Retrieval of aerosol properties using ...
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Title :
Retrieval of aerosol properties using relative radiance measurements from an all-sky camera
Author(s) :
Roman, Roberto [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Antuna-Sanchez, Juan C. [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Cachorro, Victoria E. [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Toledano, Carlos [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Torres, Benjamin [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Mateos, David [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Fuertes, David [Auteur]
Université de Lille
Lopez, César [Auteur]
Gonzalez, Ramiro [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Lapionok, Tatyana [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Herreras Giralda, Marcos [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Université de Lille
Doubovik, Oleg [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
De Frutos, Angel M. [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Universidad de Valladolid [Valladolid] [UVa]
Antuna-Sanchez, Juan C. [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Cachorro, Victoria E. [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Toledano, Carlos [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Torres, Benjamin [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Mateos, David [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Fuertes, David [Auteur]
Université de Lille
Lopez, César [Auteur]
Gonzalez, Ramiro [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Lapionok, Tatyana [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Herreras Giralda, Marcos [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Université de Lille
Doubovik, Oleg [Auteur]

Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
De Frutos, Angel M. [Auteur]
Universidad de Valladolid [Valladolid] [UVa]
Journal title :
Atmospheric Measurement Techniques
Abbreviated title :
Atmos. Meas. Tech.
Volume number :
15
Pages :
-
Publication date :
2022-02-13
ISSN :
1867-1381
HAL domain(s) :
Planète et Univers [physics]/Océan, Atmosphère
English abstract : [en]
This paper explores the potential of all-sky cameras to retrieve aerosol properties with the GRASP code (Generalized Retrieval of Atmosphere and Surface Properties). To this end, normalized sky radiances (NSRs) extracted ...
Show more >This paper explores the potential of all-sky cameras to retrieve aerosol properties with the GRASP code (Generalized Retrieval of Atmosphere and Surface Properties). To this end, normalized sky radiances (NSRs) extracted from an all-sky camera at three effective wavelengths (467, 536 and 605 nm) are used in this study. NSR observations are a set of relative (uncalibrated) sky radiances in arbitrary units. NSR observations have been simulated for different aerosol loads and types with the forward radiative transfer module of GRASP, indicating that NSR observations contain information about the aerosol type, as well as about the aerosol optical depth (AOD), at least for low and moderate aerosol loads. An additional sensitivity study with synthetic data has been carried out to quantify the theoretical accuracy and precision of the aerosol properties (AOD, size distribution parameters, etc.) retrieved by GRASP using NSR observations as input. As a result, the theoretical accuracy of AOD is within ±0.02 for AOD values lower than or equal to 0.4, while the theoretical precision goes from 0.01 to 0.05 when AOD at 467 nm varies from 0.1 to 0.5. NSR measurements recorded at Valladolid (Spain) with an all-sky camera for more than 2 years have been inverted with GRASP. The retrieved aerosol properties are compared with independent values provided by co-located AERONET (AErosol RObotic NETwork) measurements. AODs from both data sets correlate with determination coefficient (r2) values of about 0.87. Finally, the novel multi-pixel approach of GRASP is applied to daily camera radiances together by constraining the temporal variation in certain aerosol properties. This temporal linkage (multi-pixel approach) provides promising results, reducing the highly temporal variation in some aerosol properties retrieved with the standard (one by one or single-pixel) approach. This work implies an advance in the use of all-sky cameras for the retrieval of aerosol properties.Show less >
Show more >This paper explores the potential of all-sky cameras to retrieve aerosol properties with the GRASP code (Generalized Retrieval of Atmosphere and Surface Properties). To this end, normalized sky radiances (NSRs) extracted from an all-sky camera at three effective wavelengths (467, 536 and 605 nm) are used in this study. NSR observations are a set of relative (uncalibrated) sky radiances in arbitrary units. NSR observations have been simulated for different aerosol loads and types with the forward radiative transfer module of GRASP, indicating that NSR observations contain information about the aerosol type, as well as about the aerosol optical depth (AOD), at least for low and moderate aerosol loads. An additional sensitivity study with synthetic data has been carried out to quantify the theoretical accuracy and precision of the aerosol properties (AOD, size distribution parameters, etc.) retrieved by GRASP using NSR observations as input. As a result, the theoretical accuracy of AOD is within ±0.02 for AOD values lower than or equal to 0.4, while the theoretical precision goes from 0.01 to 0.05 when AOD at 467 nm varies from 0.1 to 0.5. NSR measurements recorded at Valladolid (Spain) with an all-sky camera for more than 2 years have been inverted with GRASP. The retrieved aerosol properties are compared with independent values provided by co-located AERONET (AErosol RObotic NETwork) measurements. AODs from both data sets correlate with determination coefficient (r2) values of about 0.87. Finally, the novel multi-pixel approach of GRASP is applied to daily camera radiances together by constraining the temporal variation in certain aerosol properties. This temporal linkage (multi-pixel approach) provides promising results, reducing the highly temporal variation in some aerosol properties retrieved with the standard (one by one or single-pixel) approach. This work implies an advance in the use of all-sky cameras for the retrieval of aerosol properties.Show less >
Language :
Anglais
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
CNRS
Collections :
Submission date :
2024-01-16T22:39:16Z
2024-02-07T14:56:56Z
2024-02-07T14:56:56Z
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