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 31 for “"radiosonde"”.
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Radiosonde High Altitude Measurements of Radiation Levels and Cosmic Ray Events
… the use of long-range radio transmitters such as radiosondes to transmit valuable data such as cosmic ray flux, geographical position, atmospheric temperature, pressure, etc. This can improve real-time radiation monitoring for aviation industry crew and passengers working in potentially higher …
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The radiosonde cluster network: A novel approach to track Lagrangian fluctuations inside atmospheric clouds
L'abstract è presente nell'allegato / the abstract is in the attachment
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Modification of the Naval Postgraduate School Lidar System
… to allow comparison of lidar profiles with radiosonde profiles preparatory to evaluation of the lidar as a monitor for changes in the boundary layer. The detector package was modified to permit day and night operation and to reduce the overlap-limited minimum measurement range. Redesign of …
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The estimation of precipitable water vapour from GPS measurements in South Africa
… sufficient accuracy to be able to supplement the radiosonde upper air measurements of the South African Weather Service (SAWS)? iv. Is the estimation of PWV as derived from the GPS observations a true reflection of reality using the radiosonde ascent measurements and numerical weather model (NWM) …
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Development, Verification, and Future Applications of a 3-DoF Entry and Descent Simulation Tool
… dispersion patterns related to autonomous radiosonde deployment on the surface of Mars.</p> <p>The EDL simulation tool is written in Matlab. The aerodynamic information used by the tool is obtained with the use of HEAT/TK. HEAT/TK is an aerodynamic coefficient solver written by The Boeing …
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Design and Development of Distributed Lower Atmospheric Instrumentation Packages
… suites. First, we present a low-cost radiosonde platform capable of simultaneous multipoint launches or high cadence back-to-back continuous launches. This radiosonde platform can do wind measurements on an approximately 60 m scale up to a minimum of 25 km. It is capable of …
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A global and tropical quasi-decadal oscillation of the atmosphere and Ocean
… with a period of around 10 years was found in radiosonde- and satellite-measured datasets of lower stratospheric temperature. Power spectrum analysis and Fourier decomposition were used to characterize the temporal and vertical manifestations of the signal, while EOF analyses were used to …
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Three-dimensional water vapor retrieval using a network of scanning compact microwave radiometers
… profiles are obtained using in-situ sensors on radiosondes and remotely using lidars, GPS ground-based networks, CPS radio occultation from satellites and a relatively small number of space-borne microwave and infrared radiometers. In-situ radiosonde measurements have excellent vertical …
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Assimilation of Meteosat Second Generation (MSG) satellite data in a regional numerical weather prediction model using a one-dimensional variational approach
… assessed comparing the analysis with independent radiosonde and satellite observations. The inclusion of satellite data brings a substantial reduction in the warm and dry biases present in the forecast model. Moreover it is shown that the retrieval profiles generated by the 1D–VAR are well …
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Wet and dry troughs over Southern Africa during early summer
… used on surface, upper-level synoptic maps and radiosonde sections. Individual and composite time-height and spatial sections are analysed for anomalies of temperature, geopotentials, kinematic, vorticity and divergence fields, dewpoint, dewpoint depression, mixing ratio, dry and total static …
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A density analysis of a developing deep trough in the westerlies.
… day period at intervals of 24 hours in a dense radiosonde network. The analysis was conducted in 2 kilometer layers from the surface to 20 kilometers with density as the primary synoptic variable. The purposes of this investigation were first, to present in detail the changes in the density …
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Assimilation of lightning data by nudging tropospheric water vapor and applications to numerical forecasts of convective events
… observations (e.g., aircraft, surface, radiosonde, satellite) are less dense or unavailable.
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Development and Evaluation of Contrail Models
… have means and medians within the range of radiosonde measurements of these quantities, suggesting that the model adequately accounts for the sensitivities of contrail properties to these parameters. Compared to the APCEMM-inferred parameters, the ERA5 weather data predicts a 3.8 times …
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The Nocturnal Low-Level Jet in Tropical West Africa: Generation and Representation in Various Data Archives
… the nocturnal low-level jet is examined using radiosonde and ultra high frequency (UHF) wind profile data gathered during the African Monsoon Multidisciplinary Analysis (AMMA) field campaign in 2006. These data, as well as output from a Weather Research and Forecasting (WRF) simulation of the …
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The influence of the Agulhas Current on two South African extreme weather events
… using regional modeling and more frequent radiosonde data.
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On the Rayleigh -Brillouin scattering in air
… from the RayleighBrillouin spectra and from the radiosonde, combined with the discrepancies between the model and the measured RBS spectra, indicate that there is room for the S6 model to be improved. On the other hand, they also reveal that air turbulence information, which---along with the …
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Climatology of the San Francisco Bay and the Initiation of Wind Reversals along the Western United States Coast Determined from AMDAR Data
… of the lower atmosphere than the twice daily radiosonde launches performed by the National Weather Service. In the San Francisco Bay area, the number of profiles from flights arriving or departing San Francisco International Airport (SFO), Oakland International Airport (OAK), and San Jose …
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Analysis and modelling of the impact of anomalous propagation on terrestrial microwave links in a subtropical region, based on long-term measurements. Statistical analysis of long-term meteorological and signal strength measurements in a subtropical region and investigation of the impact of anomalous refractivity profiles on radio propagation in terrestrial microwave wireless systems
… separated surface stations and a single radiosonde in the United Arab Emirates (UAE). Profiles of sea level, surface and upper refractivity components are statistically analysed. Three major atmospheric layers; namely 65 m, 100 m and 1 km above the ground are studied to analyse relevant …
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THUNDERCLOUD ELECTRIC FIELD SOUNDINGS WITH INSTRUMENTED FREE BALLOONS
… corona, induced in pointed rods affixed to a radiosonde, was measured as the sonde rose through a thundercloud on 21 July 1978. The storm's most vigorous activity was well to the south of Langmuir Lab. Although our instrument was carried 6000m in this direction, it did not reach the region of …
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The trend of wind speed over the United States during 1998 - 2011
Through the analysis of the high-resolution radiosonde measurements over the U.S., we identified a decreasing trend near the surface and an increasing trend at the upper levels, which is consistent with previous studies. The decreasing trend of near-surface wind speed is statistically significant …
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