Research output: Thesis › Doctoral Thesis
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Original language | English |
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Qualification | PhD |
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Awarding Institution | - The University of Manchester
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Supervisors/Advisors | - Webb, Ann, Supervisor, External person
- Connolly, Paul, Supervisor, External person
- Baran, Anthony, Supervisor, External person
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Award date | 1 Dec 2015 |
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Publication status | Unpublished - Nov 2015 |
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Abstract
The 2013 meeting of the Intergovernmental Panel on Climate Change concluded that
the coupling of clouds to the Earths climate is one of the biggest uncertainties faced
in predicting climate change today. Cirrus clouds are of particular interest because the
extensive variability in particle size, shape and complexity poses a number of challenges
in the accurate modelling of optical properties. The dependence of the single-scattering
properties on particle shape demand accurate representation of the crystal geometries in
scattering models, geometries which can vary from simple hexagonal prisms to complex
multi-branched aggregates.
This work, presented as a series of papers, uses laboratory studies to investigate the
single scattering properties of ice crystals. Of particular focus here are columns with internal
cavities. The first paper investigates the phase function, P11 and asymmetry parameter,
g of varying crystal habits, whilst the second paper focuses on polarised scattering. One of
the main findings is the difference in internal structure between hollow columns grown at
warmer temperatures (􀀀7°C) and those grown at colder temperatures (􀀀30°C). Measurements
were used to create new particle geometries for use in scattering models. The
third paper makes use of findings from papers 1 & 2 to create an optical parametrization
for cirrus, utilizing the new particle geometry.
ID: 10249076