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Hybrid EnKF and Particle Filter: Langrangian DA and Parameter Estimation
02 Jun 2016
This is a talk delivered at the Imperial College meeting on Stochastic Modeling in GFD, Data Assimilation and Non-equilibrium Phenomena on 11-4-2015. This talk presents joint research by Chris Jones at UNC-CH and Naratip Santitissandeekorn on hybrid data assimilation methods.
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A Tutorial on Kalman Filters
01 Jun 2016
This is an introduction to the Kalman filter, explaining some underlying assumptions, use and extensions of the method.This talk was given on 10-7-2015.
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Vegetation patterns in mathematical models, and vegetation patterns in Horn of Africa
21 Apr 2016 | Presentations
Visually striking large-scale spatial patterns of vegetation have been observed in semi-arid regions in the Americas, Africa and Australia. These have led to suggestions by theoretical ecologists that certain characteristics of the patterns may serve as early-warning signs of desertification....
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Data assimilation for extreme ionospheric events: observing system experiments of the September 26, 2011 geomagnetic storm
14 Apr 2016 | Presentations
As increasingly sophisticated ground- and space-based technological systems that depend on the near-Earth space environment are being built, vulnerabilities to variations in the ionosphere are also increasing. These vulnerabilities are especially prominent during extreme space-weather events,...
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New averaging results motivated by climate models: fat tails, oscillations, and tipping
10 Dec 2015 | Presentations
We review recent results where new averaging approaches are developed and applied in the context of systems with multiple time scales and fat tails and in non-autonomous multiple scale systems with oscillatory forcing. These types of systems appear in a variety of higher dimensional...
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Hybrid EnKF and Particle Filter: Lagrangian DA and Parameter Estimation
06 Nov 2015 | Presentations
Dealing with high dimensional systems is one of the central problems of data assimilation. A strategy is proposed here for systems that enjoys a skew-product structure. Christopher Jones, University of North Carolina at Chapel Hill, presents joint work with Naratip...
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Mathematics and Climate Research Network - An Example of a Successful Community-Building Effort
19 Oct 2015 | Presentations | Contributor(s): Colin James Grudzien
Slides Hans Kaper prepared for a talk on October 1, 2015, titled "The Mathematics and Climate Research Network (MCRN) - An Example of a Successful Community-Building Effort." It was part of the MPE 2013+ Workshop on Education for the Planet Earth of Tomorrow, September...
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OptIC project: An intercomparison of optimization techniques for parameter estimation in terrestrial biogeochemical models
20 Sep 2015 | Educational Materials
A comparison of different optimization techniques for parameter estimation for a very simple ecosystem model (2 ODEs).
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The REFLEX project: Comparing different algorithms and implementations for the inversion of a terrestrial ecosystem model against eddy covariance data
20 Sep 2015 | Educational Materials
A comparison of parameter estimation techniques for a simplified ecosystem model. A follow-on to the OpTIC study with a more complex model (DALEC).
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Tipping points and power cuts
18 Jun 2015 | Presentations
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Who, or what, will tip the big climate models?
18 Jun 2015 | Presentations
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ICMS Tipping Points: Fundamentals and Applications
13 Jun 2015 | Workshops
Objectives: This workshop (September, 2013) brings together mathematicians and statisticians, whose research expertise is relevant to investigating threshold behaviour in complex environmental systems, with the climate scientists and ecologists who exploit mathematical modelling in their research...
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Midwest Mathematics and Climate Conference - Day 2 Afternoon Session
12 May 2015 | Presentations
Charles Jackson, University of Texas, AustinDual-state Behavior of the Community Climate System ModelIce age climate between 80,000 and 11,000 years ago experienced abrupt (< 10 year) global-scale climate transitions every few thousand years. Evidence and theory suggests such behavior may be...
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Midwest Mathematics and Climate Conference - Day 2 Morning Session
12 May 2015 | Presentations
Juan Restrepo, Oregon State UniversityData AssimilationAccounting for uncertainties has led us to alter our expectations of what is predictable and how such predictions compare to nature. A significant effort, in recent years, has been placed on creating new uncertainty quantification techniques,...
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Midwest Mathematics and Climate Conference
12 May 2015 | Workshops
The conference is sponsored by the National Science Foundation, Institute of Mathematics and Its Applications, the Office of Research,College of Liberal Arts and Sciences, and the Department of Mathematics, Department of Geography/Atmospheric Science Program, and The...
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Midwest Mathematics and Climate Conference
12 May 2015 | Workshops
The conference is sponsored by the National Science Foundation, Institute of Mathematics and Its Applications, the Office of Research,College of Liberal Arts and Sciences, and the Department of Mathematics, Department of Geography/Atmospheric Science Program, and The...
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Midwest Mathematics and Climate Conference - Day 1 Afternoon Session
12 May 2015 | Presentations
Graham Feingold, National Oceanic & Atmospheric AdministratonDynamical System Analogues to Cloud SystemsShallow convection exhibits fascinating cellular structures at scales of a few to several hundred kilometers. Configurations of relatively cloud free open cell states, or much cloudier...
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Introduction to the Mathematics of Climate at UMN - Lecture 23
12 May 2015 | Presentations | Contributor(s): Colin James Grudzien
This is lecture 23 in the series "Introduction to the Mathematics of Climate" offered at the University of Minnesota in 2014 with the support of MCRN and The Institute for Mathematics and its Applications.
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Introduction to the Mathematics of Climate at UMN - Lecture 22
12 May 2015 | Presentations | Contributor(s): Colin James Grudzien
This is lecture 22 in the series "Introduction to the Mathematics of Climate" offered at the University of Minnesota in 2014 with the support of MCRN and The Institute for Mathematics and its Applications.
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Introduction to the Mathematics of Climate at UMN - Lecture 21
12 May 2015 | Presentations | Contributor(s): Colin James Grudzien
This is lecture 21 in the series "Introduction to the Mathematics of Climate" offered at the University of Minnesota in 2014 with the support of MCRN and The Institute for Mathematics and its Applications.