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Statistical validation of Aeolus L2A particle backscatter coefficient retrievals over ACTRIS/EARLINET stations on the Iberian Peninsula

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cris.lastimport.scopus2024-02-12T20:12:02Z
dc.abstract.enThe Global Observing System (GOS) has encountered some limitations due to a lack of worldwide real-time wind measurements. In this context, the European Space Agency (ESA) has developed the Aeolus satel- lite mission, based on the ALADIN (Atmospheric Laser Doppler Instrument) Doppler wind lidar; this mission aims to obtain near-real-time wind retrievals at the global scale. As spin-off products, the instrument retrieves aerosol optical properties such as particle backscatter and extinction coefficients. In this work, a validation of Ae- olus reprocessed (baseline 10) co-polar backscatter coefficients (βpart Aeolus) is presented through an intercomparison with analogous ground-based measurements taken at the ACTRIS (Aerosols, Clouds and Trace gases Research InfraStructure Network)/EARLINET (European Aerosol Research Lidar Network) stations of Granada (Spain), Évora (Portugal) and Barcelona (Spain) over the period from July 2019 until October 2020. Case studies are first presented, followed by a statistical analysis. The stations are located in a hot spot between Africa and the rest of Europe, which guarantees a variety of aerosol types, from mineral dust layers to continental/anthropogenic aerosol, and allows us to test Aeolus performance under different scenarios. The so called Aeolus-like pro- files (βpart Aeolus like,355) are obtained from total particle backscatter coefficient and linear particle depolarization ratio (δpart linear) profiles at 355 and 532 nm measured from the surface, through a thorough bibliographic review of dual-polarization measurements for relevant aerosol types. Finally, the study proposes a relation for the spectral conversion of δpart linear, which is implemented in the Aeolus-like profile calculation. The statistical results show the ability of the satellite to detect and characterize significant aerosol layers under cloud-free conditions, along with the surface effect on the lowermost measurements, which causes the satellite to largely overestimate co- polar backscatter coefficients. Finally, the Aeolus standard correct algorithm middle bin (SCAmb) shows a better agreement with ground-based measurements than the standard correct algorithm (SCA), which tends to retrieve negative and meaningless coefficients in the clear troposphere. The implementation of Aeolus quality flags entails a vast reduction in the number of measurements available for comparison, which affects the statistical significance of the results.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorAlados-Arboledas, Lucas
dc.contributor.authorSicard, Michaël
dc.contributor.authorBermejo-Pantaleón, Diego
dc.contributor.authorBortoli, Daniele
dc.contributor.authorGranados-Muñoz, María José
dc.contributor.authorGuerrero-Rascado, Juan Luis
dc.contributor.authorCosta, Maria João
dc.contributor.authorBravo-Aranda, Juan Antonio
dc.contributor.authorRodríguez-Gómez, Alejandro
dc.contributor.authorJiménez-Martín, Marta María
dc.contributor.authorMuñoz-Porcar, Constantino
dc.contributor.authorAbril-Gago, Jesús
dc.contributor.authorComerón, Adolfo
dc.contributor.authorSalgueiro, Vanda
dc.contributor.authorAmezcua, Pablo Ortiz
dc.date.accessioned2024-01-26T08:08:40Z
dc.date.available2024-01-26T08:08:40Z
dc.date.issued2022
dc.description.financePublikacja bezkosztowa
dc.description.number2
dc.description.volume22
dc.identifier.doi10.5194/ACP-22-1425-2022
dc.identifier.issn1680-7316
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/120666
dc.identifier.weblinkhttps://acp.copernicus.org/articles/22/1425/2022/acp-22-1425-2022.pdf
dc.languageeng
dc.pbn.affiliationearth and related environmental sciences
dc.relation.ispartofAtmospheric Chemistry and Physics
dc.relation.pages1425-1451
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleStatistical validation of Aeolus L2A particle backscatter coefficient retrievals over ACTRIS/EARLINET stations on the Iberian Peninsula
dc.typeJournalArticle
dspace.entity.typePublication