Now showing items 1162-1179 of 1179

  • Was the Little Ice Age more or less El Niño-like than the Medieval Climate Anomaly? Evidence from hydrological and temperature proxy data 

    Henke, LMK; Lambert, FH; Charman, DJ (European Geosciences Union (EGU) / Copernicus Publications, 2017-03-29)
    The El Niño–Southern Oscillation (ENSO) is the most important source of global climate variability on interannual timescales and has substantial environmental and socio-economic consequences. However, it is unclear how it ...
  • Wave dispersion properties of compound finite elements 

    Melvin, T; Thuburn, J (Elsevier for Academic Press, 2017-02-28)
    Mixed finite elements use different approximation spaces for different dependent variables. Certain classes of mixed finite elements, called compatible finite elements, have been shown to exhibit a number of desirable ...
  • Wavelet transform-based de-noising for two-photon imaging of synaptic Ca2+ transients. 

    Tigaret, CM; Tsaneva-Atanasova, K; Collingridge, GL; Mellor, JR (Biophysical Society, 2013-03-05)
    Postsynaptic Ca(2+) transients triggered by neurotransmission at excitatory synapses are a key signaling step for the induction of synaptic plasticity and are typically recorded in tissue slices using two-photon fluorescence ...
  • Weak chimeras in minimal networks of coupled phase oscillators 

    Ashwin, Peter; Burylko, Oleksandr (American Institute of Physics (AIP), 2015)
    We suggest a definition for a type of chimera state that appears in networks of indistinguishable phase oscillators. Defining a "weak chimera" as a type of invariant set showing partial frequency synchronization, we show ...
  • Weak convergence to extremal processes and record events for non-uniformly hyperbolic dynamical systems 

    Holland, MP; Todd, M (Cambridge University Press (CUP), 2017-09-07)
    For a measure-preserving dynamical system (X , f, µ), we consider the time series of maxima Mn = max{X1, . . . , Xn} associated to the process Xn = φ( f n−1 (x)) generated by the dynamical system for some observable φ ...
  • Weakened tropical circulation and reduced precipitation in response to geoengineering 

    Ferraro, Angus J.; Highwood, Eleanor J.; Charlton-Perez, Andrew J. (Institute of Physics, 2014)
    Geoengineering by injection of reflective aerosols into the stratosphere has been proposed as a way to counteract the warming effect of greenhouse gases by reducing the intensity of solar radiation reaching the surface. ...
  • A weibull approach for improving climate model projections of tropical cyclone wind-speed distributions 

    Tye, MR; Stephenson, DB; Holland, GJ; Katz, RW (American Meteorological Society, 2014-01-01)
    Reliable estimates of future changes in extreme weather phenomena, such as tropical cyclone maximum wind speeds, are critical for climate change impact assessments and the development of appropriate adaptation strategies. ...
  • What is the spatial distribution of magnetic helicity injected in a solar active region? 

    Pariat, E.; Nindos, A.; Démoulin, P.; Berger, M.A. (EDP Sciences, 2006)
    Context. Magnetic helicity is suspected to play a key role in solar phenomena such as flares and coronal mass ejections. Several investigations have recently computed the photospheric flux of magnetic helicity in active ...
  • White paper: Uncertainty and variability in computational and mathematical models of cardiac physiology. 

    Mirams, GR; Pathmanathan, P; Gray, RA; Challenor, P; Clayton, RH (Wiley, 2016-03-15)
    The Cardiac Physiome effort is one of the most mature and successful applications of mathematical and computational models for describing and advancing the understanding of physiology. After five decades of development, ...
  • Why RLC realizations of certain impedances need many more energy storage elements than expected 

    Hughes, TH (Institute of Electrical and Electronics Engineers (IEEE), 2017-02-09)
    It is a significant and longstanding puzzle that the resistor, inductor, capacitor (RLC) networks obtained by the established RLC realization procedures appear highly non-minimal from the perspective of linear systems ...
  • Widespread seasonal compensation effects of spring warming on northern plant productivity 

    Buermann, W; Forkel, M; O'Sullivan, M; Sitch, S; Friedlingstein, P; Haverd, V; Jain, AK; Kato, E; Kautz, M; Lienert, S; Lombardozzi, D; Nabel, JEMS; Tian, H; Wiltshire, AJ; Zhu, D; Smith, WK; Richardson, AD (Springer Nature, 2018-10-03)
    Climate change is shifting the phenological cycles of plants1, thereby altering the functioning of ecosystems, which in turn induces feedbacks to the climate system2. In northern (north of 30° N) ecosystems, warmer springs ...
  • Wind-induced odd gravitational harmonics of Jupiter 

    Kong, Dali; Zhang, Keke; Schubert, Gerald (Oxford University Press for Royal Astronomical Society, 2015)
    While the rotational distortion of Jupiter makes a major contribution to its lowermost order even zonal gravitational coefficients Jn with n ≥ 2, the component of the zonal winds with equatorial antisymmetry, if sufficiently ...
  • Within-Burst Synchrony Changes for Coupled Elliptic Bursters 

    al Azad, Abul Kalam; Ashwin, Peter (Society for Industrial and Applied Mathematics, 2010)
    We study a novel phenomenon for coupled identical bursters: synchronized bursts where there are changes of spike synchrony within each burst. The examples we study are for normal form elliptic bursters where there is a ...
  • Writhe in the Stretch-Twist-Fold Dynamo 

    Asgari-Targhi, M.; Berger, M.A. (Taylor & Francis, 2009)
    This article looks at the influence of writhe in the stretch-twist-fold dynamo. We consider a thin flux tube distorted by simple stretch, twist, and fold motions and calculate the helicity and energy spectra. The writhe ...
  • The writhe of helical structures in the solar corona 

    Torok, T.; Berger, M.A.; Kliem, B. (EDP Sciences, 2010)
    Context. Helicity is a fundamental property of magnetic fields, conserved in ideal MHD. In flux rope geometry, it consists of twist and writhe helicity. Despite the common occurrence of helical structures in the solar ...
  • X-ray quasi-periodic pulsations in solar flares as magnetohydrodynamic oscillations 

    Foullon, Claire; Verwichte, E.; Nakariakov, V.M.; Fletcher, L. (EDP Sciences, 2005)
    We report the first observation at high spatial resolution of long-period quasi-periodic pulsations (QPP) of X-ray radiation during solar flares, made possible with the Reuven Ramaty High Energy Solar Spectroscopic Imager ...
  • The XWS open access catalogue of extreme European windstorms from 1979 to 2012 

    Roberts, JF; Champion, AJ; Dawkins, LC; Hodges, KI; Shaffrey, LC; Stephenson, DB; Stringer, MA; Thornton, HE; Youngman, BD (European Geosciences Union (EGU), 2014-09-22)
    The XWS (eXtreme WindStorms) catalogue consists of storm tracks and model-generated maximum 3 s wind-gust footprints for 50 of the most extreme winter windstorms to hit Europe in the period 1979-2012. The catalogue is ...
  • Untitled 

    Quinn, C; Sieber, J; Heydt, ASVD; Lenton, TM (Oxford University Press (OUP), 2018-09-01)
    The Mid-Pleistocene Transition, the shift from 41 kyr to 100 kyr glacial-interglacial cycles that occurred roughly 1 Myr ago, is often considered as a change in internal climate dynamics. Here we revisit the model of ...