Дисертації з теми "General circulation models atmosphere"
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Vimont, Daniel J. "The seasonal footprinting mechanism in the CSIRO coupled general circulation models and in observations /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/10074.
Повний текст джерелаDubois, Clotilde. "The role of diapycnal mixing in coupled atmosphere-ocean general circulation models." Thesis, University of Southampton, 2006. https://eprints.soton.ac.uk/63133/.
Повний текст джерелаGehlot, Swati, and Johannes Quaas. "Convection–climate feedbacks in the ECHAM5 general circulation model." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-177611.
Повний текст джерелаGrancini, Carlo. "Initial validation of an agile coupled atmosphere-ocean general circulation model." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25439/.
Повний текст джерелаSchirber, 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.
Повний текст джерелаJakob, Christian. "The representation of cloud cover in atmospheric general circulation models." Diss., lmu, 2001. http://nbn-resolving.de/urn:nbn:de:bvb:19-3281.
Повний текст джерелаMa, Liang 1962. "On the parameterization of slantwise convection in general circulation models." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=37769.
Повний текст джерелаWe first study the characteristics of conditional symmetric instability (CSI) in an environment which is also unstable for conditional upright instability (CUI). The results indicate features common to both upright and slantwise convection. This so called slantwise buoyant instability (SBI) possesses two relevant time scales and its horizontal scale can ranges from tens of km up to over one thousand km.
We then analyze the 15-year ECMWF re-analysis (ERA) data to compute the global distributions of convective available potential energy (CAPE) and slantwise convective available energy (SCAPE). We show that the potential for CSI and CUI indeed co-exists over most areas around the globe. Based on the results of the theoretical study and the data analysis, a parameterization for slantwise convection was developed and implemented into gcm11. It was found that the scheme impacts significantly the simulated general circulation by the development of a direct meridional secondary circulation. The results of the 5-year simulations show that the scheme reduces SCAPE and SCAPE residual rs over the mid-latitudes, leading to a weakening of the thermal wind and the strength of the upper-level jets. The largest improvement in the simulated climate however lies in the reduced meridional transient eddy transports of heat and zonal momentum. With the inclusion of the scheme, the eddy transports agree much more favorably with the observational analysis.
Chechelnitsky, Michael Y. (Michael Yurievich) 1972. "Adaptive error estimation in linearized ocean general circulation models." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/58516.
Повний текст джерелаIncludes bibliographical references (p. 206-211).
Data assimilation methods, such as the Kalman filter, are routinely used in oceanography. The statistics of the model and measurement errors need to be specified a priori. In this study we address the problem of estimating model and measurement error statistics from observations. We start by testing the Myers and Tapley (1976, MT) method of adaptive error estimation with low-dimensional models. We then apply the MT method in the North Pacific (5°-60° N, 132°-252° E) to TOPEX/POSEIDON sea level anomaly data, acoustic tomography data from the ATOC project, and the MIT General Circulation Model (GCM). A reduced state linear model that describes large scale internal (baroclinic) error dynamics is used. The MT method, closely related to the maximum likelihood methods of Belanger (1974) and Dee (1995), is shown to be sensitive to the initial guess for the error statistics and the type of observations. It does not provide information about the uncertainty of the estimates nor does it provide information about which structures of the error statistics can be estimated and which cannot. A new off-line approach is developed, the covariance matching approach (CMA), where covariance matrices of model-data residuals are "matched" to their theoretical expectations using familiar least squares methods. This method uses observations directly instead of the innovations sequence and is shown to be related to the MT method and the method of Fu et al. (1993). The CMA is both a powerful diagnostic tool for addressing theoretical questions and an efficient estimator for real data assimilation studies. It can be extended to estimate other statistics of the errors, trends, annual cycles, etc. Twin experiments using the same linearized MIT GCM suggest that altimetric data are ill-suited to the estimation of internal GCM errors, but that such estimates can in theory be obtained using acoustic data. After removal of trends and annual cycles, the low frequency /wavenumber (periods> 2 months, wavelengths> 16°) TOPEX/POSEIDON sea level anomaly is of the order 6 cm2. The GCM explains about 40% of that variance. By covariance matching, it is estimated that 60% of the GCM-TOPEX/POSEIDON residual variance is consistent with the reduced state linear model. The CMA is then applied to TOPEX/POSEIDON sea level anomaly data and a linearization of a global GFDL GCM. The linearization, done in Fukumori et al.(1999), uses two vertical mode, the barotropic and the first baroclinic modes. We show that the CMA method can be used with a global model and a global data set, and that the estimates of the error statistics are robust. We show that the fraction of the GCMTOPEX/ POSEIDON residual variance explained by the model error is larger than that derived in Fukumori et al.(1999) with the method of Fu et al.(1993). Most of the model error is explained by the barotropic mode. However, we find that impact of the change in the error statistics on the data assimilation estimates is very small. This is explained by the large representation error, i.e. the dominance of the mesoscale eddies in the TIP signal, which are not part of the 20 by 10 GCM. Therefore, the impact of the observations on the assimilation is very small even after the adjustment of the error statistics. This work demonstrates that simultaneous estimation of the model and measurement error statistics for data assimilation with global ocean data sets and linearized GCMs is possible. However, the error covariance estimation problem is in general highly underdetermined, much more so than the state estimation problem. In other words there exist a very large number of statistical models that can be made consistent with the available data. Therefore, methods for obtaining quantitative error estimates, powerful though they may be, cannot replace physical insight. Used in the right context, as a tool for guiding the choice of a small number of model error parameters, covariance matching can be a useful addition to the repertory of tools available to oceanographers.
by Michael Y. Chechelnitsky.
Ph.D.
Agarwal, Reema [Verfasser], and Detlef [Akademischer Betreuer] Stammer. "Improving an Atmosphere General Circulation model through Parameter Optimization / Reema Agarwal ; Betreuer: Detlef Stammer." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1124591206/34.
Повний текст джерелаShongwe, 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.
Повний текст джерелаKoster, Randal Dean. "Tracer water transport and subgrid precipitation variation within atmospheric general circulation models." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14673.
Повний текст джерелаQuaas, Johannes. "Evaluating the “critical relative humidity” as a measure of subgrid-scale variability of humidity in general circulation model cloud cover parameterizations using satellite data." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-177265.
Повний текст джерелаQuaas, Johannes, Bjorn Stevens, Philip Stier, and Ulrike Lohmann. "Interpreting the cloud cover: aerosol optical depth relationship found in satellite data using a general circulation model." Copernicus Publications, 2010. https://ul.qucosa.de/id/qucosa%3A13833.
Повний текст джерелаNicholson, W. P. "Studies of the Martian upper atmosphere with the UCL Mars thermosphere and ionosphere general circulation model." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1310428/.
Повний текст джерелаSchirber, 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.
Повний текст джерелаAnderson, Benjamin Mark. "Feedback mechanisms and constraints on climate sensitivity from a perturbed physics ensemble of general circulation models." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670120.
Повний текст джерелаHarris, Matthew James. "A new coupled middle atmosphere and thermosphere general circulation model : studies of dynamic, energetic, and photochemical coupling in the middle and upper atmosphere." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367565.
Повний текст джерелаSchemann, Vera, Bjorn Stevens, Verena Grützun, and Johannes Quaas. "Scale dependency of total water variance and its implication for cloud parameterizations." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-177479.
Повний текст джерелаGehlot, Swati, and Johannes Quaas. "Convection–climate feedbacks in the ECHAM5 general circulation model: evaluation of cirrus cloud life cycles with ISCCP satellite data from aLagrangian trajectory perspective." American Meteorological Society, 2012. https://ul.qucosa.de/id/qucosa%3A13467.
Повний текст джерелаEntekhabi, 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.
Повний текст джерелаSchemann, Vera, Bjorn Stevens, Verena Grützun, and Johannes Quaas. "Scale dependency of total water variance and its implication for cloud parameterizations: Scale dependency of total water variance and its implication for cloudparameterizations." American Meteorological Society, 2013. https://ul.qucosa.de/id/qucosa%3A13462.
Повний текст джерелаKnochel, Hervé. "Développement et validation d'un modèle numérique de circulation océanique à coordonnées [sigma] pour l'étude climatique de l'Atlantique nord." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10256.
Повний текст джерелаThompson, David W. J. "Annular modes in the atmospheric general circulation /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/10057.
Повний текст джерелаDugas, 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.
Повний текст джерелаMendonca, 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.
Повний текст джерелаVettoretti, 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.
Повний текст джерелаPrivé, 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.
Повний текст джерелаIncludes bibliographical references (p. 97-98).
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 prevent low-level cross-equatorial flow and inhibit the northward transport of moisture onto the continent when there is no temperature gradient across the equator. The ocean cannot supply adequate moisture to feed the monsoon, and the ground hydrology strictly controls the behavior of the monsoon. A second set of two dimensional runs with similar continent, but with an SST gradient across the equator, result in a viable steady monsoon with low-level cross-equatorial flow providing moisture to the monsoon. The surface forcing required to induce a monsoon is reasonable given the constraints of the axisymmetric model setup. A series of three dimensional model runs with a zonally symmetric continent are made to study the role of zonally asymmetric flow on the zonal mean monsoon. It is found that greater land surface forcing is required to induce a zonally averaged monsoon circulation in the three dimensional runs than in similar axisymmetric runs. The behavior of the monsoon disturbances in the three dimensional runs is similar to the observed Asian monsoon in that there is low-level cross-equatorial flow which is southwesterly along the coastline, and in that a large-scale angular momentum conserving meridional circulation develops with ascent over the continent and subsidence in the opposite hemisphere. Moisture transport is found to play a very strong role in the monsoon dynamics in all of the model runs.
by Nikki C. Privé.
S.M.
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.
Повний текст джерелаThe zonally averaged meridional eddy heat and momentum transports and the associated baroclinic and barotropic energy conversions are also examined. The distributions of the transports on the vertical plane agree well with observations. When compared to the observed summer 1979 distributions, some quantitative differences remain: the vertical structure of the heat transport is too baroclinic, while the momentum transport tends to be too weak. The baroclinic and barotropic conversions all show a medium scale wave signal. The time evolution of the Richardson number of the mean flow suggests that the medium scale wave is due to a finite amplitude baroclinic instability.
Yagai, Isamu. "NUMERICAL SIMULATION OF ATMOSPHERIC THERMAL TIDES WITH A GENERAL CIRCULATION MODEL." Kyoto University, 1991. http://hdl.handle.net/2433/168744.
Повний текст джерелаKyoto University (京都大学)
0048
新制・論文博士
博士(工学)
乙第7629号
論工博第2514号
新制||工||853(附属図書館)
UT51-91-T435
(主査)教授 加藤 進, 教授 深尾 昌一郎, 教授 桜井 健郎
学位規則第4条第2項該当
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.
Повний текст джерелаSaito, 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.
Повний текст джерелаMullen, 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.
Повний текст джерелаAider, 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.
Повний текст джерелаUne analyse de la co-variabilité entre la température de l'air au sol (SAT) ainsi que les précipitations en Amérique du Nord et la température de l'océan Pacifique à la surface (SST), a été faite en utilisant la méthode SVD. Le mode dominant de la SVD a révélé une relation forte entre les anomalies de la SST du mois de novembre et celles de la SAT et des précipitations hivernales. Ce lien est beaucoup plus faible en été. Le modèle GCM3 reproduit assez bien la réponse au forçage de la SST, particulièrement sur les patrons de la SAT, mais sa réponse est beaucoup moins précise en été. Les prévisions mensuelles et saisonnières de GCM3 ont aussi été analysées. Les capacités de GCM3 à prévoir les précipitations sont faibles, surtout en été où le forçage de la SST est aussi faible. De plus, le modèle ne possède pas d'habiletés notables à prédire les sécheresses dans les prairies Canadiennes. Par contre, les capacités prévisionnelles du modèle concernant la SAT et le géopotentiel à 500 hPa sont généralement assez élevées, particulièrement en hivers. Les habiletés de GCM3 sont concentrées dans le premier mois de la période de prévision, puis déclinent lorsque le délai d'émission est prolongé.
Faleiro, Frederico Augusto Martins Valtuille. "Modelagem de mudanças climáticas: do nicho fundamental à conservação da biodiversidade." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/5603.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
The climate changes are one of the major threats to the biodiversity and it is expected to increase its impact along the 21st century. The climate change affect all levels of the biodiversity from individuals to biomes, reducing the ecosystem services. Despite of this, the prediction of climate change impacts on biodiversity is still a challenge. Overcoming these issues depends on improvements in different aspects of science that support predictions of climate change impact on biodiversity. The common practice to predict the climate change impact consists in formulate ecological niche models based in the current climate and project the changes based in the future climate predicted by the climate models. However, there are some recognized limitations both in the formulation of the ecological niche model and in the use of predictions from the climate models that need to be analyzed. Here, in the first chapter we review the science behind the climate models in order to reduce the knowledge gap between the scientific community that formulate the climate models and the community that use the predictions of these models. We showed that there is not consensus about evaluate the climate models, obtain regional models with higher spatial resolution and define consensual models. However, we gave some guidelines for use the predictions of the climate models. In the second chapter, we tested if the predictions of correlative ecological niche models fitted with presence-absence match the predictions of models fitted with abundance data on the metrics of climate change impact on orchid bees in the Atlantic Forest. We found that the presence-absence models were a partial proxy of change in abundance when the output of the models was continuous, but the same was not true when the predictions were converted to binary. The orchid bees in general will decrease the abundance in the future, but will retain a good amount of suitable sites in the future and the distance to gained climatic suitable areas can be very close, despite of great variation. The change in the species richness and turnover will be mainly in the western and some regions of southern of the Atlantic Forest. In the third chapter, we discussed the drawbacks in using the estimations of realized niche instead the fundamental niche, such as overpredicting the effect of climate change on species’ extinction risk. We proposed a framework based on phylogenetic comparative and missing data methods to predict the dimensions of the fundamental niche of species with missing data. Moreover, we explore sources of uncertainty in predictions of fundamental niche and highlight future directions to overcome current limitations of phylogenetic comparative and missing data methods to improve predictions. We conclude that it is possible to make better use of the current knowledge about species’ fundamental niche with phylogenetic information and auxiliary traits to predict the fundamental niche of poorly-studied species. In the fourth chapter, we used the framework of the chapter three to test the performance of two recent phylogenetic modeling methods to predict the thermal niche of mammals. We showed that PhyloPars had better performance than Phylogenetic Eigenvector Maps in predict the thermal niche. Moreover, the error and bias had similar phylogenetic pattern for both margins of the thermal niche while they had differences in the geographic pattern. The variance in the performance was explained by taxonomic differences and not by methodological aspects. Finally, our models better predicted the upper margin than the lower margin of the thermal niche. This is a good news for predicting the effect of climate change on species without physiological data. We hope our finds can be used to improve the predictions of climate change effect on the biodiversity in future studies and support the political decisions on minimizing the effects of climate change on biodiversity.
As mudanças climáticas são uma das principais ameaças à biodiversidade e é esperado que aumente seu impacto ao longo do século XXI. As mudanças climáticas afetam todos os níveis de biodiversidade, de indivíduos à biomas, reduzindo os serviços ecossistêmicos. Apesar disso, as predições dos impactos das mudanças climáticas na biodiversidade é ainda um desafio. A superação dessas questões depende de melhorias em diferentes aspectos da ciência que dá suporte para predizer o impacto das mudanças climáticas na biodiversidade. A prática comum para predizer o impacto das mudanças climáticas consiste em formular modelos de nicho ecológico baseado no clima atual e projetar as mudanças baseadas no clima futuro predito pelos modelos climáticos. No entanto, existem algumas limitações reconhecidas na formulação do modelo de nicho ecológico e no uso das predições dos modelos climáticos que precisam ser analisadas. Aqui, no primeiro capítulo nós revisamos a ciência por detrás dos modelos climáticos com o intuito de reduzir a lacuna de conhecimentos entre a comunidade científica que formula os modelos climáticos e a comunidade que usa as predições dos modelos. Nós mostramos que não existe consenso sobre avaliar os modelos climáticos, obter modelos regionais com maior resolução espacial e definir modelos consensuais. No entanto, nós damos algumas orientações para usar as predições dos modelos climáticos. No segundo capítulo, nós testamos se as predições dos modelos correlativos de nicho ecológicos ajustados com presença-ausência são congruentes com aqueles ajustados com dados de abundância nas medidas de impacto das mudanças climáticas em abelhas de orquídeas da Mata Atlântica. Nós encontramos que os modelos com presença-ausência foram substitutos parciais das mudanças na abundância quando o resultado dos modelos foi contínuo (adequabilidade), mas o mesmo não ocorreu quando as predições foram convertidas para binárias. As espécies de abelhas, de modo geral, irão diminuir em abundância no futuro, mas reterão uma boa quantidade de locais adequados no futuro e a distância para áreas climáticas adequadas ganhadas podem estar bem próximo, apesar da grande variação. A mudança na riqueza e na substituição de espécies ocorrerá principalmente no Oeste e algumas regiões no sul da Mata Atlântica. No terceiro capítulo, nós discutimos as desvantagens no uso de estimativas do nicho realizado ao invés do nicho fundamental, como superestimar o efeito das mudanças climáticas no risco de extinção das espécies. Nós propomos um esquema geral baseado em métodos filogenéticos comparativos e métodos de dados faltantes para predizer as dimensões do nicho fundamental das espécies com dados faltantes. Além disso, nós exploramos as fontes de incerteza nas predições do nicho fundamental e destacamos direções futuras para superar as limitações atuais dos métodos comparativos filogenéticas e métodos de dados faltantes para melhorar as predições. Nós concluímos que é possível fazer melhor uso do conhecimento atual sobre o nicho fundamental das espécies com informação filogenética e caracteres auxiliares para predizer o nicho fundamental de espécies pouco estudadas. No quarto capítulo, nós usamos o esquema geral do capítulo três para testar a performance de dois novos métodos de modelagem filogenética para predizer o nicho térmico dos mamíferos. Nós mostramos que o “PhyloPars” teve uma melhor performance que o “Phylogenetic Eigenvector Maps” em predizer o nicho térmico. Além disso, o erro e o viés tiveram um padrão filogenético similar para ambas as margens do nicho térmico, enquanto eles apresentaram diferentes padrões espaciais. A variância na performance foi explicada pelas diferenças taxonômicas e não pelas diferenças em aspectos metodológicos. Finalmente, nossos modelos melhor predizem a margem superior do que a margem inferior do nicho térmico. Essa é uma boa notícia para predizer o efeito das mudanças climáticas em espécies sem dados fisiológicos. Nós esperamos que nossos resultados possam ser usados para melhorar as predições do efeito das mudanças climáticas na biodiversidade em estudos futuros e dar suporte para decisões políticas para minimização dos efeitos das mudanças climáticas na biodiversidade.
Bessières, Laurent. "Impact des marées sur la circulation générale océanique dans une perspective climatique." Phd thesis, Université Paul Sabatier - Toulouse III, 2007. http://tel.archives-ouvertes.fr/tel-00172154.
Повний текст джерелаPour examiner chacun de ces aspects, la méthode retenue consiste à paramétriser les effets de la marée dans un modèle tridimensionnel de circulation générale océanique (OGCM) dédié au climat : NEMO. Pour ce faire nous utilisons les sorties 'off line' d'un modèle hydrodynamique bidimensionnel dédié à la marée : MOG2D-G. Dans un premier temps nous déterminons et nous décrivons pour la première fois une carte de la circulation résiduelle de marée (CRM) mondiale générée par la dynamique non-linéaire de la marée. Cette CRM obtenue par l'intermédiaire de MOG2D-G est alors introduite sous la forme d'un forçage extérieur dans l'OGCM NEMO. Dans un second temps, nous examinons la dissipation de l'énergie des marées. Tout d'abord nous quantifions la fraction de l'énergie de marée qui est dissipée en chaleur, ceci afin de déterminer si, à l'instar du flux géothermal, elle est susceptible de jouer un rôle important sur la circulation abyssale. Après avoir écarté cette possibilité, nous considérons la fraction d'énergie de marée qui se dissipe localement en mélange vertical via les ondes internes : le "tidal mixing" (TM). Le TM résulte d'un transfert d'énergie du mode barotope vers les modes baroclines. Ce transfert est diagnostiqué grâce au modèle MOG2D-G et intégré dans NEMO par l'intermédiaire d'une paramétrisation du mélange turbulent vertical.
Nous concluons : (i) que l'effet des marées sur la circulation océanique grande échelle et in fine sur le climat ne peut être significatif qu'à travers le TM, (ii) que l'introduction du TM local dans les OGCM est essentielle pour représenter correctement le transport des masses d'eaux abyssales et (iii) qu'il est désormais crucial de considérer le TM engendré loin du site de génération des ondes internes
Wang, Yixiong. "Comparative planetary circulation regimes in simple general circulation models." Thesis, University of Oxford, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.669741.
Повний текст джерелаJin, 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.
Повний текст джерелаGong, 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.
Повний текст джерелаLiu, 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.
Повний текст джерелаSanter, B. D. "Regional validation of General Circulation Models." Thesis, University of East Anglia, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383549.
Повний текст джерелаWon, 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.
Повний текст джерелаPhlips, P. J. "Models of the heat-induced circulation in the tropical atmosphere." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371572.
Повний текст джерелаRing, 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.
Повний текст джерелаIncludes bibliographical references (p. 217-225).
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 temperature profile are compiled and compared to a control run with neither type of forcing. In most cases the differences in climatologies are annular mode-like, suggesting the patterns are the preferred response of the model to the forcings. The strength of the response typically increases for either an increase in the strength of the forcing, or an increase in the strength of the projection of the forcing on the model's annular mode patterns. Trials with a response which was not annular mode-like usually featured a poor projection of the forcing on the annular modes, or substantial interference with tropical dynamics. A zonally symmetric version of the model is also used to test the direct response of the model to the forcing versus the response caused by changes in eddy feedback processes. The direct forcing alone is found to be insufficient to produce either the correct strength or shape of the annular mode patterns. Instead the changes in eddy fluxes must be included to produce the correct shape and amplitude of the anomalies.
by Michael John Ring.
Ph.D.
Braine-Bonnaire, Thierry. "Etude de la variabilite intrasaisonniere de l'atmosphere tropicale simulee par un modele de circulation generale." Paris 6, 1989. http://www.theses.fr/1989PA066563.
Повний текст джерелаSaito, 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.
Повний текст джерелаGough, 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.
Повний текст джерелаIn 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.
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 numerical limitations.
The active tracer experiments examine the long term asymmetric behaviour of warm and cold surface anomalies introduced in an abrupt and gradual fashion for the lateral and isopycnal models. The thermal anomalies produce asymmetric transient responses. The abrupt and gradual changes produce the same equilibrium but different transient responses. The isopycnal case responds more rapidly and energetically than the lateral case.
Medeiros, Brian Pacheco. "Cloud-climate interactions in general circulation models." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1428862971&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Повний текст джерелаCosme, 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.
Повний текст джерелаKiss, Andrew Elek. "Dynamics of laboratory models of the wind-driven ocean circulation." View thesis entry in Australian Digital Theses Program, 2000. http://thesis.anu.edu.au/public/adt-ANU20011018.115707/index.html.
Повний текст джерелаChakraborty, 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.
Повний текст джерела