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. In order to assess the evolution of aerosol parameters affecting climatechange, a long-term trend analysis of aerosol optical properties wasperformed on time series from 52 stations situated across five continents.The time series of measured scattering, backscattering and absorptioncoefficients as well as the derived single scattering albedo, backscatteringfraction, scattering and absorption Angstrom exponents covered atleast 10 years and up to 40 years for some stations. The non-parametricseasonal Mann–Kendall (MK) statistical test associated with severalpre-whitening methods and with Sen's slope was used as the main trend analysis method. Comparisons with general least mean square associated with autoregressive bootstrap (GLS/ARB) and with standard least mean square analysis (LMS) enabled confirmation of the detected MK statisticallysignificant trends and the assessment of advantages and limitations of eachmethod. Currently, scattering and backscattering coefficient trends aremostly decreasing in Europe and North America and are not statisticallysignificant in Asia, while polar stations exhibit a mix of increasing anddecreasing trends. A few increasing trends are also found at some stationsin North America and Australia. Absorption coefficient time series alsoexhibit primarily decreasing trends. For single scattering albedo, 52 % ofthe sites exhibit statistically significant positive trends, mostly in Asia,eastern/northern Europe and the Arctic, 22 % of sites exhibit statistically significant negative trends, mostly in central Europe and central NorthAmerica, while the remaining 26 % of sites have trends which are not statistically significant. In addition to evaluating trends for the overalltime series, the evolution of the trends in sequential 10-year segments was also analyzed. For scattering and backscattering, statistically significantincreasing 10-year trends are primarily found for earlier periods (10-year trends ending in 2010–2015) for polar stations and Mauna Loa. For most ofthe stations, the present-day statistically significant decreasing 10-year trends of the single scattering albedo were preceded by not statisticallysignificant and statistically significant increasing 10-year trends. The effect of air pollution abatement policies in continental North America isvery obvious in the 10-year trends of the scattering coefficient – there is a shift to statistically significant negative trends in 2009–2012 for allstations in the eastern and central USA. This long-term trend analysis of aerosol radiative properties with a broad spatial coverage provides insightinto potential aerosol effects on climate changes.

Multidecadal trend analysis of in situ aerosol radiative properties around the world