DOI: 10.5281/zenodo.8144789
title: Mineral spectral refractive index and bulk optical property dataset for aerosol studies

description: This database include supplemental data and files for the publication of this paper:

Sensitivities of Spectral Optical Properties of Dust Aerosols to their Mineralogical and Microphysical Properties. Yuheng Zhang, M. Saito, P. Yang, G. L. Schuster, and C. R. Trepte, J. Geophys. Res. Atmos. 2024.

The supplemental data include:

1) 'GroupRefInd.tar.gz' Mineral (group) refractive index files.E. g., 1All_Illite.dat contains the complex refractive index files of illite group. Format (from left to right columns): Wavelength (unit: µm), Real part (n), Imaginary part (k), standard deviation of n, standard deviation of k.The file 'fine_log.dat' includes the mean and standard deviation values of n and k for all the generated fine mode dust samples at 11,044 wavelengths from 0.2 to 50 micron. The file 'fine_log127.dat' only includes the values at 127 wavelengths from 0.2 to 50 micron (defined in 'swav.txt' and 'lwav.txt'), and is used for the bulk property computations. The files 'coarse_log.dat' and 'coarse_log127.dat' are for the coarse mode dust samples.

2) 'CompositionFraction.xlsx': Mineral composition data sources/references and composition data (mean and standard deviation values of each group).'Vlog_coarse.dat': Randomly generated VOLUME FRACTION of nine mineral groups for the coarse mode dust. Left to right: Illite, Kaolinite, Montmorillonite (Other clays), Quartz, Feldspar, Carbonate, Gypsum (Sulphate), Hematite, Goethite.'Vlog_fine.dat': For the fine mode dust.

3) 'RefSources.xlsx': The data source references of mineral refractive indices. We didn't include the olivine, other silicates, soot and titanium-rich minerals in the paper, but the refractive indices are available for those who are interested.

4) 'DustSamples.tar.gz' Dust sample refractive index files.The files are enclosed in four folders: fine_sw/ fine_lw/ coarse_sw/ coarse_lw/. fine: fine mode. coarse: coarse mode. 'sw' means shortwave (< 4 µm, in total 76 wavelengths defined in 'swav.txt') while 'lw' means longwave (>= 4 µm, in total 51 wavelengths defined in 'lwav.txt'). All files start with 'rdn', which means that they are computed based on randomly generated composition (data given in sheet 2 of 'CompositionFraction.xlsx'). The four digit number after 'rdn' is the index of each dust sample. In total, there are 5,000 samples. The sample composition is the same for the same sample index in the same size mode (fine/coarse). Data file format (from left to right columns): real part, imaginary part.

5) 'BulkProperties.tar.gz' Bulk property files.'qoutx' files format (from left to right columns): Extinction efficiency (Qext), Scattering efficiency (Qsca), Backscattering efficiency (Qbck), and Asymmetry coefficient (Qasy). To obtain asymmetry factor, use Qasy/Qsca.'bkoutx' files format (from left to right columns): P11(pi) P12(pi) P22(pi) P33(pi) P34(pi) P44(pi).'phmswx' files contain phase matrix results at 532 nm. From left to right: P11, P12, P22, P33, P34, P44.'phmlwx' files contain phase matrix results at 10.5 µm.

'x' refers to the number at the end of the file name. It can be 1 ~ 10, each represents a setting ofcoarse and fine mode effective radius and volume fraction:1: 2.0(Coarse, 97%), 0.2(Fine, 3%)2: 2.0(95%), 0.2(5%)3: 2.0(90%), 0.2(10%)4: 2.0(80%), 0.2(20%)5: 2.0(95%), 0.05(5%)6: 2.0(95%), 0.1(5%)7: 2.0(95%), 0.3(5%)8: 1.5(95%), 0.2(5%)9: 3.0(95%), 0.2(5%)10: 4.0(95%), 0.2(5%)

There are 635,000 rows in each data file. 635,000 rows = 127 wavelengths * 5,000 samples. Row 1~127 is sample 1, row 128~254 is sample 2, etc.. Suggest to use matlab function 'reshape(property, 127, 5000)' for each column when processing the data.

For more detailed information and datasets, please contact: Yuheng Zhang, yuheng98@tamu.edu or ustczyh9@gmail.com.