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.
Results
Showing 1 to 10 of 10 for “"Extratropics"”.
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Interactions between clouds and atmospheric circulation in the extratropics
In climate models, the simulation of clouds is known to be particularly problematic, leading to important biases in the climatological energy balance on regional scales, as well as to large uncertainties in the future amount of warming in response to greenhouse gas increase. This thesis explores …
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Extratropical storm tracks and the mean state of the atmosphere
… extratropical cyclones, dominate weather in the extratropics, affecting the lives and livelihoods of billions of people. The results presented in this thesis connect changes in the mean state of the atmosphere to changes in the extratropical storm tracks. The Northern Hemisphere summer …
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Atmospheric Predictability in the Presence of Tropical Forcing
… improvement of extended range forecasts in the extratropics from knowledge of the tropical forcing. The model-twin approach is used to perform forecast experiments including and excluding midlatitude orography.
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Tropical transport and the seasonal variability of the subtropical "edges" in the stratosphere
… the tropics and the Northern and Southern extratropics. We examine the dependence of the mean age on advection, diffusive mixing, and quasi-horizontal transport between the tropics and the extratropics. This work provides insight into the role of the tropics in global chemical transport …
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Globale Auswirkung des Straßenverkehrs auf die chemische Zusammensetzung der Atmosphäre
… In summer, road traffic causes in northern extratropics a 3% increase of OH, and in winter a decrease of 10%. These changes in chemical composition cause an indirect radiative forcing to the atmosphere. Ozone increases due to road traffic emissions (NOx, CO, NMHCs) result in an annual and …
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Understanding the Characteristics of Precipitation and Their Response to Climate Change
… First, I focus on precipitation extremes in the extratropics and aim to understand changes in vertical velocity which control the spatial variation in the climate-change response of extratropical precipitation extremes. I solve the quasi-geostrophic omega equation and attribute the vertical …
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The role of historical land-cover changes as a mechanism for global and regional climate change
… frequency waves which appear to propagate to the extratropics in well-defined teleconnection patterns, and reduced low-level easterlies over most of the topical Pacific basin under current vegetation. This implies an interaction mechanism between tropical deforestation and ENSO. The model …
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Understanding the role of stochastic atmospheric forcing in tropical Pacific decadal variability and ENSO modulation
… decadal variability can be generated in the extratropics through integration of stochastic atmospheric forcing by the ocean mixed layer. However, it remains unclear how the extratropical signal propagates into the tropical Pacific and forms a basin-wide anomaly pattern and how the resultant …
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Driving the ocean's overturning : an adjoint sensitivity study
… that region. Along the eastern boundary in the extratropics, the importance of diapycnal mixing is confined to a shallow layer at the base of the thermocline. The large vertical temperature contrast between the western and deep western boundary currents induces efficient mixing in that region. …