A. Ali and T. Lebel, The Sahelian standardized rainfall index revisited, International Journal of Climatology, vol.87, issue.12, pp.1705-1714, 2009.
DOI : 10.1002/joc.1832
URL : https://hal.archives-ouvertes.fr/insu-00411889

D. Andrews, A Robust Method for Multiple Linear Regression, Technometrics, vol.42, issue.4, pp.523-531, 1974.
DOI : 10.1093/biomet/57.1.19

A. Ansari and R. Bradley, Rank-Sum Tests for Dispersions, The Annals of Mathematical Statistics, vol.31, issue.4, pp.1174-1189, 1960.
DOI : 10.1214/aoms/1177705688

O. Ati, C. Stigter, and E. Oladipo, A comparison of methods to determine the onset of the growing season in northern Nigeria, International Journal of Climatology, vol.10, issue.6, 2002.
DOI : 10.1002/joc.712

M. Balme, S. Galle, and T. Lebel, Démarrage de la saison des pluies au Sahel: variabilité aux e ´chelles hydrologique et agronomique, analysée a ` partir des données EPSAT-Niger, Sécheresse, vol.16, issue.1, pp.15-22, 2005.

M. Balme, T. Vischel, T. Lebel, C. Peugeot, and S. Galle, Assessing the water balance in the Sahel: Impact of small scale rainfall variability on runoff, Journal of Hydrology, vol.331, issue.1-2, pp.336-348, 2006.
DOI : 10.1016/j.jhydrol.2006.05.020
URL : https://hal.archives-ouvertes.fr/insu-00385413

J. Barron, J. Rockström, F. Gichuki, and N. Hatibu, Dry spell analysis and maize yields for two semi-arid locations in east Africa, Agricultural and Forest Meteorology, vol.117, issue.1-2, pp.23-37, 2003.
DOI : 10.1016/S0168-1923(03)00037-6

R. Bendel and A. Afifi, Comparison of stopping rules in forward'' stepwise'' regression, J Am Stat Assoc, vol.72, issue.357, pp.46-53, 1977.

M. Biasutti and A. Sobel, Delayed Sahel rainfall and global seasonal cycle in a warmer climate, Geophysical Research Letters, vol.451, issue.7182, pp.10-1029, 2009.
DOI : 10.1029/2009GL041303

P. Brown, M. Vannucci, and T. Fearn, Multivariate Bayesian variable selection and prediction, Journal of the Royal Statistical Society: Series B (Statistical Methodology), vol.60, issue.3, pp.627-641, 1998.
DOI : 10.1111/1467-9868.00144

C. Buser, H. Künsch, and A. Weber, Biases and Uncertainty in Climate Projections, Scandinavian Journal of Statistics, vol.108, issue.2, pp.179-199, 2010.
DOI : 10.1111/j.1467-9469.2009.00686.x

T. Chen and E. Martin, Bayesian linear regression and variable selection for spectroscopic calibration, Analytica Chimica Acta, vol.631, issue.1, pp.13-21, 2009.
DOI : 10.1016/j.aca.2008.10.014

K. Cook and E. Vizy, Coupled Model Simulations of the West African Monsoon System: Twentieth- and Twenty-First-Century Simulations, Journal of Climate, vol.19, issue.15, pp.3681-3703, 2006.
DOI : 10.1175/JCLI3814.1

T. Orgeval, J. Polcher, and L. Li, Uncertainties in modelling future hydrological change over West Africa, Climate Dynamics, vol.125, issue.12, pp.93-108, 2006.
DOI : 10.1007/s00382-005-0079-3

A. Dai, Precipitation Characteristics in Eighteen Coupled Climate Models, Journal of Climate, vol.19, issue.18, pp.4605-4630, 2006.
DOI : 10.1175/JCLI3884.1

D. Wit, M. Stankiewicz, and J. , Changes in Surface Water Supply Across Africa with Predicted Climate Change, Science, vol.311, issue.5769, pp.1917-1921, 2006.
DOI : 10.1126/science.1119929

D. Genio, A. Yao, M. , and J. J. , Will moist convection be stronger in a warmer climate?, Geophys Res Lett, vol.34, issue.16, pp.10-1029, 2007.

M. Déqué, D. Rowell, D. Lüthi, G. F. Christensen, J. Rockel et al., An intercomparison of regional climate simulations for Europe: assessing uncertainties in model projections, Climatic Change, vol.82, issue.C8, pp.53-70, 2007.
DOI : 10.1007/s10584-006-9228-x

I. Diallo, M. Sylla, F. Giorgi, A. Gaye, and M. Camara, Multimodel GCM-RCM ensemble-based projections of temperature and precipitation overWest Africa for the early 21st century, Int J, p.972896, 2012.

M. Diop, A propos de la durée de la saison des pluies au Sénégal, Sécheresse, vol.7, pp.7-15, 1996.

M. Fligner and T. Killeen, Distribution-Free Two-Sample Tests for Scale, Journal of the American Statistical Association, vol.34, issue.353, pp.210-213, 1976.
DOI : 10.1080/01621459.1976.10481517

W. Gilks, Markov chain monte carlo. Encyclopedia of Biostatistics Changes in rainfall regime 1379, 1996.

J. Grandpeix and J. Lafore, A Density Current Parameterization Coupled with Emanuel???s Convection Scheme. Part I: The Models, Journal of the Atmospheric Sciences, vol.67, issue.4, pp.881-897, 2010.
DOI : 10.1175/2009JAS3044.1
URL : https://hal.archives-ouvertes.fr/hal-01116769

M. Hoerling, J. Hurrell, J. Eischeid, and A. Phillips, Detection and Attribution of Twentieth-Century Northern and Southern African Rainfall Change, Journal of Climate, vol.19, issue.16, pp.3989-4008, 2006.
DOI : 10.1175/JCLI3842.1

J. Houghton, G. Jenkins, and J. Ephraums, Climate change, 1990.
DOI : 10.4337/9781781950715.00018

P. Hubert, J. Carbonnel, and A. Chaouche, Segmentation des s??ries hydrom??t??orologiques ??? application ?? des s??ries de pr??cipitations et de d??bits de l'afrique de l'ouest, Journal of Hydrology, vol.110, issue.3-4, pp.349-367, 1989.
DOI : 10.1016/0022-1694(89)90197-2

M. Hulme, Regional climate change scenarios based on IPCC emissions projections with some illustrations for, Africa. Area, vol.26, issue.1, pp.33-44, 1994.

M. Hulme, R. Doherty, T. Ngara, M. New, and D. Lister, African climate change: 1900-2100, Climate Research, vol.17, issue.2, pp.145-168, 2001.
DOI : 10.3354/cr017145

B. Ibrahim, J. Polcher, H. Karambiri, and B. Rockel, Characterization of the rainy season in Burkina Faso and it???s representation by regional climate models, Climate Dynamics, vol.30, issue.189, pp.1287-1302, 2012.
DOI : 10.1007/s00382-011-1276-x

T. Johns, J. Gregory, W. Ingram, C. Johnson, A. Jones et al., Anthropogenic climate change for 1860 to 2100 simulated with the HadCm3 model under updated emissions scenarios, Clim Dyn, vol.20, issue.6, pp.583-612, 2003.

R. Jones, J. Murphy, and M. Noguer, Simulation of climate change over europe using a nested regional-climate model. I: Assessment of control climate, including sensitivity to location of lateral boundaries, Quarterly Journal of the Royal Meteorological Society, vol.5, issue.526, pp.1413-1449, 1995.
DOI : 10.1002/qj.49712152610

H. Karambiri, G. Galiano, S. , G. J. Yacouba, H. et al., Assessing the impact of climate variability and climate change on runoff in West Africa: the case of Senegal and Nakambe River basins, Atmospheric Science Letters, vol.16, issue.8, pp.109-115317, 2011.
DOI : 10.1002/asl.317
URL : https://hal.archives-ouvertes.fr/hal-01117329

E. Kjellström, G. Nikulin, U. Hansson, G. Strandberg, and A. Ullerstig, 21st century changes in the European climate: uncertainties derived from an ensemble of regional climate model simulations, Tellus A, vol.6, issue.8, pp.24-40, 2011.
DOI : 10.1111/j.1600-0870.2010.00475.x

S. Kotlarski, F. Paul, and D. Jacob, Forcing a Distributed Glacier Mass Balance Model with the Regional Climate Model REMO. Part I: Climate Model Evaluation, Journal of Climate, vol.23, issue.6, pp.1589-1606, 2010.
DOI : 10.1175/2009JCLI2711.1

P. Laux, S. Wagner, A. Wagner, J. Jacobeit, A. Bardossy et al., Modelling daily precipitation features in the Volta Basin of West Africa, International Journal of Climatology, vol.10, issue.3, pp.937-954, 2009.
DOI : 10.1002/joc.1852

L. Barbé, L. Lebel, and T. , Rainfall climatology of the HAPEX-Sahel region during the years 1950???1990, Journal of Hydrology, vol.188, issue.189, pp.43-7310, 1997.
DOI : 10.1016/S0022-1694(96)03154-X

L. Barbé, L. Lebel, T. Tapsoba, and D. , Rainfall Variability in West Africa during the Years 1950???90, Journal of Climate, vol.15, issue.2, pp.187-202, 2002.
DOI : 10.1175/1520-0442(2002)015<0187:RVIWAD>2.0.CO;2

T. Lebel and A. A. , Recent trends in the Central and Western Sahel rainfall regime (1990???2007), Journal of Hydrology, vol.375, issue.1-2, pp.52-64, 1990.
DOI : 10.1016/j.jhydrol.2008.11.030
URL : https://hal.archives-ouvertes.fr/insu-00412630

T. Lebel and L. Barbé, Rainfall monitoring during HAPEX-Sahel. 2. Point and areal estimation at the event and seasonal scales, Journal of Hydrology, vol.188, issue.189, pp.97-122, 1997.
DOI : 10.1016/S0022-1694(96)03325-2

P. Legendre, L. Legendre, G. Mahé, and J. Paturel, Numerical ecology Sahelian annual rainfall variability and runoff increase of Sahelian Rivers, Comptes Rendus Geosci, vol.20, issue.3417, pp.1896-2006538, 1998.

L. Mariotti, E. Coppola, M. Sylla, F. Giorgi, and C. Piani, Regional climate model simulation of projected 21st century climate change over an all-Africa domain: Comparison analysis of nested and driving model results, Journal of Geophysical Research, vol.113, issue.D14, pp.10-1029, 2011.
DOI : 10.1029/2010JD015068

E. Meijgaard, L. Van-ulft, W. Van-de-berg, F. Bosveld, B. Van-den-hurk et al., The KNMI regional atmospheric climate model RACMO, version 2.1, 2008.

G. Millot, Comprendre et réaliser les tests statistiques avec R: Manuel pour les débutants De Boeck Modarres R (2010) Regional dry spells frequency analysis by l-moment and multivariate analysis, Water Resourc Manag, vol.24, issue.10, pp.2365-2380, 2009.

D. Montgomery, E. Peck, G. Vining, and J. Vining, Introduction to linear regression analysis Impact of soil moisture initialisation and lateral boundary conditions on regional climate model simulations of the West African Monsoon, Clim Dyn, vol.35, issue.1, pp.213-229, 2001.

N. Nakicenovic and R. Swart, Special report on emissions scenarios, p.598, 2000.

S. Nicholson, On the question of the ???recovery??? of the rains in the West African Sahel, Journal of Arid Environments, vol.63, issue.3, pp.615-641, 2005.
DOI : 10.1016/j.jaridenv.2005.03.004

H. Paeth, A. Hense, K. Born, R. Girmes, R. Podzun et al., SST versus Climate Change Signals in West African Rainfall: 20th-Century Variations and Future Projections, Climatic Change, vol.65, issue.1/2, pp.179-208114, 1175.
DOI : 10.1023/B:CLIM.0000037508.88115.8a

H. Paeth, N. Hall, M. Gaertner, M. Alonso, S. Moumouni et al., Progress in regional downscaling of west African precipitation, Atmospheric Science Letters, vol.34, issue.Suppl. 1, pp.75-82, 2011.
DOI : 10.1002/asl.306
URL : https://hal.archives-ouvertes.fr/insu-00648904

C. Prabhakara, R. Iacovazzi, . Jr, J. Yoo, and G. Dalu, Global warming: Evidence from satellite observations, Geophysical Research Letters, vol.394, issue.21, pp.3517-3520, 2000.
DOI : 10.1029/2000GL011719
URL : http://hdl.handle.net/2060/20000116342

B. Rockel, A. Will, and A. Hense, The regional climate model COSMO-CLM (CCLM), Meteorol Z, vol.17, issue.4, pp.347-348, 2008.

P. Samuelsson, C. Jones, U. Willén, A. Ullerstig, S. Gollvik et al., The Rossby Centre Regional Climate model RCA3: model description and performance, Tellus A, vol.72, issue.1, 2011.
DOI : 10.1111/j.1600-0870.2010.00478.x

A. Seghouane and S. Amari, The AIC Criterion and Symmetrizing the Kullback&ndash;Leibler Divergence, IEEE Transactions on Neural Networks, vol.18, issue.1, pp.97-106, 2007.
DOI : 10.1109/TNN.2006.882813

M. Sivakumar, Projecting rainy season potential from the onset of rains in Southern Sahelian and Sudanian climatic zones of West Africa* 1, Agric For Meteorol, vol.4288, issue.4, pp.295-305, 1988.

M. Sivakumar, Empirical Analysis of Dry Spells for Agricultural Applications in West Africa, Journal of Climate, vol.5, issue.5, pp.532-539, 1992.
DOI : 10.1175/1520-0442(1992)005<0532:EAODSF>2.0.CO;2

S. Solomon, D. Qin, M. Manning, Z. Chen, M. Marquis et al., Irreversible climate change due to carbon dioxide emissions, Proceedings of the National Academy of Sciences, vol.106, issue.6, p.1704, 2007.
DOI : 10.1073/pnas.0812721106

B. Sultan and S. Janicot, The West African Monsoon Dynamics. Part II: The ???Preonset??? and ???Onset??? of the Summer Monsoon, Journal of Climate, vol.16, issue.21, pp.3407-3427, 2003.
DOI : 10.1175/1520-0442(2003)016<3407:TWAMDP>2.0.CO;2
URL : https://hal.archives-ouvertes.fr/hal-00155510

E. Vanvyve, N. Hall, C. Messager, S. Leroux, and J. Van-ypersele, Internal variability in a regional climate model over West Africa, Climate Dynamics, vol.11, issue.5444, pp.191-202, 2008.
DOI : 10.1007/s00382-007-0281-6
URL : https://hal.archives-ouvertes.fr/hal-00388342

T. Vischel and T. Lebel, Assessing the water balance in the Sahel: Impact of small scale rainfall variability on runoff. Part 2: Idealized modeling of runoff sensitivity, Journal of Hydrology, vol.333, issue.2-4, pp.340-355, 2007.
DOI : 10.1016/j.jhydrol.2006.09.007
URL : https://hal.archives-ouvertes.fr/insu-00385413

B. Wang, J. Lee, I. Kang, J. Shukla, C. Park et al., Advance and prospectus of seasonal prediction: assessment of the APCC/CliPAS 14-model ensemble retrospective seasonal prediction (1980???2004), Climate Dynamics, vol.83, issue.1, pp.93-117, 1980.
DOI : 10.1007/s00382-008-0460-0

H. Wu, J. Guiot, S. Brewer, and Z. Guo, Climatic changes in Eurasia and Africa at the last glacial maximum and mid-Holocene: reconstruction from pollen data using inverse vegetation modelling, Climate Dynamics, vol.7, issue.3, pp.211-229, 2007.
DOI : 10.1007/s00382-007-0231-3
URL : https://hal.archives-ouvertes.fr/hal-00866993