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 18 of 18 for “"cirrus clouds"”.
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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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Dependence of tropical cirrus clouds on sea surface temperature and consequences for the Archean climate
… variations in the coverage of thin upper level clouds, in the climate of the Archean using a simple radiative-convective model that includes the effect of the variations in the area of thin cirrus clouds. First, we look at the variation in area of upper level clouds using TRMM VIRS (Tropical …
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Atmospheric radiative transfer in multiple scattering conditions. Application to NWP models.
… used in climate and weather prediction models. Cirrus clouds cover permanently 30% of the Earth's surface, representing an important contribution to the Earth-atmosphere radiation balance. The work has been focussed on the development of the RT model LBLMS. The model, widely tested in the …
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Cloud Observations from the Mars Science Laboratory Mission: Seasonal Variability, Scattering Phase Function, and Validation of Optical Depths using Lidar Measurements of Terrestrial Cirrus Clouds
… have been returned to Earth, revealing tenuous clouds that form predominantly in the autumn and winter seasons. This thesis examines the results of these cloud observations, including a detailed overview of the seasonality, opacity, spacing, and scattering properties of the clouds that appear in …
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An Investigation Of Cloud Processes Relevant To Climate Sensitivity
… are characterization of the ice fall speed in cirrus clouds, ice nucleation in cirrus clouds and ground-based remote sensing of cloud properties in ice clouds and mixed phase clouds.Studies have shown that the ice fall speed determines one of the most important climate feedback processes. The …
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Modelling of Electromagnetic Scattering at Infrared Wavelengths by Pristine Ice Crystals
Cirrus clouds have a large effect on the atmospheric system and radiative budget of earth as theyhave a huge influence in all scales of weather processes and climate. Cirrus clouds are composed ofnon-spherical ice crystals with various shapes and cover about 30%-40% globally. The …
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Satellite-based detection of contrails using deep learning
… in coverage is high [12, 2]. These artificial clouds form behind aircraft and trap outgoing infrared radiation, leading to a warming effect [12, 3, 28, 40, 3]. With aviation forecast to contribute up to 15% of total anthropogenic warming by 2050 [18], an accurate estimate of total …
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Limb scatter measurements of high altitude cloud distributions
Clouds have pivotal influence on the Earth's hydrological cycle and climate system because they are intricately involved in the dynamical, chemical, and radiative processes within the upper troposphere and lower stratosphere. Cirrus clouds occur at high altitude around the tropopause level and, …
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Assessment of Convectively Generated Tropical Cirrus in Global Storm-Resolving Models
Pervasive cirrus clouds in the upper troposphere and tropical tropopause layer (TTL) in- fluence the climate by altering the top-of-atmosphere radiation balance and stratospheric water vapor budget. These cirrus are often associated with deep convection, which global climate models must …
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Aircraft based measurements of atmospheric Sulfur Dioxide and ground based measurements of gaseous Sulfur (VI) in the simulated internal flow of an aircraft engine: Implications for atmospheric aerosol formation
… initiate formation of contrails and perhaps even cirrus clouds.
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Investigating Elevated Aqua Modis Aerosol Optical Depth Retrievals Over The Mid-Latitude Southern Oceans
… aerosol products are ineffective in identifying cirrus clouds. Cloud residuals still exist in the AM AOD products even with the use of the most stringent cloud screening settings.</p>
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Between Glimpses of Blue for Wind Ensemble and Fixed Media
… and fixed media that uses the visual imagery of clouds as the inspiration for the piece, and as a direct influence for the form and orchestration. Cirrus, Stratus, Cumulus, Nimbocumulus, as well as my own memories and impressions associated with clouds influence each section of the piece. These …
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On intraseasonal variability in the tropics: tropical cyclones, the Madden-Julian Oscillation, and equatorial waves
… Kelvin waves. The effect of the stratosphere on cirrus clouds is also investigated. It is shown that dynamical modulation of lower stratospheric clouds, and anomalous advection of upper-tropospheric ice clouds, can explain why the MJO is stronger under easterly than westerly phases of the QBO.
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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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Studies towards assessing the effects of aviation on climate
… can affect the amount and characteristics of cirrus clouds. Soot and sulfate particles can also change the cloudiness by acting as cloud condensation nuclei. Due to the high growth in air traffic that is projected to continue, it is important to understand the effects of aviation on air …
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Quantifying and reducing the uncertainties in global contrail radiative forcing
… trails, or contrails, are line-shaped ice clouds that form in the exhaust plume of aircraft engines under sufficiently cold and humid conditions. They can persist for several hours, growing to be indistinguishable from natural cirrus clouds. Numerical simulations of contrails (including …
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Relating U.S. Cirrus Cloudiness to Surface Temperature and Global Teleconnection Indices
… region. It used datasets of manually taken cirrus cloud observations, average near-surface temperature, and teleconnection indices to examine cirrus cloudiness over the conterminous United States from 1971-1991.</p> <p> Monthly trends in cirrus cloudiness, relationships with near-surface …