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  1. 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.

  2. 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.

  3. 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....

  4. 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,...

  5. 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...

  6. 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...

  7. 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).

  8. 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).

  9. Tipping points and power cuts

    18 Jun 2015 | Presentations

  10. Who, or what, will tip the big climate models?

    18 Jun 2015 | Presentations

  11. 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...

  12. 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...

  13. 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,...

  14. 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...

  15. 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...

  16. 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...

  17. Introduction to the Mathematics of Climate at UMN - Lecture 18

    12 May 2015 | Presentations

    This is lecture 18 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.

  18. Introduction to the Mathematics of Climate at UMN - Lecture 14

    12 May 2015 | Presentations

    This is lecture 14 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.  

  19. IMA Hot Topics Workshop: Predictability in Earth System Processes

    09 May 2015 | Workshops

    A major question facing climate modeling is how best to incorporate data into models. As climate models increase in complexity, their results become correspondingly intricate. Such models represent climate processes spanning multiple spatial and temporal scales and must relate disparate physical...

  20. Realistic modeling and analysis of synchronization dynamics in power-grid networks

    08 May 2015 | Presentations

    An imperative condition for the functioning of a power-grid network is that its power generators remain synchronized. Disturbances can prompt desynchronization, which is a process that has been involved in large power outages. In this talk I will first give a comparative review of three leading...