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 20 of 42 for “"cloud formation"”.
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Aerosol Condensational Growth in Cloud Formation
… unrealistically overheating. The suppression of cloud condensation nuclei (CCN) growth by high number densities was quantified by our model study. Model study with organic particles (Lmalic acid and maleic acid) indicates that when these organic species and ammonium sulfate are internally mixed, …
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An electrodynamic balance (EDB) for extraterrestrial cloud formation studies
Ice clouds scatter and absorb solar radiation, affecting atmospheric and surface temperatures (Gettelman et al., 2012). On Mars, where ice contained in clouds makes up a large portion of total atmospheric water vapor, ice clouds also alter the planetary water budget (Maltagliati et al., 2011; …
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Microphysics of atmospheric aerosols : phase transitions and cloud formation mechanisms
Clouds play an extremely important role in our atmosphere, from controlling the local weather, air pollution and chemical balance in the atmosphere to affecting long-term climatic changes at local, regional and global scales. The mechanisms through which tropospheric clouds form are still not fully …
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Numerical modeling of the early stage of cloud formation in a simulation chamber
… has been developed to simulate the growth of cloud droplets by condensation upon a spectrum of hygroscopic nuclei. The model is applicable to cloud simulation chamber conditions as well as to the study of the role of these nuclei on cloud base microstructure.</p> <p>Equations are given for the …
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A vertically-integrated approach to climate science : from measurements and machine learning to models and policy
… role anthropogenic aerosol particles 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 …
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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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Vapor scavenging by atmospheric aerosol particles
… in which particles play a role, such as cloud formation and long range transport.
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Background Flow Influence on Impulsive Jet-Driven Micro Droplet Dispersal
… The droplets are allowed to breakup by formation of sheets and evaporate using standard evaporation models. This forms droplet nuclei which directly influences the range of spread. Simulations focusing on the near-field and initial transient period of the respiratory activity show that …
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The relation between atomic and molecular gas: the Magellanic Clouds and beyond
… gas relation in the Large/Small Magellanic Clouds and 43 nearby galaxies. These galaxies demonstrate various galactic environments compared with the Milky Way and provide an ideal sample for testing the cloud-scale and galactic-scale models of the atomic-to-molecular transition and molecular …
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Trade wind cloud evolution observed by polarization radar: relationship to aerosol characteristics
One of the classical unsolved problems in cloud physics is the explanation of the observed short time between initial cloud formation and the onset of precipitation in warm clouds. Although a time interval of about 20 minutes is often quoted for initiation of warm rainfall, few field observations …
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Characterization of a 3D printed pumped counterflow virtual impactor and an aerodynamic lens concentrator
Atmospheric aerosols have an important role in cloud formation and, by extension, in the overall climate system. Field studies are required to refine the uncertainty associated with the net radiative effect of atmospheric aerosols. Two pre-existing cloud sampling devices, the pumped counterflow …
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Determining Emission Factors from Marine Vessels Employing Differential Optical Absorption Spectroscopy (DOAS) and Tunable Diode Laser Absorption Spectroscopy (TDLAS)
… to human health and impact climate by affecting cloud formation. Ship contrails are the major source of SO2 in the open-ocean and impact coastal region air quality. The International Maritime Organization (IMO) regulates SO2 emissions by requiring ships to use fuel with varying degrees of sulfur …
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On the maintenance of weak meridional temperature gradients during warm climates
… are more favorable for polar stratospheric cloud formation. Second, I examine whether the combination of high carbon dioxide and interactive, tropical cyclone dependent ocean mixing is sufficient to maintain a weak temperature gradient. I examine planetary wave generation, the energetics of …
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Comparison of cloud systems simulated with two-dimensional and three-dimensional cloud resolving models
… (2D) and three-dimensional (3D) cloud resolving models (CRM) are some of the best tools that can be used to simulate convective cloud systems and their properties relative to larger scale models. But, when attempting to understand when a certain type of CRM should be used, …
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Application of the optimal estimation method (OEM) to retrieve relative humidity from Raman Lidar backscatter measurements.
… has a large impact of the global circulation and cloud formation. Due to its high variability RH measurements in the lower atmosphere is significantly challenging. Raman lidar is one of the potential tools that can provide vertical profiles of RH. Typically, temperature and water vapor mixing …
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HOT+COLD : physical and atmospheric phenomena in the Antarctic
… rising sea levels, ozone depletion, and reduced cloud formation. And nowhere are these environmental consequences more seen than in Antarctica. Claimed as a global commons, Antarctica is ungoverned, yet under the international protection and afforded the combined preservatory efforts of these …
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Surfactant Behavior in Atmospheric Aerosols
… in the Earth climate system due to their role in cloud formation and the global radiation budget. However, there are still many unanswered questions about how the composition of the aerosol varies and how this composition affects the climate system. While aerosols contain a mix of organic and …
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Incidental Memory For Details In Scenes
… details of scenes, such as a particular cloud formation, after search. To test the relationship of time spent viewing an area and encoding of the area's details, regions of interest were isolated from the scene, based on the eye movement data collected during search, for a surprise …
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Mapping exoplanet clouds and albedo from phase curves and spectra
… to analyze the composition and occurrence of clouds on tidally locked exoplanets. We confirm that non-uniform cloud coverage on the dayside of tidally locked exoplanets will affect the magnitude and location of the maximum of the phase curve. We then apply the models to the exoplanet Kepler-7b …
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