In situ measurements of angular-dependent light scattering by aerosols over the contiguous United States
This work provides a synopsis of aerosol phase function (<i>F</i><sub>11</sub>) and polarized phase function (<i>F</i><sub>12</sub>) measurements made by the Polarized Imaging Nephelometer (PI-Neph) during the Studies of Emissions, Atmospheric Compo...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-03-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/18/3737/2018/acp-18-3737-2018.pdf |
| _version_ | 1828772517260558336 |
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| author | W. R. Espinosa W. R. Espinosa J. V. Martins J. V. Martins L. A. Remer L. A. Remer A. Puthukkudy A. Puthukkudy D. Orozco D. Orozco G. Dolgos G. Dolgos G. Dolgos |
| author_facet | W. R. Espinosa W. R. Espinosa J. V. Martins J. V. Martins L. A. Remer L. A. Remer A. Puthukkudy A. Puthukkudy D. Orozco D. Orozco G. Dolgos G. Dolgos G. Dolgos |
| author_sort | W. R. Espinosa |
| collection | DOAJ |
| description | This work provides a synopsis of aerosol phase function (<i>F</i><sub>11</sub>) and
polarized phase function (<i>F</i><sub>12</sub>) measurements made by the Polarized
Imaging Nephelometer (PI-Neph) during the Studies of Emissions,
Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys
(SEAC<sup>4</sup>RS) and the Deep Convection Clouds and Chemistry (DC3) field
campaigns. In order to more easily explore this extensive dataset, an aerosol
classification scheme is developed that identifies the different aerosol
types measured during the deployments. This scheme makes use of ancillary
data that include trace gases, chemical composition, aerodynamic particle
size and geographic location, all independent of PI-Neph measurements. The
PI-Neph measurements are then grouped according to their ancillary data
classifications and the resulting scattering patterns are examined in detail.
These results represent the first published airborne measurements of <i>F</i><sub>11</sub>
and −<i>F</i><sub>12</sub>∕<i>F</i><sub>11</sub> for many common aerosol types. We then explore whether
PI-Neph light-scattering measurements alone are sufficient to reconstruct the
results of this ancillary data classification algorithm. Principal component
analysis (PCA) is used to reduce the dimensionality of the multi-angle
PI-Neph scattering data and the individual measurements are examined as a
function of ancillary data classification. Clear clustering is observed in
the PCA score space, corresponding to the ancillary classification results,
suggesting that, indeed, a strong link exists between the angular-scattering
measurements and the aerosol type or composition. Two techniques are used to
quantify the degree of clustering and it is found that in most cases the
results of the ancillary data classification can be predicted from PI-Neph
measurements alone with better than 85 % recall. This result both
emphasizes the validity of the ancillary data classification as well as the
PI-Neph's ability to distinguish common aerosol types without additional
information. |
| first_indexed | 2024-12-11T14:45:22Z |
| format | Article |
| id | doaj.art-55a6e66509174d9d93a70fd98c12616c |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-11T14:45:22Z |
| publishDate | 2018-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-55a6e66509174d9d93a70fd98c12616c2022-12-22T01:01:42ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242018-03-01183737375410.5194/acp-18-3737-2018In situ measurements of angular-dependent light scattering by aerosols over the contiguous United StatesW. R. Espinosa0W. R. Espinosa1J. V. Martins2J. V. Martins3L. A. Remer4L. A. Remer5A. Puthukkudy6A. Puthukkudy7D. Orozco8D. Orozco9G. Dolgos10G. Dolgos11G. Dolgos12Department of Physics, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USAJoint Center for Earth Systems Technology, University of Maryland Baltimore County, 5523 Research Park DR, Baltimore, MD 21228, USADepartment of Physics, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USAJoint Center for Earth Systems Technology, University of Maryland Baltimore County, 5523 Research Park DR, Baltimore, MD 21228, USADepartment of Physics, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USAJoint Center for Earth Systems Technology, University of Maryland Baltimore County, 5523 Research Park DR, Baltimore, MD 21228, USADepartment of Physics, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USAJoint Center for Earth Systems Technology, University of Maryland Baltimore County, 5523 Research Park DR, Baltimore, MD 21228, USADepartment of Physics, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USAJoint Center for Earth Systems Technology, University of Maryland Baltimore County, 5523 Research Park DR, Baltimore, MD 21228, USADepartment of Physics, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USAJoint Center for Earth Systems Technology, University of Maryland Baltimore County, 5523 Research Park DR, Baltimore, MD 21228, USAMicos Engineering GmbH, Überlandstrasse 129, 8600, Dübendorf, SwitzerlandThis work provides a synopsis of aerosol phase function (<i>F</i><sub>11</sub>) and polarized phase function (<i>F</i><sub>12</sub>) measurements made by the Polarized Imaging Nephelometer (PI-Neph) during the Studies of Emissions, Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys (SEAC<sup>4</sup>RS) and the Deep Convection Clouds and Chemistry (DC3) field campaigns. In order to more easily explore this extensive dataset, an aerosol classification scheme is developed that identifies the different aerosol types measured during the deployments. This scheme makes use of ancillary data that include trace gases, chemical composition, aerodynamic particle size and geographic location, all independent of PI-Neph measurements. The PI-Neph measurements are then grouped according to their ancillary data classifications and the resulting scattering patterns are examined in detail. These results represent the first published airborne measurements of <i>F</i><sub>11</sub> and −<i>F</i><sub>12</sub>∕<i>F</i><sub>11</sub> for many common aerosol types. We then explore whether PI-Neph light-scattering measurements alone are sufficient to reconstruct the results of this ancillary data classification algorithm. Principal component analysis (PCA) is used to reduce the dimensionality of the multi-angle PI-Neph scattering data and the individual measurements are examined as a function of ancillary data classification. Clear clustering is observed in the PCA score space, corresponding to the ancillary classification results, suggesting that, indeed, a strong link exists between the angular-scattering measurements and the aerosol type or composition. Two techniques are used to quantify the degree of clustering and it is found that in most cases the results of the ancillary data classification can be predicted from PI-Neph measurements alone with better than 85 % recall. This result both emphasizes the validity of the ancillary data classification as well as the PI-Neph's ability to distinguish common aerosol types without additional information.https://www.atmos-chem-phys.net/18/3737/2018/acp-18-3737-2018.pdf |
| spellingShingle | W. R. Espinosa W. R. Espinosa J. V. Martins J. V. Martins L. A. Remer L. A. Remer A. Puthukkudy A. Puthukkudy D. Orozco D. Orozco G. Dolgos G. Dolgos G. Dolgos In situ measurements of angular-dependent light scattering by aerosols over the contiguous United States Atmospheric Chemistry and Physics |
| title | In situ measurements of angular-dependent light scattering by aerosols over the contiguous United States |
| title_full | In situ measurements of angular-dependent light scattering by aerosols over the contiguous United States |
| title_fullStr | In situ measurements of angular-dependent light scattering by aerosols over the contiguous United States |
| title_full_unstemmed | In situ measurements of angular-dependent light scattering by aerosols over the contiguous United States |
| title_short | In situ measurements of angular-dependent light scattering by aerosols over the contiguous United States |
| title_sort | in situ measurements of angular dependent light scattering by aerosols over the contiguous united states |
| url | https://www.atmos-chem-phys.net/18/3737/2018/acp-18-3737-2018.pdf |
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