Now showing items 84-103 of 699

  • Chaos in symmetric phase oscillator networks 

    Bick, Christian; Timme, Marc; Paulikat, Danilo; Rathlev, Dirk; Ashwin, Peter (American Physical Society, 2011)
    Phase-coupled oscillators serve as paradigmatic models of networks of weakly interacting oscillatory units in physics and biology. The order parameter which quantifies synchronization so far has been found to be chaotic ...
  • Chaotic Weak Chimeras and their Persistence in Coupled Populations of Phase Oscillators 

    Bick, Christian; Ashwin, Peter (arXiv.org, 2015-09-29)
    Nontrivial collective behavior may emerge from the interactive dynamics of many oscillatory units. Chimera states are chaotic patterns of spatially localized coherent and incoherent oscillations. The recently-introduced ...
  • Characteristic matrices for linear periodic delay differential equations 

    Sieber, J.; Szalai, R. (2011)
    Szalai, Stépán, and Hogan [SIAM J. Sci. Comput., 28 (2006), pp. 1301–1317] gave a general construction for characteristic matrices for systems of linear delay differential equations with periodic coefficients. First, we ...
  • Chimera states in networks of phase oscillators: the case of two small populations 

    Panaggio, Mark J.; Abrams, Daniel M.; Ashwin, Peter; Laing, Carlo R. (Arxiv.org, 2015-08-12)
    Chimera states are dynamical patterns in networks of coupled oscillators in which regions of synchronous and asynchronous oscillation coexist. Although these states are typically observed in large ensembles of oscillators ...
  • Chloroplasts play a central role in plant defence and are targeted by pathogen effectors 

    de Torres, M; Littlejohn, George; Jayaraman, S; Studholme, David J.; Bailey, Trevor C.; Lawson, T; Delfino, L; Licht, D; Truman, W; Bölter, B; Mansfield, J; Tillich, M; Smirnoff, Nicholas; Grant, Murray (Nature Publishing Group, 2015-06-01)
    Microbe associated molecular pattern (MAMP) receptors in plants recognize MAMPs and activate basal defences; however a complete understanding of the molecular and physiological mechanisms conferring immunity remains elusive. ...
  • Classification of robust heteroclinic cycles for vector fields in R3 with symmetry 

    Hawker, David; Ashwin, Peter (Institute of Physics, 2005)
    We consider a classification of robust heteroclinic cycles in the positive octant of R3 under the action of the symmetry group (Z2)3. We introduce a coding system to represent different classes up to a topological equivalence, ...
  • Classification of wave regimes in excitable systems with linear cross diffusion 

    Tsyganov, M. A.; Biktashev, V. N. (American Physical Society, 2014)
    We consider principal properties of various wave regimes in two selected excitable systems with linear cross diffusion in one spatial dimension observed at different parameter values. This includes fixed-shape propagating ...
  • Climate impacts of geoengineering marine stratocumulus clouds 

    Jones, Andy; Haywood, James M.; Boucher, Olivier (American Geophysical Union (AGU), 2009)
    [1] Theoretical potential geoengineering solutions to the global warming problem have recently been proposed. Here, we present an idealized study of the climate response to deliberately seeding large-scale stratocumulus ...
  • Climate impacts of the southern annular mode simulated by the CMIP3 models 

    Karpechko, Alexey Yu; Gillett, Nathan P.; Marshall, Gareth J.; Screen, James A. (American Meteorological Society, 2009)
    The southern annular mode (SAM) has a well-established impact on climate in the Southern Hemisphere. The strongest response in surface air temperature (SAT) is observed in the Antarctic, but the SAM’s area of influence ...
  • Climate model response from the Geoengineering Model Intercomparison Project (GeoMIP) 

    Kravitz, B; Caldeira, K; Boucher, O; Robock, A; Rasch, PJ; Alterskjær, K; Karam, DB; Cole, JNS; Curry, CL; Haywood, JM; Irvine, PJ; Ji, D; Jones, A; Kristjánsson, JE; Lunt, DJ; Moore, JC; Niemeier, U; Schmidt, H; Schulz, M; Singh, B; Tilmes, S; Watanabe, S; Yang, S; Yoon, JH (American Geophysical Union, 2013-08-09)
    Solar geoengineering - deliberate reduction in the amount of solar radiation retained by the Earth - has been proposed as a means of counteracting some of the climatic effects of anthropogenic greenhouse gas emissions. We ...
  • Climate predictions: the influence of nonlinearity and randomness 

    Thompson, J.M.; Sieber, J. (Royal Society, 2012)
    The current threat of global warming and the public demand for confident projections of climate change pose the ultimate challenge to science: predicting the future behaviour of a system of such overwhelming complexity as ...
  • Climate tipping as a noisy bifurcation: a predictive technique 

    Thompson, J.M.; Sieber, J. (Oxford University Press for Institute of Mathematics and its Applications, 2011)
    It is often known, from modelling studies, that a certain mode of climate tipping (of the oceanic thermohaline circulation, for example) is governed by an underlying fold bifurcation. For such a case, we present a scheme ...
  • Climate-Ozone Connections 

    Baldwin, M; Dameris, M (World Meteorological Organization, 2006)
  • Climate–carbon cycle feedback analysis: results from the C4MIP model intercomparison 

    Friedlingstein, P; Cox, Peter M.; Betts, R. A.; Bopp, L.; Von Bloh, W.; Brovkin, Victor; Cadule, P.; Doney, S.; Eby, M.; Fung, I.; Bala, G.; John, J.; Jones, Chris D.; Joos, F.; Kato, T.; Kawamiya, M.; Knorr, W.; Lindsay, K.; Matthews, H. D.; Raddatz, T.; Rayner, P.; Reick, C.; Roeckner, E.; Schnitzler, K.-G.; Schnur, R.; Strassmann, K.; Weaver, A. J.; Yoshikawa, C.; Zeng, N. (American Meteorological Society, 2006)
    Eleven coupled climate-carbon cycle models used a common protocol to study the coupling between climate change and the carbon cycle. The models were forced by historical emissions and the Intergovernmental Panel on Climate ...
  • Climatic impacts of land-use change due to crop yield increases and a universal carbon tax from a scenario model 

    Davies-Barnard, Taraka; Valdes, P.J.; Singarayer, J.S.; Jones, Chris D. (American Meteorological Society, 2014-02)
    Future land cover will have a significant impact on climate and is strongly influenced by the extent of agricultural land use. Differing assumptions of crop yield increase and carbon pricing mitigation strategies affect ...
  • Climatic impacts of stratospheric geoengineering with sulfate, black carbon and titania injection 

    Jones, AC; Haywood, James M.; Jones, A (European Geosciences Union (EGU) / Copernicus Publications, 2015-11-03)
    In this paper, we examine the potential climatic effects of geoengineering by sulfate, black carbon and titania injection against a baseline RCP8.5 scenario. We use the HadGEM2-CCS model to simulate scenarios in which the ...
  • Cluster observations of the mid-altitude cusp under strong northward Interplanetary magnetic field 

    Hu, Renyu; Bogdanova, Yulia V.; Owen, Christopher J.; Foullon, Claire; Fazakerley, Andrew; Reme, Henri (American Geophysical Union (AGU), 2008)
    We report on a multispacecraft cusp observation lasting more than 100 min. We determine the cusp boundary motion and reveal the effect on the cusp size of the interplanetary magnetic field (IMF) changing from southward to ...
  • Collective learning and optimal consensus decisions in social animal groups. 

    Kao, AB; Miller, N; Torney, C; Hartnett, A; Couzin, ID (Public Library of Science, 2014-08-07)
    Learning has been studied extensively in the context of isolated individuals. However, many organisms are social and consequently make decisions both individually and as part of a collective. Reaching consensus necessarily ...
  • Comparing the degree of land–atmosphere interaction in four atmospheric general circulation models 

    Koster, Randal D.; Dirmeyer, Paul A.; Hahmann, Andrea N.; Ijpelaar, Ruben; Tyahla, Lori; Cox, Peter M.; Suarez, Max J. (American Meteorological Society, 2002)
    The strength of the coupling between the land and the atmosphere, which controls, for example, the degree to which precipitation-induced soil moisture anomalies affect the overlying atmosphere and thereby the subsequent ...
  • Comparing the effects of calibration and climate errors on a statistical crop model and a process-based crop model 

    Watson, J; Challinor, AJ; Fricker, Thomas E.; Ferro, Christopher A.T. (Springer Verlag (Germany), 2014-10-15)
    Understanding the relationship between climate and crop productivity is a key component of projections of future food production, and hence assessments of food security. Climate models and crop yield datasets have errors, ...