Article Type:
Research Article

Spatial and Temporal Trends in Sunshine Duration over Western Europe (1938–2004)

Arturo Sanchez-Lorenzo Group of Climatology, University of Barcelona, Barcelona, Catalonia, Spain

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Josep Calbó Department of Physics and Institute of the Environment, University of Girona, Girona, Catalonia, Spain

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Javier Martin-Vide Group of Climatology, University of Barcelona, Barcelona, Catalonia, Spain

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Print Publication:
15 Nov 2008
DOI:
https://doi.org/10.1175/2008JCLI2442.1
Page(s):
6089–6098
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Abstract

This work analyzes sunshine duration variability in the western part of Europe (WEU) over the 1938–2004 period. A principal component analysis is applied to cluster the original series from 79 sites into 6 regions, and then annual and seasonal mean series are constructed on regional and also for the whole WEU scales. Over the entire period studied here, the linear trend of annual sunshine duration is found to be nonsignificant. However, annual sunshine duration shows an overall decrease since the 1950s until the early 1980s, followed by a subsequent recovery during the last two decades. This behavior is in good agreement with the dimming and brightening phenomena described in previous literature. From the seasonal analysis, the most remarkable result is the similarity between spring and annual series, although the spring series has a negative trend; and the clear significant increase found for the whole WEU winter series, being especially large since the 1970s. The behavior of the major synoptic patterns for two seasons is investigated, resulting in some indications that sunshine duration evolution may be partially explained by changes in the frequency of some of them.

Corresponding author address: Arturo Sanchez-Lorenzo, Group of Climatology, Department of Physical Geography, University of Barcelona, C/Montalegre No. 6, 08001 Barcelona, Spain. Email: asanchezlorenzo@ub.edu

Abstract

This work analyzes sunshine duration variability in the western part of Europe (WEU) over the 1938–2004 period. A principal component analysis is applied to cluster the original series from 79 sites into 6 regions, and then annual and seasonal mean series are constructed on regional and also for the whole WEU scales. Over the entire period studied here, the linear trend of annual sunshine duration is found to be nonsignificant. However, annual sunshine duration shows an overall decrease since the 1950s until the early 1980s, followed by a subsequent recovery during the last two decades. This behavior is in good agreement with the dimming and brightening phenomena described in previous literature. From the seasonal analysis, the most remarkable result is the similarity between spring and annual series, although the spring series has a negative trend; and the clear significant increase found for the whole WEU winter series, being especially large since the 1970s. The behavior of the major synoptic patterns for two seasons is investigated, resulting in some indications that sunshine duration evolution may be partially explained by changes in the frequency of some of them.

Corresponding author address: Arturo Sanchez-Lorenzo, Group of Climatology, Department of Physical Geography, University of Barcelona, C/Montalegre No. 6, 08001 Barcelona, Spain. Email: asanchezlorenzo@ub.edu

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  • Aguilar, E., I. Auer, M. Brunet, T. C. Peterson, and J. Wieringa, 2003: Guidelines on climate metadata and homogenization. World Meteorological Organization Tech. Rep. WMO-TD 1186, 52 pp.

  • Alpert, P., P. Kishcha, Y. J. Kaufman, and R. Schwarzbard, 2005: Global dimming or local dimming? Effect of urbanization on sunlight availability. Geophys. Res. Lett., 32 .L17802, doi:10.1029/2005GL023320.

    • Search Google Scholar
    • Export Citation

  • Angell, J. K., 1990: Variation in United States cloudiness and sunshine duration between 1950 and the drought year of 1988. J. Climate, 3 , 296–308.

    • Search Google Scholar
    • Export Citation

  • Auer, I., and Coauthors, 2007: HISTALP—Historical instrumental climatological surface time series of the greater Alpine region. Int. J. Climatol., 27 , 17–46.

    • Search Google Scholar
    • Export Citation

  • Brázdil, R., A. A. Flocas, and H. S. Sahsamanoglou, 1994: Fluctuation of sunshine duration in central and South-Eastern Europe. Int. J. Climatol., 14 , 1017–1034.

    • Search Google Scholar
    • Export Citation

  • Brunetti, M., M. Maugeri, T. Nanni, I. Auer, R. Böhm, and W. Schöner, 2006: Precipitation variability and changes in the greater Alpine region over the 1800–2003 period. J. Geophys. Res., 111 .D11107, doi:10.1029/2005JD006674.

    • Search Google Scholar
    • Export Citation

  • Charlson, R. J., J. Langner, H. Rodhe, C. B. Leovy, and S. G. Warren, 1991: Perturbation of the North Hemisphere radiative balance by backscattering from anthropogenic sulfate aerosols. Tellus, 43AB , 152–163.

    • Search Google Scholar
    • Export Citation

  • d’Almeida, G. A., P. Koepke, and E. P. Shettle, 1991: Atmospheric Aerosols: Global Climatology and Radiative Characteristics. A. Deepak, 561 pp.

    • Search Google Scholar
    • Export Citation

  • Gilgen, H., M. Wild, and A. Ohmura, 1998: Means and trends of shortwave irradiance at the surface estimated from Global Energy Balance Archive data. J. Climate, 11 , 2042–2061.

    • Search Google Scholar
    • Export Citation

  • Henderson-Sellers, A., 1992: Continental cloudiness changes this century. GeoJournal, 27 , 255–262.

  • Hurrell, J. W., and H. van Loon, 1997: Decadal variations in climate associated with the North Atlantic Oscillation. Climatic Change, 36 , 301–326.

    • Search Google Scholar
    • Export Citation

  • Kaiser, D. P., and Y. Qian, 2002: Decreasing trends in sunshine duration over China for 1954–1998: Indication of increased haze pollution? Geophys. Res. Lett., 29 .2042, doi:10.1029/2002GL016057.

    • Search Google Scholar
    • Export Citation

  • Klein Tank, A. M. G., and Coauthors, 2002: Daily dataset of 20th-century surface air temperature and precipitation series for the European climate assessment. Int. J. Climatol., 22 , 1441–1453.

    • Search Google Scholar
    • Export Citation

  • Liepert, B. G., 2002: Observed reductions of surface solar radiation at sites in the United States and worldwide from 1961 to 1990. Geophys. Res. Lett., 29 .1421, doi:10.1029/2002GL014910.

    • Search Google Scholar
    • Export Citation

  • Norris, J. R., and M. Wild, 2007: Trends in aerosol radiative effects over Europe inferred from observed cloud cover, solar “dimming,” and solar “brightening”. J. Geophys. Res., 112 .D08214, doi:10.1029/2006JD007794.

    • Search Google Scholar
    • Export Citation

  • Pinker, R. T., B. Zhang, and E. G. Dutton, 2005: Do satellites detect trends in surface solar radiation? Science, 308 , 850–854.

  • Pozo-Vázquez, D., J. Tovar-Pescador, S. R. Gámiz-Fortis, M. J. Esteban-Parra, and Y. Castro-Díez, 2004: NAO and solar radiation variability in the European North Atlantic region. Geophys. Res. Lett., 31 .L05201, doi:10.1029/2003GL018502.

    • Search Google Scholar
    • Export Citation

  • Preisendorfer, R. W., 1988: Principal Component Analysis in Meteorology and Oceanography. Elsevier, 425 pp.

  • Ramanathan, V., P. J. Crutzen, J. T. Kiehl, and D. Rosenfeld, 2001: Aerosols, climate, and the hydrological cycle. Science, 294 , 2119–2124.

    • Search Google Scholar
    • Export Citation

  • Roca, J., E. Padilla, M. Farré, and V. Galletto, 2001: Economic growth and atmospheric pollution in Spain: Discussing the environmental Kuznets curve hypothesis. Ecol. Econ., 39 , 85–99.

    • Search Google Scholar
    • Export Citation

  • Romanou, A., B. Liepert, G. A. Schmidt, W. B. Rossow, R. A. Ruedy, and Y. Zhang, 2007: 20th century changes in surface solar irradiance in simulations and observations. Geophys. Res. Lett., 34 .L05713, doi:10.1029/2006GL028356.

    • Search Google Scholar
    • Export Citation

  • Sanchez-Lorenzo, A., M. Brunetti, J. Calbó, and J. Martin-Vide, 2007: Recent spatial and temporal variability and trends of sunshine duration over the Iberian Peninsula from a homogenized dataset. J. Geophys. Res., 112 .D20115, doi:10.1029/2007JD008677.

    • Search Google Scholar
    • Export Citation

  • Stanhill, G., 2005: Global dimming: A new aspect of climate change. Weather, 60 , 11–14.

  • Stanhill, G., 2007: A perspective on global warming, dimming, and brightening. Eos, Trans. Amer. Geophys. Union, 88 , 58–59.

  • Stanhill, G., and S. Cohen, 2001: Global dimming: A review of the evidence for a widespread and significant reduction in global radiation with discussion of its probable causes and possible agricultural consequences. Agric. For. Meteor., 107 , 255–278.

    • Search Google Scholar
    • Export Citation

  • Stanhill, G., and S. Cohen, 2005: Solar radiation changes in the United States during the twentieth century: Evidence from sunshine duration measurements. J. Climate, 18 , 1503–1512.

    • Search Google Scholar
    • Export Citation

  • Streets, D. G., Y. Wu, and M. Chin, 2006: Two-decadal aerosol trends as a likely explanation of the global dimming/brightening transition. Geophys. Res. Lett., 33 .L15806, doi:10.1029/2006GL026471.

    • Search Google Scholar
    • Export Citation

  • Trenberth, K. E., and D. A. Paolino, 1980: The Northern Hemisphere sea-level pressure data set: Trends, errors, and discontinuities. Mon. Wea. Rev., 108 , 855–872.

    • Search Google Scholar
    • Export Citation

  • Trenberth, K. E., and Coauthors, 2007: Observations: Surface and atmospheric climate change. Climate Change 2007: The Physical Science Basis, S. Solomon et al., Eds., Cambridge University Press, 235–336.

    • Search Google Scholar
    • Export Citation

  • Warren, S. G., R. M. Eastman, and C. J. Hahn, 2007: A survey of changes in cloud cover and cloud types over land from surface observations, 1971–96. J. Climate, 20 , 717–738.

    • Search Google Scholar
    • Export Citation

  • Wheeler, D., 2001: Factors governing sunshine in south-west Iberia: A review of western Europe’s sunniest region. Weather, 56 , 189–197.

    • Search Google Scholar
    • Export Citation

  • Wild, M., and Coauthors, 2005: From dimming to brightening: Decadal changes in solar radiation at earth’s surface. Science, 308 , 847–850.

    • Search Google Scholar
    • Export Citation

  • Wild, M., A. Ohmura, and K. Makowski, 2007: Impact of global dimming and brightening on global warming. Geophys. Res. Lett., 34 .L04702, doi:10.1029/2006GL028031.

    • Search Google Scholar
    • Export Citation