A Closure Study of Total Scattering Using Airborne In Situ Measurements from the Winter Phase of TCAP
We examine the performance of our approach for calculating the total scattering coefficient of both non-absorbing and absorbing aerosol at ambient conditions from aircraft data. Our extended examination involves airborne in situ data collected by the U.S. Department of Energy’s (DOE) Gulf Stream 1 a...
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Online Access: | https://doi.org/10.3390/atmos9060228 https://doaj.org/article/10ec69022714435d9b10e73023e1f4e8 |
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ftdoajarticles:oai:doaj.org/article:10ec69022714435d9b10e73023e1f4e8 2023-05-15T17:34:45+02:00 A Closure Study of Total Scattering Using Airborne In Situ Measurements from the Winter Phase of TCAP Evgueni Kassianov Larry K. Berg Mikhail Pekour James Barnard Duli Chand Jennifer Comstock Connor Flynn Arthur Sedlacek John Shilling Hagen Telg Jason Tomlinson Alla Zelenyuk Jerome Fast 2018-06-01T00:00:00Z https://doi.org/10.3390/atmos9060228 https://doaj.org/article/10ec69022714435d9b10e73023e1f4e8 EN eng MDPI AG http://www.mdpi.com/2073-4433/9/6/228 https://doaj.org/toc/2073-4433 2073-4433 doi:10.3390/atmos9060228 https://doaj.org/article/10ec69022714435d9b10e73023e1f4e8 Atmosphere, Vol 9, Iss 6, p 228 (2018) aircraft measurements of aerosol microphysical chemical and optical components and ambient relative humidity ultra-high sensitivity aerosol spectrometer (UHSAS) passive cavity aerosol spectrometer (PCASP) cloud and aerosol spectrometer (CAS) aerosol mass spectrometer (AMS) single particle soot photometer (SP2) single particle mass spectrometer (miniSPLAT) integrating nephelometer humidification system winter phase of Two-Column Aerosol Project (TCAP) Meteorology. Climatology QC851-999 article 2018 ftdoajarticles https://doi.org/10.3390/atmos9060228 2022-12-31T12:01:20Z We examine the performance of our approach for calculating the total scattering coefficient of both non-absorbing and absorbing aerosol at ambient conditions from aircraft data. Our extended examination involves airborne in situ data collected by the U.S. Department of Energy’s (DOE) Gulf Stream 1 aircraft during winter over Cape Cod and the western North Atlantic Ocean as part of the Two-Column Aerosol Project (TCAP). The particle population represented by the winter dataset, in contrast with its summer counterpart, contains more hygroscopic particles and particles with an enhanced ability to absorb sunlight due to the larger fraction of black carbon. Moreover, the winter observations are characterized by more frequent clouds and a larger fraction of super-micron particles. We calculate model total scattering coefficient at ambient conditions using size spectra measured by optical particle counters (OPCs) and ambient complex refractive index (RI) estimated from measured chemical composition and relative humidity (RH). We demonstrate that reasonable agreement (~20% on average) between the observed and calculated scattering can be obtained under subsaturated ambient conditions (RH < 80%) by applying both screening for clouds and chemical composition data for the RI-based correction of the OPC-derived size spectra. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Atmosphere 9 6 228 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
aircraft measurements of aerosol microphysical chemical and optical components and ambient relative humidity ultra-high sensitivity aerosol spectrometer (UHSAS) passive cavity aerosol spectrometer (PCASP) cloud and aerosol spectrometer (CAS) aerosol mass spectrometer (AMS) single particle soot photometer (SP2) single particle mass spectrometer (miniSPLAT) integrating nephelometer humidification system winter phase of Two-Column Aerosol Project (TCAP) Meteorology. Climatology QC851-999 |
spellingShingle |
aircraft measurements of aerosol microphysical chemical and optical components and ambient relative humidity ultra-high sensitivity aerosol spectrometer (UHSAS) passive cavity aerosol spectrometer (PCASP) cloud and aerosol spectrometer (CAS) aerosol mass spectrometer (AMS) single particle soot photometer (SP2) single particle mass spectrometer (miniSPLAT) integrating nephelometer humidification system winter phase of Two-Column Aerosol Project (TCAP) Meteorology. Climatology QC851-999 Evgueni Kassianov Larry K. Berg Mikhail Pekour James Barnard Duli Chand Jennifer Comstock Connor Flynn Arthur Sedlacek John Shilling Hagen Telg Jason Tomlinson Alla Zelenyuk Jerome Fast A Closure Study of Total Scattering Using Airborne In Situ Measurements from the Winter Phase of TCAP |
topic_facet |
aircraft measurements of aerosol microphysical chemical and optical components and ambient relative humidity ultra-high sensitivity aerosol spectrometer (UHSAS) passive cavity aerosol spectrometer (PCASP) cloud and aerosol spectrometer (CAS) aerosol mass spectrometer (AMS) single particle soot photometer (SP2) single particle mass spectrometer (miniSPLAT) integrating nephelometer humidification system winter phase of Two-Column Aerosol Project (TCAP) Meteorology. Climatology QC851-999 |
description |
We examine the performance of our approach for calculating the total scattering coefficient of both non-absorbing and absorbing aerosol at ambient conditions from aircraft data. Our extended examination involves airborne in situ data collected by the U.S. Department of Energy’s (DOE) Gulf Stream 1 aircraft during winter over Cape Cod and the western North Atlantic Ocean as part of the Two-Column Aerosol Project (TCAP). The particle population represented by the winter dataset, in contrast with its summer counterpart, contains more hygroscopic particles and particles with an enhanced ability to absorb sunlight due to the larger fraction of black carbon. Moreover, the winter observations are characterized by more frequent clouds and a larger fraction of super-micron particles. We calculate model total scattering coefficient at ambient conditions using size spectra measured by optical particle counters (OPCs) and ambient complex refractive index (RI) estimated from measured chemical composition and relative humidity (RH). We demonstrate that reasonable agreement (~20% on average) between the observed and calculated scattering can be obtained under subsaturated ambient conditions (RH < 80%) by applying both screening for clouds and chemical composition data for the RI-based correction of the OPC-derived size spectra. |
format |
Article in Journal/Newspaper |
author |
Evgueni Kassianov Larry K. Berg Mikhail Pekour James Barnard Duli Chand Jennifer Comstock Connor Flynn Arthur Sedlacek John Shilling Hagen Telg Jason Tomlinson Alla Zelenyuk Jerome Fast |
author_facet |
Evgueni Kassianov Larry K. Berg Mikhail Pekour James Barnard Duli Chand Jennifer Comstock Connor Flynn Arthur Sedlacek John Shilling Hagen Telg Jason Tomlinson Alla Zelenyuk Jerome Fast |
author_sort |
Evgueni Kassianov |
title |
A Closure Study of Total Scattering Using Airborne In Situ Measurements from the Winter Phase of TCAP |
title_short |
A Closure Study of Total Scattering Using Airborne In Situ Measurements from the Winter Phase of TCAP |
title_full |
A Closure Study of Total Scattering Using Airborne In Situ Measurements from the Winter Phase of TCAP |
title_fullStr |
A Closure Study of Total Scattering Using Airborne In Situ Measurements from the Winter Phase of TCAP |
title_full_unstemmed |
A Closure Study of Total Scattering Using Airborne In Situ Measurements from the Winter Phase of TCAP |
title_sort |
closure study of total scattering using airborne in situ measurements from the winter phase of tcap |
publisher |
MDPI AG |
publishDate |
2018 |
url |
https://doi.org/10.3390/atmos9060228 https://doaj.org/article/10ec69022714435d9b10e73023e1f4e8 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmosphere, Vol 9, Iss 6, p 228 (2018) |
op_relation |
http://www.mdpi.com/2073-4433/9/6/228 https://doaj.org/toc/2073-4433 2073-4433 doi:10.3390/atmos9060228 https://doaj.org/article/10ec69022714435d9b10e73023e1f4e8 |
op_doi |
https://doi.org/10.3390/atmos9060228 |
container_title |
Atmosphere |
container_volume |
9 |
container_issue |
6 |
container_start_page |
228 |
_version_ |
1766133680093265920 |