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.
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18 January 2024
RADIATION PROCESSES IN THE ATMOSPHERE AND OCEAN
4–8 July 2022
Thessaloniki, Greece
Research Article|
January 18 2024
Comparison of satellite-derived with ground-based PAR measurements at Lampedusa island (Central Mediterranean) and the impact of the aerosol optical depth
Daniela Meloni;
Daniela Meloni
a)
1
ENEA, Laboratory for Observations and Measurements for Environment and Climate
, Via Anguillarese 301, Rome, Italy
a)Corresponding author: [email protected]
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Jörg Trentmann;
Jörg Trentmann
b)
2
Deutscher Wetterdienst
, Frankfurter Strasse 135, Offenbach, Germany
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Uwe Pfeifroth;
Uwe Pfeifroth
c)
2
Deutscher Wetterdienst
, Frankfurter Strasse 135, Offenbach, Germany
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Alcide di Sarra;
Alcide di Sarra
d)
1
ENEA, Laboratory for Observations and Measurements for Environment and Climate
, Via Anguillarese 301, Rome, Italy
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Pamela Trisolino
Pamela Trisolino
e)
3
CNR, Institute of Atmospheric Sciences and Climate
, Via P. Gobetti 101, Bologna, Italy
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a)Corresponding author: [email protected]
AIP Conf. Proc. 2988, 110001 (2024)
Citation
Daniela Meloni, Jörg Trentmann, Uwe Pfeifroth, Alcide di Sarra, Pamela Trisolino; Comparison of satellite-derived with ground-based PAR measurements at Lampedusa island (Central Mediterranean) and the impact of the aerosol optical depth. AIP Conf. Proc. 18 January 2024; 2988 (1): 110001. https://doi.org/10.1063/5.0183467
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