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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Making the CAWSES Virtual Institute: escience and informatics at work Fox Peter 1 , Kozyra Janet 2 1 RPI, 2 University of Michigan Based on a successful pilot study during CAWSES I that utilized cyber infrastructure to organize and conduct science, CAWSES-II under the eScience and Informatics task group has created an International Virtual Institute. This institute is organized around the principles that progress in system-level investigations requires: researchers committed to the value of pursuing science at the interface between disciplines, strongly-focused science topics that provide a common theme around which disciplines are able to interact, means of educating researchers about the key scientific issues in other disciplines and the connections between disciplines, access to scientific publications in other discipline areas, new forms of scholarly publishing, and the structure needed to bring researchers into contact with data sets, models, and each other, across disciplines and national boundaries. The presentation will introduce the concepts and capabilities of the Virtual Institute ranging from data resources via Virtual Observatories to web-based collaboration environments and indicate how CAWSES II Task groups may utlize this mechanism to further their research activities and outcomes.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Secondary instabilities in breaking inertia gravity waves Fruman Mark , Achatz Ulrich IAU - Goethe Universität-Frankfurt The breaking of inertia-gravity waves is an important process in the control of the structure and variability of the circulation in the middle atmosphere as well as contributing to the mixing of atmospheric constituents. Since inertia-gravity waves involve such a wide range of temporal and spatial scales, their effects must inevitably be parameterized in large-scale models. It is therefore critical that the conditions for breaking and the dynamics of the ensuing turbulence be well understood. In this talk, the three-dimensionalization of turbulence in the breaking of vertically propagating inertia-gravity waves is investigated using singular vector analysis, whereby the initial perturbations whose energy grows by the largest factor in a given optimization time are found. It builds on earlier work in which the development of turbulence in a breaking inertiagravity wave was investigated using a high-resolution nonlinear two-dimensional Boussinesq model initialized with a single inertia-gravity wave and one of its leading singular vectors or fastest growing normal modes. In practice, however, the flow becomes strongly threedimensional. A tangent-linear model is used to find the leading singular vectors orthogonal to the plane containing the wave vectors of the breaking wave and primary perturbation and thus shed light on the dynamics of the initial three-dimensionalization of the flow. The talk will focus on two cases: a statically stable wave perturbed by its leading singular vector and a statically unstable wave perturbed by its leading normal mode. In both cases, the secondary instabilities grow through interaction with the buoyancy gradient and velocity shear in the basic state. Which growth mechanism predominates depends on the time dependent structure of the basic state and the wavelength of the secondary perturbation. The singular vectors are compared to integrations of the tangent-linear model using random initial conditions, and the leading few singular vectors are found to be representative of the structures that emerge in the random integrations. A main result is that the length scales of the leading secondary instabilities are an order of magnitude smaller than the wavelengths of both the initial wave and primary perturbation, suggesting the essential dynamics of the breaking might be captured by tractable nonlinear three-dimensional simulations in a relatively small triply-periodic domain.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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