G. Bellon, G. Gastineau, A. Ribes, and H. L. Treut, Analysis of the variability 480 of the tropical climate in a two-column framework, 2011.

S. Bony and J. Dufresne, Marine boundary layer clouds at the heart of cloud 483 feedback uncertainties in climate models, Geophys. Res. Lett, vol.32, issue.20, pp.484-494, 2005.

S. Bony, J. Dufresne, H. L. Treut, J. Morcrette, and C. Senior, On dynamic and thermodynamic components of cloud changes, Climate Dynamics, vol.22, issue.2-3, pp.71-86, 2004.
DOI : 10.1007/s00382-003-0369-6

Y. Desormeaux, W. B. Rossow, C. L. Brest, and G. G. Campbell, Normalization 493 and calibration of geostationary satellite radiances for the International Satellite Cloud 494, 1993.

A. Fairhead, I. Idelkadi, J. Musat, A. Dufresne, M. Lahellec et al., LMDZ5B: the atmospheric component of the IPSL climate model with revisited 498 parameterizations for clouds and convection, Clim. Dyn, vol.79, pp.10-1007, 2012.

S. A. Klein and D. L. Hartmann, The Seasonal Cycle of Low Stratiform Clouds, Journal of Climate, vol.6, issue.8, p.500, 1993.
DOI : 10.1175/1520-0442(1993)006<1587:TSCOLS>2.0.CO;2

D. Konsta, . Jl, H. Dufresne, A. Chepfer, G. Idelkali et al., 2012: Evaluation of 505 clouds simulated by the LMDZ5 GCM using A-train satellite observations (CALIPSO- 506 PARASOL-CERES, Clim. Dyn., under review, p.507

T. L. Kubar, D. E. Waliser, and J. Li, Boundary layer and cloud structure 508 controls on tropical low cloud cover using A-Train satellite data and ECMWF Analyses, J, p.509, 2010.

N. C. Lau and M. W. , Crane 1995: A Satellite View of the Synoptic-Scale 511

G. S. Mauger and J. R. Norris, Assessing the Impact of Meteorological History on Subtropical Cloud Fraction, Journal of Climate, vol.23, issue.11, pp.2926-2940, 2010.
DOI : 10.1175/2010JCLI3272.1

B. Medeiros and B. Stevens, Revealing differences in GCM representations of low clouds, Climate Dynamics, vol.27, issue.612, pp.385-399, 2009.
DOI : 10.1007/s00382-009-0694-5

C. Nam, S. Bony, H. Dufresne, and . Chepfer, 2012: The 'too few, too bright' tropical 518 low-cloud problem in CMIP5 models, Geophys. Res. Lett, pp.10-1029, 2012053421.

J. R. Norris, Low cloud type over the ocean from surface observations. I, p.520, 1998.

J. R. Norris and S. A. Klein, Low Cloud Type over the Ocean from Surface Observations. Part III: Relationship to Vertical Motion and the Regional Surface Synoptic Environment, Journal of Climate, vol.13, issue.1, pp.245-256, 2000.
DOI : 10.1175/1520-0442(2000)013<0245:LCTOTO>2.0.CO;2

M. A. Ringer, Global mean cloud feedbacks in idealized climate change experiments, Geophysical Research Letters, vol.99, issue.7, pp.7718-530, 2006.
DOI : 10.1029/2005GL025370

W. B. Rossow, A. W. Walker, and L. C. Garder, Comparison of ISCCP and Other Cloud Amounts, Journal of Climate, vol.6, issue.12, pp.2394-2418, 1993.
DOI : 10.1175/1520-0442(1993)006<2394:COIAOC>2.0.CO;2

M. A. Rozendaal and W. B. Rossow, Characterizing Some of the Influences of the General Circulation on Subtropical Marine Boundary Layer Clouds, Journal of the Atmospheric Sciences, vol.60, issue.5, pp.711-546, 2003.
DOI : 10.1175/1520-0469(2003)060<0711:CSOTIO>2.0.CO;2

I. Sandu, B. Stevens, and R. Pincus, On the transitions in marine boundary layer cloudiness, Atmospheric Chemistry and Physics, vol.10, issue.5, pp.2377-2391, 2010.
DOI : 10.5194/acp-10-2377-2010

S. A. Venegas, L. A. Mysak, and D. N. Straub, Evidence for interannual and interdecadal climate variability in the South Atlantic, Geophysical Research Letters, vol.68, issue.19, pp.2673-2676, 1996.
DOI : 10.1029/96GL02373

M. J. Webb, On the contribution of local feedback mechanisms to the range of climate sensitivity in two GCM ensembles, Climate Dynamics, vol.99, issue.D14, pp.17-38, 2006.
DOI : 10.1007/s00382-006-0111-2

K. D. Williams, M. A. Ringer, and C. A. Senior, Evaluating the cloud response 562 to climate change and current climate variability, Climate Dynamics, vol.20, pp.705-721, 2003.

D. M. Winker, M. A. Vaughan, A. Omar, Y. X. Hu, and K. A. Powell, Overview of the CALIPSO Mission and CALIOP Data Processing Algorithms, Journal of Atmospheric and Oceanic Technology, vol.26, issue.11, pp.2310-2323, 2009.
DOI : 10.1175/2009JTECHA1281.1

M. Wyant, C. Bretherton, and P. Blossey, Subtropical low cloud response to a 567 warmer climate in an superparameterized climate model: Part I. Regime sorting and physical 568 mechanisms, Journal of Advances in Modeling Earth Systems, issue.0, p.0, 2009.

. Wsu-warm, SSu-warm. The horizontal dashed lines correspond to the values 703 of standard deviations. Values of the trends in 27 years are indicated in the titles for both 704 NCEP and ERA-Interim reanalysis, and the significant ones are in rectangles. Vertical lines 705 are the same as in Fig. 2. f-g. Equivalent trends (the value of the linear regression slope of 706 the curve, multiplied by the number of years) values over 27 years for DJF (f.) and JJA (g

A. Figure, 5: Time evolution of the clear sky reflectance, during the complete period (in blue)