crucial in monsoon regions, in particular for agriculture. Crop yields indeed depend on the rainfall seasonal amounts, but also on other rainfall characteristics such as the onset of the rainy season or the distribution of rainy days. In the Sahel region, while the average amount of seasonal rainfall has been shown to be marked by strong decadal variability, the modulation of rainfall characteristics has received less attention in the literature so far. In this study, we show that the frequency of light, heavy, and extreme rainfall events and the mean intensity of rainfall events in Senegal exhibit a marked decadal variability over the 1918–2000 period, strongly similar to that of the mean seasonal rainfall. The decadal modulations of these events show a strong and positive link with the Atlantic multidecadal variability (AMV). Indeed, positive sea surface temperature anomalies over the North Atlantic and Mediterranean related to a warm AMV phase are associated with negative sea level pressure anomalies over the northern Atlantic and a northward shift of the intertropical convergence zone. We also find that the onset and cessation dates as well as the length of the rainy season show relatively less decadal variability, which is more related to the interdecadal Pacific oscillation (IPO), a positive phase of the latter leading to a late onset, an early cessation, and an overall shorter rainy season in Senegal. |
author2 |
Laboratoire de Physique de l'Atmosphère et de l'Océan Siméon Fongang (LPAO-SF) École Supérieure Polytechnique de Dakar (ESP) Université Cheikh Anta Diop de Dakar Sénégal (UCAD)-Université Cheikh Anta Diop de Dakar Sénégal (UCAD) Département de physique Departament de Física, Universitat Autònoma de Barcelona Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona (UAB) Université Amadou Mahtar Mbow (UAM) Océan et variabilité du climat (VARCLIM) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) |
format |
Article in Journal/Newspaper |
author |
Badji, Aïssatou Mohino, Elsa Diakhaté, Moussa Mignot, Juliette Gaye, Amadou Thierno |
author_facet |
Badji, Aïssatou Mohino, Elsa Diakhaté, Moussa Mignot, Juliette Gaye, Amadou Thierno |
author_sort |
Badji, Aïssatou |
title |
Decadal Variability of Rainfall in Senegal: Beyond the Total Seasonal Amount |
title_short |
Decadal Variability of Rainfall in Senegal: Beyond the Total Seasonal Amount |
title_full |
Decadal Variability of Rainfall in Senegal: Beyond the Total Seasonal Amount |
title_fullStr |
Decadal Variability of Rainfall in Senegal: Beyond the Total Seasonal Amount |
title_full_unstemmed |
Decadal Variability of Rainfall in Senegal: Beyond the Total Seasonal Amount |
title_sort |
decadal variability of rainfall in senegal: beyond the total seasonal amount |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03815312 https://doi.org/10.1175/JCLI-D-21-0699.1 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-03815312 Journal of Climate, 2022, 35 (16), pp.5339-5358. ⟨10.1175/JCLI-D-21-0699.1⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1175/JCLI-D-21-0699.1 hal-03815312 https://hal.science/hal-03815312 doi:10.1175/JCLI-D-21-0699.1 IRD: PAR00024777 WOS: 000835668800006 |
op_doi |
https://doi.org/10.1175/JCLI-D-21-0699.1 |
container_title |
Journal of Climate |
container_volume |
35 |
container_issue |
16 |
container_start_page |
5339 |
op_container_end_page |
5358 |
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1799485193482928128 |
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ftuniversailles:oai:HAL:hal-03815312v1 2024-05-19T07:45:13+00:00 Decadal Variability of Rainfall in Senegal: Beyond the Total Seasonal Amount Badji, Aïssatou Mohino, Elsa Diakhaté, Moussa Mignot, Juliette Gaye, Amadou Thierno Laboratoire de Physique de l'Atmosphère et de l'Océan Siméon Fongang (LPAO-SF) École Supérieure Polytechnique de Dakar (ESP) Université Cheikh Anta Diop de Dakar Sénégal (UCAD)-Université Cheikh Anta Diop de Dakar Sénégal (UCAD) Département de physique Departament de Física, Universitat Autònoma de Barcelona Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona (UAB) Université Amadou Mahtar Mbow (UAM) Océan et variabilité du climat (VARCLIM) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) 2022-08-15 https://hal.science/hal-03815312 https://doi.org/10.1175/JCLI-D-21-0699.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JCLI-D-21-0699.1 hal-03815312 https://hal.science/hal-03815312 doi:10.1175/JCLI-D-21-0699.1 IRD: PAR00024777 WOS: 000835668800006 ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-03815312 Journal of Climate, 2022, 35 (16), pp.5339-5358. ⟨10.1175/JCLI-D-21-0699.1⟩ [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/article Journal articles 2022 ftuniversailles https://doi.org/10.1175/JCLI-D-21-0699.1 2024-04-25T00:21:44Z International audience Abstract Rainfall characteristics are crucial in monsoon regions, in particular for agriculture. Crop yields indeed depend on the rainfall seasonal amounts, but also on other rainfall characteristics such as the onset of the rainy season or the distribution of rainy days. In the Sahel region, while the average amount of seasonal rainfall has been shown to be marked by strong decadal variability, the modulation of rainfall characteristics has received less attention in the literature so far. In this study, we show that the frequency of light, heavy, and extreme rainfall events and the mean intensity of rainfall events in Senegal exhibit a marked decadal variability over the 1918–2000 period, strongly similar to that of the mean seasonal rainfall. The decadal modulations of these events show a strong and positive link with the Atlantic multidecadal variability (AMV). Indeed, positive sea surface temperature anomalies over the North Atlantic and Mediterranean related to a warm AMV phase are associated with negative sea level pressure anomalies over the northern Atlantic and a northward shift of the intertropical convergence zone. We also find that the onset and cessation dates as well as the length of the rainy season show relatively less decadal variability, which is more related to the interdecadal Pacific oscillation (IPO), a positive phase of the latter leading to a late onset, an early cessation, and an overall shorter rainy season in Senegal. Article in Journal/Newspaper North Atlantic Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Journal of Climate 35 16 5339 5358 |