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  • 1.
    Burgos, María A.
    et al.
    Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
    Andrews, Elisabeth
    Titos, Gloria
    Alados-Arboledas, Lucas
    Baltensperger, Urs
    Day, Derek
    Jefferson, Anne
    Kalivitis, Nikos
    Mihalopoulos, Nikos
    Sherman, James
    Sun, Junying
    Weingartner, Ernest
    Zieger, Paul
    Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
    A global view on the effect of water uptake on aerosol particle light scattering2019In: Scientific Data, E-ISSN 2052-4463, Vol. 6, article id 157Article in journal (Refereed)
    Abstract [en]

    A reference dataset of multi-wavelength particle light scattering and hemispheric backscattering coefficients for different relative humidities (RH) between RH = 30 and 95% and wavelengths between lambda = 450 nm and 700 nm is described in this work. Tandem-humidified nephelometer measurements from 26 ground-based sites around the globe, covering multiple aerosol types, have been re-analysed and harmonized into a single dataset. The dataset includes multi-annual measurements from long-term monitoring sites as well as short-term field campaign data. The result is a unique collection of RH-dependent aerosol light scattering properties, presented as a function of size cut. This dataset is important for climate and atmospheric model-measurement inter-comparisons, as a means to improve model performance, and may be useful for satellite and remote sensing evaluation using surface-based, in-situ measurements.

  • 2. Ritter, C.
    et al.
    Angeles Burgos, Maria
    Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry. Universidad de Valladolid, Spain.
    Böckmann, C.
    Mateos, D.
    Lisok, J.
    Markowicz, K. M.
    Moroni, B.
    Cappelletti, D.
    Udisti, R.
    Maturilli, M.
    Neuber, R.
    Microphysical properties and radiative impact of an intense biomass burning aerosol event measured over Ny-angstrom lesund, Spitsbergen in July 20152018In: Tellus. Series B, Chemical and physical meteorology, ISSN 0280-6509, E-ISSN 1600-0889, Vol. 70, article id 1445379Article in journal (Refereed)
    Abstract [en]

    In this work, an evaluation of an intense biomass burning event observed over Ny-angstrom lesund (Spitsbergen, European Arctic) in July 2015 is presented. Data from the multi-wavelengths Raman-lidar KARL, a sun photometer and radiosonde measurements are used to derive some microphysical properties of the biomass burning aerosol as size distribution, refractive index and single scattering albedo at different relative humidities. Predominantly particles in the accumulation mode have been found with a bi-modal distribution and dominance of the smaller mode. Above 80% relative humidity, hygroscopic growth in terms of an increase of particle diameter and a slight decrease of the index of refraction (real and imaginary part) has been found. Values of the single scattering albedo around 0.9 both at 355nm and 532nm indicate some absorption by the aerosol. Values of the lidar ratio are around 26sr for 355nm and around 50sr for 532nm, almost independent of the relative humidity. Further, data from the photometer and surface radiation values from the local baseline surface radiation network (BSRN) have been applied to derive the radiative impact of the biomass burning event purely from observational data by comparison with a clear background day. We found a strong cooling for the visible radiation and a slight warming in the infra-red. The net aerosol forcing, derived by comparison with a clear background day purely from observational data, obtained a value of -95 W/m(2) per unit AOD500.

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