Global ETD Search
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Showing 1 to 16 of 16 for “"atmospheric waves"”.
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Implementation and Analysis of 3-D Tomographic Reconstructions from Space-Based Imaging Platforms
… signal from other emissions and reflections. The Atmospheric Waves Experiment (AWE) is a prime example for use of tomographic reconstruction techniques from an imaging space platform. AWE is designed for studying the OH-airglow layer and atmospheric waves (also called gravity waves) which cause …
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Formation and maintenance of tropical cyclone spiral bands in idealized numerical simulations
… Previous hypotheses include the manifestation of atmospheric waves emanating from the TC inner core, boundary layer instabilities, and the interaction between surface cold pools and low-level vertical wind shear. Despite much effort, no consensus has yet been reached on the underlying physical …
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Observations of long period waves in the tropical oceans and atmosphere
… baroclinic, equatorially-trapped inertia-gravity waves (discovered by Wunsch and Gill (1976)) is confirmed in the mid-Pacific by spectral analysis of long sea level records. The energy of the low-mode inertia-gravity waves is found to decrease toward the meridional boundaries. A simple spectral …
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Impact Analysis and Design Development for Air-Dropped Antarctic Seismo-Geodetic Ice Penetrator
… shelf resonant forcings caused by ocean gravity waves and atmospheric waves. Additionally, SGIP will track seismic indications of calving and rifting, facilitating better estimates of sea level rise. During operation, SGIP is dropped from an aerial vehicle, reaching a terminal velocity of 42 …
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Fabry-Perot Observations of Midlatitude Neutral Winds and Atmospheric Gravity Wave Activity
… the upper atmosphere is modulated by a number of atmospheric waves propagating upward from various sources in the lower atmosphere. Among these are atmospheric gravity waves which have been recognized as a major source of momentum and energy in the mesosphere and lower thermosphere as well as a …
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Modeling spatial covariance functions
… for example, high altitude winds or large-scale atmospheric waves propagation. This phenomenon is called teleconnection and often considered to be responsible for extreme weather events occurring simultaneously around the world. In the second part of the dissertation, a nonstationary spatial …
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On the Variation of Gravity Wave Activity through the Solar Cycle at the South Pole
<p>Atmospheric dynamics comprise of a multitude of phenomena from various sources that affect the entire climate of the globe. Some of these phenomena include Atmospheric Gravity Waves which are ubiquitous features around the planet. They are important mechanisms for the transport of momentum and …
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3D Simulator for Wind Interferometer Data-Model Comparison
… with natural fluctuations in the thermosphere, atmospheric waves, inputs from the sun and the atmosphere below etc., appear to be bigger factor than just asymmetry along the line of sight.
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Time-dependent assimilation of CTD data to an open ocean Rossby wave model
… is represented by freely propagating Rossby waves in the 1st and 2nd baroclinic modes whose time-dependent amplitudes are fit to the data at the two survey times. First the linear dispersion relation is used to evolve the waves in time, then the weak nonlinear interactions between the waves …
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Preliminary Design of a Titan-Orbiting Stellar Occultation Mission
… mission, call for an urgent need for Titan atmospheric observations able to resolve atmospheric waves. The science objectives driving the mission design include maximizing the number of measurements, the latitude versus longitude coverage, the latitude versus local solar time coverage, and …
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An investigation of wave-induced momentum flux through phase averaging of open ocean wind and wave fields
… influence of the dominant, wind-driven, surface waves on the vertical flux of horizontal momentum in the marine surface layer over open ocean conditions. Through a procedure which involves phase averaging the wind fields at the period of the dominant waves, the wave-induced component of the …
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Acoustic-Gravity Wave Propagation Based on Solutions to the Generalized Multi-component Transport Equations
<p>Nonlinear atmospheric models have provided important insight into acoustic waves generated by natural and man-made hazards, which may steepen into shocks or N-waves while also dissipating when propagating in the thermosphere. Although models have yielded results that agree with observations of …
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Investigation of Mountain Waves in the Mesosphere over the Andes Mountains
… the Andes, with the purpose of investigating the atmospheric gravity waves generated when low level wind blows over the high mountains (referred to as Mountain Waves). These types of waves are a special case of atmospheric gravity waves, which carry significant momentum and exert strong forcing to …
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Dynamical Processes of Gravity Waves Propagation and Dissipation, and Statistical Characteristics of Their Momentum Flux in the Mesosphere and Lower Thermosphere
… (MLT) (⇠80–110 km) is dominated by abundant atmospheric waves, of which gravity waves are one of the least understood due to large varieties in wave characteristics as well as potential sources. Gravity waves play an important role in the atmosphere by influencing the thermal balance and …
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Studies of gravity wave and thermal tide and their interactions in the middle atmosphere
Gravity waves (GWs) and tides are two strongest and most persistent waves in the middle atmosphere of the Earth. They are usually generated in the lower atmosphere and propagate upward to the middle and upper atmosphere, where they play important roles in the atmospheric composition, chemistry, …
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A Full-Wave Investigation of the Use of a 'Cancellation Factor' in GW-Airglow Interaction Studies
<p>Atmospheric gravity waves (GWs) perturb minor species involved in the chemical reactions of airglow emissions in the mesopause region of the earth's atmosphere. The so-called 'Cancellation Factor' (CF) is defined as a transfer function relating the amplitude of airglow brightness fluctuation to …