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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ftmdpi:oai:mdpi.com:/2073-4433/9/6/228/ 2023-08-20T04:08:28+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 agris 2018-06-12 application/pdf https://doi.org/10.3390/atmos9060228 EN eng Multidisciplinary Digital Publishing Institute Aerosols https://dx.doi.org/10.3390/atmos9060228 https://creativecommons.org/licenses/by/4.0/ Atmosphere; Volume 9; Issue 6; Pages: 228 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) Text 2018 ftmdpi https://doi.org/10.3390/atmos9060228 2023-07-31T21:34:21Z 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. Text North Atlantic MDPI Open Access Publishing Atmosphere 9 6 228 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
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) |
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) 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) |
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 |
Text |
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 |
Multidisciplinary Digital Publishing Institute |
publishDate |
2018 |
url |
https://doi.org/10.3390/atmos9060228 |
op_coverage |
agris |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmosphere; Volume 9; Issue 6; Pages: 228 |
op_relation |
Aerosols https://dx.doi.org/10.3390/atmos9060228 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/atmos9060228 |
container_title |
Atmosphere |
container_volume |
9 |
container_issue |
6 |
container_start_page |
228 |
_version_ |
1774720743195541504 |