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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2020-64
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-64
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  11 Mar 2020

11 Mar 2020

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A revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Retrieval of aerosol properties from Airborne Hyper Angular Rainbow Polarimeter (AirHARP) observations during ACEPOL 2017

Anin Puthukkudy1,2,3, J. Vanderlei Martins1,2,3, Lorraine A. Remer2,3, Xiaoguang Xu2,3, Oleg Dubovik4, Pavel Litvinov5, Brent McBride1,2,3, Sharon Burton6, and Henrique M. J. Barbosa7 Anin Puthukkudy et al.
  • 1Physics Department, University of Maryland Baltimore County, Baltimore, 21250, USA
  • 2Joint Center for Earth Systems Technology, University of Maryland Baltimore County, 5523 Research Park DR, Baltimore, MD 21228, USA
  • 3Earth and Space Institute, University of Maryland Baltimore County, MD, USA
  • 4Laboratoire d’Optique Atmosphérique, CNRS/Université Lille, Villeneuve d’Ascq, France
  • 5GRASP-SAS, Villeneuve d’Ascq, France
  • 6NASA Langley Research Center, Hampton, VA, 23681, USA
  • 7Instituto de Física, Universidade de São Paulo, São Paulo, Brazil

Abstract. Multi-angle polarimetric (MAP) imaging of Earth scenes can be used for the retrieval of microphysical and optical parameters of aerosols and clouds. The Airborne Hyper-Angular Rainbow Polarimeter (AirHARP) is an aircraft MAP instrument with the hyper-angular imaging capability of 60 along-track viewing angles at 670 nm, and 20 along-track viewing angles at other wavelengths 440, 550, 870 nm across the full 114° (94°) along-track (cross-track) field-of-view. Here we report the retrieval of aerosol properties using the Generalized Retrieval of Aerosols and Surface Properties (GRASP) algorithm applied to AirHARP observations collected during the NASA Aerosol Characterization from Polarimeter and Lidar (ACEPOL) campaign in October–November 2017. The retrieved aerosol properties include spherical fraction (SF), aerosol volume concentration in multiple size distribution modes, and with sufficient aerosol loading, complex aerosol refractive index. From these primary retrievals, we derive aerosol optical depth (AOD), Angstrom exponent (AE), and single scattering albedo (SSA). AOD retrieved from AirHARP measurements are compared with the High Spectral Resolution LiDAR-2 (HSRL2) AOD measurements at 532 nm and validated with measurements from collocated Aerosol Robotic NETwork (AERONET) stations. A good correlation with HSRL2 (𝜌 = 0.940, |𝐵𝐼𝐴𝑆| = 0.062) and AERONET AOD (0.013 ≤ Mean Absolute Error (𝑀𝐴𝐸) ≤ 0.017, 0.013 ≤ |𝐵𝐼𝐴𝑆| ≤ 0.017) measurements is observed for the collocated points. Forest fire smoke intercepted during ACEPOL provided a situation with sufficient aerosol loading to retrieve the real part of the refractive index (RRI) of 1.55 and the imaginary part of the refractive index (IRI) of 0.024 The derived SSAs for this case are 0.87, 0.86, 0.84, 0.81 at wavelengths of 440 nm, 550 nm, 670 nm, and 870 nm, respectively. Finer particles with an average AE of 1.53, volume median radius of 0.157 µm and standard deviation of 0.55 µm for fine mode is observed for the same smoke plume. These results serve as a proxy for the scale and detail of aerosol retrievals that are anticipated from future space mission data, as :HARP CubeSat (mission begins 2020) and HARP2 (aboard the NASA PACE mission with launch in 2023) are near duplicates of AirHARP and are expected to provide the same level of aerosol characterization.

Anin Puthukkudy et al.

Anin Puthukkudy et al.

Anin Puthukkudy et al.

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Latest update: 05 Aug 2020
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Short summary
In this work, we report the demonstration and validation of the aerosol properties retrieved using AirHARP and GRASP for the data from NASA ACEPOL campaign 2017. These results serve as a proxy for the scale and detail of aerosol retrievals that are anticipated from future space mission data, as: HARP CubeSat (mission begins 2020) and HARP2 (aboard the NASA PACE mission with the launch in 2023) are near duplicates of AirHARP and are expected to provide the same level of aerosol characterization.
In this work, we report the demonstration and validation of the aerosol properties retrieved...
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