Home – Home – Jornals – Atmospheric and Oceanic Optics 2023 number 8

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 = m_real + i × m_image 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 m_image ≤ 0.010, when m^fine ≠ m^coarse. The algorithms are tested for one m^fine = 1.50 + i × 0.01 and nine m^coarse( m_real = 1.40, 1.50, and 1.60, m_image = 0.0001 and 0; m_real = 1.40, 1.50, and 1.60; m_image = 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.