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Dissertations / Theses on the topic 'Atmospheric General Circulation Model (AGCM)'

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Published: 4 June 2021

Last updated: 6 September 2023

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1

Dugas, Bernard. "Persistent circulation anomalies in observations and in a general circulation model." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74220.

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A comparative diagnostic study of upper-air persistent atmospheric events, as simulated by a general circulation model (GCM) and as observed, is presented. We start with an overview of the several theories that attempt to explain such phenomena. Particular emphasis is put on the model approach of Shutts (1983). We next show that the spatial distributions of persistent events is qualitatively similar in the GCM and observational data. The North-Atlantic events are extracted and a rotated empirical orthogonal function (REOF) analysis is done on the resulting data sets. The two REOF sets that are

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2

Mendonca, Joao M. "Studies of Venus using a comprehensive general circulation model." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:eab33b95-b66a-4d10-8696-548e1d211c9f.

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The profusion of observational data made available by the Venus Express and previous space missions, increases our need to develop numerical tools to interpret the data and improve our understanding of the Venus meteorology. The main objective of this work is to develop an improved Venus general circulation model and to study the most likely mechanisms driving the atmosphere to the current observed circulation. Our new model is an extension of a simplified version and includes a new radiative transfer scheme and convection and an adapted boundary layer scheme and dynamical core that take into

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3

Vettoretti, Guido. "Paleoclimate tests of a model of the atmospheric general circulation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ63759.pdf.

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4

Su, Lin 1966. "A diagnostic study of the summer southern hemisphere circulation of the CCC general circulation model /." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60493.

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The medium scale planetary wave regime, consisting largely of zonal wavenumbers 5-7, frequently dominate the summer Southern Hemisphere tropospheric circulation. We perform a diagnostic study of this circulation as simulated by the Canadian Climate Centre (CCC) general circulation model (GCM). The analysis of Hovmoller diagrams, space-time and zonal wavenumber spectra shows that the CCC GCM is able to simulate the observed medium scale wave regime.<br>The zonally averaged meridional eddy heat and momentum transports and the associated baroclinic and barotropic energy conversions are also exami

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5

Privé, Nikki C. 1977. "Zonally symmetric monsoon dynamics in a general circulation model." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/59100.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2002.<br>Includes bibliographical references (p. 97-98).<br>The MIT general circulation model is used with simplified setup to study steady zonally averaged monsoon circulations. Two dimensional model runs are made with a zonally symmetric continent north of 15N and a slab ocean of uniform sea surface temperature to study the applicability of axisymmetric theory. Forcing to drive the monsoon is applied by heating the subtropical land surface. The dynamical constraints of axisymmetry preve

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6

Shongwe, Mxolisi Excellent. "Performance of recalibration systems of general circulation model forecasts over southern Africa." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-07032007-102650.

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7

Nitsche, Gregor. "Some aspects of planetary-scale atmospheric variability in a low-resolution general circulation model /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/10014.

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8

Schirber, Sebastian, Daniel Klocke, Robert Pincus, Johannes Quaas, and Jeffrey L. Anderson. "Parameter estimation using data assimilation in an atmospheric general circulation model." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-177507.

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This study explores the viability of parameter estimation in the comprehensive general circulation model ECHAM6 using ensemble Kalman filter data assimilation techniques. Four closure parameters of the cumulus-convection scheme are estimated using increasingly less idealized scenarios ranging from perfect-model experiments to the assimilation of conventional observations. Updated parameter values from experiments with real observations are used to assess the error of the model state on short 6 h forecasts and on climatological timescales. All parameters converge to their default values in sing

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9

Yagai, Isamu. "NUMERICAL SIMULATION OF ATMOSPHERIC THERMAL TIDES WITH A GENERAL CIRCULATION MODEL." Kyoto University, 1991. http://hdl.handle.net/2433/168744.

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本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである<br>Kyoto University (京都大学)<br>0048<br>新制・論文博士<br>博士(工学)<br>乙第7629号<br>論工博第2514号<br>新制||工||853(附属図書館)<br>UT51-91-T435<br>(主査)教授加藤進, 教授深尾昌一郎, 教授桜井健郎<br>学位規則第4条第2項該当

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10

Mullen, Steven Lee. "On the maintenance of blocking anticyclones in a general circulation model /." Thesis, Connect to this title online; UW restricted, 1985. http://hdl.handle.net/1773/10094.

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11

Jin, Jiming. "A physically-based snow model coupled to a general circulation model for hydro-climatological studies." Diss., The University of Arizona, 2002. http://hdl.handle.net/10150/289782.

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A Snow-Atmosphere-Soil Transfer (SAST) model has been developed to extend the point snowmelt model to vegetated areas using the parameterization concepts of the Biosphere-Atmosphere Transfer Scheme (Dickinson et al. 1993). The model applications for short-grass and forest fields show that the simulated surface temperature, albedo, and snow depth have close agreement with observations. In addition, because of biases in simulated runoff in the high-latitudes, a Shuffled Complex Evolution (Sorooshian et al. 1993) scheme for automatic calibration has been connected with the SAST model to determine

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12

Aider, Rabah. "Skill of monthly and seasonal forecasts using a Canadian general circulation model." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32296.

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An analysis of the co-variability of surface air temperature and precipitation over North America and Pacific SST is conducted using an SVD analysis. The leading SVD mode revealed a strong link between November SST anomalies and winter surface air temperature (SAT) and precipitation anomalies. In summer this relationship is much weaker. In winter GCM3 captured well the Pacific SST forcing and its response, particularly on the SAT pattern, but its response is less accurate in the summer. The monthly and se

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13

Saito, Ryu. "Influence of the surface on the atmospheric circulation of Mars : study with a general circulation model /." Katlenburg-Lindau : Copernicus, 2007. http://www.gbv.de/dms/bs/toc/535034385.pdf.

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14

Gong, Gavin 1969. "The role of fractional rainfall coverage in atmospheric general circulation model hydrologic processes." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35428.

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15

Liu, Fei. "A sensitivity study of a general circulation model with enhanced shortwave atmospheric absorption." Available to US Hopkins community, 2002. http://wwwlib.umi.com/dissertations/dlnow/3068182.

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16

Won, Eric C. "Sensitivity of a general circulation inverse model to sub-grid scale parametrization coefficients." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/58432.

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17

Gough, William A. (William Arthur). "Lateral and isopycnal mixing of passive and active tracers in an ocean general circulation model." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70297.

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The parameterization of isopycnal mixing is examined in an ocean general circulation model. The results are compared to those obtained with lateral mixing.<br>In the equilibrium experiments, the isopycnal case has more gyre kinetic energy, a less intense thermohaline circulation, and less interior downwelling than the lateral case. Convection is replaced by enhanced vertical diffusion in the isopycnal case.<br>In the time dependent passive tracer experiments, the isopycnal case has smaller depth penetration of a surface released tracer. This is likely due to induced recirculation rather than n

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18

Ring, Michael J. 1979. "Annular mode-like responses to external forcings in a simple atmospheric general circulation model." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43152.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2008.<br>Includes bibliographical references (p. 217-225).<br>In this thesis, I investigate the response of a simple atmospheric general circulation model to applied forcings to learn whether the annular mode patterns are a preferred model response to the forcings. The thesis is inspired by the appearance of annular mode patterns in Earth's atmosphere in response to a number of forcings. Climatologies of the model under the influence of applied torques or perturbations to the reference

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19

Saito, Ryu [Verfasser]. "Influence of the surface on the atmospheric circulation of Mars : study with a general circulation model / von Ryu Saito." Katlenburg-Lindau : Copernicus GmbH, 2007. http://d-nb.info/994484453/34.

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20

West, Rosalind Eleanor Lunzer. "Estimation of the indirect radiative effects of aerosol on climate using a general circulation model." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:bc1cc003-cf96-4b27-aad9-75ef7045dfc3.

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The indirect effects of anthropogenic aerosols—through their interactions with clouds—are currently one of the most uncertain perturbations to the radiative energy balance at the top of the atmosphere. A crucial link between aerosol and cloud is that aerosols can act as cloud condensation nuclei (CCN). This microphysical process must be parameterised if the large-scale effects are to be represented in a general circulation model (GCM). Theoretical work presented in this thesis highlights the importance of incorporating the kinetic limitations on droplet formation in aerosol activation paramete

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21

Chakraborty, Arindam. "Impact of Orography on the Simulation of Monsoon Climate in a General Circulation Model." Thesis, Indian Institute of Science, 2004. http://hdl.handle.net/2005/76.

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Orography plays a major role in the general circulation and climate of the tropics. Although many works have been done on the impact of global orography on summer monsoon, the previous studies have examined the impact on seasonal mean scale or only during the first half of the season. Role of orography on intra-seasonal variability has not been addressed previously. Also, the proximate and remote impacts of orography have not been studied. In this thesis an atmospheric General Circulation Model (GCM) has been used to investigate the impact of global and regional orography on monsoon climate. T

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22

Demory, Marie-Estelle. "Sensitivity of the global hydrological cycle to horizontal resolution in an atmospheric general circulation model." Thesis, University of Reading, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.654493.

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23

Tran, Giang Thanh. "Developing a multi-level Gaussian process emulator of an Atmospheric General Circulation Model for palaeoclimate modelling." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/412553/.

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The study of past climates provides a unique opportunity to test our understanding of the Earth system and our confidence in climate models. The nature of this subject requires a fine balance between complexity and efficiency. While comprehensive models can capture the system’s behaviour more realistically, fast but less accurate models are capable of integrating on the long timescale associated with Palaeoclimatology. In this thesis, a statistical approach is proposed to address the limitation of our simple atmospheric module in simulating glacial climates by incorporating a statistical surro

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24

Lin, Nai Shi. "The response of the width of the Hadley cell to global warming-like thermal forcing in a simple general circulation model." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97070.

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The response of the Hadley Cell (HC) width to the global warming is investigated using a set of dry global circulation model (GCM) integrations. In the model, global warming is mimicked by two thermal forcings: a warming in the tropical upper troposphere (THR) and a warming in polar lower atmosphere (PHR). A set of model integrations for the THR case, the PHR case and both of these cases combined (TPH) are performed with both the axisymmetric (2D) and non-axisymmetric (3D) model configurations. It is found that THR results in a clear poleward expansion of the Hadley circulation. By contrast, t

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25

Schirber, Sebastian, Daniel Klocke, Robert Pincus, Johannes Quaas, and Jeffrey L. Anderson. "Parameter estimation using data assimilation in an atmospheric general circulation model: Parameter estimation using data assimilation in an atmosphericgeneral circulation model: from a perfect toward the real world." American Geophysical Union (AGU), 2013. https://ul.qucosa.de/id/qucosa%3A13463.

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This study explores the viability of parameter estimation in the comprehensive general circulation model ECHAM6 using ensemble Kalman filter data assimilation techniques. Four closure parameters of the cumulus-convection scheme are estimated using increasingly less idealized scenarios ranging from perfect-model experiments to the assimilation of conventional observations. Updated parameter values from experiments with real observations are used to assess the error of the model state on short 6 h forecasts and on climatological timescales. All parameters converge to their default values in sing

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26

Heikkilä, Ulla. "Modeling of the atmospheric transport of the cosmogenic radionuclides ¹°Be and ⁷Be using the ECHAM5-HAM general circulation model /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17516.

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27

Shamsudheen, Semeena Valiyaveetil. "Long-range atmospheric transport and total environmental fate of persistent organic pollutants : a study using a general circulation model /." Hamburg : Max-Planck-Inst. für Meteorologie, 2005. http://mpimet.mpg.de/de/web/download.php?src=max_erdsystem&file=pdfupload&id=23&filename=BzE_15.pdf.

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28

Entekhabi, Dara 1961. "Landsurface hydrology parameterization for atmospheric general circulation models : inclusion of subgrid scale spatial variability and screening with a simple climate model." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/17246.

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29

Dansereau, Véronique. "Ice shelf-ocean interactions in a general circulation model : melt-rate modulation due to mean flow and tidal currents." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78549.

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Thesis (S.M.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 121-123).<br>Interactions between the ocean circulation in sub-ice shelf cavities and the overlying ice shelf have received considerable attention in the context of observed changes in flow speeds of marine ice sheets around Antarctica. Modeling these interactions requires parameterizing the turbulent boundary laye

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30

Tsuboda, Yukimasa. "Analysis of the effect of solar irradiance variability on global sea surface temperature and climate : an investigation using the NASA, Goddard Institute for Space Studies General Circulation Model /." Access Digital Full Text version, 1995. http://pocketknowledge.tc.columbia.edu/home.php/bybib/12250417.

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Thesis (Ed.D.)--Teachers College, Columbia University, 1995.<br>Typescript; issued also on microfilm. Sponsor: Warren E. Yasso. Dissertation Committee: O. Roger Anderson. Includes bibliographical references (leaves 95-109).

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31

Cherian, Ribu, Chandrasekhar Venkataraman, Johannes Quaas, and Srinivasan Ramachandran. "GCM simulations of anthropogenic aerosol-induced changes in aerosol extinction, atmospheric heating and precipitation over India." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-176395.

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The influence of anthropogenic emissions on aerosol distributions and the hydrological cycle are examined with a focus on monsoon precipitation over the Indian subcontinent, during January 2001 to December 2005, using the European Centre for Medium-Range Weather Forecasts-Hamburg (ECHAM5.5) general circulation model extended by the Hamburg Aerosol Module (HAM). The seasonal variability of aerosol optical depth (AOD) retrieved from the MODerate Resolution Imaging Spectroradiometer (MODIS) on board the Terra and Aqua satellite is broadly well simulated (R 0.6–0.85) by the model. The spatial dist

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32

Weinmann, Julian. "Influence of the Martian regolith on the atmospheric methane and water vapour cycle." Thesis, Luleå tekniska universitet, Rymdteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-75897.

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Context. The Martian methane and water cycle are subject of ongoing research through simulation. Exchange with the subsurface has a potentially strong impact, but is often neglected. Aims. For methane, I determine if adsorption with an increased enthalpy can explain the observed seasonal variations and conflicting observations by the Trace Gas Orbiter and the Curiosity rover. For water, the impact of adsorption and ice formation in the subsurface on the global cycle is studied. A new way of initializing the soil, by running a decoupled subsurface model, is tested. Depths of stable subsurface i

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33

Widlansky, Matthew J. "Climate dynamics of the South Pacific Convergence Zone and similarities with other subtropical convergence zones in the Southern Hemisphere." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37095.

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Three semi-permanent cloud bands exist in the Southern Hemisphere extending southeastward from the equator, through the tropics, and into the subtropics. The most prominent of these features occurs in the South Pacific and is referred to as the South Pacific Convergence Zone (SPCZ). Similar convergence zones, with less intensity, exist in the South Atlantic (SACZ) and Indian (SICZ) oceans. We attempt to explain the physical mechanisms that promote the diagonal orientation of the SPCZ and the processes that determine the timescales of its variability. It is argued that the slowly varying sea su

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34

Cherian, Ribu, Chandrasekhar Venkataraman, Johannes Quaas, and Srinivasan Ramachandran. "GCM simulations of anthropogenic aerosol-induced changes in aerosol extinction, atmospheric heating and precipitation over India." Wiley, 2013. https://ul.qucosa.de/id/qucosa%3A13437.

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The influence of anthropogenic emissions on aerosol distributions and the hydrological cycle are examined with a focus on monsoon precipitation over the Indian subcontinent, during January 2001 to December 2005, using the European Centre for Medium-Range Weather Forecasts-Hamburg (ECHAM5.5) general circulation model extended by the Hamburg Aerosol Module (HAM). The seasonal variability of aerosol optical depth (AOD) retrieved from the MODerate Resolution Imaging Spectroradiometer (MODIS) on board the Terra and Aqua satellite is broadly well simulated (R 0.6–0.85) by the model. The spatial dist

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35

Goursaud, Sentia. "Variabilité climatique récente de l'Antarctique : apports des enregistrements issus de carottes de névé." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAU037/document.

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Documenter la variabilité climatique récente est nécessaire à la compréhension des mécanismes en jeu, associés au rôle du bilan de masse de l’Antarctique pour l’élévation du niveau des mers globale. Les enregistrements issus des carottes peu profondes d’Antarctique sont des données précieuses, complémentaires aux observations instrumentales et satellitaires, pour couvrir en continu l’ensemble du continent. Mesurés le long de ces carottes de glace, les isotopes stables de l’eau sont traditionnellement utilisés pour quantifier les changements passés de la température locale.Cette thèse doctorale

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36

Cosme, Emmanuel. "Cycle du soufre des moyennes et hautes latitudes Sud dans un modèle de circulation générale atmosphérique." Phd thesis, Université Joseph Fourier (Grenoble), 2002. http://tel.archives-ouvertes.fr/tel-00705168.

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L'objectif de ce travail est de contribuer à la compréhension du cycle atmosphérique du soufre en Antarctique par l'utilisation d'un Modèle de Circulation Générale Atmosphérique (MCGA). Les versions "Antarctique" et "soufre" du MCGA LMD-ZT ("Laboratoire de Météorologie Dynamique- Zoom Traceurs") ont été fusionnées pour l'étude à haute résolution Antarctique du cycle du soufre dans les moyennes et hautes latitudes Sud. Une méthode de forçage "latéral" de la circulation atmosphérique antarctique par des analyses du Centre Européen de Prévision Météorologique à Moyen Terme (CEPMMT) a été spécifiq

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37

Kumar, Suvarchal. "Impact Of Dynamical Core And Diurnal Atmosphere Occean Coupling On Simulation Of Tropical Rainfall In CAM 3.1, AGCM." Thesis, 2009. http://hdl.handle.net/2005/974.

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In first part of the study we discuss impact of dynamical core in simulation of tropical rainfall. Over years many new dynamical cores have been developed for atmospheric models to increase efficiency and reduce numerical errors. CAM3.1 gives an opportunity to study the impact of the dynamical core on simulations with its three dynamical cores namely Eulerian spectral(EUL) , Semilagrangian dynamics(SLD) and Finite volume(FV) coupled to a single parametrization package. A past study has compared dynamical cores of CAM3 in terms on tracer transport and has showed advantages using FV in terms of

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Xavier, Prince K. "Extended Range Predictability And Prediction Of Indian Summer Monsoon." Thesis, 2006. http://hdl.handle.net/2005/431.

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Indian summer monsoon (ISM) is an important component of the tropical climate system, known for its regular seasonality and abundance of rainfall over the country. The droughts and ﬂoods associated with the year-to-year variation of the average seasonal rainfall have devastating effect on people, agriculture and economy of this region. The demand for prediction of seasonal monsoon rainfall, therefore, is overwhelming. A number of attempts to predict the seasonal mean monsoon have been made over a century, but neither dynamical nor empirical models provide skillful forecasts of the extremes of

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39

Oh, Jai-Ho. "Physically-based general circulation model parameterization of clouds and their radiative interaction." Thesis, 1989. http://hdl.handle.net/1957/30052.

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40

Joubert, Alec Michael. "General circulation model simulations of Southern African regional climate." Thesis, 1994. https://hdl.handle.net/10539/25869.

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Dissertation submitted to the Faculty of Science, University of the Witwatersraild, Johannesburg for the Degree of Master of Science.<br>Six general circulation model simulations of present-day southern African climate are assessed, Each of these models are early-generation equilibrium climate models linked to simple mixed-slab oceans. Simulations of surface air temperature over the subcontinent are sensitive to the grid-scale parameterisation of convection in summer. At high latitudes, large simulation errors are caused by errors in the specification of sea-ice albedo feedbacks. Incre

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41

Bartman, Anna Gertruida. "Pattern analysis and recalibration of a perfectly forced atmospheric general circulation model." Diss., 2002. http://hdl.handle.net/2263/28465.

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Empirical techniques are developed to adjust dynamic model forecasts on the seasonal time scale for southern African summer rainfall. The techniques, called perfect prognosis and model output statistics (MOS), are utilized to statistically "recalibrate" general circulation model (GCM) large-scale fields to three equi-probable rainfall categories for December to February. The recalibration is applied to a GCM experiment where simultaneously observed sea-surface temperature (SST) fields serve as the lower boundary forcing, referred to as the simulation mode experiment. Cross-validation sensitivi

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42

Pozzer, Andrea [Verfasser]. "Simulating short lived carbonaceous compounds with an atmospheric chemistry general circulation model / Andrea Pozzer." 2007. http://d-nb.info/984535969/34.

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43

Matheson, Mark. "Baroclinic eddies in the Martian atmosphere : a general circulation model study." Thesis, 2000. http://hdl.handle.net/1957/28737.

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A variety of general circulation model experiments are performed to investigate the influence of seasonality and topography on the strength of baroclinic eddies in the Martian atmosphere. Three different models are used: a full physics model, a simplified physics model, and a zonally symmetric simplified physics model. All three models are sigma coordinate, finite difference global atmospheric circulation models that have been adapted to the Martian regime. The full physics model has previously been tested extensively by researchers at the NASA Ames Research Center. The simplified physics mode

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44

Aneesh, C. S. "Data Assimilation Experiments Using An Indian Ocean General Circulation Model." Thesis, 2006. http://hdl.handle.net/2005/358.

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Today, ocean modeling is fast developing as a versatile tool for the study of earth’s climate, local marine ecosystems and coastal engineering applications. Though the field of ocean modeling began in the early 1950s along with the development of climate models and primitive computers, even today, the state-of-the-art ocean models have their own limitations. Many issues still remain such as the uncertainity in the parameterisation of essential processes that occur on spatial and temporal scales smaller than that can be resolved in model calculations, atmospheric forcing of the ocean and the bo

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45

Tomas, Robert A. "Subseasonal variability in the Southern Hemisphere as simulated by a two-level atmospheric general circulation model." Thesis, 1987. http://hdl.handle.net/1957/29076.

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The dynamical nature of atmospheric disturbances in the Southern Hemisphere simulated by a two-level general circulation (GCM) model is studied. Time series of the dependent variables and diabatic heating components from 10 Southern Hemisphere winters (JJA) and summers (DJF) simulated by the Oregon State University two-level GCM are used. The time mean fields are presented and discussed. Variance and covariance analyses are performed to determine the geographical distribution, intensities and transport properties of high-frequency (periods between 2.5 and 10 days) and low-frequency (periods be

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46

Dixit, Vishal Vijay. "Simple Models For The Mean And Transient Intertropical Convergence Zone And Its Northward Migration." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/1533.

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Satellite data have shown that east-west oriented cloud bands, known as Intertropical convergence zone (ITCZ), propagate eastwards along the equator throughout the year and northwards during boreal summer on intraseasonal time scales. The northward propagations over Bay of Bengal have important connection with onset of south Asian monsoon and active-break cycles of the Indian monsoon. Some studies on mean structure of ITCZ have concluded that preferred location of ITCZ is governed by meridional variation of sea surface temperature (SST) while other studies have stressed the importance of heati

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47

Dhanapala, Arachchige Sachindra. "Catchment Scale Downscaling of Hydroclimatic Variables from General Circulation Model Outputs." Thesis, 2014. https://vuir.vu.edu.au/25798/.

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Climate change influences events such as droughts, floods, extreme temperatures and sea level changes and hence affects the global food production, energy generation, and water resources adversely. Rising greenhouse gas (GHG) concentrations in the atmosphere are considered the dominant cause of climate change. General Circulation Models (GCMs) are used for the projection of climate into future, accounting for the GHG concentrations. However, the coarse spatial resolution of GCM outputs does not permit their direct use in catchment scale studies. Therefore either dynamic or statistical d

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48

Jiang, Xingjian. "Role of oceanic heat transport processes in CO₂-induced warming : analysis of simulations by the OSU coupled atmosphere-ocean general circulation model." Thesis, 1986. http://hdl.handle.net/1957/29322.

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The OSU global coupled atmosphere/ocean general circulation model (A/O GCM) has been used to simulate the present (lxCO₂) climate and to investigate a CO₂-induced (2xCO₂) climate change. Previous analysis of the lxCO₂ simulation showed distinct errors in the simulated sea surface temperature (SST) and sea ice which were attributed primarily to the atmospheric GM (AGCM). Analysis of the 2xCO₂ simulation showed that the CO₂-induced warming penetrated into the ocean; this caused a delay in the equilibration of the climate system with an estimated e-folding time of 50-75 years. The present study h

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49

Rao, Samrat. "Structure of the Tropical Easterly Jet in NCAR CAM-3.1 GCM." Thesis, 2013. http://etd.iisc.ernet.in/2005/3449.

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This thesis examines the structure of the Tropical Easterly Jet (TEJ) in a General Circulation Model (GCM). The TEJ is observed only during the Indian summer monsoon period and is strongest during July and August. The jet structure simulated by an atmospheric GCM (CAM-3.1) in July has been compared with reanalysis data. The simulated TEJ was displaced westward by ~ 25◦ when compared to observations. The removal of orography had no impact on the jet structure. This demonstrated that the Tibetan Plateau did not play an important role in the location and structure of the jet. The changes in cumul

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Ghosh, Subimal. "Hydrologic Impacts Of Climate Change : Uncertainty Modeling." Thesis, 2007. http://hdl.handle.net/2005/546.

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General Circulation Models (GCMs) are tools designed to simulate time series of climate variables globally, accounting for eﬀects of greenhouse gases in the atmosphere. They attempt to represent the physical processes in the atmosphere, ocean, cryosphere and land surface. They are currently the most credible tools available for simulating the response of the global climate system to increasing greenhouse gas concentrations, and to provide estimates of climate variables (e.g. air temperature, precipitation, wind speed, pressure etc.) on a global scale. GCMs demonstrate a signiﬁcant skill at the

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