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Konvektionsinstabilitäten und raumzeitliche Strukturbildung in Zweischicht-SystemenMerkt, Domnic. Unknown Date (has links) (PDF)
Brandenburgische Techn. Universiẗat, Diss., 2005--Cottbus.
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Water mass circulation and variability in the subpolar North AtlanticKieke, Dagmar. Unknown Date (has links) (PDF)
University, Diss., 2005--Bremen.
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Konvektiver Wärmeübergang bei instationären Prallstrahlen mit systematisch veränderter SignalformMiddelberg, Georg January 2008 (has links)
Zugl.: Hamburg, Techn. Univ., Diss., 2008
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Basic concepts for convection parameterization in weather forecast and climate modelsYano, Jun-Ichi, Geleyn, Jean-François, Köller, Martin, Mironov, Dmitrii, Quaas, Johannes, Soares, Pedro M. M., Phillips, Vaughan T. J., Plant, Robert S., Deluca, Anna, Marquet, Pascal, Stulic, Lukrecia, Fuchs, Zeljka 25 August 2015 (has links) (PDF)
The research network “Basic Concepts for Convection Parameterization in Weather Forecast and Climate Models” was organized with European funding (COST Action ES0905) for the period of 2010–2014. Its extensive brainstorming suggests how the
subgrid-scale parameterization problem in atmospheric modeling, especially for convection, can be examined and developed from the point of view of a robust theoretical basis. Our main cautions are current emphasis on massive observational data analyses and process studies. The closure and the entrainment–detrainment problems are identified as the two highest priorities for convection parameterization under the mass–flux formulation. The need for
a drastic change of the current European research culture as concerns policies and funding in order not to further deplete the visions of the European researchers focusing on those basic issues is emphasized.
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Charakterisierung des Impuls- und Wärmetransports in zylindrokonischen Tanks während der Gärung, Reifung und Lagerung mittels laseroptischer und Ultraschall-MesstechnikenMeironke, Heiko January 2007 (has links)
Zugl.: Rostock, Univ., Diss., 2007
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Experimentelle und theoretische Untersuchung des Nachheizverhaltens an Kraftfahrzeugen /Weidmann, Ernst Peter, January 2008 (has links) (PDF)
Zugl.: Stuttgart, Universiẗat, Diss., 2008.
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Untersuchungen zum Stofftransport über Fluid-flüssig-Phasengrenzen in Systemen unter erhöhten DrückenDittmar, Dagmar January 2007 (has links)
Zugl.: Hamburg, Techn. Univ., Diss., 2007
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The role of eddies for the deep water formation in the Labrador SeaCzeschel, Lars. Unknown Date (has links) (PDF)
University, Diss., 2005--Kiel.
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Der Einfluß der Wärmeübertragung auf die Stabilität von StrömungenSeverin, Jan 04 May 1999 (has links) (PDF)
Am Beispiel verschiedener Strömungstypen wird die
Stabilität von Strömungen unter Einfluß eines
Temperaturfeldes untersucht. Eine reguläre Störungs-
rechnung wird durchgeführt, um die Effekte temperatur-
abhängiger Stoffwerte systematisch und allgemein-
gültig erfassen zu können. Die Ergebnisse werden in
Form asymptotischer Reihen für die kritischen Kenn-
zahlen der jeweiligen Probleme angegeben.
Sowohl die Orr-Sommerfeld-Gleichungen als auch die
PSE-Gleichungen, jeweils mit variablen Stoffwerten,
kommen bei der Untersuchung von Grenzschicht-
strömungen zum Einsatz. Von besonderem Interesse
sind hier die Unterschiede in den Lösungen beider
mathematischer Modelle bezüglich der Effekte
variabler Stoffwerte. Es zeigt sich, dass die
Differenzen in den Lösungen beider Theorien für
den Fall konstanter und für den Fall variabler
Stoffwerte gleich groß sind.
Für die Grenzschichtströmung bei natürlicher Kon-
vektion an einer beheizten vertikalen Wand werden
die vollständigen PSE-Gleichungen gelöst. Hier
zeigen sich starke Abweichungen zur lokalen paral-
lelen Theorie (Orr--Sommerfeld--Gleichungen).
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Satellite observations of convection and their implications for parameterizationsQuaas, Johannes, Stier, Philip 20 May 2016 (has links) (PDF)
Parameterization development and evaluation ideally takes a two-step approach (Lohmann et al., 2007). Insight into new processes, and initial parameterization formulation should be guided by theory, process-level observations (laboratory experiments or field studies) or, if these are unavailable, by high-resolution modelling. However, once implemented into large-scale atmospheric models, a thorough testing and evaluation is required in order to assure that the parameterization works satisfactorily for all weather situations and at the scales the model is applied to. Satellite observations are probably the most valuable source
of information for this purpose, since they offer a large range of parameters over comparatively long time series and with a very large, to global, coverage. However, satellites usually retrieve parameters in a rather indirect way, and some quantities (e.g., vertical wind velocities) are unavailable. It is thus essential for model evaluation
1. to assure comparability; and,
2. to develop and apply metrics that circumvent the limitations of satellite
observations and help to learn about parameterizations.
In terms of comparability, the implementation of so-called \"satellite simulators\" has emerged as the approach of choice, in which satellite retrievals are emulated, making use of model information about the subgrid-scale variability of clouds, and creating summary statistics (Bodas-Salcedo et al., 2011; Nam and Quaas, 2012; Nam et al., 2014). In terms of process-oriented metrics, a large range of approaches has been developed, e.g. investigating the life cycle of cirrus from convective detrainment (Gehlot and Quaas, 2012), or focusing on the details of microphysical processes (Suzuki et al., 2011). Besides such techniques
focusing on individual parameterizations, the data assimilation technique might be exploited, by objectively adjusting convection parameters and learning about parameter choices and parameterizations in this way (Schirber et al., 2013).In this chapter, we will first introduce the available satellite data, consider their limitations and the approaches to account for these, and then discuss observations-based process-oriented metrics that have been developed so far.
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