The intensification of thermal extremes in west Africa
J. Ringard
,
Bastien Dieppois
(1)
,
Sandra Rome
(2, 3)
,
A. Diedhiou
(4)
,
T. Pellarin
(4)
,
A. Konare
(5)
,
A. Diawara
,
D. Konaté
,
B. Dje
,
G.L. Katiellou
,
I. Seidou Sanda
,
B. Hassane
(6)
,
T. Vischel
(2)
,
G.F. Garuma
,
G. Mengistu
(7)
,
M. Camara
(8)
,
A. Diongue
,
A. Gaye
(9)
,
L. Descroix
(4)
1
M2C -
Morphodynamique Continentale et Côtière
2 UGA [2016-2019] - Université Grenoble Alpes [2016-2019]
3 IGE - Institut des Géosciences de l’Environnement
4 LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
5 Laboratoire de Physique de l'Atmosphère
6 Département des Sciences de la Terre
7 AAU - Addis Ababa University
8 Department of Physics [Ziguinchor]
9 LPAO-SF - Laboratoire de Physique de l'Atmosphère et de l'Océan Siméon Fongang
2 UGA [2016-2019] - Université Grenoble Alpes [2016-2019]
3 IGE - Institut des Géosciences de l’Environnement
4 LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
5 Laboratoire de Physique de l'Atmosphère
6 Département des Sciences de la Terre
7 AAU - Addis Ababa University
8 Department of Physics [Ziguinchor]
9 LPAO-SF - Laboratoire de Physique de l'Atmosphère et de l'Océan Siméon Fongang
J. Ringard
- Fonction : Auteur
Sandra Rome
- Fonction : Auteur
- PersonId : 1855
- IdHAL : sandra-rome
- ORCID : 0000-0002-8036-6875
- IdRef : 163978530
A. Diawara
- Fonction : Auteur
D. Konaté
- Fonction : Auteur
B. Dje
- Fonction : Auteur
G.L. Katiellou
- Fonction : Auteur
I. Seidou Sanda
- Fonction : Auteur
G.F. Garuma
- Fonction : Auteur
A. Diongue
- Fonction : Auteur
Résumé
This study aims in filling the gap in understanding the relationship between trend and extreme in diurnal and nocturnal temperatures (Tx and Tn) over the Gulf of Guinea area and the Sahel. Time-evolution and trend of Tx and Tn anomalies, extreme temperatures and heat waves are examined using regional and station-based indices over the 1900-2012 and 1950-2012 periods respectively. In investigating extreme temperature anomalies and heat waves, a percentile method is used. At the regional and local scales, rising trends in Tx and Tn anomalies, which appear more pronounced over the past 60 years, are identified over the two regions. The trends are characterized by an intensification of: i) nocturnal/Tn warming over the second half of the 20th century; and ii) diur-nal/Tx warming over the post-1980s. This is the same scheme with extreme warm days and warm nights. Finally annual number of diurnal and nocturnal heat waves has increase over the Gulf of Guinea coastal regions over the second half of the 20th century, and even more substantially over the post-1980s period. Although this trend in extreme warm days and nights is always overestimated in the simulations, from the Coupled Model Intercompar-ison Project Phase 5 (CMIP5), those models display rising trends whatever the scenario, which are likely to be more and more pronounced over the two regions in the next 50 years.
Format du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
The intensification of thermal extremes in west Africa
|
Résumé |
en
This study aims in filling the gap in understanding the relationship between trend and extreme in diurnal and nocturnal temperatures (Tx and Tn) over the Gulf of Guinea area and the Sahel. Time-evolution and trend of Tx and Tn anomalies, extreme temperatures and heat waves are examined using regional and station-based indices over the 1900-2012 and 1950-2012 periods respectively. In investigating extreme temperature anomalies and heat waves, a percentile method is used. At the regional and local scales, rising trends in Tx and Tn anomalies, which appear more pronounced over the past 60 years, are identified over the two regions. The trends are characterized by an intensification of: i) nocturnal/Tn warming over the second half of the 20th century; and ii) diur-nal/Tx warming over the post-1980s. This is the same scheme with extreme warm days and warm nights. Finally annual number of diurnal and nocturnal heat waves has increase over the Gulf of Guinea coastal regions over the second half of the 20th century, and even more substantially over the post-1980s period. Although this trend in extreme warm days and nights is always overestimated in the simulations, from the Coupled Model Intercompar-ison Project Phase 5 (CMIP5), those models display rising trends whatever the scenario, which are likely to be more and more pronounced over the two regions in the next 50 years.
|
Auteur(s) |
J. Ringard
, Bastien Dieppois
1
, Sandra Rome
2, 3
, A. Diedhiou
4
, T. Pellarin
4
, A. Konare
5
, A. Diawara
, D. Konaté
, B. Dje
, G.L. Katiellou
, I. Seidou Sanda
, B. Hassane
6
, T. Vischel
2
, G.F. Garuma
, G. Mengistu
7
, M. Camara
8
, A. Diongue
, A. Gaye
9
, L. Descroix
4
1
M2C -
Morphodynamique Continentale et Côtière
( 847 )
- 24 rue des Tilleuls 14000 Caen
- France
2
UGA [2016-2019] -
Université Grenoble Alpes [2016-2019]
( 445543 )
- 38058 Grenoble cedex
- France
3
IGE -
Institut des Géosciences de l’Environnement
( 501207 )
- UGA - IGE
CS 40700
38 058 Grenoble Cedex 9
- France
4
LTHE -
Laboratoire d'étude des transferts en hydrologie et environnement
( 1051958 )
- ENSHMG - Domaine Universitaire 1023-1025 Rue de la piscine - BP 53 38041 GRENOBLE CEDEX 9f
- France
5
Laboratoire de Physique de l'Atmosphère
( 76439 )
- Côte d’Ivoire
6
Département des Sciences de la Terre
( 245016 )
- Niger
7
AAU -
Addis Ababa University
( 313390 )
- Éthiopie
8
Department of Physics [Ziguinchor]
( 111498 )
- Ziguinchor
- Sénégal
9
LPAO-SF -
Laboratoire de Physique de l'Atmosphère et de l'Océan Siméon Fongang
( 104853 )
- Ecole Supérieure Polytechnique de Dakar
- Sénégal
|
Langue du document |
Anglais
|
Nom de la revue |
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Date de publication |
2016-04
|
Date de publication électronique |
2015-12-19
|
Volume |
139
|
Page/Identifiant |
66-77
|
URL éditeur |
http://www.sciencedirect.com/science/article/pii/S0921818115301624
|
Projet(s) ANR |
|
Domaine(s) |
|
Mots-clés |
en
CMIP5, West Africa, Trend, Daily temperature anomalies, Extreme temperature, Heat waves
|
DOI | 10.1016/j.gloplacha.2015.12.009 |
Base Horizon | fdi:010066806 |
Origine :
Fichiers produits par l'(les) auteur(s)
Loading...