Relationship between the sub-micron fraction in the context of AERONET retrievals

Relationship between the sub-micron fraction in the context of AERONET retrievals

The sub-micron (SM) aerosol optical depth (AOD) is an optical separation based on the fraction of particles below a specified cutoff radius of the particle size distribution (PSD) at a given particle radius. It is fundamentally different from spectrally separated FM (fine-mode) AOD. We present a sim...

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Bibliographic Details
Published in:Atmospheric measurement techniques Vol. 16; no. 4; pp. 1103 - 2205
Main Authors: O'Neill, Norman T, Ranjbar, Keyvan, IvÄnescu, Liviu, Eck, Thomas F, Reid, Jeffrey S, Giles, David M, Pérez-Ramírez, Daniel, Chaubey, Jai Prakash
Format: Journal Article
Language:English
Published: Copernicus GmbH 03-03-2023
Online Access:Get full text
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Summary:The sub-micron (SM) aerosol optical depth (AOD) is an optical separation based on the fraction of particles below a specified cutoff radius of the particle size distribution (PSD) at a given particle radius. It is fundamentally different from spectrally separated FM (fine-mode) AOD. We present a simple (AOD-normalized) SM fraction versus FM fraction (SMF vs. FMF) linear equation that explains the well-recognized empirical result of SMF generally being greater than the FMF. The AERONET inversion (AERinv) products (combined inputs of spectral AOD and sky radiance) and the spectral deconvolution algorithm (SDA) products (input of AOD spectra) enable, respectively, an empirical SMF vs. FMF comparison at similar (columnar) remote sensing scales across a variety of aerosol types.
ISSN:1867-1381