The aerosol data base from LITMS: Indices of refraction, integrated optical properties of aerosol particles and the associated software package |
Database Files Description
Aerosol optical data from LITMS (Laboratory
for Information Technologies and Mathematical Simulation of the Institute
of Molecular Physics at the Russian Research Center "Kurchatov Institute"),
such as: integrated optical properties (e.g.extinction coefficient, asymmetry
factor, etc...) as well as refractive indices of the basic aerosol constituents
(e.g. Dust-Like, Water-Soluble, Soot, Volcanic Ash, etc...), have been
archived in the GEISA aerosols databank.
Detailed description of these data, summarized in Tables 1-3, are given in a paper by Rublev,1994. |
To download the text of the extended abstract of Rublev's paper (Word 6.0 for Windows format file) click here with the right button of the mouse and select "Save link as" item of the pop-up menu. |
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Water (liquid) |
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Dust |
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75 % H2SO4 |
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Sea salt |
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Soot |
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Volcanic ash |
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Water-soluble particles |
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Aerosol model | Basic aerosol constituent | Volume relative concentration (%) | Particle number relative concentration(**) |
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Water-Soluble Soot |
29 1 |
9.37437 10-1 6.25607 10-2 |
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Soot Dust-Like |
22 17 |
4.11069 10-1 1.64128 10-7 |
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Water-Soluble |
5 |
9.99573 10-1 |
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(*) See headers of data files for format and content description
(**) For each aerosol model, the total sum of basic aerosol constituent concentrations has to be equal to 1 (dimensionless) |
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Computation of the integrated optical properties of atmospheric aerosols from Table 3: the AERCOMP FORTRAN code The FORTRAN code AERCOMP (UNIX version) has been developed at LITMS by Rublev, 1994. It allows calculations of the above basic aerosol integrated optical properties (see Table 3) for more complex, composite aerosol models with user's selected concentrations of constituents, in the same format as the *.dat files of Tables 2,3. To download and install this software:
The aerocomp.f program uses the following files:
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Format of i_*.dat binary files:
The i_*.dat binary files delivered with the AEROCOMP software are 2D arrays (61columns x 210 lines) of real numbers (Float, 4 bytes) stored as disk files. They comprise the following data:
The s_cont1.dat file contains the same integrated optical properties (extinction coefficient, single scattering albedo, asymmetry factor, and normalization factor)and has the same format as the *.dat files from Table 3. The i_cont1.dat file has the same binary format as the above mentioned the i_*.dat files (only it corresponds to 2D array with 13 columns and 187 lines- see parameters in Table 5). The user should set up the parameters of an aerosol of interest filling up the fields of the inp_comp.dat file and then run the executable aercomp. Note that the binary file i_cont1.dat can be used as an input file for aercomp.f program in order to compose more complex aerosol models. Table 5, given as an example, describes the inp_comp.dat file corresponding to an aerosol mixture including three basic constituents: i.e., dust-like, water-soluble, and soot particles, with the respective particles number concentrations (in particles per cm3): 2.26278 10-6, 0.937437, and 0.0625607. In column 1 are the input and output parameters for computations. Column 2 gives identification of column 1 data in the aercomp.f program, and column 3 describes column 1 data. The integrated optical parameters will be computed at the wavelengths and at the angles stored in the lm_exam.dat and ug_181.dat files respectively. Note, that the wavelength and angle values stored in these files have to be within the same interval (i.e. from 0.2 to 40 microns for wavelengths and from 0 to 180 degrees for angles) as those of the lm_sh.dat and ug_204.dat files respectively. The program uses a linear interpolation algorithm to calculate the integrated optical properties at the wavelengths and angles stored in the lm_exam.dat and ug_181.dat files. |
Table 5. Example of the inp_comp.dat file delivered with this software package(*)
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n_comp - NUMBER OF BASIC AEROSOL CONSTITUENTS
13 n_m0 - NUMBER OF WAVELENGTHS TO BE USED IN CALCULATIONS(**) lm_exam.dat name_m0 - FILE FOR SELECTED WAVELENGTHS 181 n_ug0 - TOTAL NUMBER OF SELECTED ANGULAR MESH POINTS(***) ug_181.dat name_ug0 - FILE WITH ANGULAR MESH POINTS s_cont1.dat s_dat - OUTPUT FILE FOR EXTINCTION COEFFICIENTS i_cont1.dat i_dat - OUTPUT FILE FOR PHASE FUNCTION ************************************************************************** 61 n_m - NUMBER OF WAVELENGTHS TO BE USED IN CALCULATIONS i_dust.dat nc_ind - INPUT FILE FOR BASIC AEROSOL CONSTITUENT PARAMETERS 2.26278E-6 si - PARTICLE NUMBER CONCENTRATION (particle cm-3) lm_sh.dat name_m - FILE OF WAVELENGTHS 204 n_ug - TOTAL NUMBER OF ANGULAR MESH POINTS ug_204.dat name_ug - FILE OF ANGULAR MESH POINTS ************************************************************************** 61 n_m - NUMBER OF WAVELENGTHS TO BE USED IN CALCULATIONS i_w_s.dat nc_ind - INPUT FILE FOR BASIC AEROSOL CONSTITUENT PARAMETERS 0.937437 si - PARTICLE NUMBER CONCENTRATION (particle cm-3) lm_sh.dat name_m - FILE OF WAVELENGTHS 204 n_ug - TOTAL NUMBER OF ANGULAR MESH POINTS ug_204.dat name_ug - FILE OF THE ANGULAR MESH POINTS ************************************************************************** 61 n_m - NUMBER OF WAVELENGTHS TO BE USED IN CALCULATIONS i_soot.dat nc_ind - INPUT FILE FOR BASIC AEROSOL CONSTITUENT PARAMETERS 0.0625607 si - PARTICLE NUMBER CONCENTRATION (particle cm-3) lm_sh.dat name_m - FILE OF WAVELENGTHS 204 n_ug - TOTAL NUMBER OF ANGULAR MESH POINTS ug_204.dat name_ug - FILE OF THE ANGULAR MESH POINTS ************************************************************************** |
(*) Parameters in italic can
be changed by the user for own calculations. Parameters in bold should
not be changed!
(**) The parameter n_m0 should be less or equal to the total number of records in the lm_exam.dat file. (***) The parameter n_ug0 should be less or equal to the total number of records in the ug_181.dat file. |