Seminars of the Focus Area Complex Systems

Prof. Dr. C. Beta, Prof. Dr. K. Dethloff, Prof. Dr. R. Engbert, Prof. Dr. M. Holschneider, Prof. Dr. W. Huisinga, Prof. Dr. Ralf Metzler, Prof. Dr. A. Pikovsky, Prof. Dr. S. Reich, Prof. Dr. M. Rosenblum, Prof. Dr. G. Rüdiger, Prof. Dr. T. Scheffer, Prof. Dr. F. Scherbaum, Prof. Dr. J. Selbig, Prof. Dr. F. Spahn

Seminar

Speaker: Juan Restrepo , Oregon State University, USA

Title: Improving Data Assimilation by Surfing the Waves * SFB 1294 seminar

Time: Fri, Sep 15, 2017, 10:15am

Place: bldg 28, room 2.123

Abstract:
he use of models and data, via data assimilation, is one ofthe strategies pursued to improve climate and weather predictions and retrodictions. In these application areas the norm is that thenumber of degrees of freedom in the models is vastly larger than the data available. This is notoriously problematic in the oceans where data gathering is challenging and the dynamics have statio-temporal scales that span large ranges. The Dynamic Likelihood filter is a data assimilation scheme that isdesigned specifically for hyperbolic and advection-dominated problems. It aims to improve predictions that combine data and model outcomes in a Bayesian framework by extending the application of the likelihood over longer spatio-temporal filtering frames. When the data has low uncertainty and the data is sparse, the methodology is competitive with other filtering methodswith regard to computational complexity, and superior in its estimates.

The talk will describe the filter and show how it performs on simple wave problems. It will then be compared to other methods on problems where it is clear what the optimal outcome should be, demonstrating its efficiency and efficacy.

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Past NLD Seminars (1994-2007) & (2008 ...)

Students' seminar: Theoretical Physics, PIK, Modeling & TSA Berlin-Potsdam-Colloquia: PhysGesellschaft Berlin, TU Berlin, Pro Physik, AIP, AEI, MPI-KGF, GFZ, HMI, PIK, AWI, Max Planck Institute for the History of Science, Mathematik, DPG Disputationen, & Vorschau UP

Udo Schwarz, Zentrum für Dynamik komplexer Systeme,
Universität Potsdam, Campus Golm Karl-Liebknecht-Str. 24, 14476 Potsdam, building 28, room 2.107
Phone: (+49-331) 977-1658, Fax : (+49-331) 977-1045

Email: Udo.Schwarz AT uni-potsdam.de

DFG SFB 1294

DFG Sonderforschungsbereich 1294 Data assimilation

DFG SPP 1488

DFG Schwerpunktprogramm 1488 Planetmag


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