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 30 for “"sensible heat flux"”.
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The influence of urban morphology on sensible heat flux and convective rainfall distributions over Greater Manchester
… atmospheric destabilisationassociated with the heat island and surface roughness is the most significant, more sothan microphysical or moisture enhancement. However the relative importance ofthese mechanisms remains unclear.The present work reports an investigation of the effects of urban …
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The application of the surface energy balance system model to estimate evapotranspiration in South Africa
… The model was found to underestimate the sensible heat flux through setting it at the wet limit. Daily ET measured by the eddy covariance system represented 55 to 96% of the SEBS estimate, an overestimation of daily ET. The consistent underestimation of the sensible heat flux was ascribed …
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What to plant and where to plant it; Modeling the biophysical effects of North America temperate forests on climate using the Community Earth System Model
… CO₂ but also by altering albedo, latent heat flux, and sensible heat flux. In this study we used the Community Earth System Model to assess the biophysical effect of North American temperate forests on climate and how this effect changes with location, tree type, and forest management. We …
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Estimation of catchment flood potential using satellite data
… turn, is used to calculate the sensible heat flux. The sensible heat flux is used in a simple convective model to estimate the height of the atmospheric boundary layer and the velocity of an ascending parcel of air. From this the probability of convective storm occurrence and …
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Understanding changes in precipitation with climate change over wet and dry land
… loss, which are moderated by increases in sensible heat flux. Although the dry static energy flux divergence has a strong spatial pattern, cancellation between the horizontal and vertical advection terms, as well as cancellation between the dynamic and thermodynamic components of vertical …
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Impact of time and spatial averages on the energy balance closure
… because their contribution to the turbulent fluxes is missed by a fixed eddy-covariance tower measurement that has a typical averaging time of 30 minutes. In this thesis, data from the LITFASS-2003 experiment was used to investigate the impact of time and spatial averages on the energy …
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Investigation of covariability between energy fluxes and CO2 exchange over a semi-arid savanna (Kruger National Park) by Eddie Covariance Technique
… in environmental factors. By studying energy fluxes and NEE at Kruger National Park using the eddy covariance technique, the dissertation seeks to deepen our understanding of the mechanisms driving carbon exchange in semi-arid savannas and provide insights into the impact of environmental …
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Drought in Southern Africa: structure, characteristics and impacts
… Palmer Drought Severity Index. It is found that sensible heat flux is strongly correlated with potential evapotranspiration and may be a useful drought indicator. Seven droughts are identified using the drought index with most occurring in the early part of the study period (1979-1995), whilst …
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Land Cover Change and its Impacts on a Flash Flood-Producing Rain Event in Eastern Kentucky
… precipitation. LCC also modified various surface fluxes, moist static energy, planetary boundary layer height, and local-scale circulation wind circulation. The key findings were the modification in fluxes and precipitation totals. With respect to sensible heat flux (H), there was an increase to …
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Aircraft-based measurements for the identification and quantification of sources and sinks in the carbon cycle
… Finally, eddy-covariance O<sub>2</sub> and heat fluxes were measured over three east-coast forests at sites close to and far from surface eddy-covariance towers. Tower data is often used in models to represent a larger heterogeneous region. Aircraft and tower O<sub>2</sub> and sensible heat …
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The sea surface heat balance in the Benguela upwelling region
The surface heat balance of the Benguela upwelling area on the west coast of southern Africa is analysed. Measurements of the components of the heat balance were made in the St Helena Bay area from 14-21 October 1986. Additional long-term data was obtained from Alexander Bay and Cape Town. An …
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Site-specific modelling of turbulent fluxes on the Tibetan Plateau
… but such attempts require surface-specific flux data of high quality for validation. Eddy-covariance measurements are qualified for this task, but these are scarce on the Tibetan Plateau, incomplete due to quality filtering and potentially biased due to the well-known closure gap of the …
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Growth, Structure and Prediction of the Thermal Internal Boundary Layer
… towards the top of the TIBL. Measurements of sensible heat flux revealed strong undulations in TIBL structure due to transitory eddies and thermal upcurrents. Certain theoretically based predictive equations of TIBL height displayed the best overall performance out of eight selected models, …
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Trends and interannual variability in snowpack and spring season hydroclimatology in the southwestern United States
… snowpack alters soil moisture and surface energy fluxes, thus characterizing the potential for land surface-atmosphere interactions to proceed in the southwestern U.S. We study the period between snow ablation and monsoon onset and find positive linear trends in spring temperature, decreasing …
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Surface conditions effect on energy exchange at the soil surface
… tillage effects on soil thermal properties and heat flux. Study two examined surface roughness effects on soil reflectance, net radiation, and the partitioning of net radiation;Soil thermal properties were examined after planting in the row zone for three common management systems: moldboard …
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Polar föhn winds and warming over the Larsen C Ice Shelf, Antarctica
… are high due to a combination of large radiative heat flux, due to dry, clear leeside conditions, and sensible heat flux downward from the warm, well-mixed foehn flow. Climatological work suggests that such strong northwesterly cases are often responsible for high Larsen C melt rates. Case B …
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Ecosystem Consequences of Post-Fire Invasive Species in the Great Basin Desert
… ecosystem function. Non-native plants, such as cheatgrass (Bromus tectorum L.), have aggressively invaded the Western United States. Promoted by overgrazing and fire, this invasion is rapidly converting large expanses of native sagebrush to post-fire invasive communities. The objective of this …
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Modeling of oil palm energy surface fluxes and growth for Brazilian Amazon climate conditions
… good accuracy the net radiation (Rn), the latent heat flux (LE), and the net ecosystem CO 2 exchange (NEE), but it was not able to simulate with satisfactory accuracy the sensible heat flux (H) due to the lack of information on the soil physical-hydric properties. In addition, the model was able …
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Investigation of the Influence of Temperature Inversions and Turbulence on Land-atmosphere Interactions for Rolling Terrain
… quality. The models used for estimating surface fluxes such as heat, moisture, and carbon dioxide (CO2) were designed to work best in horizontally uniform, flat terrain. This is a challenge for measuring surface fluxes in non-uniform, complex terrain as these models break down especially during …
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Surface forcing of the North Atlantic: accuracy and variability
… methodology to estimate the turbulent air – sea heat and moisture fluxes and<br/>their uncertainty is developed and assessed using Voluntary Observing Ship (VOS)<br/>observations. Whilst important drivers of the global oceanic and atmospheric circulation<br/>these fluxes remain poorly quantified, …
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