eprintid: 19307
rev_number: 12
eprint_status: archive
userid: 2060
dir: disk0/00/01/93/07
datestamp: 2015-09-04 09:07:57
lastmod: 2015-09-08 11:18:34
status_changed: 2015-09-04 09:07:57
type: doctoralThesis
metadata_visibility: show
creators_name: Tricoli, Ugo
title: Electromagnetic scattering with the GDT-matrix method:
an application to irregular ice particles in cirrus

subjects: 530
divisions: 130500
adv_faculty: af-13
abstract: 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
id_scheme: DOI
id_number: 10.11588/heidok.00019307
ppn_swb: 1657780805
own_urn: urn:nbn:de:bsz:16-heidok-193072
date_accepted: 2015-07-24
advisor: HASH(0x556120b7f710)
language: eng
bibsort: TRICOLIUGOELECTROMAG2015
full_text_status: public
citation:   Tricoli, Ugo  (2015) Electromagnetic scattering with the GDT-matrix method: an application to irregular ice particles in cirrus.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/19307/1/Tricoli_PHDthesis2015_3.pdf