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 60 for “"Orographic"”.
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An orographic mechanism for rapid frontogenesis
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1986.
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Orographic Precipitation Over the Island of Oahu
To demonstrate the relationship between orographic vertical motion and precipitation, a linear diagnostic upslope model has been developed to provide a high-resolution picture of terrain induced vertical motion and precipitation over the Island of Oahu. The model is called the Hawaiian Orographic …
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Orographic Gravity Wave Drag and the Large Scale Atmospheric Circulation
… the general circulation, which is affected by orographic gravity waves and the drag force that they exert on the mean flow. The effects of Orographic Gravity Wave Drag (OGWD) are what is explored in this thesis. By experimenting on the OGWD forcing in an idealized General Circulation Model. …
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The Numerical Simulation of Orographic Storms (Wales, Seeder-Feeder Mechanism, Bergeron)
… the importance of the seeder-feeder mechanism of orographic precipitation enhancement, proposed by Bergeron (1965). However, the latter study also indicated that the sensitivity of the enhancement to the low-level wind speed is much greater than predicted by the seeder-feeder model of Bader and …
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Tropical orographic rainfall regimes according to the tropical rainfall measuring mission
… variables and parameters influence tropical orographic precipitation and how these variables and parameters govern the precipitation intensity and patterns. Twelve years (1998-2009) of data are used to determine which dynamic and thermodynamic variables and derived parameters interact to …
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Dynamic and Thermodynamic Controls on the Amount and Distribution of Orographic Precipitation
… structure of mountain waves, and in turn orographic precipitation. In idealized numerical simulations, variations in the height of the tropopause are found to strongly modulate the depth and magnitude of windward ascent, resulting in a factor-of-two difference in total precipitation across …
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How does terrain influence the upscale convective growth of orographic deep moist convection?
… this transition process. This case featured an orographic supercell that transitioned into a bowing mesoscale convective system over three-to-four hours. The simulation revealed enhanced low-level vertical wind shear along the eastern slopes of the Sierras de Córdoba that aided in the formation …
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An observational and modeling study of a heavy orographic precipitation event over the Oregon Cascades
During 13--14 December 2001, a comprehensive set of observations over the central Oregon Cascades was collected as part of the IMPROVE-2 field project, permitting an unprecedented opportunity for the investigation of a heavy precipitation event over complex terrain. The collection of thermodynamic …
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Land surface and orographic controls on precipitation patterns in the Sierra Madre Occidental and Western Ghats
… act as additional, but secondary, controls on orographic precipitation that modulate the flow of moisture onshore and upslope. Both regions exhibit strong diurnal cycles in meteorological fields, land surface parameters, and convective parameters which lead to diurnal cycles of precipitation. …
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Orographic and thermodynamic processes influencing mixed-phase precipitation banding in an eastern United States winter storm
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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Investigation of the structure of natural orographic clouds embedded within atmospheric river type flow over the Payette Mountains in Idaho
The Seeded and Natural Orographic Wintertime clouds: the Idaho Experiment (SNOWIE) field campaign operated from January 7, 2017 – March 17, 2017, in the Payette Basin just northeast of Boise, ID. The goal of this campaign was to use radar and in-situ measurements to observe seeded and natural …
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The Steady-State Planetary Wave Response to Wave-Coupled Orographic Lower Boundary Forcing and Diabatic Heating in The Northern Hemisphere
A planetary wave model which is symmetric about the equator has been developed using the linear balance set of equations. The model is formulated on a sphere and spectrally truncated to 4 zonal and 7 meridional modes. There are 11 levels in the vertical with the highest computational level at 5 mb. …
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Vertical motions in orographic clouds over the Payette River Basin and their impact on cloud liquid water content: Results from SNOWIE
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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A Six Level Prognostic-Diagnostic Solution Procedure With A New Approach in Modeling of Boundary Layer Frictional Effects.
… includes vertical motion due to large-scale orographic and eddy-stress effects. The model was programmed in Fortran IV language and applied to a test case based upon initial data fields for 1200GMT, 15 December 1967. A convergent 36-hour forecast was produced. Comparisons were made with the …
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Mult-Scale Jet/Front Interactions that Organize Typical Cloud Seeding Environments in the Sierra Nevada
… favors cloud seeding which can enhance the local orographic precipitation. Most of the time, however, water vapor is not that significant and therefore forecasting cloud seeding conditions is quite challenging. Two mutually interacting frontal structures that contribute to the formation of the …
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A recent spatial, temporal, and meteorological climatology of thundersnow across the contiguous United States
… Categories that were used were cyclone, orographic, lake effect, and coastal cyclone. These categories were then analyzed and compared to identify spatial and temporal patterns. Regionally, hotspots were found in the Great Plains to the Upper Midwest, Colorado, the East Coast, and areas …
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Stable isotope paleohydrology of pedogenic carbonates in the Wayan Formation (Albian) from the wedge-top depozone in the North American Cretaceous Western Interior Basin
… with negative P-E balances in the orographic rain shadow. Stratigraphic sections in the Wayan Formation of Idaho (WF) were sampled from the wedge-top depozone. The units consist of stacked m-scale mudstone paleosols separated by m-scale sandstone-siltstone beds. Sections were …
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The role of wind and water in shaping earth's plateaus
… in the role of plateaus to act as efficient orographic barriers to rainfall and to force changes in atmospheric flow. The thesis examines the complex topics of tectonic and climatic forcing of the surface-process regime on three different spatial and temporal scales: (1) bedrock wind-erosion …
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Aerosol-cloud-precipitation interaction based on remote sensing and cloud-resolving modeling over the Central Himalayas
… Central Himalayan region experiences pronounced orographic precipitation related to the South Asian summer monsoon, typically occurring from June to September. Atmospheric aerosols can influence regional and global climate through aerosol-radiation (ARI) and aerosol-cloud interactions (ACI). The …
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Radar multi-sensor (RAMS) quantitative precipitation estimation (QPE)
… locale, beam blockage, beam overshooting, orographic enhancement, and the unique climactic conditions complicate the development of reliable QPE's from radar. The QPE precipitation fields evaluated in this analysis will stem from the dual polarization radar data obtained from the local NWS …
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