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Browsing University of Hertfordshire by Author "Chemyakin, Eduard V."
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Arrange and average algorithm for the retrieval of aerosol parameters from multiwavelength high-spectral-resolution lidar/Raman lidar data
Chemyakin, Eduard V.; Mueller, D.; Burton, Sharon P.; Kolgotin, Alexei V.; Hostetler, Chris A.; Ferrare, Richard A. (2014-10-23)We present the results of a feasibility study in which a simple, automated, and unsupervised algorithm, which we call the arrange and average algorithm, is used to infer microphysical parameters (complex refractive index, ... -
Automated, unsupervised inversion of multiwavelength lidar data with TiARA : Assessment of retrieval performance of microphysical parameters using simulated data
Mueller, Detlef; Chemyakin, Eduard V.; Kolgotin, Alexei V.; Ferrare, Richard A.; Hostetler, Chris A.; Romanov, A. (2019-06-18)We evaluate the retrieval performance of the automated, unsupervised inversion algorithm, Tikhonov Advanced Regularization Algorithm (TiARA), which is used for the autonomous retrieval of microphysical parameters of ... -
Improved identification of the solution space of aerosol microphysical properties derived from the inversion of profiles of lidar optical data, part 1: theory
Kolgotin, Alexei; Mueller, Detlef; Chemyakin, Eduard V.; Romanov, A. (2016-11-30)Multiwavelength Raman/high spectral resolution lidars that measure backscatter coefficients at 355, 532, and 1064 nm and extinction coefficients at 355 and 532 nm can be used for the retrieval of particle microphysical ... -
Improved identification of the solution space of aerosol microphysical properties derived from the inversion of profiles of lidar optical data, part 2: Simulations with synthetic optical data
Kolgotin, Alexei; Mueller, Detlef; Chemyakin, Eduard V.; Romanov, A. (2016-11-30)We developed a mathematical scheme that allows us to improve retrieval products obtained from the inversion of multiwavelength Raman/HSRL lidar data, commonly dubbed “3 backscatter 2 extinction” (3β 2α) lidar. This scheme ... -
Improved identification of the solution space of aerosol microphysical properties derived from the inversion of profiles of lidar optical data, part 3: Case studies
Kolgotin, Alexei; Mueller, Detlef; Chemyakin, Eduard V.; Romanov, A.; Alehnovich, Valentin (2018-03-27)We conclude our series of publications on the development of the gradient correlation method (GCM) which can be used for an improved stabilization of the solution space of particle microphysical parameters derived from ... -
Microphysical particle properties derived from inversion algorithms developed in the framework of EARLINET
Mueller, D.; Boeckmann, C.; Kolgotin, Alexei; Schneidenbach, L.; Chemyakin, Eduard V.; Rosemann, J.; Znak, P.; Romanov, A. (2016-10-12)We present a summary on the current status of two inversion algorithms that are used in EARLINET for the inversion of data collected with EARLINET multiwavelength Raman lidars. These instruments measure backscatter coecients ... -
Retrieval of aerosol parameters from multiwavelength lidar : Investigation of underlying inverse mathematical problem
Chemyakin, Eduard V.; Burton, Sharon P.; Kolgotin, Alexei; Mueller, D.; Hostetler, Chris A.; Ferrare, Richard A. (2016-03-16)We present an investigation of some important mathematical and numerical features related to the retrieval of microphysical parameters (complex refractive index, single-scattering albedo, effective radius, total number, ... -
Vertical structure of biomass burning aerosol transported over the southeast Atlantic Ocean
Harshvardhan, Harshvardhan; Ferrare, Richard A.; Burton, Sharon P.; Hair, J. W.; Hostetler, Chris A.; Harper, David B.; Cook, Anthony; Fenn, Martha A.; Scarino, Amy Jo; Chemyakin, Eduard V.; Müller, Detlef (2022-08-03)Biomass burning in southwestern Africa produces smoke plumes that are transported over the Atlantic Ocean and overlie vast regions of stratocumulus clouds. This aerosol layer contributes to direct and indirect radiative ...