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Kajsa Parding; Jan A. Olseth; Knut F. Dagestad; Beate G. Liepert (2014)
Publisher: Taylor & Francis Group
Journal: Tellus: Series B
Languages: English
Types: Article
Subjects: global dimming and brightening, Meteorology. Climatology, QC851-999, global dimming and brightening; atmospheric radiation; clouds; shortwave irradiance; aerosols;, clouds, solar irradiance
The observed variability of shortwave (SW) irradiance, clouds and temperature and the potential connections between them is studied for the subarctic site Bergen (60.4°N, 5.3°E), located on the Norwegian west coast. Focusing on the quality and spatial representativity of the data, we compare observations from independent instruments and neighbouring measurement sites. The observations indicate that the decrease of sunshine duration and SW irradiance during the 1970s and 80s in Bergen is associated with the increasing frequency of clouds, in particular clouds of low base heights. We argue that the observed cloud changes are indicative of increased frequencies of storms in northern Europe. The annual mean observational time series show an increase in SW irradiance since 1990, which is not accompanied by a cloud cover (NN) decrease. This implies the influence of factors other than clouds, for example, decreasing aerosol emissions. Calculations of the aerosol optical depth (AOD) based on irradiance observations for hours when the sun is unobscured by clouds confirm a decreasing aerosol load after 1990, from 0.15 to 0.10 AOD which corresponds to 2–6 Wm−2 of brightening. At the same time, a seasonal analysis reveals opposite changes in SW irradiance and NN during the months of strongest changes – March, April and August – also during the recent period of increasing SW irradiance. We conclude that the seasonally decreasing NN also contributes to the recent changes in SW irradiance. Finally, we address the relationship between temperature, SW irradiance and clouds. In winter (December–February), the surface air temperature in Bergen is statistically linked to the warming influence of clouds. In all other seasons, the North Atlantic sea surface temperature variability has a more dominant influence on the air temperature in Bergen compared to local cloud and SW irradiance variability.Keywords: clouds, solar irradiance, global dimming and brightening(Published: 22 December 2014)Citation: Tellus B 2014, 66, 25897, http://dx.doi.org/10.3402/tellusb.v66.25897
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    • Alados-Arboledas, L., Olmo, F. J., Ohvril, H. O., Teral, H. and Arak, M. 1997. Evolution of solar radiative effects of Mount Pinatubo at ground level. Tellus B. 49, 190 198.
    • Booth, B. B. B., Dunstone, N. J., Halloran, P. R., Andrews, T. and Bellouin, N. 2012. Aerosols implicated as a prime driver of twentieth century North Atlantic climate variability. Nature. 484, 228 232.
    • Chiacchio, M. and Wild, M. 2010. Influence of NAO and clouds on long-term seasonal variations of surface solar radiation in Europe. J. Geophys. Res. 115, D00D22. DOI: 10.1029/ 2009JD012182.
    • Enfield, D. 2001. The Atlantic Multidecadal Oscillation and its relation to rainfall and river flows in the continental US. Geophys. Res. Lett. 28, 2077 2080.
    • Finsterle, W. 2011. WMO International Pyrheliometer Comparison IPC-XI. Technical Report 108, PMOD/WRC, Davos.
    • Fro¨ hlich, C. 2009. Evidence of a long-term trend in total solar irradiance. Astron. Astrophys. 501, L27 L30. DOI: 10.1051/ 0004-6361/200912318.
    • Gilgen, H., Wild, M. and Ohmura, A. 1998. Means and trends of shortwave irradiance at the surface estimated from global energy balance archive data. J. Clim. 11, 2042 2061. DOI: 10.1175/ 1520-0442-11.8.2042.
    • Gilgen, H., Roesch, A., Wild, M. and Ohmura, A. 2009. Decadal changes in shortwave irradiance at the surface in the period from 1960 to 2000 estimated from global energy balance archive data. J. Geophys. Res. 114, D00D08. DOI: 10.1029/2008JD011383.
    • Gueymard, C. A. 1998. Turbidity determination from broadband irradiance measurements: a detailed multicoefficient approach. J. Appl. Meteorol. 37, 414 435.
    • Gulev, S. K., Latif, M., Keenlyside, N. S., Park, W. and Koltermann, K. P. 2013. North Atlantic Ocean control on surface heat flux on multidecadal timescales. Nature. 499, 464 467.
    • Hanssen-Bauer, I. 1985. A simple model for diffusion of SO2 in Bergen. Atmos. Environ. 19, 415 422.
    • Hanssen-Bauer, I., Drange, H., Førland, E. J., Roald, L. A., Børsheim, K. Y. and co-authors. 2009. Klima i Norge 2100. Bakgrundsmateriale til NOU Klimatilpassing (Climate in Norway 2100. Background material for Norwegian Committee on Climate Change Adaptation), Norsk klimasenter, Oslo.
    • Iqbal, M. 1983. An Introduction to Solar Radiation. 1st ed. Academic Press, Ontario, Canada.
    • Kaplan, A., Cane, M. A., Kushnir, Y., Clement, A. C., Blumenthal, M. B. and co-authors. 1998. Analyses of global sea surface temperature 1856 1991. J. Geophys. Res. 103, 18567 18589.
    • Knudsen, M. F., Seidenkrantz, M.-S., Jacobsen, B. H. and Kuijpers, A. 2011. Tracking the Atlantic Multidecadal Oscillation through the last 8,000 years. Nat. Commun. 2, 178. DOI: 10.1038/ncomms1186.
    • 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(10), 61-1 61-4. DOI: 10.1029/ 2002GL014910.
    • Liley, J. B. 2009. New Zealand dimming and brightening. J. Geophys. Res. 114, D00D10. DOI: 10.1029/2008JD011401.
    • Luftforurensning. 2009. In Store norske leksikon (Norwegian Encyclopedia). Online at: http://snl.no/luftforurensning
    • Manney, G. L., Santee, M. L., Rex, M., Livesey, N. J., Pitts, M. C. and co-authors. 2011. Unprecedented Arctic ozone loss in 2011. Nature. 478, 469 475. DOI: 10.1038/nature10556.
    • Mayer, B. and Kylling, A. 2005. Technical note: the libRadtran software package for radiative transfer calculations-description and examples of use. Atmos. Chem. Phys. 5, 1855 1877.
    • Michalsky, J., Perez, R., Seals, R. and Ineichen, P. 1994. Degradation of solar concentration in the aftermath of Mount Pinatubo. Sol. Energ. 52, 205 213.
    • Norris, J. R. and Wild, M. 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.
    • Olseth, J. A. and Skartveit, A. 1993. Characteristics of hourly global irradiance modelled from cloud data. Sol. Energ. 51, 197 204.
    • Reda, I., Stoffel, T. and Myers, D. 2003. A method to calibrate a solar pyranometer for measuring reference diffuse irradiance. Sol. Energ. 74(2), 103 112.
    • Russak, V. 2009. Changes in solar radiation and their influence on temperature trend in Estonia (1955 2007). J. Geophys. Res. 114, D00D01. DOI: 10.1029/2008JD010613.
    • Smith, S. J., Conception, E., Andres, R. and Lurz, J. 2004. Historical Sulfur Dioxide Emissions 1850 2000: Methods and Results. PNNL-14537, Pacific Northwest National Laboratory, Richland, WA.
    • Stanhill, G. 2003. Through a glass brightly: some new light on the Campbell Stokes sunshine recorder. Weather. 58, 3 11.
    • Stanhill, G. and Cohen, S. 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. Agr. Forest Meteorol. 107(4), 255 278.
    • Stjern, C. W., Kristja´ nsson, J. E. and Hansen, A. W. 2009. Global dimming and global brightening an analysis of surface radiation and cloud cover data in northern Europe. Int. J. Clim. 29, 643 653.
    • Streets, D. G., Wu, Y. and Chin, M. 2006. Two-decadal aerosol trends as a likely explanation of the global dimming/brightening transition. Geophys. Res. Lett. 33(15). DOI: 10.1029/2006 GL026471.
    • Wild, M. 2009a. Global dimming and brightening: a review. J. Geophys. Res. 114, D00D16. DOI: 10.1029/2008JD011470.
    • Wild, M. 2009b. How well do IPCC-AR4/CMIP3 climate models simulate global dimming/brightening and twentieth-century daytime and nighttime warming? J. Geophys. Res. 114, D00D11. DOI: 10.1029/2008JD011372.
    • Wild, M. 2012. Enlightening global dimming and brightening. Bull. Am. Meteorol. Soc. 93(1), 27 37.
    • Wild, M., Gilgen, H., Roesch, A., Ohmura, A., Long, C. N. and co-authors. 2005. From dimming to brightening: decadal changes in solar radiation at Earth's surface. Science. 308, 847 850.
    • World Meteorological Organization. 2008. Observations of clouds. In: WMO Guide to Meteorological Instruments and Methods of Observations. Part I. Measurements of Meteorological Variables. World Meteorological Organization. WMO-NO.8, Geneva. 15-1 15-11.
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