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 28 for “"Atmospheric parameters"”.
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Measuring Optical Turbulence Parameters With A Three-aperture Receiver
This thesis discusses methods to measure several atmospheric parameters related to turbulence. Techniques used by two different scintillometers based on weak turbulence theory are discussed along with a method to estimate the inner scale developed by Hill. The theory and minimization algorithm used …
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Nonlinear behavior in the propagation of atmospheric gravity waves
… data from remote sensing systems measuring upper atmospheric parameters, a tool was developed that would allow the simulation of the nonlinear aspects of the propagation of the waves thought to drive the global circulation of the mesosphere-gravity waves. The results from two numerical experiments …
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An experimental study on the effects of adverse weathers on the flight performance of an Unmanned-Aerial-System (UAS)
… to take in-situ, time-resolved measurements of atmospheric parameters, including temperature, humidity, pressure, wind direction and speed, during the flight. The measurement results of the atmospheric parameters were correlated with the UAS altitude data, and the UAS power consumption data to …
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Optical remote sensing of thermospheric emission with the Sky-Calibrated Imaging Photometer
… is a well-established approach to estimating atmospheric parameters. The neutral oxygen 844.6 nm emission line has long been considered a good candidate for estimating the oxygen density in the upper thermosphere due to its brightness and relatively simple photochemistry. The primary challenge …
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Estabilidade atmosférica em projetos eólicos: estimativa bayesiana do comprimento de Monin Obukhov e simulação do escoamento atmosférico
… wind project development. Bayesian estimates of atmospheric parameters using only average wind speed measurements of a cup anemometer and CFD simulations coupled with thermal equations are used in order to define a more consistent WRG database without acquiring more data, investment or …
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Klimawirkung von Kondensstreifen: Untersuchungen mit einem globalen atmosphärischen Zirkulationsmodell
… ambient air. In addition, possible effects on atmospheric parameters can be simulated, allowing for the determination of a climate sensitivity parameter especially for line-shaped contrails. Regional contrail cover as well as the large range of simulated optical depth values show a fair …
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Accelerating Bayesian Computation in Earth Remote Sensing Problems
Earth atmospheric remote sensing is an inverse problem that fits surface and atmospheric models to imaging spectrometer data and is critical to the analysis of the composition and biodiversity of the Earth surface. Current methods for remote sensing generally involve retrieving a point estimate of …
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Chemical composition study of Galactic stellar substructures /
… Galactic thin- and thick-disc dwarfs. The main atmospheric parameters and abundances of 21 chemical elements have been determined. The abundance pattern of programe stars has similar characteristics to those of the Galactic thick disc, which might suggest that their formation histories are …
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Development and Application of a Versatile Balloon-Borne DOAS Spectrometer for Skylight Radiance and Atmospheric Trace Gas Profile Measurements
… applied Monte Carlo RT model. The new method of atmospheric trace gas profiling by balloon-borne UV/vis limb scatter measurements is tested against simultaneous measurements of the same parameters available from in-situ, or UV/vis/near IR solar occultation observations performed on the same …
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Evaluation of effective MDTD/MRTD for FLIR from PREOS92 measurement data
… with MDTD/MRTD of a typical FLIR system. The atmospheric propagation code (SEARAD) and Planck's radiation law were employed to obtain atmospheric transmittance and path radiance. The atmospheric parameters were selected as close to the aircraft overflights as possible using PREOS 92 data as …
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Design and Development of Distributed Lower Atmospheric Instrumentation Packages
… temporal and spatial resolution measurements of atmospheric parameters such as temperature, pressure, humidity, particulate counts, wind velocity and much more. This thesis presents the development of both airborne and ground based distributed atmospheric instrumentation suites. First, we present …
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High resolution spectropolarimetric diagnostics of weak, small-scale magnetic fields in the solar photosphere
… on response functions (SIR) code to retrieve the parameters characterizing the atmosphere, tracking the dynamics of small-scale magnetism. Linear polarization features (LPFs) are found with magnetic flux density 130 − 150 G, appearing preferentially at granule-intergranular lane boundaries. The …
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Tropospheric aerosol detection over Southern Ireland using a backscatter Raman lidar
… remote sensing instrument that can measure atmospheric parameters. A Raman lidar instrument (UCLID) was established at University College Cork to contribute to the European lidar network, EARLINET. System performance tests were carried out to ensure strict data quality assurance for …
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Thermodynamic, kinematic, and radar parameters of isolated tornadoes with and without NWS warning
… anticipating. A tornado warning is issued when atmospheric conditions are imminent for formation or a tornado has already formed and been confirmed. The purpose of this research was to find what, if any, atmospheric parameters and radar variables that may differ between isolated tornadoes that …
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Point Spread Function Reconstruction for the Adaptive Optics System ALFA and its Application to Photometry
… algorithm was then tested using simulations of atmospheric turbulence. WFS signals are affected by noise, depending on the brightness of the guide star as well as the selected loop frequency; this noise has to be reliably determined in order to obtain satisfactory results from the PSF estimation …
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Análise espectroscópica detalhada de estrelas candidatas a gêmeas solares
… are defined as stars with the same mass, age, atmospheric parameters (temperature, metalicity, surface gravity) luminosity, chemical composition, evolutionary state, chromospheric activity, Li depletion, and other characteristics as the Sun. Such objects may help answer the still lingering …
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An Iterative LQR Method for Addressing Model Uncertainty in the Mars Entry Problem
… Additionally, entry vehicle dynamics and atmospheric parameters at time of flight are hard to predict. This along with the advancement of mission objectives invoke the need for a reliable, robust, and computationally reasonable method with certifiable guarantees of safe landing. Therefore, …
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High Resolution Spectra of Carbon Monoxide, Propane and Ammonia for Atmospheric Remote Sensing
<p>Spectroscopy is a critical tool for analyzing atmospheric data. Identification of atmospheric parameters such as temperature, pressure and the existence and concentrations of constituent gases via remote sensing techniques are only possible with spectroscopic data. These form the basis of model …
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Long-term climate variability at the Prince Edward Islands in the Southern Ocean
… have shown distinctive trends in ocean and atmospheric parameters such as sea surface temperature (SST), air temperature, sunshine, rainfall, air sea level pressure and wind speed and direction from the 1950s to the early 2000s, the aim of this study is to update those studies to a more …
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The impacts of Amazon deforestation on Pacific climate
… annual rainfall rates over the Amazon and other atmospheric parameters (global precipitation, surface air temperature, low cloud amount, 500 hPa vertical velocity, surface winds, and 200 hPa winds) over the eastern Pacific indicate strong relationships among these fields. Maps of these …
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