Aerosol Microphysical Properties from the AERONET database



This web page is in support of the article:


Roger, J.-C., Vermote, E., Skakun, S., Murphy, E., Dubovik, O., Kalecinski, N., Korgo, B., and Holben, B., 2022. "Aerosol models from the AERONET database: application to surface reflectance validation". Atmos. Meas. Tech., Vol. 15, 1123–1144


Click HERE to download the file that contains the necessary coefficients to compute all aerosol microphysical properties for the AERONET sites given below.


There are 3 aerosols microphysical properties:

  • (1) the size distribution,
  • (2) the complex refractive index, and
  • (3) the % of sphericity.

  • (1) In our formulation, the aerosol size-distribution is described as:



    where:

  • Cvf (the particle volume concentration of the fine mode),
  • Cvc (the particle volume concentration of the coarse mode),
  • rvf et rvc (the particle median volume radius of the fine and coarse mode),
  • σf and σc (the standard deviation of the Gaussian’s law of the fine and coarse mode).

  • (2) The complex refractive index, n = nr + i ni, is given by the real part nr and the imaginary part ni. It’s available from AERONET for 4 wavelengths: 440, 650, 870, 1020.


    (3) The % of sphericity is %Sph.



    Click HERE to download the file that contains the necessary coefficients to compute all aerosol microphysical properties AMP for the AERONET sites given below. Each AMP can be determined as:



    where :

  • AMP can be %Cvf, %Cvc, Cvf, Cvc, rvf, rvc, σr, σc, nr440, nr650, nr850, nr1020, ni440, ni650, ni850, ni1020, %Sph,
  • τ440 is the aerosol optical thickness at 440 nm,
  • α440-870 is the Angtröm coefficients between 440 nm and 870 nm.


  • If you want, you can remove the systematic bias A (provided in the file to download above). In that case, AMP is determined as:




    Finally, you may apply thresholds to avoid outliers. In the file (to download above), we also provide:

  • Percentiles 0.99 and 0.01 (as maximum and minimum values), or
  • Percentiles 0.95 and 0.05 (as maximum and minimum values)


  • List of AERONET sites with all coefficients (including refractive index)


    List of AERONET sites without refractive index



    For any additional questions, contact Jean-Claude Roger at roger63@umd.edu