The Combined Effect of Ozone and Aerosols on Erythemal Irradiance in an Extremely Low Ozone Event during May 2020

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چکیده

In this study we focus on measurements and modeled UV index in the region of Athens, Greece, during a low ozone event. During period 12–19 May 2020, total column (TOC) showed extremely values, 35–55 Dobson Units (up to 15%) decrease from climatic mean (being lower than −2σ). This condition favors increase erythemal irradiance, since stratospheric is most important attenuator at UVB spectral region. Simultaneously, an intrusion Saharan dust aerosols has masked large part effect irradiance. order investigate event, have used solar irradiance Precision Solar Radiometer (PSR), TOC Brewer spectrophotometer, Radiative Transfer Model (RTM) calculations. calculations Index (UVI) ~30% compared long-term normal UVI due while same time for particular days, by ~20%. The RTM been response these variations different zenith angles (SZAs). Spectra simulated with measured ones average difference ~2% was found. points out importance accurate or forecasts both when deriving under unusual ozone–high aerosol conditions.

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ژورنال

عنوان ژورنال: Atmosphere

سال: 2021

ISSN: ['2073-4433']

DOI: https://doi.org/10.3390/atmos12020145