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Aerosol Properties Computed from Aircraft-Based Observations During the ACE-Asia Campaign: 2. A Case Study of Lidar Ratio Closure.

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Title: Aerosol Properties Computed from Aircraft-Based Observations During the ACE-Asia Campaign: 2. A Case Study of Lidar Ratio Closure.
Authors: Kuzmanoski, M.1, Box, M. A.2, Schmid, B.3, Box, G. P.2, Wang, J.4, Russell, P. B.5, Bates, D.6, Jonsson, H. H.7, Welton, E. J.8, Seinfeld, J. H.9
Source: Aerosol Science & Technology. Mar2007, Vol. 41 Issue 3, p231-243. 13p. 3 Charts, 4 Graphs.
Subjects: Optical radar, Laser communication systems, Radar -- Optical equipment, Particles, Aerosols, Atomization, Atomizers, Air pollution, Dust, Particle size distribution
Abstract: For a vertical profile with three distinct layers (marine boundary, pollution, and dust layers), observed during the ACE-Asia campaign, we carried out a comparison between the modeled lidar ratio vertical profile and that obtained from co-located airborne NASA AATS-14 sunphotometer and shipborne Micro-Pulse Lidar (MPL) measurements. The vertically resolved lidar ratio was calculated from two size distribution vertical profiles—one obtained by inversion of sunphotometer-derived extinction spectra, and one measured in-situ—combined with the same refractive index model based on aerosol chemical composition. The aerosol model implies single scattering albedos of 0.78–0.81 and 0.93–0.96 at 0.523 μm (the wavelength of the lidar measurements), in the pollution and dust layers, respectively. The lidar ratios calculated from the two size distribution profiles agree closely in the dust layer; they are however, significantly lower than the lidar ratios derived from combined lidar and sunphotometer measurements. Uncertainties in aerosol size distributions and refractive index only partly explain these differences, suggesting that particle nonsphericity in this layer is an additional explanation. In the pollution layer, the two size distribution profiles yield lidar ratios that agree within the estimated uncertainties. The retrieved size distributions result in a lidar ratio which is in closer agreement with that derived from lidar/sunphotometer measurements in this layer, with still large differences at certain altitudes (the largest relative difference was 46%). We explain these differences by non-uniqueness of the result of the size distribution retrieval, by a lack of information on the mixing state of particles, and the vertical variability of the particle refractive index. [ABSTRACT FROM AUTHOR]
Copyright of Aerosol Science & Technology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Aerosol Properties Computed from Aircraft-Based Observations During the ACE-Asia Campaign: 2. A Case Study of Lidar Ratio Closure.
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  Data: <searchLink fieldCode="AR" term="%22Kuzmanoski%2C+M%2E%22">Kuzmanoski, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Box%2C+M%2E+A%2E%22">Box, M. A.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Schmid%2C+B%2E%22">Schmid, B.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Box%2C+G%2E+P%2E%22">Box, G. P.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+J%2E%22">Wang, J.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Russell%2C+P%2E+B%2E%22">Russell, P. B.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Bates%2C+D%2E%22">Bates, D.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Jonsson%2C+H%2E+H%2E%22">Jonsson, H. H.</searchLink><relatesTo>7</relatesTo><br /><searchLink fieldCode="AR" term="%22Welton%2C+E%2E+J%2E%22">Welton, E. J.</searchLink><relatesTo>8</relatesTo><br /><searchLink fieldCode="AR" term="%22Seinfeld%2C+J%2E+H%2E%22">Seinfeld, J. H.</searchLink><relatesTo>9</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Aerosol+Science+%26+Technology%22">Aerosol Science & Technology</searchLink>. Mar2007, Vol. 41 Issue 3, p231-243. 13p. 3 Charts, 4 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Optical+radar%22">Optical radar</searchLink><br /><searchLink fieldCode="DE" term="%22Laser+communication+systems%22">Laser communication systems</searchLink><br /><searchLink fieldCode="DE" term="%22Radar+--+Optical+equipment%22">Radar -- Optical equipment</searchLink><br /><searchLink fieldCode="DE" term="%22Particles%22">Particles</searchLink><br /><searchLink fieldCode="DE" term="%22Aerosols%22">Aerosols</searchLink><br /><searchLink fieldCode="DE" term="%22Atomization%22">Atomization</searchLink><br /><searchLink fieldCode="DE" term="%22Atomizers%22">Atomizers</searchLink><br /><searchLink fieldCode="DE" term="%22Air+pollution%22">Air pollution</searchLink><br /><searchLink fieldCode="DE" term="%22Dust%22">Dust</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+size+distribution%22">Particle size distribution</searchLink>
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  Label: Abstract
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  Data: For a vertical profile with three distinct layers (marine boundary, pollution, and dust layers), observed during the ACE-Asia campaign, we carried out a comparison between the modeled lidar ratio vertical profile and that obtained from co-located airborne NASA AATS-14 sunphotometer and shipborne Micro-Pulse Lidar (MPL) measurements. The vertically resolved lidar ratio was calculated from two size distribution vertical profiles—one obtained by inversion of sunphotometer-derived extinction spectra, and one measured in-situ—combined with the same refractive index model based on aerosol chemical composition. The aerosol model implies single scattering albedos of 0.78–0.81 and 0.93–0.96 at 0.523 μm (the wavelength of the lidar measurements), in the pollution and dust layers, respectively. The lidar ratios calculated from the two size distribution profiles agree closely in the dust layer; they are however, significantly lower than the lidar ratios derived from combined lidar and sunphotometer measurements. Uncertainties in aerosol size distributions and refractive index only partly explain these differences, suggesting that particle nonsphericity in this layer is an additional explanation. In the pollution layer, the two size distribution profiles yield lidar ratios that agree within the estimated uncertainties. The retrieved size distributions result in a lidar ratio which is in closer agreement with that derived from lidar/sunphotometer measurements in this layer, with still large differences at certain altitudes (the largest relative difference was 46%). We explain these differences by non-uniqueness of the result of the size distribution retrieval, by a lack of information on the mixing state of particles, and the vertical variability of the particle refractive index. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Aerosol Science & Technology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1080/02786820601146977
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        Text: English
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        PageCount: 13
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    Subjects:
      – SubjectFull: Optical radar
        Type: general
      – SubjectFull: Laser communication systems
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      – SubjectFull: Radar -- Optical equipment
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      – SubjectFull: Particles
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              Text: Mar2007
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