Evidence for the 3D radiative effects of boundary-layer clouds from observations of direct and diffuse surface solar fluxes - Département de mécanique Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2021

Evidence for the 3D radiative effects of boundary-layer clouds from observations of direct and diffuse surface solar fluxes

Résumé

Numerical experiments have revealed the importance of horizontal transport of light in the presence of clouds (“3D effects”), with consequences for climate, weather, and solar resource availability predictions. Yet, analysis of 3D effects from observations remain sparse because of the difficulty to isolate the effect of horizontal transport in radiation measurements. In this study, we provide observational evidence for 3D effects based on the direct-diffuse partition of surface solar fluxes. It is compared to outputs from the ecRad radiative transfer scheme run on retrieved cloud profiles. The direct-beam calculation takes careful account of the field-of-view of the pyrheliometer to ensure consistency between observed and modeled direct fluxes. Only the solver that accounts for 3D effects is able to reproduce the observed mean direct-diffuse partition as a function of solar zenith angle and cloud cover, in particular at large solar zenith angles where cloud sides intercept most of the direct beam.
Fichier principal
Vignette du fichier
Villefranque et Hogan - 2021 - Evidence for the 3D Radiative Effects of Boundary-.pdf (672.61 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03564225 , version 1 (10-02-2022)

Identifiants

Citer

Najda Villefranque, Robin J Hogan. Evidence for the 3D radiative effects of boundary-layer clouds from observations of direct and diffuse surface solar fluxes. Geophysical Research Letters, 2021, 48 (14), ⟨10.1029/2021GL093369⟩. ⟨hal-03564225⟩
33 Consultations
73 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More