Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"Ice cloud."”.
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The dependence of arctic mixed phase stratus ice cloud microphysics on aerosol concentration using observations acquired during ISDAC and M-PACE
… of Canada (NRC) Convair-580, equipped with cloud and aerosol probes during 5 sorties through single-layer arctic stratocumulus on 8 April, 18 April, and 26 April 2008 during the Indirect and Semi Direct Aerosol Campaign (ISDAC) and by the University of North Dakota Citation on 4 sorties on …
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A vertically-integrated approach to climate science : from measurements and machine learning to models and policy
… play in the formation and persistence of ice clouds remains one of the most uncertain aspects of understanding past, present, and future climate. Studying how these particles influence ice cloud formation requires careful measurement of their ice nucleating ability as well as robust …
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Remote sensing of ice dynamics in the Beaufort Sea
Arctic summer sea ice extent has undergone dramatic declines over the past several decades, particularly in the Beaufort Sea. The comprehension of the sea ice decline requires an understanding of the annual sea ice retreat during the summer melt season. While there are observations of the seasonal …
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Remote Sensing of Ice Dynamics in the Beaufort Sea
Arctic summer sea ice extent has undergone dramatic declines over the past several decades, particularly in the Beaufort Sea. The comprehension of the sea ice decline requires an understanding of the annual sea ice retreat during the summer melt season. While there are observations of the seasonal …
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Atmospheric delay modeling for satellite laser altimetry
NASA's Ice, Cloud, and Land Elevation Satellite (ICESat) is a laser altimetry mission with the primary purpose of measuring the mass balance of the ice sheets of Greenland and Antarctica. It will provide 5 years of topography measurements of the ice, as well as land and ocean topography. In order …
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Simulation of the radiative flux at the martian surface between 180 and 1100 nm
… dependent abundance models of the dust and ice cloud aerosols and of the gaseous species ozone and water vapour are incorporated. Alternative aerosol distributions are also used corresponding to observations made by the Thermal Emission Spectrometer onboard Mars Global …
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Machine learning and remote sensing in the physical sciences : applications in Earth surface and atmospheric modeling.
… atmospheric systems (i. e., soil moisture and cloud formation) be accurately quantified prior to simulating water and energy transfer, where the components of flux are often difficult or impossible to observe. In this work, I employ strategies to minimize prediction uncertainty from local to …
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Radiation force modeling for ICESat precision orbit determination
Precision orbit determination (POD) for the Ice, Cloud and land Elevation Satellite (ICESat) relies on an epoch-state batch filter, in which the dynamic models play a central role. Its implementation in the Multi-Satellite Orbit Determination Program (MSODP) originally included a box-and-wing …
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A Study on the Diurnal and Seasonal Cycles of Tropical Cirrus Clouds
Tropical cirrus clouds (TCC) regulate the Earth’s radiative energy budget. However, mechanisms of the diurnal and seasonal cycles of their occurrence still require further investigation due to limited observations. This study utilizes observational data from the Cloud-Aerosol Transport System …
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Assessing the dependence of bulk ice properties from probes with anti-shatter tips on environmental conditions
Ice clouds have significant impacts on the Earth’s radiative budget. Their radiative impact highly depends on ice cloud microphysical properties. Climate and weather prediction models have to make certain assumptions about how the various processes are represented. Observations of how cloud …
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Evaluating approaches to detecting ice accretion in and around turbofan jet engines.
The accumulation of ice crystals in the compressor stages of a jet engine causes power loss events during flight that could potentially become catastrophic. The electromagnetic properties of ice clouds make them nearly undetectable to radars and hence the need for a new sensing technique. A …
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Airborne lidar observations of tropospheric arctic clouds
… sensitive to climate changes. The influence of clouds on the radiation budget is substantial, but difficult to quantify and parameterize in models. In the framework of the PhD, elastic backscatter and depolarization lidar observations of Arctic clouds were performed during the international …
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Uncertainties in space-based estimates of clouds and precipitation: implications for deriving global diabatic heating
… required to establish a global balance. Clouds and precipitation play an integral role in this exchange, enhancing reflection of solar radiation to space, trapping thermal emission from the surface, and providing a mechanism for the direct transfer of energy to the atmosphere through the …
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Observation and simulation of mid-latitude ice clouds
Knowledge of ice crystal particle size distributions (PSDs) is critical for parameterization schemes for atmospheric models and remote sensing retrieval schemes. In-situ observations are commonly used to obtain PSDs and other cloud microphysical properties. In particular, two-dimensional in situ …