Preprint Article Version 1 This version is not peer-reviewed

Single Scattering Albedo’s Spectral Dependence Effect on UV Irradiance

Version 1 : Received: 25 June 2018 / Approved: 25 June 2018 / Online: 25 June 2018 (17:02:41 CEST)

How to cite: Raptis, I.; Kazadzis, S.; Eleftheratos, K.; Amiridis, V.; Fountoulakis, I. Single Scattering Albedo’s Spectral Dependence Effect on UV Irradiance. Preprints 2018, 2018060402 (doi: 10.20944/preprints201806.0402.v1). Raptis, I.; Kazadzis, S.; Eleftheratos, K.; Amiridis, V.; Fountoulakis, I. Single Scattering Albedo’s Spectral Dependence Effect on UV Irradiance. Preprints 2018, 2018060402 (doi: 10.20944/preprints201806.0402.v1).

Abstract

The Absorbing/scattering nature of aerosols affects the total radiative forcing and this absorption to total extinction ratio is quantified by single scattering albedo (SSA). Effect of SSA in the Ultraviolet (UV) irradiance is less studied and limited measurements are available. SSA retrieved at Athens, Greece during 2009-2014 from Ultraviolet Multifilter Radiometer (UVMFR) at 332 and 368 nm, were used to calculate incoming UV irradiance, alongside with ones from AERONET at visible wavelengths, from OMI satellite at 342.5 nm and from AEROCOM climatological database at 300 nm. UVA and UVB irradiances were estimated using a Radiative Transfer Model and we found that relative differences could be as high as 20%, while average relative differences varied from 2% to 8.7 % for the whole experimental period. Both UVA and UVB drop by a rate of ~12% for 0.05 aerosol absorption optical depth compared to ones estimated using SSA at visible range. Brewer irradiance measurements at 324nm were used to validate simulated irradiances and a better agreement was found when UVMFR SSAs were used with an average difference of 0.86%, while when using visible or climatological input, relative differences were estimated +4.91 and +4.15% accordingly.

Subject Areas

Solar Irradiance; SSA; Ultraviolet; Aerosols; Radiative Transfer; Absorption; UVA; UVB;

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