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Validation of the TROPOspheric Monitoring Instrument (TROPOMI) surface UV radiation product

Kaisa Lakkala 1 Jukka Kujanpää 1 Colette Brogniez 2 Nicolas Henriot 2 Antti Arola 3 Margit Aun 3 Frédérique Auriol 2 Alkiviadis Bais 4 Germar Bernhard 5 Veerle de Bock 6 Maxime Catalfamo 2 Christine Deroo 2 Henri Diémoz 7, 8 Luca Egli 9 Jean-Baptiste Forestier 10 Ilias Fountoulakis 7 Katerina Garane 4 Rosa Garcia 11 Julian Gröbner 9 Seppo Hassinen 1 Anu Heikkilä 3 Stuart Henderson 12 Gregor Hülsen 9 Bjørn Johnsen 13 Niilo Kalakoski 1 Angelos Karanikolas 4 Tomi Karppinen 1 Kevin Lamy 10 Sergio León-Luis 14 Anders Lindfors 3 Jean-Marc Metzger 15 Fanny Minvielle 2 Harel Muskatel 16 Thierry Portafaix 10 Alberto Redondas 14 Ricardo Sanchez Anna Siani 17 Tove Svendby 18 Johanna Tamminen 1
Abstract : The TROPOspheric Monitoring Instrument (TROPOMI) onboard the Sentinel-5 Precursor (S5P) satellite was launched on 13 October 2017 to provide the atmospheric composition for atmosphere and climate research. The S5P is a Sun-synchronous polar-orbiting satellite providing global daily coverage. The TROPOMI swath is 2600 km wide, and the ground resolution for most data products is 7:2 3:5 km2 (5:6 3:5 km2 since 6 August 2019) at nadir. The Finnish Meteorological Institute (FMI) is responsible for the development of the TROPOMI UV algorithm and the processing of the TROPOMI surface ultraviolet (UV) radiation product which includes 36 UV parameters in total. Ground-based data from 25 sites located in arctic, subarctic, temperate, equatorial and Antarctic areas were used for validation of the TROPOMI overpass irradiance at 305, 310, 324 and 380 nm, overpass erythemally weighted dose rate/UV index, and erythemally weighted daily dose for the period from 1 January 2018 to 31 August 2019. The validation results showed that for most sites 60 %–80% of TROPOMI data was within 20% of ground-based data for snow-free surface conditions. The median relative differences to ground-based measurements of TROPOMI snow-free surface daily doses were within 10% and 5% at two-thirds and at half of the sites, respectively. At several sites more than 90% of cloud-free TROPOMI data was within 20% of groundbased measurements. Generally median relative differences between TROPOMI data and ground-based measurements were a little biased towards negative values (i.e. satellite data
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https://hal.univ-reunion.fr/hal-03132348
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Kaisa Lakkala, Jukka Kujanpää, Colette Brogniez, Nicolas Henriot, Antti Arola, et al.. Validation of the TROPOspheric Monitoring Instrument (TROPOMI) surface UV radiation product. Atmospheric Measurement Techniques, European Geosciences Union, 2020, 13, pp.6999 - 7024. ⟨10.5194/amt-13-6999-2020⟩. ⟨hal-03132348⟩

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