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Dissertations / Theses on the topic 'Atmospheric Energy Fluxes'

Author: Grafiati

Published: 22 June 2021

Last updated: 29 July 2025

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1

Ramstrom, William D. (William Douglas). "Tropical cyclone momentum and energy fluxes." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/59095.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2001.<br>Includes bibliographical references (leaves 82-84).<br>Many modeling studies of tropical cyclones use the bulk aerodynamic formulae to determine angular momentum and enthalpy fluxes at the sea surface. These results show that the intensification of a hurricane is very sensitive to the values of the coefficients defined in these formulae (Emanuel, 1995). Using these formulae allows the model to make bulk estimates of these fluxes as a function of wind speed, without having to cons

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2

GISOLO, DAVIDE. "Water, carbon and energy fluxes on grasslands of Western Alps: methodological issues, experimental data, hydrological modelling and atmospheric boundary layer phenomena." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2957761.

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3

Zhang, Jun. "An Airborne Investigation of the Atmospheric Boundary Layer Structure in the Hurricane Force Wind Regime." Scholarly Repository, 2007. http://scholarlyrepository.miami.edu/oa_dissertations/15.

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As part of the ONR sponsored Coupled Boundary Layer/Air-Sea Transfer (CBLAST) experiment, data from the NOAA WP-3D research aircraft measurements into major Hurricanes in the 2002-2004 seasons are analyzed to investigate the structure of the boundary layer. The turbulent fluxes of momentum and enthalpy are derived using the eddy correlation method. For the first time, the momentum and enthalpy fluxes were directly measured in the boundary layer of a hurricane with wind speeds up to 30 m/s. A new bulk parameterization of the momentum and enthalpy flux is developed. The vertical structure of t

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4

Burnett, Benjamin F. "Exploratory Eddy Covariance Measurements of Surface Heat and CO2 Fluxes in the Roughness Sublayer of an Urban Environment." PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/401.

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In this study eddy covariance was used to measure sensible heat, latent heat, and carbon dioxide fluxes for the months of August, September, and October of 2009 within the roughness sublayer (RSL) of the urban center of Portland, OR. Vehicle traffic and solar radiation were also measured for the month of October. Flux measurements were compared with measurements from other urban areas as a test of reasonableness. CO₂ fluxes were nearly always positive and were strongly correlated with the weekday diurnal traffic cycle. CO₂ fluxes averaged 6.6 μmol/m^²s, which is less than other published measu

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5

Arsego, Diogo Alessandro. "FLUXOS DE CALOR E TRANSFERÊNCIA DE ENERGIA CALORÍFICA ENTRE O OCEANO E A ATMOSFERA SOBRE ESTRUTURAS OCEÂNICAS DE MESOESCALA NO ATLÂNTICO SUL." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/10263.

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Understanding the interactions between ocean and atmosphere in regions of oceanographic fronts is of vital importance for the improvement of numerical models for weather and climate forecasting. In the South Atlantic Ocean (SAO) the meeting between the warm waters of the Brazil Current (BC) and the cold waters of the Malvinas (Falkland) Current (MC) in the region known as the Brazil-Malvinas Confluence (BMC), results in intense mesoscale oceanic activity and, for this reason, this region is considered one of the most energetic of the Global Ocean. The interactions resulting from the thermal co

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6

Lytle, William. "Coupled Evaluation of Below- and Above-Ground Energy and Water Cycle Variables from Reanalysis Products Over Five Flux Tower Sites in the U.S." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/595636.

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Reanalysis products are widely used to study the land-atmosphere exchanges of energy, water, and carbon fluxes, and have been evaluated using in situ data above or below ground. Here measurements for several years at five flux tower sites in the U.S. (with a total of 315,576 hours of data) are used for the coupled evaluation of both below- and above-ground processes from three global reanalysis products and six global land data assimilation products. All products show systematic errors in precipitation, snow depth, and the timing of the melting and onset of snow. Despite the biases in soil mo

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7

Fan, Yalin. "Effects of surface waves on air-sea momentum and energy fluxes and ocean response to hurricanes /." View online ; access limited to URI, 2007. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3276981.

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8

Ayet, Alex. "Flux de quantité de mouvement à l'interface air-mer : approche théorique du couplage entre turbulence et vagues de vent On the Impact of Long Wind-Waves on Near-Surface Turbulence and Momentum Fluxes, in Boundary-Layer Meteorology volume 174, March 2020 Scalewise return to isotropy in stratified boundary layer flows, in JGR Atmospheres 125 (16), August 2020 Scaling laws for the length scale of energy‐containing eddies in a sheared and thermally stratified atmospheric surface layer, in Geophysical Research Letters 47(23), December 2020." Thesis, Brest, 2020. http://www.theses.fr/2020BRES0038.

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Malgré de nombreuses études, le lien de causalité entre vent et vagues fait toujours l’objet de controverses : cela est dû entre autres au caractère multi-échelle d'une surface océanique réaliste, et à la présence de déferlements, qui modifient radicalement sa topologie. Dans cette thèse, ces deux questions sont abordées sous un angle théorique, à travers un modèle phénoménologique, qui relie les propriétés spectrales et moyennées de la turbulence proche de paroi en utilisant la géométrie de tourbillons attachés à celle-ci. La première partie de la thèse revisite ce modèle phénoménologique en

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9

Gavrilovic, Nikola. "Endurance improvement of mini UAVs through energy harvesting from atmospheric gusts." Thesis, Toulouse, ISAE, 2018. http://www.theses.fr/2018ESAE0024/document.

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Cette thèse a pour but de découvrir la faisabilité et le potentiel de la récupération d'énergie à partir de rafales atmosphériques pour les micro et mini véhicules aériens sans pilote. L'atmosphère sert de grande source d'énergie pouvant être récoltée afin d'accroître la performance des petits UAV sous la forme d'une autonomie et d'une autonomie étendues. Il est bien connu que de nombreuses espèces d'oiseaux utilisent diverses techniques de vol pour obtenir des performances de vol étonnantes. Compte tenu du fait que les véhicules susmentionnés partagent la taille et la vitesse de vol avec des

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10

Vogel, Christoph Alexander. "An investigation of the role of flux divergence in the turbulent kinetic energy balance of the atmospheric surface layer." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/25789.

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11

Ma, Ning, Guo-Yue Niu, Youlong Xia, et al. "A Systematic Evaluation of Noah-MP in Simulating Land-Atmosphere Energy, Water, and Carbon Exchanges Over the Continental United States." AMER GEOPHYSICAL UNION, 2017. http://hdl.handle.net/10150/626444.

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Accurate simulation of energy, water, and carbon fluxes exchanging between the land surface and the atmosphere is beneficial for improving terrestrial ecohydrological and climate predictions. We systematically assessed the Noah land surface model (LSM) with mutiparameterization options (Noah-MP) in simulating these fluxes and associated variations in terrestrial water storage (TWS) and snow cover fraction (SCF) against various reference products over 18 United States Geological Survey two-digital hydrological unit code regions of the continental United States (CONUS). In general, Noah-MP captu

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12

Schonsky, Horst Georg [Verfasser], Andre [Akademischer Betreuer] Peters, Gerd [Gutachter] Wessolek, and Jörg [Gutachter] Bachmann. "Energy and water fluxes at the soil atmosphere interface of water repellent soils / Horst Georg Schonsky ; Gutachter: Gerd Wessolek, Jörg Bachmann ; Betreuer: Andre Peters." Berlin : Technische Universität Berlin, 2015. http://d-nb.info/1156272963/34.

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13

Silva, Suzana de Souza e. Almeida. "On the influence of nonlocal heat flux on energy transport and balance in the solar atmosphere. (Sobre a influência do fluxo de calor não local sobre o transporte e balanço de energia na atmosfera solar)." Instituto Nacional de Pesquisas Espaciais (INPE), 2017. http://urlib.net/sid.inpe.br/mtc-m21b/2016/12.24.01.22.

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In the solar corona, heat flux is one of the key processes of energy transport. Since the coronal plasma can be described as weakly collisional, classical formulation for the heat flux might no longer be the most accurate description. In a medium with fewer collisions, the heat flux will have contributions not only from neighboring particles, but also from particles coming from other regions along the magnetic field line. Hence, a better description of the heat flux in this context might be offered by a nonlocal formulation. We have implemented a non local heat flux in a 3D MHD model and we in

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14

Fan, Yuanchao [Verfasser], Alexander [Akademischer Betreuer] [Gutachter] Knohl, Kerstin [Gutachter] Wiegand, and Maoyi [Gutachter] Huang. "Modeling oil palm monoculture and its associated impacts on land-atmosphere carbon, water and energy fluxes in Indonesia / Yuanchao Fan. Betreuer: Alexander Knohl. Gutachter: Alexander Knohl ; Kerstin Wiegand ; Maoyi Huang." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://d-nb.info/1103233890/34.

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15

Qu, Yongfeng. "Three-dimensional modeling of radiative and convective exchanges in the urban atmosphere." Phd thesis, Université Paris-Est, 2011. http://pastel.archives-ouvertes.fr/pastel-00666690.

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In many micrometeorological studies, building resolving models usually assumea neutral atmosphere. Nevertheless, urban radiative transfers play an important role because of their influence on the energy budget. In order to take into account atmospheric radiation and the thermal effects of the buildings in simulations of atmospheric flow and pollutant dispersion in urban areas, we have developed a three-dimensional (3D) atmospheric radiative scheme, in the atmospheric module of the Computational Fluid Dynamics model Code_Saturne. The radiative scheme was previously validated with idealized case

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16

Said, Frédérique. "Etude expérimentale de la couche limite marine : structure turbulente et flux de la surface (expérience TOXANE-T)." Toulouse 3, 1988. http://www.theses.fr/1988TOU30022.

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Le travail presente est une etude experimentale des transferts turbulents de chaleur, humidite et quantite de mouvement dans la couche limite marine. La phase experimentale (experience toscane-t) s'est deroulee en mars 1985, au large de la baie d'audierne (finistere). Le principal vecteur utilise pour le travail presente est un avion instrumente pour la physique de l'atmosphere. Ce moyen a permis de determiner une topographie des caracteristiques turbulentes, sur une echelle horizontale de l'ordre de 50km sur 50km, et de calculer les flux par la methode des correlations. Les conditions experim

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17

Daviau, Noëlie. "Études fines des échanges énergétiques entre les bâtiments et l'atmosphère urbaine." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1005/document.

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Le travail réalisé dans le cadre de cette thèse porte sur l'effet que les bâtiments exercent sur l'atmosphère urbaine et notamment sur les échanges énergétiques qui s'opèrent entre les deux systèmes. Afin de modéliser plus finement les effets thermiques du bâtiment sur les écoulements atmosphériques lors de simulations réalisées par le logiciel de CFD Code_Saturne, nous procédons au couplage de cet outil avec le modèle de bâtiment BuildSysPro. Cette bibliothèque fonctionne sous Dymola et peut calculer des matrices descriptives du bâtiment utilisables ensuite en dehors du logiciel. Ce sont donc

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18

Siefridt, Laure. "VValidation des données de vent ERS-1 et des flux de surface du CEPMMT dans le contexte de la modélisation des circulations océaniques à l'échelle d'un bassin." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE10242.

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Une validation d'ensembles de donnees relatives a la surface de l'ocean est proposee dans le contexte de la modelisation numerique realiste des circulations oceaniques. Les flux de surface (chaleur et quantite de mouvement) produits au centre europeen pour les previsions meteorologiques a moyen terme (cepmmt) sont d'abord etudies. A cette occasion, une banque de donnees des variables atmospheriques de surface du cepmmt de 1986 a 1992 est mise a la disposition de la communaute scientifique. Une validation climatologique de ces analyses, produites a l'origine dans un objectif de previsions a moy

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19

Touré, Ibrahima. "Calculs d'épaisseurs optiques : Évaluation des flux de diverses composantes au sol du rayonnement solaire, application capteur plan classique et capteur à renforcement de flux incident." Nancy 1, 1987. http://www.theses.fr/1987NAN10320.

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Étude de l'estimation des flux du rayonnement solaire à partir de paramètres météorologiques et géophysiques faciles à évaluer, dans les conditions de la zone sahélienne de l'Afrique de l'ouest. Un nouveau capteur dénommé "bac solaire muni de réflecteurs" est proposé pour surmonter le handicap du faible échauffement du capteur plan classique en début de matinée, et permettant d'obtenir une température de 100**(O)C avant 10 heures

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20

Gamel, Hervé. "Caractérisation expérimentale de l'écoulement et de la dispersion autour d'un obstacle bidimensionnel." Thesis, Ecully, Ecole centrale de Lyon, 2015. http://www.theses.fr/2015ECDL0002/document.

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Depuis une dizaine d’années, l’évolution de la puissance des ordinateurs a permis de développer l’utilisation, dans les études d’ingénierie, des simulations 3D CFD (Computational Fluid Dynamics) pour l’étude de l’atmosphère à petite échelle, en particulier pour la dispersion de polluants sur des sites industriels et urbains complexes. Compte tenu de la complexité des domaines à étudier et des ressources de calcul généralement disponibles, ces études sont la plupart du temps réalisées à l’aide des modèles RANS (Reynolds Averaged Navier-Stokes), et particulièrement avec le modèle de fermeture k

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21

Mewes, Daniel. "Large-scale Horizontal Energy Fluxes into the Arctic Analyzed Using Self-organizing Maps." 2020. https://ul.qucosa.de/id/qucosa%3A75179.

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The meridional temperature gradient between middle and high latitudes is decreasing due to Arctic amplification, which enhances the warming in the Arctic region. This change in temperature is also influencing the circulation and the horizontal energy fluxes between the mid latitudes and the Arctic, which itself might influence the Arctic additionally. The horizontal energy flux, to our best knowledge, has never been analyzed using the up-to-date method called self-organizing map (SOM). The SOM is a simple unsupervised neural network that is used to extract patterns of high-dimensional data and

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22

Falk, Ulrike. "Turbulent Fluxes of CO2, H2O and Energy in the Atmospheric Boundary Layer above Tropical Vegetation investigated by Eddy-Covariance Measurements." Doctoral thesis, 2004. http://hdl.handle.net/11858/00-1735-0000-0006-B323-2.

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23

Falk, Ulrike [Verfasser]. "Turbulent fluxes of CO2, H2O and energy in the atmospheric boundary layer above tropical vegetation investigated by Eddy-covariance measurements / vorgelegt von Ulrike Falk." 2005. http://d-nb.info/974159387/34.

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24

Khatri, Hemant. "Mesoscale Turbulence on the Ocean Surface from Satellite Altimetry." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3764.

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The dynamics captured in the ocean surface current data provided by satellite altimetry has been a subject of debate since the past decade. In particular, the contribution of surface and interior dynamics to altimetry remains unclear. One avenue to settling this issue is to compare the turbulence (for example, the nature of spectra and interscale ﬂuxes) captured by altimetry to theories of two-dimensional, surface and interior quasigeostrophic turbulence. In this thesis, we focus on mesoscales (i.e., scales of the order of few hundred kms) that are well resolved by altimetry data. Aspects of

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25

Khatri, Hemant. "Mesoscale Turbulence on the Ocean Surface from Satellite Altimetry." Thesis, 2015. http://etd.iisc.ernet.in/2005/3764.

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The dynamics captured in the ocean surface current data provided by satellite altimetry has been a subject of debate since the past decade. In particular, the contribution of surface and interior dynamics to altimetry remains unclear. One avenue to settling this issue is to compare the turbulence (for example, the nature of spectra and interscale ﬂuxes) captured by altimetry to theories of two-dimensional, surface and interior quasigeostrophic turbulence. In this thesis, we focus on mesoscales (i.e., scales of the order of few hundred kms) that are well resolved by altimetry data. Aspects of

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26

Pike-Thackray, Colin. "RECONSTRUCTION OF HIGH ARCTIC WINTER SURFACE ENERGY FLUXES." 2011. http://hdl.handle.net/10222/14167.

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Throughout the late 20th and early 21st century, the global temperature has been on the rise, a process that has been accelerated in the Arctic. The Arctic surface temperatures have risen at a factor of 3 greater rate than the global average, leading to the term Arctic Amplification of climate change. In this study, the enhanced warming of the Arctic, and the enhancement at the Arctic surface in comparison to the warming of the atmosphere aloft, is investigated through a reconstruction of the past surface energy balance by a model driven by downwelling irradiance reconstructed using radiosonde

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27

Fan, Yuanchao. "Modeling oil palm monoculture and its associated impacts on land-atmosphere carbon, water and energy fluxes in Indonesia." Doctoral thesis, 2016. http://hdl.handle.net/11858/00-1735-0000-0028-876B-4.

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In dieser Studie wird ein neues Modul “CLM-Palm” für mehrjährige Nutzpflanzen zur Modellierung einer funktionellen Gruppe (plant functional type) für Ölpalmen im Rahmen des Community Land Models (CLM4.5) entwickelt, um die Auswirkungen der Transformation eines tropischen Waldes in eine Ölpalmenplantage auf die Kohlenstoff-, Wasser- und Energieflüsse zwischen Land und Atmosphäre zu quantifizieren. Um die Morphologie der Ölpalme möglichst detailgetreu darzustellen (das heißt, dass ungefähr 40 Phytomere einen mehrschichtigen Kronenraum formen), wird in dem Modul CLM-Palm eine phänologische und p

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28

Panse, Shreyas S. "Background and Available Potential Energy in Numerical Simulations of a Boussinesq Fluid." 2013. https://scholarworks.umass.edu/theses/1002.

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In flows with stable density stratification, a portion of the gravitational potential energy is available for conversion to kinetic energy. The remainder is not and is called “background potential energy”. The partition of potential energy is analogous to the classical division of energy due to motion into its kinetic and internal components. Computing background and available potential energies is important for understanding stratified flows. In many numerical simulations, though, the Boussinesq approximations to the Navier-Stokes equations are employed. These approximations are not consisten

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29

"Understanding the interaction of wind farms and turbulent atmospheric boundary layer in a large eddy simulation framework: from periodic to LIDAR based data driven cases." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.49173.

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abstract: This thesis focuses on an improved understanding of the dynamics at different length scales of wind farms in an atmospheric boundary layer (ABL) using a series of visualization studies and Fourier, wavelet based spectral analysis using high fidelity large eddy simulation (LES). For this purpose, a robust LES based neutral ABL model at very high Reynolds number has been developed using a high order spectral element method which has been validated against the previous literature. This ABL methodology has been used as a building block to drive large wind turbine arrays or wind farms res

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30

Reuschle, Christian A. "A Neural Network based Background Supression Technique applied to Vhe Gamma Ray Data coming from the Crab Pulsar." 2008. https://scholarworks.umass.edu/theses/145.

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In this thesis we present new results for the 99.9% confidence level flux upper limits on the pulsed VHE gamma ray signal coming from the Crab pulsar. In order to achieve optimum hadronic background suppression we implement a new neural network based selection technique and apply it to Cherenkov shower imaging data from the WHIPPLE 10m IACT telescope at Mount Hopkins Arizona. Special emphasis will be given to the fact that the neural network selector is trained with real data exclusively. An energy estimator for gamma ray induced extensive air shower events has been derived from Monte Carlo si

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