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https://doi.org/10.5194/amt-2020-121
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-121
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 15 Jun 2020

Submitted as: research article | 15 Jun 2020

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This preprint is currently under review for the journal AMT.

Validation of TROPOMI Surface UV Radiation Product

Kaisa Lakkala1,2, Jukka Kujanpää1, Colette Brogniez3, Nicolas Henriot3, Antti Arola2, Margit Aun2,4, Frédérique Auriol3, Alkiviadis F. Bais5, Germar Bernhard6, Veerle De Bock7, Maxime Catalfamo3, Christine Deroo3, Henri Diémoz8,9, Luca Egli10, Jean-Baptiste Forestier11, Ilias Fountoulakis8, Rosa Delia Garcia12,13, Julian Gröbner10, Seppo Hassinen1, Anu Heikkilä2, Stuart Henderson14, Gregor Hülsen10, Bjørn Johnsen15, Niilo Kalakoski1, Angelos Karanikolas5, Tomi Karppinen1, Kevin Lamy11, Sergio F. León-Luis13, Anders V. Lindfors16, Jean-Marc Metzger17, Fanny Minvielle3, Harel B. Muskatel18, Thierry Portafaix11, Alberto Redondas13, Ricardo Sanchez19, Anna Maria Siani20, Tove Svendby21, and Johanna Tamminen1 Kaisa Lakkala et al.
  • 1Finnish Meteorological Institute, Space and Earth Observation Centre
  • 2Finnish Meteorological Institute, Climate Research Programme
  • 3Univ. Lille, CNRS, UMR 8518, Laboratoire D'Optique Atmosphérique, Lille, France
  • 4University of Tartu, Estonia
  • 5Aristotle University of Thessaloniki, Greece
  • 6Biospherical Instruments, Inc, San Diego, U.S.
  • 7Royal Meteorological Institute of Belgium, Brussels, Belgium
  • 8Aosta Valley Regional Environmental Protection Agency (ARPA), Saint-Christophe, Italy
  • 9Institute of Atmospheric Science and Climate, ISAC-CNR, Rome, Italy
  • 10Physical Meteorological Observatory in Davos - World Radiation Center, Switzerland
  • 11LACy, Laboratoire de l’Atmosphère et des Cyclones (UMR 8105 CNRS, Université de La Réunion, Météo-France), Saint-Denis, Reunion Island, France
  • 12Atmospheric Optics Group, Valladolid University, Valladolid, Spain
  • 13Izaña Atmospheric Research Center (IARC), State Meteorological Agency (AEMET), Spain
  • 14Australian Radiation Protection And Nuclear Safety Agency
  • 15Norwegian Radiation and Nuclear Safety Authority, Norway
  • 16Finnish Meteorological Institute, Meteorological and Marine Research Programme
  • 17Observatoire des Sciences de l’Univers de La Réunion, UMS3365 (CNRS, Université de La Réunion, Météo-France), Saint-Denis de la Réunion, France
  • 18Israel Meteorological Service
  • 19National Meteorological Service, Argentina
  • 20Sapienza Università di Roma, Italy
  • 21NILU - Norwegian Institute for Air Research, Norway

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 x 3.5 km2 (5.6 x 3.5 km2 since 6 August 2019) at nadir. The Finnish Meteorological Institute (FMI) is responsible for the development and 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 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 % from 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 clear sky TROPOMI data were within ±20 % from ground-based measurements. Generally median relative differences between TROPOMI data and ground-based measurements were a little biased towards negative values, but at high latitudes where non-homogeneous topography and albedo/snow conditions occurred, the negative bias was exceptionally high, from −30 % to −65 %. Positive biases of 10–15 % were also found for mountainous sites due to challenging topography. The TROPOMI Surface UV Radiation Product includes quality flags to detect increased uncertainties in the data due to heterogeneous surface albedo and rough terrain which can be used to filter the data retrieved under challenging conditions.

Kaisa Lakkala et al.

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Short summary
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. Ground-based data from 25 sites located in arctic, subarctic, temperate, equatorial and antarctic areas were used for validation of the TROPOMI Surface Ultraviolet (UV) Radiation Product. For most sites 60–80 % of TROPOMI data was within ±20 % from ground-based data.
The TROPOspheric Monitoring Instrument (TROPOMI) onboard the Sentinel-5 Precursor (S5P)...
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