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Comparison of satellite-derived with ground-based PAR measurements at Lampedusa island (Central Mediterranean) and the impact of the aerosol optical depth

TitleComparison of satellite-derived with ground-based PAR measurements at Lampedusa island (Central Mediterranean) and the impact of the aerosol optical depth
Publication TypePresentazione a Congresso
Year of Publication2024
AuthorsMeloni, Daniela, Trentmann Jörg, Pfeifroth Uwe, Di Sarra Alcide, and Trisolino P.
Conference NameRADIATION PROCESSES IN THE ATMOSPHERE AND OCEAN
Date Published2024
PublisherAIP Publishing
Conference LocationThessaloniki, Greece
Abstract

This study presents the comparison of the EUMETSAT CM SAF SARAH version 3 climate data record of global Photosynthetically Active Radiation (PAR) with ground-based measurements collected at the ENEA Climate Observatory on the island of Lampedusa, in the Central Mediterranean. The analysis is carried out with daily averages in the period 2006-2018 and takes into account all-sky and cloud-free conditions, allowing to assess the role of the aerosol optical depth (AOD) on the observed differences among the two datasets. SARAH-3 PAR under all-sky conditions show a very good agreement with ground-based measurements, with a mean bias and one standard deviation of (1.0±24.7) μmol m-2s-1 or (1.1±8.1)%. Under cloud-free conditions, the results show an overall underestimation of SARAH-3 PAR data, with a mean bias and one standard deviation of (-9.1±26.8) μmol m-2s-1 or (-1.6±4.3)%. The differences may be explained with the AOD climatological values assumed in the SARAH-3 retrieval, which in most cases overestimate the ground-based AOD measurements. The outcomes of this study confirm the reliability of SARAH-3 daily PAR estimates and the importance of the validation process in order to assess the impact of the AOD used in the satellite retrieval. © 2024 Author(s).

URLhttps://pubs.aip.org/aip/acp/article-lookup/doi/10.1063/5.0183467
DOI10.1063/5.0183467
Citation Key12202