Assessment of Dust Size Retrievals Based on AERONET: A Case Study of Radiative Closure From Visible‐Near‐Infrared to Thermal Infrared - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2024

Assessment of Dust Size Retrievals Based on AERONET: A Case Study of Radiative Closure From Visible‐Near‐Infrared to Thermal Infrared

Jianyu Zheng
Zhibo Zhang
Sergio Desouza-Machado
  • Fonction : Auteur
Claire Ryder
Anne Garnier
Ping Yang
Ellsworth Welton
Hongbin Yu
  • Fonction : Auteur
Africa Barreto
  • Fonction : Auteur
Margarita Gonzalez
  • Fonction : Auteur

Résumé

Abstract Super‐coarse dust particles (diameters >10 μm) are evidenced to be more abundant in the atmosphere than model estimates and contribute significantly to the dust climate impacts. Since super‐coarse dust accounts for less dust extinction in the visible‐to‐near‐infrared (VIS‐NIR) than in the thermal infrared (TIR) spectral regime, they are suspected to be underestimated by remote sensing instruments operates only in VIS‐NIR, including Aerosol Robotic Networks (AERONET), a widely used data set for dust model validation. In this study, we perform a radiative closure assessment using the AERONET‐retrieved size distribution in comparison with the collocated Atmospheric Infrared Sounder (AIRS) TIR observations with comprehensive uncertainty analysis. The consistently warm bias in the comparisons suggests a potential underestimation of super‐coarse dust in the AERONET retrievals due to the limited VIS‐NIR sensitivity. An extra super‐coarse mode included in the AERONET‐retrieved size distribution helps improve the TIR closure without deteriorating the retrieval accuracy in the VIS‐NIR.
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hal-04581292 , version 1 (22-05-2024)

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Jianyu Zheng, Zhibo Zhang, Sergio Desouza-Machado, Claire Ryder, Anne Garnier, et al.. Assessment of Dust Size Retrievals Based on AERONET: A Case Study of Radiative Closure From Visible‐Near‐Infrared to Thermal Infrared. Geophysical Research Letters, 2024, 51 (4), ⟨10.1029/2023GL106808⟩. ⟨hal-04581292⟩
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