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 21 for “"Planetary waves"”.
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Dynamics of planetary waves in the atmosphere
… effects of wave transience on the propagation of planetary waves in the stratosphere; (2) The coupling of the equatorial and extratropical quasi-biennial oscillations; and (3) The propagation of planetary waves between the troposphere and stratosphere; are investigated in this thesis.
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Eddy heat fluxes and stability of planetary waves
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1979.
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Oceanic planetary waves in the coupled ocean-atmosphere system
The propagation of planetary, or Rossby, waves is studied under the effects of different atmospheric couplings. First, analytical matchings are formulated in which a Rossby wave is coupled to different thermodynamical atmospheres, from a simple heat flux condition to the inclusion of an atmospheric …
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The vertical structure of stratospheric planetary waves and its variability : theory and observations
… of the vertical structure of stratospheric planetary waves reveal a large variety of structures, and a variability both on seasonal and on daily time scales. The extent to which linear wave theory explains these structures and their time evolution at a given time or season is not well known. …
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Analysis of Ionospheric Data Sets to Identify Periodic Signatures Matching Atmospheric Planetary Waves
Atmospheric planetary waves play a role in introducing variability to the low-latitude ionosphere. To better understand this coupling, this study investigates times when oscillations seen in both atmospheric planetary waves and ionospheric data-sets have similar periodicity. The planetary wave …
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The seasonal cycle of stationary planetary waves in the southern stratosphere : a numerical study
… of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
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The transport of nitric oxide in the upper atmosphere by planetary waves and the zonal mean circulation
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T18:43:06Z No. of bitstreams: 1 1982_jones.pdf: 9741338 bytes, checksum: 24ff17e826b916881fcc37f2b20a79d1 (MD5)
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A study on the vertical propagation of planetary waves and the effects of the upper boundary condition
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1979.
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Evolution of atmospheric baroclinic waves
The evolution of atmospheric baroclinic waves is investigated by a six-layer forced dissipative quasi-geostrophic $\beta$-plane channel model. In the control run, the model has: (i) a realistic zonal thermal forcing, (ii) a surface Ekman layer, a Newtonian cooling and an interior biharmonic …
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An Investigation of the Variability of Tides in the Upper Mesosphere (Meteor Radar)
… mesospheric tides. Various wind models such as planetary waves, gravity waves, and turbulence are tested and it is found that for reasonable values of atmospheric variance the two-dimensional standard deviation of the tidal estimator is at most 8 ms('-1). The observed variability of the tides at …
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Planetary Wave Activity Observed in Polar Mesospheric Clouds
… Cloud (PMC) dataset was investigated for planetary wave activity following the earlier study by <em>Merkel </em>[2002]. To counter the sparse nature of the data, four separate methods of analysis are used in determining if planetary waves are present and how they effect PMC formation. The …
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The role of wavenumber one and two in the development of sudden stratospheric warmings
In this thesis, we investigate the effects of planetary waves one and two on the polar stratosphere during boreal winter. We use MERRA reanalysis data and the FMS shallow-water model to compare and contrast their propagation into the stratosphere, their interactions within the stratosphere, and …
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The Agulhas current system above the intermediate level
… with the South East Atlantic ocean; the planetary waves in the Agulhas return current over and east of the Agulhas plateau.
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Evidence of thermal equilibration in large-scale atmospheric blocking episodes over Europe and the North Atlantic during winter
… throughout the atmospheric column. Large-scale planetary waves can remain in these equilibrated states for long time periods, as identified in previous work. Relationships between thermal equilibration and large-scale atmospheric blocking episodes however have not been explored in much detail …
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Acoustic/Gravity Wave Phenomena in Wide-Field Imaging: From Data Analysis to a Modeling Framework for Observability in the Mlt Region and Beyond
<p>Acoustic waves, gravity waves, and larger-scale tidal and planetary waves are significant drivers of the atmosphere’s dynamics and of the local and global circulation that have direct and indirect impacts on our weather and climate. Their measurements and characterization are fundamental …
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The propagation of planetary-scale waves into the upper atmosphere
An equation governing the propagation of planetary scale waves in the earth's atmosphere is derived by scaling a generalized form of Laplace's tidal equation. Quasi-analytic solutions to the propagation equation are obtained for certain model atmospheres in terms of approximate Hough functions and …
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Time-dependent ventilated thermocline
… buoyancy flux in a ventilated zone. A two-layer planetary geostrophic model is developed (chapter 2) to simulate a thermocline. The model includes some novel physical mechanisms. Most importantly, it captures the essential feature of subduction; it also is able to account for a time-varying …
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A two-mode numerical model with applications to coastal upwelling
… with the South East Atlantic ocean; the planetary waves in the Agulhas return current over and east of the Agulhas plateau. Volume flux calculations (reference 1100m.) show that the two supplies to the Agulhas current could be estimated at 15 sverdrups each. The main part of the current …
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Winter climate response to continental snow anomalies
… in Siberia, and their role in the development of planetary waves. This model-simulated pathway provides a physical explanation for how regional land surface snow anomalies can influence hemispheric-scale winter climate.
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Downward influence of stratospheric final warming events in an idealized model
… the stratosphere can affect the propagation of planetary waves from the troposphere, resulting in a burst of wave activity and the zonal wind deceleration prior to the final warming in the troposphere. We also perform a series of perturbation experiments for the sudden and final warmings to test …
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