Relationship between the sub-micron fraction (SMF) and fine-mode fraction (FMF) 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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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00065294 2023-05-15T15:15:25+02:00 Relationship between the sub-micron fraction (SMF) and fine-mode fraction (FMF) in the context of AERONET retrievals O'Neill, Norman T. Ranjbar, Keyvan Ivănescu, Liviu Eck, Thomas F. Reid, Jeffrey S. Giles, David M. Pérez-Ramírez, Daniel Chaubey, Jai Prakash 2023-03 electronic https://doi.org/10.5194/amt-16-1103-2023 https://noa.gwlb.de/receive/cop_mods_00065294 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00063855/amt-16-1103-2023.pdf https://amt.copernicus.org/articles/16/1103/2023/amt-16-1103-2023.pdf eng eng Copernicus Publications Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-16-1103-2023 https://noa.gwlb.de/receive/cop_mods_00065294 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00063855/amt-16-1103-2023.pdf https://amt.copernicus.org/articles/16/1103/2023/amt-16-1103-2023.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/amt-16-1103-2023 2023-03-06T00:14:56Z 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. SMF (AERinv-derived) vs. FMF (SDA-derived) behavior is primarily dependent on the relative truncated portion (εc) of the coarse-mode (CM) AOD associated with the cutoff portion of the CM PSD and, to a second order, the cutoff FM PSD and FM AOD (εf). The SMF vs. FMF equation largely explains the SMF vs. FMF behavior of the AERinv vs. SDA products as a function of PSD cutoff radius (“inflection point”) across an ensemble of AERONET sites and aerosol types (urban-industrial, biomass burning, dust, maritime and a mixed class of Arctic aerosols). The overarching dynamic was that the linear SMF vs. FMF relation pivots clockwise about the approximate (SMF, FMF) singularity of (1, 1) in a “linearly inverse” fashion (slope and intercept of approximately 1−εc and εc) with increasing cutoff radius. SMF vs. FMF slopes and intercepts derived from AERinv and SDA retrievals confirmed the general domination of εc over εf in controlling that dynamic. A more general conclusion is the apparent confirmation that the optical impact of truncating modal (whole) PSD features can be detected by an SMF vs. FMF analysis. Article in Journal/Newspaper Arctic Niedersächsisches Online-Archiv NOA Arctic Atmospheric Measurement Techniques 16 4 1103 1120 |
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Niedersächsisches Online-Archiv NOA |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung O'Neill, Norman T. Ranjbar, Keyvan Ivănescu, Liviu Eck, Thomas F. Reid, Jeffrey S. Giles, David M. Pérez-Ramírez, Daniel Chaubey, Jai Prakash Relationship between the sub-micron fraction (SMF) and fine-mode fraction (FMF) in the context of AERONET retrievals |
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article Verlagsveröffentlichung |
description |
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. SMF (AERinv-derived) vs. FMF (SDA-derived) behavior is primarily dependent on the relative truncated portion (εc) of the coarse-mode (CM) AOD associated with the cutoff portion of the CM PSD and, to a second order, the cutoff FM PSD and FM AOD (εf). The SMF vs. FMF equation largely explains the SMF vs. FMF behavior of the AERinv vs. SDA products as a function of PSD cutoff radius (“inflection point”) across an ensemble of AERONET sites and aerosol types (urban-industrial, biomass burning, dust, maritime and a mixed class of Arctic aerosols). The overarching dynamic was that the linear SMF vs. FMF relation pivots clockwise about the approximate (SMF, FMF) singularity of (1, 1) in a “linearly inverse” fashion (slope and intercept of approximately 1−εc and εc) with increasing cutoff radius. SMF vs. FMF slopes and intercepts derived from AERinv and SDA retrievals confirmed the general domination of εc over εf in controlling that dynamic. A more general conclusion is the apparent confirmation that the optical impact of truncating modal (whole) PSD features can be detected by an SMF vs. FMF analysis. |
format |
Article in Journal/Newspaper |
author |
O'Neill, Norman T. Ranjbar, Keyvan Ivănescu, Liviu Eck, Thomas F. Reid, Jeffrey S. Giles, David M. Pérez-Ramírez, Daniel Chaubey, Jai Prakash |
author_facet |
O'Neill, Norman T. Ranjbar, Keyvan Ivănescu, Liviu Eck, Thomas F. Reid, Jeffrey S. Giles, David M. Pérez-Ramírez, Daniel Chaubey, Jai Prakash |
author_sort |
O'Neill, Norman T. |
title |
Relationship between the sub-micron fraction (SMF) and fine-mode fraction (FMF) in the context of AERONET retrievals |
title_short |
Relationship between the sub-micron fraction (SMF) and fine-mode fraction (FMF) in the context of AERONET retrievals |
title_full |
Relationship between the sub-micron fraction (SMF) and fine-mode fraction (FMF) in the context of AERONET retrievals |
title_fullStr |
Relationship between the sub-micron fraction (SMF) and fine-mode fraction (FMF) in the context of AERONET retrievals |
title_full_unstemmed |
Relationship between the sub-micron fraction (SMF) and fine-mode fraction (FMF) in the context of AERONET retrievals |
title_sort |
relationship between the sub-micron fraction (smf) and fine-mode fraction (fmf) in the context of aeronet retrievals |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/amt-16-1103-2023 https://noa.gwlb.de/receive/cop_mods_00065294 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00063855/amt-16-1103-2023.pdf https://amt.copernicus.org/articles/16/1103/2023/amt-16-1103-2023.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
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Arctic |
genre_facet |
Arctic |
op_relation |
Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-16-1103-2023 https://noa.gwlb.de/receive/cop_mods_00065294 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00063855/amt-16-1103-2023.pdf https://amt.copernicus.org/articles/16/1103/2023/amt-16-1103-2023.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/amt-16-1103-2023 |
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Atmospheric Measurement Techniques |
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16 |
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4 |
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1103 |
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1120 |
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1766345787261845504 |