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 9 of 9 for “"Tropospheric circulation"”.
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What is Driving Changes in the Tropospheric Circulation? New Insights from Simplified Models
… what has been driving changes in the large scale tropospheric circulation. First, we consider the effects of stratospheric water vapor levels, which exhibit significant changes on both interannual and decadal timescales. It is shown that idealized thermal forcings mimicking increases in …
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The Downward Influence of Ozone Depletion in the Arctic Lower Stratosphere
… has been linked to significant changes in tropospheric circulation patterns in the both hemispheres. Observed Southern Hemisphere circulation changes are easily reproduced in climate models and may be achieved by either increasing ozone depleting substances in a chemistry-climate model(CCM) …
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Downward influence of stratospheric final warming events in an idealized model
… explore the hypothesis that much of the observed tropospheric signal of the final warming is initiated from the stratosphere. Large ensembles of final warmings are simulated in an idealized dynamical core model, by imposing a radiative equilibrium temperature transition from winter to summer only in …
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Observational study of the monsoonal dynamics and eddy shedding phenomena
… atmospheric data in order to study the upper tropospheric dynamics in the area of the Asian summer monsoon. We look at summers of four years from 1987 to 1990. The divergent upper tropospheric circulation of the monsoon often adopts the form of a unified large-scale vortex. However, when the …
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The trend of wind speed over the United States during 1998 - 2011
… wind aloft, indicating that the changes in free-tropospheric circulation may also exert influence on changes in surface wind speeds for these sites.
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The representation of the Kalahari thermal low and its induced circulations over Southern Africa in observations and models
… rather than by the advection of the mid-tropospheric dry air into the convective region. During the warm phase of KTL, the anomalous surface warming induces a tropospheric subsidence that develops later into a heat dome, conducive to drought. In the cold phase, the reduced …
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The representation of the Kalahari Thermal Low and its induced circulations over southern Africa in observations and models
… rather than by the advection of the mid-tropospheric dry air into the convective region. During the warm phase of KTL, the anomalous surface warming induces a tropospheric subsidence that develops later into a heat dome, conducive to drought. In the cold phase, the reduced …
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Variability of the polar stratospheric vortex and its impact on surface climate patterns
… vortex and the effect of this variability on tropospheric weather and climate patterns on various timescales. In the first part of this work, an improved idealized model was developed to study the coupled stratosphere-troposphere system. The model is forced by relaxation to a specified …
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Midlatitude Storm Track Response to Increased Greenhouse Warming
… mechanisms inducing the changes in the general circulation of the atmosphere due to increased carbon dioxide (CO₂) by looking into the transient step-by-step adjustment of the circulation. This allows an assessment of the causality sequence in the circulation and thermal structure response prior …