Publication Abstracts

Xu et al. 2018

Xu, F., G. Harten, D.J. Diner, A.B. Davis, F.C. Seidel, B. Rheingans, M. Tosca, M.D. Alexandrov, B. Cairns, R.A. Ferrare, S.P. Burton, M.A. Fenn, C.A. Hostetler, R. Wood, and J. Redemann, 2018: Coupled retrieval of liquid water cloud and above-cloud aerosol properties using the Airborne Multiangle SpectroPolarimetric Imager (AirMSPI). J. Geophys. Res. Atmos., 123, no. 6, 3175-3204, doi:10.1002/2017JD027926.

An optimization algorithm is developed to retrieve liquid water cloud properties including cloud optical depth (COD), droplet size distribution and cloud top height (CTH), and above-cloud aerosol properties including aerosol optical depth (AOD), single-scattering albedo, and microphysical properties from sweep-mode observations by Jet Propulsion Laboratory's Airborne Multiangle SpectroPolarimetric Imager (AirMSPI) instrument. The retrieval is composed of three major steps: (1) initial estimate of the mean droplet size distribution across the entire image of 80-100 km along track by 10-25 km across track from polarimetric cloudbow observations, (2) coupled retrieval of image-scale cloud and above-cloud aerosol properties by fitting the polarimetric data at all observation angles, and (3) iterative retrieval of 1-D radiative transfer-based COD and droplet size distribution at pixel scale (25 m) by establishing relationships between COD and droplet size and fitting the total radiance measurements. Our retrieval is tested using 134 AirMSPI data sets acquired during the National Aeronautics and Space Administration (NASA) field campaign ObseRvations of Aerosols above CLouds and their intEractionS. The retrieved above-cloud AOD and CTH are compared to coincident HSRL-2 (HSRL-2, NASA Langley Research Center) data, and COD and droplet size distribution parameters (effective radius reff and effective variance veff) are compared to coincident Research Scanning Polarimeter (RSP) (NASA Goddard Institute for Space Studies) data. Mean absolute differences between AirMSPI and HSRL-2 retrievals of above-cloud AOD at 532 nm and CTH are 0.03 and <0.5 km, respectively. At RSP's footprint scale (∼ 323 m), mean absolute differences between RSP and AirMSPI retrievals of COD, reff, and veff in the cloudbow area are 2.33, 0.69 µm, and 0.020, respectively. Neglect of smoke aerosols above cloud leads to an underestimate of image-averaged COD by ∼15%.

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BibTeX Citation

@article{xu07000h,
  author={Xu, F. and Harten, G. and Diner, D. J. and Davis, A. B. and Seidel, F. C. and Rheingans, B. and Tosca, M. and Alexandrov, M. D. and Cairns, B. and Ferrare, R. A. and Burton, S. P. and Fenn, M. A. and Hostetler, C. A. and Wood, R. and Redemann, J.},
  title={Coupled retrieval of liquid water cloud and above-cloud aerosol properties using the Airborne Multiangle SpectroPolarimetric Imager (AirMSPI)},
  year={2018},
  journal={J. Geophys. Res. Atmos.},
  volume={123},
  number={6},
  pages={3175--3204},
  doi={10.1002/2017JD027926},
}

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RIS Citation

TY  - JOUR
ID  - xu07000h
AU  - Xu, F.
AU  - Harten, G.
AU  - Diner, D. J.
AU  - Davis, A. B.
AU  - Seidel, F. C.
AU  - Rheingans, B.
AU  - Tosca, M.
AU  - Alexandrov, M. D.
AU  - Cairns, B.
AU  - Ferrare, R. A.
AU  - Burton, S. P.
AU  - Fenn, M. A.
AU  - Hostetler, C. A.
AU  - Wood, R.
AU  - Redemann, J.
PY  - 2018
TI  - Coupled retrieval of liquid water cloud and above-cloud aerosol properties using the Airborne Multiangle SpectroPolarimetric Imager (AirMSPI)
JA  - J. Geophys. Res. Atmos.
VL  - 123
IS  - 6
SP  - 3175
EP  - 3204
DO  - 10.1002/2017JD027926
ER  -

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