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\We present comparisons between estimates of the aerosol optical thickness and the Ångström exponent in Northern Norway and Svalbard based on data from AERONET (Aerosol Robotic Network) stations at Andenes (69.28° N, 16.01° E, 379m altitude) and Hornsund (77.00° N, 15.56° E, 10m altitude) for the period 2008-2011. The four-year annual mean values for the aerosol optical thickness at 500nm °(500) at Andenes and Hornsund both were 0.10. At Hornsund, there was less variation of the monthly mean value of °(500) than at Andenes. The annual mean values of the Ångström exponent ° at Andenes and Hornsund were 1.25 and 1.37, respectively. At Andenes and Hornsund ° was found to be larger than 1.1 in 64% and 86% of the observations, respectively, indicating that fine-mode particles were dominating at both sites. Both sites had a similar seasonal variation of the aerosol size distribution although one site is in an arctic area while the other site is in a sub-arctic area. [ABSTRACT FROM AUTHOR]

The article presents a study on the aerosol optical thickness and the Ångström exponent in Northern Norway and Svalbard. The study involved data from AERONET stations at Andenes and Hornsund from 2008 to 2010. The result showed that the annual mean values of the Ångström α exponent at Andenes and Hornsund were 1.18 and 1.37, respectively.