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Manuscript Title: Software for retrieval of aerosol particle size distribution from multiwavelength lidar signals.
Authors: S. Sitarek, T. Stacewicz, M. Posyniak
Program title: APSD_Software
Catalogue identifier: AEXV_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 199(2016)53
Programming language: Delphi 2010.
Computer: PC.
Operating system: Windows XP, Vista, 7, 8, 8.1.
RAM: 37MB
Keywords: Lidar, Remote sensing, Atmospheric aerosol, Particle size distribution, Illposed problem in atmospheric physics.
Classification: 13.

Nature of problem:
Aerosol Particle Size Distribution (APSD) is a very signifficant function for evaluation of atmospheric optical properties. Remote determination of APSD might be performed with multiwavelength lidar. Retrieval of profiles of APSD from multiwavelength lidar signals is an example of ill-posed problem in the atmospheric physics (in the sense of Jacques Hadamard).

Solution method:
The approach consists in direct fit of artificial signals to the experimental signals. The artificial signals are generated using predefined aerosol particle distribution, Combination of two lognormal functions with a few free parameters is applied for the predefined APSD. The minimization technique used in the software allows finding lognormal function parameters which provide the best fit.

Additional comments:
The input signal should be located into the SIGNALS directory which is automatically created by the software. The results are presented in the main form of the software. They are also saved into the same directory from which it was loaded input file. They are saved as a BitMap as well as the ASCII files. The software returns two main sets of files: first one "APSD.bmp" and "APSD_Iet.txt", and the second one "EffectiveRadius.bmp" and "EffectiveRadius.txt".

Running time:
195 seconds for an input file consisting 12 measurement points (altitudes).