Biel, A.: Nubosidad e insolación, Boletín Mensual Climatológico, Servicio Meteorológico Nacional, Madrid, 2–9, 1963.
Biggs, T. W., Scott, C. A., Rajagopalan, B., and Turral, H. N.: Trends in solar radiation due to clouds and aerosols, southern India, 1952–1997, Int. J. Climatol., 27, 1505–1518, 2007.
Brönnimann, S., Annis, J., Dann, W., Ewen, T., Grant, A. N., Griesser, T., Krähenmann, S., Mohr, C., Scherer, M., and Vogler, C.: A guide for digitising manuscript climate data, Clim. Past, 2, 137–144, https://doi.org/10.5194/cp-2-137-2006, 2006.
Brunetti, M., Lentini, G., Maugeri, M., Nanni, T., Auer, I., Böhm, R., and Schöner, W.: Climate variability and change in the Greater Alpine Region over the last two centuries based on multi-variable analysis, Int. J. Climatol., 19, 2197–2225, 2009.
Calbó, J. and Sanchez-Lorenzo, A.: Cloudiness climatology in the Iberian Peninsula from three global gridded datasets (ISCCP, CRU TS 2.1, ERA-40), Theor. Appl. Climatol., 96, 105–115, 2009.
Cermak, J., Wild, M., Knutti, R., Mishchenko, M. I., and Heidinger, A. K.: Consistency of global satellite-derived aerosol and cloud data sets with recent brightening observations, Geophys. Res. Lett., 37, L21704, https://doi.org/10.1029/2010GL044632, 2010.
Changnon, S. A.: Midwestern Cloud, Sunshine and Temperature Trends since 1901: Possible Evidence of Jet Contrail Effects, J. Appl. Meteorol., 20, 496–508, 1981.
Curto, J., Also, E., Pallé, E., and Solé, G.: Sunshine and synoptic cloud observations at Ebro Observatory, 1910–2006, Int. J. Climatol., 29, 2183–2190, 2009.
Dai, A., Del Genio, A. D., and Fung, I. Y.: Clouds, precipitation, and temperature range, Nature, 386, 665–666, 1997.
Dai, A., Trenberth, K. E., and Karl, T. R.: Effects of clouds, soil moisture, precipitation, and water papor on diurnal temperature range, J. Climate, 12, 2451–2473, 1999.
Dai, A., Karl, T. R., Sun, B., and Trenberth, K. E.: Recent trends in cloudiness over the United States: a tale of monitoring inadequacies, B. Am. Meteorol. Soc., 87, 597–606, 2006.
Eastman, R., Warren, S., and Hahn, C.: Variations in cloud cover and cloud types over the ocean from surface observations, 1954–2008, J. Climate, 24, 5914–5934, 2011.
Elms, J. D., Woodruff, S. D., Worley, S. J., and Hanson, C.: Digitizing Historical Records for the Comprehensive Ocean-Atmosphere Data Set (COADS), Earth Syst. Monitor, 4, 4–10, 1993.
Evan, A. T., Heidinger, A. K., and Vimont, D.: Arguments against a physical long-term in global ISCCP cloud amounts, Geophys. Res. Lett., 34, L04701, https://doi.org/10.1029/2006GL028083, 2007.
Gagen, M., Zorita, E., McCarroll, D., Young, G. H. F., Grudd, H., Jalkanen, R., Loader, N. J., Robertson, I., and Kirchhefer, A.: Cloud response to summer temperatures in Fennoscandia over the last thousand years, Geophys. Res. Lett., 38, L05701, https://doi.org/10.1029/2010GL046216, 2011.
Gallego, M. C., Trigo, R. M., Vaquero, J. M., Brunet, M., García, J. A., Sigró, J., and Valente, M. A.: Trends in frequency indices of daily precipitation over the Iberian Peninsula during the last century, J. Geophys. Res., 116, D02109, https://doi.org/10.1029/2010JD014255, 2011.
Henderson-Sellers, A.: North American total cloud amount variations this century, Global Planet. Change, 1, 175–194, 1989.
Houghton, J. T., Jenkins, G. J., and Ephraums, J. J. (Eds.): Climate Change: The IPCC Scientific Assessment, Report prepared for Intergovernmental Panel on Climate Change by Working Group I, Cambridge University Press, Cambridge, UK, New York, NY, USA and Melbourne, Australia, 1990.
Houghton, J. T., Meira Filho, L. G., Callander, B. A., Harris, N., Kattenberg, A., and Maskell, K. (Eds.): Climate Change 1995: The Science of Climate Change, Contribution of WGI to the Second Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, Cambridge, UK and New York, NY, USA, 1996.
Houghton, J. T., Ding, Y. Griggs, D. J., Noguer, M., van der Linden, P. J., Dai, X., Maskell, K., and Johnson, C. A. (Eds.): Climate Change 2001: The Scientific Basis, Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, Cambridge, UK and New York, NY, USA, 2001.
Ishii, M., Shouji, A., Sugimoto, S., and Matsumoto, T.: Objective analyses of sea-surface temperature and marine meteorological variables for the 20$^th$ century using ICOADS and the Kobe collection, Int. J. Climatol., 25, 865–879, 2005.
Jovanovic, B., Collins, D., Braganza, K., Jakob, D., and Jones, D. A.: A high-quality monthly total cloud amount dataset for Australia, Climatic Change, 108, 485–517, 2011.
Kaiser, D. P.: Decreasing cloudiness over China: An updated analysis examining additional variables, Geophys. Res. Lett., 27, 2193–2196, https://doi.org/10.1029/2000GL011358, 2000.
Karl, T. R. and Steurer, P. M.: Increased cloudiness in the United States during the first half of the twentieth century: fact or fiction?, Geophys. Res. Lett., 17, 1925–1928, 1990.
Karl, T. R., Knight, R. W., Gallo, K. P., Peterson, T. C., Jones, P. D., Kukla, G., Plummer, N., Razuvayev, V., Lindseay, J., and Charlson, R. J.: A New Perspective on Recent Global Warming: Asymmetric Trends of Daily Maximum and Minimum Temperature, B. Am. Meteorol. Soc., 74, 1007–1023, 1993.
Kruger, A. C.: Trends in cloud cover from 1960 to 2005 over South Africa, Water SA, 33, 603–608, 2007.
Lewik, P., Matuszko, D., and Morawska-Horawska, M.: Multi-Annual Variability of Cloudiness and Sunshine Duration in Cracow Between 1826 and 2005, in: The Polish Climate in the European Context: An Historical Overview, edited by: Przybylak, R., Majorowicz, J., Brázdil, R., and Kejan, M., Springer Science + Business Media, 341–353, 2010.
Mace, G. G., Benson, S., and Kato, S.: Cloud radiative forcing at the Atmospheric Radiation Measurement Program Climate Research Facility: 2. Vertical redistribution of radiant energy by clouds, J. Geophys. Res., 111, D11S91, https://doi.org/10.1029/2005JD005922, 2006.
Maugeri, M., Bagnati, Z., Brunetti, M., and Nanni, T.: Trends in Italian total cloud amount, 1951–1996, Geophys. Res. Lett., 28, 4551–4554, https://doi.org/10.1029/2001GL013754, 2001.
Matuszko, D.: Cloudiness changes in Cracow in the 20th century, Int. J. Climatol., 23, 975–984, 2003.
Moberg, A., Alexandersson, H., Bergström, H., and Jones, P.D.: Were southern Swedish summer temperatures before 1860 as warm as measured?, Int. J. Climatol., 23, 1495–1521, 2003.
Norris, J. R.: On trends and possible artifacts in global ocean cloud cover between 1952 and 1995, J. Climate, 12, 1864–1870, 1999.
Norris, J. R.: Multidecadal changes in near-global cloud cover and estimated cloud cover radiative forcing, J. Geophys. Res., 110, D08206, https://doi.org/10.1029/2004JD005600, 2005.
Pallé, E. and Butler, C. J.: Sunshine records from Ireland, cloud factors and possible links to solar activity and climate, Int. J. Climatol., 21, 709–729, 2001.
Pallé, E. and Butler, C. J.: The proposed connection between clouds and cosmic rays: cloud behaviour during the past 50–120 years, J. Atmos. Sol.-Ter. Phy., 64, 327–337, 2002a.
Pallé, E. and Butler, C. J.: Comparison between sunshine records and synoptic cloud observations: a case study for Ireland, Phys. Chem. Earth, 27, 405–414, 2002b.
Parungo, F., Boatman, J. F., Sievering, H., and Hicks, B. B.: Trends in global marine cloudiness and anthropogenic sulfur, J. Climate, 23, 434–440, 1994.
Qian, Y., Kaiser, D. P., Leung, L. R., and Xu, M.: More frequent cloud-free sky and less surface solar radiation in China from 1955 to 2000, Geophys. Res. Lett., 33, L01812, https://doi.org/10.1029/2005GL024586, 2006.
Randall, D. A., Wood, R. A., Bony, S., Colman, R., Fichefet, T., Fyfe, J., Kattsov, V., Pitman, A., Shukla, J., Srinivasan, J., Stouffer, R. J., Sumi, A., and Taylor, K. E.: Climate Models and Their Evaluation, in: Climate Change 2007: The Physical Science Basis, Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K. B., Tignor, M., and Miller, H. L., Cambridge University Press, Cambridge, UK and New York, NY, USA, 589–662, 2007.
Sanchez-Lorenzo, A. and Wild, M.: Decadal variations in estimated surface solar radiation over Switzerland since the late 19th century, Atmos. Chem. Phys. Discuss., 12, 10815–10843, https://doi.org/10.5194/acpd-12-10815-2012, 2012.
Sanchez-Lorenzo, A., Brunetti, M., Calbó, J., and Martin-Vide, J.: Recent spatial and temporal variability and trends of sunshine duration over the Iberian Peninsula from a homogenized dataset, J. Geophys. Res., 112, D20115, https://doi.org/10.1029/2007JD008677, 2007.
Sanchez-Lorenzo, A., Calbó, J., Brunetti, M., and Deser, C.: Dimming/brightening over the Iberian Peninsula: Trends in sunshine duration and cloud cover, and their relations with atmospheric circulation, J. Geophys. Res., 114, D00D09, https://doi.org/10.1029/2008JD011394, 2009.
Seaver, W. L. and Lee, J. E.: A Statistical Examination of Sky Cover Changes in the Contiguous United States, J. Clim. Appl. Meteorol., 26, 88–95, 1987.
Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K., Tignor, M., and Miller, H. (Eds.): Climate Change 2007: The Physical Science Basis, Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, Cambridge, UK and New York, NY, USA, 2007.
Sun, B..: Cloudiness over the contiguous United States: Contemporary changes observed using ground-based and ISCCP D2 data, Geophys. Res. Lett., 30, 1053, https://doi.org/10.1029/2002GL015887, 2003.
Tuomenvirta, H., Alexandersson, H., Drebs, A., Frich, P., and Nordli, P. O.: Trends in Nordic and Arctic temperature extremes and ranges, J. Climate, 13, 977–990, 2000.
Warren, S. G., Hahn, C. J., London, J., Chervin, R. M., and Jenne, R. L.: Global distribution of total cloud cover and cloud type amounts over the ocean, NCAR Technical Note, TN-317+STR, National Center for Atmospheric Research, Boulder, Colorado, USA, 42 pp. + 170 maps, 1988.
Wibig, J.: Cloudiness variations in Łodz in the second half of the 20th century, Int. J. Climatol., 28, 479–491, 2008.
Wild, M.: Global dimming and brightening: A review, J. Geophys. Res., 114, D00D16, https://doi.org/10.1029/2008JD011470, 2009.
Wild, M.: Enlightening global dimming and brightening, B. Am. Meteorol. Soc., 93, 27–37, 2012.
Woodruff, S. D., Worley, S. J., Lubker, S. J., Ji, Z., Freeman, J. E., Berry, D. I., Brohan, P., Kent, E. C., Reynolds, R. W., Smith, S. R., and Wilkinson, C.: ICOADS Release 2.5: extensions and enhancements to the surface marine meteorological archive, Int. J. Climatol., 31, 951–967, 2011.
Wright, P. B.: Problems in the Use of Ship Observations for the Study of Interdecadal Climate Changes, Mon. Weather Rev., 114, 1028-1034, 1986.
Xia, X.: Spatiotemporal changes in sunshine duration and cloud amount as well as their relationship in China during 1954–2005, J. Geophys. Res., 115, D00K06, https://doi.org/10.1029/2009JD012879, 2010.
You, Q., Kang, S., Flügel, W.-A., Sanchez-Lorenzo, A., Yan, Y., Huang, J., and Martin-Vide, J.: From brightening to dimming in sunshine duration over the eastern and central Tibetan Plateau (1961–2005), Theor. Appl. Climatol., 101, 445–457, 2010.
Young, G. H. F., McCarroll, D., Loader, N. J., and Kirchhefer, A.: A 500-year record of summer near-ground solar radiation from tree-ring stable carbon isotopes, Holocene, 20, 315–324, 2010.