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.

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.

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....

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,...

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...

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...

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...

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).

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).

Tipping points and power cuts

18 Jun 2015 | Presentations

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

18 Jun 2015 | Presentations

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...

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...

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,...

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...

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...

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...

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.

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.  

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.