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Atmosphere 2018, 9(6), 228; https://doi.org/10.3390/atmos9060228

A Closure Study of Total Scattering Using Airborne In Situ Measurements from the Winter Phase of TCAP

1
Pacific Northwest National Laboratory, Richland, WA 99352, USA
2
Department of Physics, University of Nevada, Reno, NV 89557, USA
3
Brookhaven National Laboratory, Upton, NY 11973, USA
4
Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309; USA
*
Author to whom correspondence should be addressed.
Received: 8 May 2018 / Revised: 7 June 2018 / Accepted: 8 June 2018 / Published: 12 June 2018
(This article belongs to the Section Aerosols)
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Abstract

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. View Full-Text
Keywords: 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) 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)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kassianov, E.; Berg, L.K.; Pekour, M.; Barnard, J.; Chand, D.; Comstock, J.; Flynn, C.; Sedlacek, A.; Shilling, J.; Telg, H.; Tomlinson, J.; Zelenyuk, A.; Fast, J. A Closure Study of Total Scattering Using Airborne In Situ Measurements from the Winter Phase of TCAP. Atmosphere 2018, 9, 228.

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