A. Agustì-panareda and A. Beljaars, ECMWF's contribution to AMMA, ECMWF Newsletter, vol.115, 2008.

P. Andersson, A. Bechtold, H. Fink, J. Hersbach, J. Lafore et al., Radiosonde humidity bias correction over the West African region for the special AMMA reanalysis at ECMWF. submitted to Quart, J. Roy, 2006.
URL : https://hal.archives-ouvertes.fr/meteo-00384824

A. Ali and T. Lebel, The Sahelian standardized rainfall index revisited, International Journal of Climatology, vol.87, issue.12, 2008.
DOI : 10.1002/joc.1832

URL : https://hal.archives-ouvertes.fr/insu-00411889

G. J. Berry and C. Thorncroft, Case Study of an Intense African Easterly Wave, Monthly Weather Review, vol.133, issue.4, pp.752-766, 2005.
DOI : 10.1175/MWR2884.1

A. K. Betts and J. H. Ball, FIFE Surface Climate and Site-Average Dataset 1987???89, Journal of the Atmospheric Sciences, vol.55, issue.7, pp.1091-1108
DOI : 10.1175/1520-0469(1998)055<1091:FSCASA>2.0.CO;2

A. K. Betts, J. D. Fuentes, M. Garstang, and J. H. Ball, Surface diurnal cycle and boundary layer structure over Rond??nia during the rainy season, Journal of Geophysical Research, vol.8, issue.D20, p.8065
DOI : 10.1029/2001JD000356

A. K. Betts, Understanding Hydrometeorology Using Global Models, Bulletin of the American Meteorological Society, vol.85, issue.11, pp.1673-1688, 2004.
DOI : 10.1175/BAMS-85-11-1673

J. G. Charney, Dynamics of deserts and drought in the Sahel, Quarterly Journal of the Royal Meteorological Society, vol.21, issue.428, pp.193-202, 1975.
DOI : 10.1002/qj.49710142802

C. Chou and J. D. Neelin, Mechanisms Limiting the Northward Extent of the Northern Summer Monsoons over North America, Asia, and Africa*, Journal of Climate, vol.16, issue.3, pp.406-425, 2003.
DOI : 10.1175/1520-0442(2003)016<0406:MLTNEO>2.0.CO;2

K. H. Cook, Generation of the African Easterly Jet and Its Role in Determining West African Precipitation, Journal of Climate, vol.12, issue.5, pp.1165-1184, 1999.
DOI : 10.1175/1520-0442(1999)012<1165:GOTAEJ>2.0.CO;2

K. H. Cook and E. K. 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

A. Diongue, J. Lafore, J. Redelsperger, and R. Roca, Numerical study of a Sahelian synoptic weather system: Initiation and mature stages of convection and its interactions with the large-scale dynamics, Quarterly Journal of the Royal Meteorological Society, vol.105, issue.189, pp.1899-1927, 2002.
DOI : 10.1256/003590002320603467

E. A. Eltahir, A Soil Moisture-Rainfall Feedback Mechanism: 1. Theory and observations, Water Resources Research, vol.38, issue.4, pp.765-776, 1998.
DOI : 10.1029/97WR03499

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.455.1929

E. A. Eltahir and C. Gong, Dynamics of Wet and Dry Years in West Africa, Journal of Climate, vol.9, issue.5, pp.1030-1042, 1996.
DOI : 10.1175/1520-0442(1996)009<1030:DOWADY>2.0.CO;2

C. K. Folland, T. N. Palmer, and D. E. Parker, Sahel rainfall and worldwide sea temperatures, 1901???85, Nature, vol.312, issue.6063, pp.602-607, 1986.
DOI : 10.1038/320602a0

J. P. Grist and S. E. Nicholson, A Study of the Dynamic Factors Influencing the Rainfall Variability in the West African Sahel, Journal of Climate, vol.14, issue.7, pp.1337-1359, 2001.
DOI : 10.1175/1520-0442(2001)014<1337:ASOTDF>2.0.CO;2

C. J. Grenier, M. Jones, J. Koehler, R. Piriou, M. Tailleux et al., Modelling the diurnal cycle of deep precipitating convection over land with CRMs and SCMs, Quart. J. Roy. Meteor. Soc, vol.130, pp.3139-3172, 2004.
URL : https://hal.archives-ouvertes.fr/meteo-00340107

E. Lamptey, J. Orlandi, M. Sander, A. Zampieri, F. Boone et al., Simulations and observations of rainfall and evapotranspiration associated with a mesoscale convective event over West Africa. to be submitted to Wea, For, 2008.

F. Guichard, L. Kergoat, E. Mougin, F. Timouk, F. Baup et al., Surface thermodynamics and radiative budget in the Sahelian Gourma: Seasonal and diurnal cycles, Journal of Hydrology, vol.375, issue.1-2, 2008.
DOI : 10.1016/j.jhydrol.2008.09.007

URL : https://hal.archives-ouvertes.fr/meteo-00340108

P. Dell-'aquila, H. Marquet, T. L. Gallee, A. Doval, J. Traore et al., The AMMA-Model Intercomparison Project, 2008.

J. S. Hsieh and K. H. Cook, Generation of African Easterly Wave Disturbances: Relationship to the African Easterly Jet, Monthly Weather Review, vol.133, issue.5, pp.1311-1327, 2005.
DOI : 10.1175/MWR2916.1

M. Hulme, Climatic perspectives on Sahelian desiccation: 1973???1998, Global Environmental Change, vol.11, issue.1, pp.19-29, 2001.
DOI : 10.1016/S0959-3780(00)00042-X

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.502.5319

F. Redelsperger, C. E. Ravegnani, R. Reeves, P. Roca, H. De-rosnay et al., Ulanovsky1, and ACMAD forecasters team, 2008: Large-scale overview of the summer monsoon over West Africa during the AMMA field experiment in, Ann. Geophys, vol.26, pp.2569-2595, 2006.

P. J. Lamb, Large-scale tropical surface circulation patterns associated with Subsaharan weather anomalies, Tellus, vol.30, pp.240-251, 1978.
DOI : 10.1111/j.2153-3490.1978.tb00839.x

URL : http://www.tellusa.net/index.php/tellusa/article/view/10338

K. Lau and S. Yang, Seasonal Variation, Abrupt Transition, and Intraseasonal Variability Associated with the Asian Summer Monsoon in the GLA GCM, Journal of Climate, vol.9, issue.5, pp.965-985, 1996.
DOI : 10.1175/1520-0442(1996)009<0965:SVATAI>2.0.CO;2

K. M. Lau, S. S. Shen, K. M. Kim, and H. Wang, A multimodel study of the twentieth-century simulations of Sahel drought from the 1970s to 1990s, Journal of Geophysical Research, vol.286, issue.D14, p.7111, 2006.
DOI : 10.1029/2005JD006281

L. Barbé, L. , T. Lebel, and D. Tapsoba, Rainfall variability in West Africa during the years, pp.1950-90, 2002.

T. Lebel, F. Delclaux, L. L. Barbé, and J. Polcher, From GCM scales to hydrological scales: rainfall variability in West Africa, Stochastic Environmental Research and Risk Assessment, vol.14, issue.4, pp.275-295, 2000.
DOI : 10.1007/s004770000050

V. Mathon, H. Laurent, and T. Lebel, Mesoscale Convective System Rainfall in the Sahel, Journal of Applied Meteorology, vol.41, issue.11, pp.1081-1092, 2002.
DOI : 10.1175/1520-0450(2002)041<1081:MCSRIT>2.0.CO;2

M. Matthews, Intraseasonal Variability over Tropical Africa during Northern Summer, Journal of Climate, vol.17, issue.12, pp.2427-2440, 2004.
DOI : 10.1175/1520-0442(2004)017<2427:IVOTAD>2.0.CO;2

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.330.6675

M. A. Miller and A. Slingo, The Arm Mobile Facility and Its First International Deployment: Measuring Radiative Flux Divergence in West Africa, Bulletin of the American Meteorological Society, vol.88, issue.8, pp.1229-1244, 2007.
DOI : 10.1175/BAMS-88-8-1229

M. Nuret, J. Lafore, O. Bock, F. Guichard, A. Agusti-panareda et al., Correction of humidity bias for Vaisala, 2007.
URL : https://hal.archives-ouvertes.fr/meteo-00362749

D. J. Parker, C. D. Thorncroft, R. R. Burton, and A. Diongue-niang, Analysis of the African easterly jet, using aircraft observations from the JET2000 experiment, Quarterly Journal of the Royal Meteorological Society, vol.108, issue.608, pp.1461-1482, 2005.
DOI : 10.1256/qj.03.189

D. J. Parker, A. Fink, S. Janicot, J. Ngamini, M. Douglas et al., The Amma Radiosonde Program and its Implications for the Future of Atmospheric Monitoring Over Africa, Bulletin of the American Meteorological Society, vol.89, issue.7, pp.1015-1027, 2008.
DOI : 10.1175/2008BAMS2436.1

URL : https://hal.archives-ouvertes.fr/insu-00389077

P. Peyrille, J. Lafore, and J. Redelsperger, An Idealized Two-Dimensional Framework to Study the West African Monsoon. Part I: Validation and Key Controlling Factors, Journal of the Atmospheric Sciences, vol.64, issue.8, pp.2765-2782, 2007.
DOI : 10.1175/JAS3919.1

R. Ramel, C. Gallée, and . Messager, On the northward shift of the West African monsoon, Climate Dynamics, vol.11, issue.3, pp.429-440, 2006.
DOI : 10.1007/s00382-005-0093-5

URL : https://hal.archives-ouvertes.fr/insu-00375755

R. J. Reed, D. C. Norquist, and E. E. Recker, The Structure and Properties of African Wave Disturbances as Observed During Phase III of GATE, Monthly Weather Review, vol.105, issue.3, pp.317-333, 1977.
DOI : 10.1175/1520-0493(1977)105<0317:TSAPOA>2.0.CO;2

J. Redelsperger, C. Thorncroft, A. Diedhiou, T. Lebel, D. J. Parker et al., African Monsoon Multidisciplinary Analysis (AMMA): An international research project and field campaign, 2006.

O. Samain, L. Kergoat, P. Hiernaux, F. Guichard, E. Mougin et al., Analysis of the in-situ and MODIS albedo variability at multiple time scales in the Sahel, J. Geophys. Res, pp.10-1029, 2008.
URL : https://hal.archives-ouvertes.fr/ird-00391544

H. Chlond, C. Grenier, M. Jones, H. Kohler, P. Kitagawa et al., Cloud representation in general-circulation models over the northern Pacific Ocean: A EUROCS intercomparison study, Quart. J. Roy. Meteor. Soc, vol.130, pp.3245-3267, 2004.

N. Söhne, J. Chaboureau, and F. Guichard, Verification of cloud cover forecast with satellite observation over West Africa, Mon. Wea. Rev., early online release. [DOI: 10, 1175.

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.3389-3406, 2003.
DOI : 10.1175/1520-0442(2003)016<3407:TWAMDP>2.0.CO;2

URL : https://hal.archives-ouvertes.fr/hal-00155510

C. M. Taylor and T. Lebel, Observational Evidence of Persistent Convective-Scale Rainfall Patterns, Monthly Weather Review, vol.126, issue.6, pp.1597-1607, 1998.
DOI : 10.1175/1520-0493(1998)126<1597:OEOPCS>2.0.CO;2

C. M. Taylor and D. B. Clark, The diurnal cycle and African easterly waves: A land surface perspective, Quarterly Journal of the Royal Meteorological Society, vol.125, issue.213, pp.845-867, 2001.
DOI : 10.1002/qj.49712757308

C. M. Taylor, E. F. Lambin, N. Stephenne, R. J. Harding, and R. L. Essery, The Influence of Land Use Change on Climate in the Sahel, Journal of Climate, vol.15, issue.24, pp.3615-3629, 2002.
DOI : 10.1175/1520-0442(2002)015<3615:TIOLUC>2.0.CO;2

C. D. Thorncroft and M. Blackburn, Maintenance of the African easterly jet, Quarterly Journal of the Royal Meteorological Society, vol.30, issue.555, pp.763-786, 1997.
DOI : 10.1002/qj.49712555502

C. D. Thorncroft and K. Hodges, African Easterly Wave Variability and Its Relationship to Atlantic Tropical Cyclone Activity, Journal of Climate, vol.14, issue.6, pp.1166-1179, 2001.
DOI : 10.1175/1520-0442(2001)014<1166:AEWVAI>2.0.CO;2

C. D. Thorncroft, D. J. Parker, R. R. Burton, M. Diop, J. H. Ayers et al., The JET2000 Project: Aircraft Observations of the African Easterly Jet and African Easterly Waves, Bulletin of the American Meteorological Society, vol.84, issue.3, pp.337-351, 2003.
DOI : 10.1175/BAMS-84-3-337

A. M. Tompkins, C. Cardinali, J. Morcrette, and M. , Influence of aerosol climatology on forecasts of the African Easterly Jet, Geophysical Research Letters, vol.8, issue.D18, p.10801, 2005.
DOI : 10.1029/2004GL022189

S. D. Schemm, A. Schubert, W. M. Sealy, A. Thiaw, E. K. Vintzileos et al., The West African Monsoon Modeling and Evaluation project (WAMME) and its First Model Intercomparison Experiment, 2008.
URL : https://hal.archives-ouvertes.fr/hal-00320562

Y. Xue, P. M. Ruti, A. Boone, and F. Hourdin, West African monsoon and its modeling, 2008.
URL : https://hal.archives-ouvertes.fr/hal-00320562

X. Zheng and E. A. Eltahir, A Soil Moisture-Rainfall Feedback Mechanism: 2. Numerical experiments, Water Resources Research, vol.24, issue.4, pp.777-785, 1998.
DOI : 10.1029/97WR03497