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...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus
2023
|
Subjects: | |
Online Access: | https://hdl.handle.net/10481/80799 https://doi.org/10.5194/amt-16-1103-2023 |
id |
ftunivgranada:oai:digibug.ugr.es:10481/80799 |
---|---|
record_format |
openpolar |
spelling |
ftunivgranada:oai:digibug.ugr.es:10481/80799 2023-06-11T04:09:53+02:00 Relationship between the sub-micron fraction (SMF) and fine-mode fraction (FMF) in the context of AERONET retrievals O'Neill, Norman T. Pérez Ramírez, Daniel 2023-03-03 https://hdl.handle.net/10481/80799 https://doi.org/10.5194/amt-16-1103-2023 eng eng Copernicus O'Neill, N. T. [et al.]. Relationship between the sub-micron fraction (SMF) and fine-mode fraction (FMF) in the context of AERONET retrievals, Atmos. Meas. Tech., 16, 1103–1120, [https://doi.org/10.5194/amt-16-1103-2023], 2023. https://hdl.handle.net/10481/80799 doi:10.5194/amt-16-1103-2023 Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 ftunivgranada https://doi.org/10.5194/amt-16-1103-202310.5194/amt-16-1103-2023] 2023-04-18T23:28:30Z 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 (epsilon(c)) 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 (epsilon(f)). 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-epsilon(c) and epsilon(c)) with increasing cutoff radius. SMF vs. FMF slopes and intercepts derived from AERinv and SDA retrievals confirmed the general domination of epsilon(c) over epsilon f 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. GSFC/NASA AERONET project CANDAC (the Canadian Network for the Detection of Atmospheric Change) ... Article in Journal/Newspaper Arctic DIGIBUG: Repositorio Institucional de la Universidad de Granada Arctic |
institution |
Open Polar |
collection |
DIGIBUG: Repositorio Institucional de la Universidad de Granada |
op_collection_id |
ftunivgranada |
language |
English |
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 (epsilon(c)) 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 (epsilon(f)). 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-epsilon(c) and epsilon(c)) with increasing cutoff radius. SMF vs. FMF slopes and intercepts derived from AERinv and SDA retrievals confirmed the general domination of epsilon(c) over epsilon f 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. GSFC/NASA AERONET project CANDAC (the Canadian Network for the Detection of Atmospheric Change) ... |
format |
Article in Journal/Newspaper |
author |
O'Neill, Norman T. Pérez Ramírez, Daniel |
spellingShingle |
O'Neill, Norman T. Pérez Ramírez, Daniel Relationship between the sub-micron fraction (SMF) and fine-mode fraction (FMF) in the context of AERONET retrievals |
author_facet |
O'Neill, Norman T. Pérez Ramírez, Daniel |
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 |
publishDate |
2023 |
url |
https://hdl.handle.net/10481/80799 https://doi.org/10.5194/amt-16-1103-2023 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
O'Neill, N. T. [et al.]. Relationship between the sub-micron fraction (SMF) and fine-mode fraction (FMF) in the context of AERONET retrievals, Atmos. Meas. Tech., 16, 1103–1120, [https://doi.org/10.5194/amt-16-1103-2023], 2023. https://hdl.handle.net/10481/80799 doi:10.5194/amt-16-1103-2023 |
op_rights |
Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/amt-16-1103-202310.5194/amt-16-1103-2023] |
_version_ |
1768383904948944896 |