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Type: Theses
Title: A lidar for cirrus and mixed phase cloud studies
Author: Curtis, Simon Andre
Issue Date: 2015
School/Discipline: School of Physical Sciences
Abstract: Cirrus and mixed phase clouds represent a major uncertainty in climate and weather models. This uncertainty can be reduced with a better understanding of the lifecycle and radiative properties of cirrus and mixed phase clouds, and by inputting local measurements into models. A cloud’s radiative properties are dependent on the thermodynamic phase of the cloud particles. Measurements made with a polarimetric lidar can be used to determine thermodynamic phase and improve our understanding of cirrus and mixed phase clouds. Few polarimetric lidar instruments are used in the southern hemisphere, representing a gap in understanding and measurements. An existing lidar instrument was upgraded and run for 6 months; 3 months with polarisation measurements. Important properties such as height, frequency of occurrence and thermodynamic phase have been measured up to heights of around 6 km. These measurements are consistent with ground and satellite based lidar, and with radiosonde measurements. Methods for determining additional properties of the clouds, such as the optical thickness and lidar ratio were researched. Sufficient measurements of cloud macrophysical properties allow for the determination of cloud microphysical properties, such as particle density and shape. To assist with determining these properties a polarimetric lidar simulation was written. Microphysical properties were not determined due to the lidar lacking sufficient range and resolution. Due to the low peak power of the laser used, increasing the range and resolution by increasing the peak power of the laser would be relatively easy.
Advisor: Hamilton, Murray Wayne
Ottaway, David J.
Dissertation Note: Thesis (M.Phil.) -- University of Adelaide, School of Physical Sciences, 2015.
Keywords: lidar
mixed phase
Provenance: This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exceptions. If you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at:
DOI: 10.4225/55/58af77f29917c
Appears in Collections:Research Theses

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