Global ETD Search

1	Analysis of diagnostic climate model cloud parameterisations using large-eddy simulations Rosch, Jan, Heus, Thijs, Salzmann, Marc, Mülmenstädt, Johannes, Schlemmer, Linda, Quaas, Johannes 28 April 2016 (has links) (PDF) Current climate models often predict fractional cloud cover on the basis of a diagnostic probability density function (PDF) describing the subgrid-scale variability of the total water specific humidity, qt, favouring schemes with limited complexity. Standard shapes are uniform or triangular PDFs the width of which is assumed to scale with the gridbox mean qt or the grid-box mean saturation specific humidity, qs. In this study, the qt variability is analysed from large-eddy simulations for two stratocumulus, two shallow cumulus, and one deep convective cases. We find that in most cases, triangles are a better approximation to the simulated PDFs than uniform distributions. In two of the 24 slices examined, the actual distributions were so strongly skewed that the simple symmetric shapes could not capture the PDF at all. The distribution width for either shape scales acceptably well with both the mean value of qt and qs, the former being a slightly better choice. The qt variance is underestimated by the fitted PDFs, but overestimated by the existing parameterisations. While the cloud fraction is in general relatively well diagnosed from fitted or parameterised uniform or triangular PDFs, it fails to capture cases with small partial cloudiness, and in 10 – 30% of the cases misdiagnoses clouds in clear skies or vice-versa. The results suggest choosing a parameterisation with a triangular shape, where the distribution width would scale with the grid-box mean qt using a scaling factor of 0.076. This, however, is subject to the caveat that the reference simulations examined here were partly for rather small domains and driven by idealised boundary conditions. Wolkenparametrierung Klimamodellierung Large-Eddy Simulationen Wahrscheinlichkeitsdichtefunktion cloud parameterisation climate modelling large-eddy simulations total water specific humidity probability density function ddc:551
2	Mikroklima archívů / Environment of archives Onderek, Aleš January 2018 (has links) The thesis focuses on the way inventories are stored in depositories. Later on, it develops a project of the air-conditioning system in the archive. The last part of the thesis deals with an experiment which examines the interior environment of the depository.
3	Analýza dat pro řešení problémů s vlhkostí v budovách / Analysis of Data to Solve Problems with Humidity in Buildings Nečasová, Klára January 2019 (has links) The aim of this work was to solve problems with excessive humidity in buildings using data analysis. The theoretical part of the work deals with impacts of excessive humidity on the health of building occupants and also the condition of the building structure. Data mining methods including classification, prediction, and clustering are described together with model evaluation and selection. The practical part focuses on hardware platform description and measurement scenarios. Key parameters affecting indoor relative humidity are indoor and outdoor temperature and outdoor relative humidity. The long-term measurement of the mentioned parameters was performed using the set of sensors and BeeeOn system. Measured data was used to design a system for event detection related to a humidity change. The approach to air change regulation in the room was based on natural ventilation.
4	Analysis of diagnostic climate model cloud parameterisations using large-eddy simulations: Analysis of diagnostic climate model cloud parameterisations usinglarge-eddy simulations Rosch, Jan, Heus, Thijs, Salzmann, Marc, Mülmenstädt, Johannes, Schlemmer, Linda, Quaas, Johannes January 2015 (has links) Current climate models often predict fractional cloud cover on the basis of a diagnostic probability density function (PDF) describing the subgrid-scale variability of the total water specific humidity, qt, favouring schemes with limited complexity. Standard shapes are uniform or triangular PDFs the width of which is assumed to scale with the gridbox mean qt or the grid-box mean saturation specific humidity, qs. In this study, the qt variability is analysed from large-eddy simulations for two stratocumulus, two shallow cumulus, and one deep convective cases. We find that in most cases, triangles are a better approximation to the simulated PDFs than uniform distributions. In two of the 24 slices examined, the actual distributions were so strongly skewed that the simple symmetric shapes could not capture the PDF at all. The distribution width for either shape scales acceptably well with both the mean value of qt and qs, the former being a slightly better choice. The qt variance is underestimated by the fitted PDFs, but overestimated by the existing parameterisations. While the cloud fraction is in general relatively well diagnosed from fitted or parameterised uniform or triangular PDFs, it fails to capture cases with small partial cloudiness, and in 10 – 30% of the cases misdiagnoses clouds in clear skies or vice-versa. The results suggest choosing a parameterisation with a triangular shape, where the distribution width would scale with the grid-box mean qt using a scaling factor of 0.076. This, however, is subject to the caveat that the reference simulations examined here were partly for rather small domains and driven by idealised boundary conditions. info:eu-repo/classification/ddc/551 ddc:551
5	Optimalizace vzduchotechniky wellness sportovního centra / Optimization of air conditioning of the wellness sports center Prchalová, Nikol January 2022 (has links) The diploma thesis deals with microclimate of a pool hall. This is divided into three parts. The first part describes the theoretical aspects of the environment in swimming pools in general. The second part of the diploma thesis deals with the calculation of the course of specific moisture concentration during the day in the pool hall. Different humidity concentration curves are assessed based on different electable input parameters. Subsequently, suitable setting options are evaluated in order to achieve acceptable environment in the hall in terms of humidity and optimal operating costs. The last part relates to the experimental part. This examines the measurement of evaporation under different boundary conditions and the subsequent comparison with some calculation methods for the calculation of evaporation.
6	Evaluating Near Surface Lapse Rates Over Complex Terrain Using an Embedded Micro-Logger Sensor Network in Great Basin National Park Patrick, Nathan A. 03 October 2014 (has links) No description available. Atmospheric Sciences Geography Geophysical Hydrologic Sciences Hydrology Meteorology Physical Geography Water Resource Management Environmental Science Lapse Rates Great Basin Micro-Logger Micro Logger lascar Specific Humidity Surface Temperatures Complex Terrain mountain geography National Park Hydrology Dry Adiabatic Saturated Adiabatic Environmental Lapse Rate Free Air Calibration

1

Page generated in 0.0486 seconds