DOI: 10.5281/zenodo.8144788
title: Mineral spectral refractive index and bulk optical property dataset for aerosol studies

description: Version 1.3, updated 11/15/2024.

Added a file with 27 regional dust sample mineral composition information 'NewRegionalSamples.xlsx',

along with the refractive index data.

All refractive index files here have 127 rows (wavelengths) and 27 columns (samples)

'kall27_coarse.dat' is the imaginary part of the coarse mode. 

'kall27_fine.dat' is the imaginary part of the fine mode.

'nall27_coarse.dat' is the real part of the coarse mode.

'nall27_fine.dat' is the real part of the fine mode.

Version 1.2, updated 04/23/2024.Major changes: Changed all the data file names to new format: "mix"+{property name}+{number}, rearranged the number of mixing samples

Updated all the bulk optical property data. This version use constant values of standard deviation in the lognormal size distribution settings for the coarse mode and the fine mode respectively.

The phase matrices are separated from the other bulk properties due to their large file sizes. The readme file is updated correspondingly. The information of scattering angles (498 angles in total) is uploaded as "TAMUdust2020_Angle.dat".

Added supplemental file data in 'Supplemental.tar.gz'.

Additional refractive indices are zipped in 'AdditionalRefInd.tar.gz'

Version 1.1, updated 03/14/2024.Major changes: Added mixed bulk properties for "0 (99%coarse+1%fine)" and "11 (2.0 µm coarse+ 0.4 µm fine)";Added "reff.dat" in the 'BulkProperties.tar.gz'. The data include four columns: fine mode fraction, bulk projected area <A>, bulk volume <V>, effective radius r_eff. The information is for mixed sample number 0 to 11, each corresponds to one row.Added refractive indices for chlorite, mica, smectite, pyroxene, vermiculite and pyroxenes. These groups can be applied in some other models.

Version 1.0, uploaded 01/02/2024.

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.

 

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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 9 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. Chlorite, Mica and Vermiculite group are mentioned in some studies, and we included the refractive indices for these minerals as well.

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 (excluding phase matrices)'mixqx.dat' 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.

'mixbkx.dat' files format (from left to right columns): P11(pi) P12(pi) P22(pi) P33(pi) P34(pi) P44(pi).

'x' refers to the number at the end of the file name. It can be 100 ~ 112, each represents a setting of coarse and fine mode effective radius and volume fraction (see details in "reff.dat")

'reff.dat' contains the effective radius information of the mixture. It has 7 columns: File number "x", Fine mode volume fraction, Fine mode effective radius (µm), Coarse mode effective radius (µm), Bulk projected area (µm^2), Bulk volume (µm^3), Bulk effective radius (µm).

6) 'PhaseMatrices.tar.gz' Phase matrices data'mixphswx.dat' files contain phase matrix results at 532 nm (shortwave). From left to right: P11, P12, P22, P33, P34, P44.

'mixphlwx.dat' files contain phase matrix results at 10.5 µm (longwave).

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.

7) 'Supplemental.tar.gz'

We also include data files mentioned in the supplemental file of the paper. The adjusted source data files of the nine mineral groups are included.

The supplemental bulk property files are named based on the figure number.

8) 'AdditionalRefInd.tar.gz'

We also include additional refractive indices for chlorite, smectite, vermiculite, mica, dolomite, titanium-rich minerals, pyroxenes and soot. These data can be useful in other models.

For more detailed information and datasets, please contact: Yuheng Zhang, yuheng98@tamu.edu or yuhengz98@qq.com.