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 39 for “"latent heat flux"”.
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Latent heat flux and South African summer rainfall variability
… if a relationship exists between oceanic latent heat flux and the summer rainfall of South Africa. Such a link would be useful for a better understanding and the prediction of monthly variability in the summer rainfall for South Africa. In order to investigate possible relationships …
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Modeling land surface processes of the midwestern United States : predicting soil moisture under a warmer climate
… the midwestern United States. The sensitivity of latent heat flux to available energy plays an important role in determining the effects of climate change on regional hydrologic cycles. An intuitive framework based on the Penman-Monteith equation was developed that identifies deficiencies in model …
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On the role of the Agulhas Current on weather and climate of South Africa
… surrounding ocean, leading to a large turbulent flux of moisture from ocean to atmosphere (also called the turbulent latent heat flux). The dynamics of ocean-atmosphere interaction above the Agulhas Current and its impact on the weather and climate of Southern Africa are not well known. This is …
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Quantifying the Sensitivity of Land-Surface Models to Hydrodynamic Stress Limitations on Transpiration
… transpiration, also provides the link between latent heat flux and carbon uptake rates. Current land-surface models couple stomata conductance and soil moisture through empirical relationships. This approach does not take advantage of recent advances in our understanding of water flow and …
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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
… by absorbing 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 …
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Improving parameterization of scalar transport through vegetation in a coupled ecosystem-atmosphere model
… canopies, taking field measurements of subcanopy latent heat flux, and testing alternative model formulations in constrained numerical experiments. A field campaign was conducted in a dense rainforest in Luquillo National Forest, Puerto Rico, to measure wind and fluxes with eddy covariance …
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Investigations of scalar transfer coefficients in fog during the Coupled Boundary Layers and Air Sea Transfer experiment : a case study
… in the determination of the momentum and scalar fluxes remains one of the main obstacles to accurate numerical forecasts in low to moderate wind conditions. For example, latent heat fluxes computed from data using direct covariance and bulk aerodynamic methods show that there is good agreement in …
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Interannual variability in cloudiness, sea surface temperature, and atmospheric circulation over the midlatitude North Pacific during summer
… probably due to the tendency for compensation by latent heat flux anomalies.Large-scale interannual and interdecadal variability in nimbostratus and SST are also coupled over the central North Pacific during summer, suggesting coincident meridional shifts in the storm track and region of strong …
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The Effect of Orbital Forcing on the MJO’s Amplitude and Phase Speed
… Additionally, a weaker damping effect from the latent heat flux is found due to the southward shift in the mean lower tropospheric westerlies.
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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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Sensitivity Analysis of Hot/Cold Pixel Selection in SEBAL Model for ET Estimation
… was to evaluate the sensitivity of instantaneous latent heat flux (LE) estimation from Surface Energy Balance Algorithm for Land (SEBAL) by changing hot/cold pixel selections. The SEBAL model was programed in a Matlab environment and applied to Lower Fox Watershed in northeast Illinois using two …
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Investigations of scalar transfer coefficients in fog during the Coupled Boundary Layers and Air Sea Transfer Experiment : a case study
… in the determination of the momentum and scalar fluxes remains one of the main obstacles to accurate numerical forecasts in low to moderate wind conditions. For example, latent heat fluxes computed from data using direct covariance and bulk aerodynamic methods show that there is good agreement in …
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Surface heat fluxes and MJO propagation through the Maritime Continent
… in terms of their propagation characteristics. Latent heat flux from CYGNSS and OAFLUX as well as CYGNSS surface winds are used to compare large-scale patterns for MJO events that do and do not propagate through the MC. Local area-averaged surface fluxes and OLR anomalies are 7-14% and 18-22% of …
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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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Exploring sensitivities of latent heat parameterizations using a coupled, integrated hydrologic model
Evapotranspiration and its energy counterpart latent heat flux are critical components of the terrestrial water and energy balances. Precipitation, runoff, condensation and groundwater flow are also significant members of the hydrologic cycle, but it is evapotranspiration that links water in the …
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A comparison of canopy evapotranspiration for maize and two perennial grasses identified as potential bioenergy crops
… approach. The combination of a 25% higher mean latent heat flux (λET) and a longer growing season resulted in miscanthus having ca 55% higher cumulative ET over the growing season compared with maize. Cumulative ET for switchgrass was also higher than maize despite similar seasonal-mean λET. …
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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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The impact of land-use and global change on water-related agro-ecosystem services in the midwest US
… 1) determine the concentration at which soybean latent heat flux (λET) is sensitive to O3, test whether decreases in λET are linked with the concentration of O3, and find whether an increase in O3 has an impact on WUE 2) determine the regional distribution of water use and WUE for Miscanthus × …
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Characterization of the impacts of the physiological response of vegetation to increasing levels of atmospheric carbon dioxide
… led to statistically significant changes in latent heat flux (LHF), temperature, and rainfall, at global to regional scales. The CO2-induced reduction in stomatal conductance decreased LHF from the surface, resulting in warming over large areas. The coupling of the physiological response to …
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Estimating Soil Moisture and Energy Fluxes Using Assimilation of Remotely Sensed Land Surface State Variables
… in the land surface models predicting these fluxes, better predictions can be obtained by assimilating hydrologically relevant remotely sensed data into the predictive models. We consider two approaches. In the first approach, we update the soil moisture profile and thus the associated energy …
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