Centre for the Mathematics of Planet Earth

LMS Undergraduate Summer Schools
2021-07-11 - 2021-07-23
2021 LMS Undergraduate Summer School
University of Swansea, 11-23 July 2021
Dr Tobias Kuna, Associate Professor, Department of Mathematics & Statistics will be one of the course lecturers at the 2021 LMS Undergraduate Summer School.
For further details please visit https://www.swansea.ac.uk/maths/seminars/lms-summer-school-2020/

Nonautonomous dynamical systems: from theory to applications
2021-07-05 10:30 - 17:30 (Europe/London)
This event will take place on 5th July 2021 at the University of Exeter (Streatham Campus) in Exeter, with further opportunities to participate in informal discussions on 6th and 7th July.
This workshop is organised by Peter Ashwin (Exeter) and Lea Oljaca (Exeter) under the EPSRC funded project “Applied Nonautonomous Dynamical Systems: Theory, Methods and Examples” and together with principal researchers Martin Rasmussen (Imperial) and Valerio Lucarini (Reading) and project partners Richard Wood (Met office), TiPES and S Wieczorek (Cork).
For further details, please click here.
Please register here by 30th June 2021. There is no registration fee.

Dynamical Landscape and Multistability of a Climate Model: Inaugural seminar, Mathematics of Planet Earth research group, Imperial College London
2021-06-08 16:00 - 17:00 (Europe/London)
Professor Valerio Lucarini (Mathematics) will deliver the inaugural online seminar of the Mathematics of Planet Earth research group in the Department of Mathematics at Imperial College London on Tuesday 8 June 2021 from 16.00 – 17.00. The seminar is titled ‘Dynamical Landscape and Multistability of a Climate Model’.
The event is free and open to all. Tickets are available on a first come first served basis from http://www.imperial.ac.uk/events/135280/inaugural-seminar/

University of Reading SIAM-IMA Student Chapter Conference 2021
2021-06-07 - 2021-06-09
Join us at the University of Reading SIAM-IMA Student Chapter Conference, Monday 7th June – Wednesday 9th June

Keynote speakers
Prof. Francoise Tisseur, University of Manchester
“What are nonlinear eigenvalue problems and how to solve them?”
Dr. Naratip Santitissadeekorn, University of Surrey
“Uncertainty quantification for time-series of count data and influence network reconstruction”
Prof. Jan Sieber, University of Exeter
“Equations describing delay effects, and their applications in climate science”

For more information please visit the SIAM-IMA Student Chapter website
To join the online conference, please sign up here

MS34 Transfer Operator Methods for Open and Nonautonomous Systems with Applications
2021-05-23 12:15 - 14:15 (Europe/London)
Nonlinear dynamical systems often exhibit essentially random temporal behavior. It then makes more sense to analyse the statistical long term properties of solution ensembles, rather than individual solutions. A powerful tool in this analysis is the transfer operator, which represents the pushforward of densities (wrt some standard volume), as the spectral properties of the transfer operator directly relate to statistical properties of the dynamics. This approach was first developed for autonomous systems on compact state spaces.
In this minisymposium, we will consider open systems (where trajectories may escape), as well as random systems (resulting in a random transfer operators). Studying the transfer operators again allows conclusions on the long term statistical properties of the dynamics. For open systems for instance one finds conditionally invariant probabilities while random transfer operators can be used to study pullback invariant measures.
S. Vaienti will give an overview over transfer operator methods in open systems, while P. Giulietti will talk about statistical extremes for open systems. The work by L. Oljaca uses (Hilbert) projective metrics on cones to analyse random transfer operators which arise in nonlinear filtering (motivated by Data Assimilation techniques in Weather, Climate, and Oceans). K. Padberg-Gehle will present an application to coherent structures in fluid flows.
Organizer: Jochen Broecker, University of Reading, United Kingdom
Tobias Kuna, University of Reading, United Kingdom

12:15-12:40 Thermodynamic Formalism for Random Covering Systems abstract
Sandro Vaienti, Aix-Marseille University and Universite de Toulon, France; Jason Atnip and Gary Froyland, University of New South Wales, Australia; Cecilia Gonzalez-Tokman, University of Queensland, Australia

12:45-1:10 Extreme Value Theory via Transfer Operators abstract
Paolo Giulietti, Università di Pisa, Italy

1:15-1:40 Stability of the Nonlinear Filter for Anosov Diffeomorphisms abstract
Lea Oljaca, University of Exeter, United Kingdom; Jochen Broecker and Tobias Kuna, University of Reading, United Kingdom

1:45-2:10 Applications of Transfer Operator Methods in Fluid Dynamics abstract
Kathrin Padberg-Gehle, Leuphana University Lueneburg, Germany

For more information please visit the event page.
This minsymposium is part of the SIAM Conference on Applications of Dynamical Systems (DS21), May 23 – 27, 2021, Virtual Conference.

Dynamical Landscape and Multistability of the Earth's Climate
2021-02-12 20:30 (Europe/London) | Online
Professor Valerio Lucarini presents ‘Dynamical Landscape and Multistability of the Earth’s Climate’ as part of the McGill Physical Society Colloquium on 12 Feb 2021, 3.30pm EST / 8.30pm GMT.
https://www.physics.mcgill.ca/seminars/PSC_lucarini.html

Heat Waves and Cold Spells and Their Response to Climate Change
2021-02-10 10:00 (Europe/London)
Professor Valerio Lucarini will be presenting ‘Heat Waves and Cold Spells and Their Response to Climate Change’ at the University of Heidelberg on Wednesday, Feb 10 2021 at 11am CET / 10am GMT.
https://zoom.us/j/98830108179
Meeting ID: 988 3010 8179
Passcode: [REDACTED]

Post-grazing dynamics of a vibro-impacting energy generator
2021-02-09 13:15 (Europe/London)
Larissa Serdukova, PDRA in Mathematics of Planet Earth – Project TiPES, will be presenting ‘Post-grazing dynamics of a vibro-impacting energy generator’ as part of the University of Bath’s AIMS seminar series on Tuesday 9th February at 1.15pm.
Zoom Meeting
https://bath-ac-uk.zoom.us/j/98901674720?pwd=[REDACTED]
Meeting ID: 989 0167 4720
Passcode: [REDACTED]
The motion of a forced vibro-impacting inclined energy harvester is investigated in parameter regimes with asymmetry in the number of impacts on the bottom and top of the device. This motion occurs beyond a grazing bifurcation, at which alternating top and bottom impacts are supplemented by a zero velocity impact with the bottom of the device. For periodic forcing, we obtain semi-analytical expressions for the asymmetric periodic motion with a ratio of 2:1 for the impacts on the device bottom and top, respectively. These expressions are derived via a set of nonlinear maps between different pairs of impacts, combined with impact conditions that provide jump discontinuities in the velocity. Bifurcation diagrams for the analytical solutions are complemented by a linear stability analysis around the 2:1 asymmetric periodic solutions and are validated numerically. For smaller incline angles, a second grazing bifurcation is numerically detected, leading to a 3:1 asymmetry. For larger incline angles, period doubling bifurcations precede grazing bifurcations. The converted electrical energy per impact is reduced for the asymmetric motions, and therefore less desirable under this metric.

Conference: Linear Response: Rigorous Results and Applications
2021-01-25 - 2021-01-29 | Online
Conference: Linear Response: Rigorous Results and Applications
25 – 29 January 2021
Bernoulli Center, EPFL, Lausanne (online)
Transfer operators have been used to study rare and extreme events in dynamical systems and the linear – or nonlinear – response of systems to perturbations, including applications to climate dynamics. This conference brings together experts from both theoretical and applied aspects of these studies, also in the presence of singularities.
Click here to register online https://bernoulli.epfl.ch/events/1507
Professor Valerio Lucarini, Director of the Centre for the Mathematics of Planet Earth (CMPE), will be one of the speakers.

Workgroup on Climate-Statistical Mechanics - LSCE/SPEC
2021-01-11 13:00 (Europe/London)
Workgroup on Climate-Statistical Mechanics – LSCE/SPEC
Monday Jan 11th 2021, 13.00 London Time/14.00 Paris time, Seminar
Valerio Lucarini (University of Reading)
“Fingerprinting Heatwaves and Cold Spells and Assessing Their Response to Climate Change using Large Deviation Theory”
Extreme events provide relevant insights on the dynamics of the climate system and their understanding is key to defining useful strategies for mitigating the impact of climate variability and climate change. By applying large deviation theory to the output of a state-of-the-art climate model, we define the climatology of persistent heatwaves and cold spells in some key target regions of the planet by constructing empirically the corresponding rate functions for the surface temperature, and we assess the impact of increasing CO2 concentration on such persistent anomalies. In particular, we can better understand the increasing hazard associated to heatwaves in a warmer climate. We show that two 2010 high impact events – summer Russian heatwave and winter Dzud in Mongolia – are associated with atmospheric patterns that are exceptional compared to the typical ones, but typical compared to the climatology of extreme events. Finally, we propose an approximate formula for describing large and persistent temperature fluctuations from easily accessible statistical properties.
M. Galfi and V. Lucarini, Fingerprinting Heatwaves and Cold Spells and Assessing Their Response to Climate Change using Large Deviation Theory, arXiv:2010.08272 (2020) [submitted to Physical Review Letters]
V. M. Galfi, V. Lucarini, and J. Wouters, A large deviation theory-based analysis of heat waves and cold spells in a simplified model of the general circulation of the atmosphere, J. Stat. Mech. 033404 (2019)
Link: https://global.gotomeeting.com/join/991371277

SIAM MPE 2020 Conference - Minisymposium MS 29
2020-08-04 13:00 - 16:00 (America/New_York)
Minisymposium MS 29 Climate Variability and Climate Change: A Mathematical Perspective

August 4th 2020
3 AM – 6 AM Sidney Time
10 AM – 1 PM Los Angeles Time
1 PM – 4 PM New York Time
6 PM – 9 PM London Time
7 PM – 10 PM Paris Time

Programme:

https://meetings.siam.org/sess/dsp_programsess.cfm?SESSIONCODE=68493

Zoom session:

https://zoom.us/j/2904065818?pwd=[REDACTED]

MS 29 Climate Variability and Climate Change: A Mathematical Perspective - SIAM MPE2020
2020-08-04
Minisymposium at SIAM MPE2020 Conference

MS 29 Climate Variability and Climate Change: A Mathematical Perspective

August 4th 2020
3 AM – 6 AM Sidney Time
10 AM – 1 PM Los Angeles Time
1 PM – 4 PM New York Time
6 PM – 9 PM London Time
7 PM – 10 PM Paris Time

Programme:
https://meetings.siam.org/sess/dsp_programsess.cfm?SESSIONCODE=68493

Zoom session:
https://zoom.us/j/2904065818?pwd=[REDACTED]

Workshop on Critical Transitions in Complex Systems 2020 (online)
2020-07-29 - 2020-07-31
Workshop on Critical Transitions in Complex Systems 2020 (online), 29th – 31st July 2020
Complex systems research has been at the forefront of scientific priorities for some time and many very interesting phenomena have been identified and explored in the context of a wide variety of applications. This workshop is part of a series, reflecting on an emerging movement to develop a mathematical theory for sudden changes in the dynamical behaviour of complex systems, so-called critical transitions. The prospect to develop reliable early-warning signals for such critical transitions is potentially far-reaching since these could lead to better control strategies to avoid or diminish the effect of catastrophes.
Confirmed speakers include:
Thomas Bury (McGill University, Canada)
Kwang-Hyun Cho (Korea Advanced Institute of Science and Technology, South Korea)
Mark Dekker (University of Utrecht, The Netherlands)
Deniz Eroglu (Kadir Has University, Turkey)
Peter Ditlevsen (Niels Bohr Institute, Denmark)
Marino Gavidia (University of Luxembourg, Luxembourg)
Federico Graceffa (Imperial College London, UK)
Yoshito Hirata (University of Tsukuba, Japan)
Francoise Kemp (University of Luxembourg, Luxembourg)
Christian Kuehn (TU Munich, Germany)
Juergen Kurths (Potsdam Institute for Climate Impact Research and Humboldt University Berlin, Germany)
Valdimir Levin (University of Luxembourg, Luxembourg)
Tiejun Li (Peking University, China)
Wei Lin (Fudan University, China)
Rui Liu (South China University of Technology, China)
Iacopo Longo (TU Munich, Germany)
Valerio Lucarini (University of Reading, UK)
Stefano Magni (University of Luxembourg, Luxembourg)
Tadayoshi Matsumori (Toyota, Japan)
Guillermo Olicon-Mendez (Imperial College London, UK)
Julian Newman (University of Exeter, UK)
Makito Oku (University of Toyama, Japan)
Greg Pavliotis (Imperial College London, UK)
Tiago Pereira (University of Sao Paulo, Brazil)
Daniele Proverbio (University of Luxembourg, Luxembourg)
Martin Rasmussen (Imperial College London, UK)
Courtney Quinn (CSIRO, Hobart, Australia)
Flavia Remo (University of Jena, Germany)
Yuzuru Sato (Hokkaido University, Japan)
Marten Scheffer (Wageningen University, Netherlands)
Didier Sornette (ETH Zurich, Switzerland )
For further information and provisional schedule for the online workshop, please visit https://bit.ly/workshopcriticaltransitions2020. Registration is compulsory and can be done on the workshop webpage. (For those who do not have access to google sites, please use the alternative webpage https://bit.ly/criticaltransitions2020)

Organizing committee:
Kazuyuki Aihara, Luonan Chen, Jeroen Lamb, Wei Hao Tey

Mathematics of Planet Earth Webinars: Analysis and Modelling
2020-07-24 14:00 - 16:00 (Europe/London)
Weekly webinars organised by early career scientists. Speakers: D. Holm and V. Lucarini

Mathematics of Planet Earth Webinars: Analysis and Modelling
2020-07-17 14:30 - 16:00 (Europe/London)
Weekly webinars organised by early career scientists. Speakers: L. Kosloff and C. Ricci
