Estimation of Aerosol Columnar Size Distribution from Spectral Extinction Data in Coastal and Maritime Environment

Aerosol columnar size distributions (SDs) are commonly provided by aerosol inversions based on measurements of both spectral extinction and sky radiance. These inversions developed for a fully clear sky offer few SDs for areas with abundant clouds. Here, we estimate SDs from spectral extinction data...

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Autores principales:	Evgueni Kassianov, Mikhail Pekour, James Barnard, Connor J. Flynn, Fan Mei, Larry K. Berg
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	aerosol size distributions from ground-based and aircraft observations aerosol refractive index from chemical composition data coastal and maritime sites with low aerosol loading and abundance of clouds Meteorology. Climatology QC851-999
Acceso en línea:	https://doaj.org/article/304b90bb66ef48c88c6e37c34a1d02f2
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id	oai:doaj.org-article:304b90bb66ef48c88c6e37c34a1d02f2
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spelling	oai:doaj.org-article:304b90bb66ef48c88c6e37c34a1d02f22021-11-25T16:44:17ZEstimation of Aerosol Columnar Size Distribution from Spectral Extinction Data in Coastal and Maritime Environment10.3390/atmos121114122073-4433https://doaj.org/article/304b90bb66ef48c88c6e37c34a1d02f22021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4433/12/11/1412https://doaj.org/toc/2073-4433Aerosol columnar size distributions (SDs) are commonly provided by aerosol inversions based on measurements of both spectral extinction and sky radiance. These inversions developed for a fully clear sky offer few SDs for areas with abundant clouds. Here, we estimate SDs from spectral extinction data alone for cloudy coastal and maritime regions using aerosol refractive index (RI) obtained from chemical composition data. Our estimation involves finding volume and mean radius of lognormally distributed modes of an assumed bimodal size distribution through fitting of the spectral extinction data. We demonstrate that vertically integrated SDs obtained from aircraft measurements over a coastal site have distinct seasonal changes, and these changes are captured reasonably well by the estimated columnar SDs. We also demonstrate that similar seasonal changes occur at a maritime site, and columnar SDs retrieved from the combined extinction and sky radiance measurements are approximated quite well by their extinction only counterparts (correlation exceeds 0.9) during a 7-year period (2013–2019). The level of agreement between the estimated and retrieved SDs depends weakly on wavelength selection within a given spectral interval (roughly 0.4–1 µm). Since the extinction-based estimations can be performed frequently for partly cloudy skies, the number of periods where SDs can be found is greatly increased.Evgueni KassianovMikhail PekourJames BarnardConnor J. FlynnFan MeiLarry K. BergMDPI AGarticleaerosol size distributions from ground-based and aircraft observationsaerosol refractive index from chemical composition datacoastal and maritime sites with low aerosol loading and abundance of cloudsMeteorology. ClimatologyQC851-999ENAtmosphere, Vol 12, Iss 1412, p 1412 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	aerosol size distributions from ground-based and aircraft observations aerosol refractive index from chemical composition data coastal and maritime sites with low aerosol loading and abundance of clouds Meteorology. Climatology QC851-999
spellingShingle	aerosol size distributions from ground-based and aircraft observations aerosol refractive index from chemical composition data coastal and maritime sites with low aerosol loading and abundance of clouds Meteorology. Climatology QC851-999 Evgueni Kassianov Mikhail Pekour James Barnard Connor J. Flynn Fan Mei Larry K. Berg Estimation of Aerosol Columnar Size Distribution from Spectral Extinction Data in Coastal and Maritime Environment
description	Aerosol columnar size distributions (SDs) are commonly provided by aerosol inversions based on measurements of both spectral extinction and sky radiance. These inversions developed for a fully clear sky offer few SDs for areas with abundant clouds. Here, we estimate SDs from spectral extinction data alone for cloudy coastal and maritime regions using aerosol refractive index (RI) obtained from chemical composition data. Our estimation involves finding volume and mean radius of lognormally distributed modes of an assumed bimodal size distribution through fitting of the spectral extinction data. We demonstrate that vertically integrated SDs obtained from aircraft measurements over a coastal site have distinct seasonal changes, and these changes are captured reasonably well by the estimated columnar SDs. We also demonstrate that similar seasonal changes occur at a maritime site, and columnar SDs retrieved from the combined extinction and sky radiance measurements are approximated quite well by their extinction only counterparts (correlation exceeds 0.9) during a 7-year period (2013–2019). The level of agreement between the estimated and retrieved SDs depends weakly on wavelength selection within a given spectral interval (roughly 0.4–1 µm). Since the extinction-based estimations can be performed frequently for partly cloudy skies, the number of periods where SDs can be found is greatly increased.
format	article
author	Evgueni Kassianov Mikhail Pekour James Barnard Connor J. Flynn Fan Mei Larry K. Berg
author_facet	Evgueni Kassianov Mikhail Pekour James Barnard Connor J. Flynn Fan Mei Larry K. Berg
author_sort	Evgueni Kassianov
title	Estimation of Aerosol Columnar Size Distribution from Spectral Extinction Data in Coastal and Maritime Environment
title_short	Estimation of Aerosol Columnar Size Distribution from Spectral Extinction Data in Coastal and Maritime Environment
title_full	Estimation of Aerosol Columnar Size Distribution from Spectral Extinction Data in Coastal and Maritime Environment
title_fullStr	Estimation of Aerosol Columnar Size Distribution from Spectral Extinction Data in Coastal and Maritime Environment
title_full_unstemmed	Estimation of Aerosol Columnar Size Distribution from Spectral Extinction Data in Coastal and Maritime Environment
title_sort	estimation of aerosol columnar size distribution from spectral extinction data in coastal and maritime environment
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/304b90bb66ef48c88c6e37c34a1d02f2
work_keys_str_mv	AT evguenikassianov estimationofaerosolcolumnarsizedistributionfromspectralextinctiondataincoastalandmaritimeenvironment AT mikhailpekour estimationofaerosolcolumnarsizedistributionfromspectralextinctiondataincoastalandmaritimeenvironment AT jamesbarnard estimationofaerosolcolumnarsizedistributionfromspectralextinctiondataincoastalandmaritimeenvironment AT connorjflynn estimationofaerosolcolumnarsizedistributionfromspectralextinctiondataincoastalandmaritimeenvironment AT fanmei estimationofaerosolcolumnarsizedistributionfromspectralextinctiondataincoastalandmaritimeenvironment AT larrykberg estimationofaerosolcolumnarsizedistributionfromspectralextinctiondataincoastalandmaritimeenvironment
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Estimation of Aerosol Columnar Size Distribution from Spectral Extinction Data in Coastal and Maritime Environment

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