title: Electromagnetic scattering with the GDT-matrix method:  an application to irregular ice particles in cirrus  
creator: Tricoli, Ugo
subject: 530
subject: 530 Physics
description: The study describes a new method to calculate electromagnetic scattering from small,  arbitrary shaped particles. It is called the Green's dyadic technique for the transition  operator (brie  y the GDT-matrix). First, the method is introduced from the general  theory of scattering (transition operator and Dyson equation) and then it is compared  with existing electromagnetic scattering models. Second, the model is used to characterize  small ice particles and to interpret single-particle scattering measurements made with  the Small Ice Detector instrument (SID). In particular, the study is focused on small  irregular particles with fractal shapes. We apply the Gaussian random sphere model in  order to give an estimation of the particle roughness. The direct comparison of the forward  scattered intensity as measured by SID and simulated by the GDT-matrix model  leads to a retrieval of the size and shape of the scatterers. Third, the single particle results  are statistically averaged to calculate many-particle optical properties in order to  evaluate radiances through the radiative transfer Monte Carlo model McArtim. Further,  the simulated radiances in near-infrared (NIR) are compared with measurements made  during the NASA-ATTREX project on board the research unmanned aircraft Global  Hawk. These comparisons lead to a remote retrieval of the thermodynamic phase of  the constituent cloud particles and provide insights on the surface of the scatterers, i.e.  rough or smooth.
date: 2015
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/19307/1/Tricoli_PHDthesis2015_3.pdf
identifier: DOI:10.11588/heidok.00019307
identifier: urn:nbn:de:bsz:16-heidok-193072
identifier:   Tricoli, Ugo  (2015) Electromagnetic scattering with the GDT-matrix method: an application to irregular ice particles in cirrus.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/19307/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng