New Possibilities For Air Quality Monitoring From Space-Borne Remote Sensing: Application Of GRASP

Algorithm To S5p/TROPOMI and PRISMA MeasurementsPavel Litvinov1, Cheng Chen1, Oleg Dubovik2, David Fuertes1, Franco Migiletta3, Monica Pepe4, Lorenzo Genesio3, Lorenzo Busetto4 ,

Lukas Bindreiter5, Verena Lanzinger5, Petrut Cobarzan5 , Martin de Graaf6, Gijsbert Tilstra6 , P. Stammes6, and C. Retscher7

1 GRASP-SAS, Generalized Retrieval of Atmosphere and Surface Properties, France2 Laboratoire d'Optique Atmosphérique, CNRS, Université Lille-1, France

3 Institute of Bioeconomy,CNR, Sesto Fiorentino (FI), Italy4 Institute for Electromagnetic Sensing of the Environment,CNR, Milano, Italy

5 Cloudflight Austria GmbH, Linz, Austria6 KNMI, Utrechtseweg 297, 3731 GA De Bilt, The Netherlands

7 ESA, ESRIN, Largo Galileo Galilei 1, 00044 Frascati (RM), Italy

1. S5p/TROPOMI and PRISMA

S5P/TROPOMI provides global hyperspectral measure-ments in wide spectral range which can be beneficial foraerosol and surface characterization

PRISMA (PRecursore IperSpettrale della MissioneApplicativa) is an Italian Space Agency (ASI) hyperspectralmission with a swath width of 30 km and with a groundsampling distance of 30 m (hyperspectral), PRISMAmeasurements can be used for environment monitoring atregional scale but with high spatial resolution.

2. Approach for the combined retrievalØ GRASP Retrieval of S5p/TROPOMI measurements:

- Extended aerosol characterization for aerosol typing (size, absorption)

Ø GRASP/PRISMA retrieval :- Aerosol type information from GRASP/TROPOMI

retrieval- AOD retrieval at high (PRISMA) spatial resolution- Surface reflectance at high spatial resolution

3. AOD and surface reflectance at high resolutionfrom the combined retrieval

4. Conclusions and outlookØ Combination of the instruments with coarse and fine

spatial resolution (for example, S5p/TROPOMI andPRISMA) opens new possibilities for aerosol sourcesidentifications at high spatial resolution and aerosolemission/pollution monitoring.

Ø The retrieval from the instrument with coarse resolutionand global coverage can provide information aboutaerosol type and aerosol background.

Ø The retrieval from the sensor with fine spatial resolutioncan use this information to get AOD at high spatialresolution for identification of local aerosol sources andair quality monitoring.

Ø The combined retrieval provides enhanced surfacereflectance characterization at high spatial resolution.

Ø Developed GRASP methodology for the combinationPRISMA+S5p can potentially incorporate other satelliteslike S5p+S2 or S5p+OLCI+S2 etc.

GRASP/PRISMA AOD, 100 m pixel resolution, Venice, Italy

March 3, 2019 April 12, 2020

June 21, 2020 July 8, 2020

GRASP/PRISMA Surface Reflectance

Venice, July 8, 2020. 100 m pixel resolutionPRISMA TOA Reflectance

July 8, 2020