Vol. 36, issue 08, article # 3
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Abstract:
In the present work, we have studied the potentials of an additional Raman channel in the IR region of spectrum for the determination of the aerosol microphysical parameters. A procedure is suggested for simultaneous retrieving the characteristics of a spherical particle, the complex refractivity index m = mreal + i × mimage and the bimodal size distribution function U(r), using laser sensing data. A possibility of a separate fraction-wise estimation of m + U(r) is studied for weakly absorbing particles for mimage ≤ 0.010, when mfine ≠ mcoarse. The algorithms are tested for one mfine = 1.50 + i × 0.01 and nine mcoarse(mreal = 1.40, 1.50, and 1.60, mimage = 0.0001 and 0; mreal = 1.40, 1.50, and 1.60; mimage = 0.0001, 0.001, and 0.01). In order to take into account the influence of the contribution from the modal particles into the total concentration, 462 empirical models of U(r) are used.
Keywords:
aerosol, lidar, optical parameters, inverse problem, microphysical characteristics
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References:
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