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have been archived in the GEISA aerosols databank.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. |
Table 1. Complex indices
of refraction m=p-iq of basic aerosol components
( H2O complex indices
of refraction from Zolatarev et al., 1984; other complex indices of refraction
are from WMO, 1986)
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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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Table 2. Integrated optical
properties(*)
(extinction coefficient, single scattering albedo, asymmetry factor)
of principal aerosol models (WMO, 1986, computed by Rublev,
1994)
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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Table 3. Integrated optical properties (extinction
coefficient, single scattering albedo, asymmetry factor) computed for
basic aerosol constituent by Rublev,
1994
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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:
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.
All questions and notes concerning the use of this program can be e-mailed to Mr. Alexey Chursin.