Journal cover Journal topic
Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.129 IF 1.129
  • IF 5-year value: 1.519 IF 5-year 1.519
  • CiteScore value: 1.54 CiteScore 1.54
  • SNIP value: 0.798 SNIP 0.798
  • SJR value: 0.610 SJR 0.610
  • IPP value: 1.41 IPP 1.41
  • h5-index value: 21 h5-index 21
  • Scimago H index value: 48 Scimago H index 48
Volume 19, issue 6
Nonlin. Processes Geophys., 19, 595-603, 2012
https://doi.org/10.5194/npg-19-595-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Recent advances in data analysis and modeling of nonlinear...

Nonlin. Processes Geophys., 19, 595-603, 2012
https://doi.org/10.5194/npg-19-595-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 07 Nov 2012

Research article | 07 Nov 2012

A stochastic nonlinear oscillator model for glacial millennial-scale climate transitions derived from ice-core data

F. Kwasniok1 and G. Lohmann2 F. Kwasniok and G. Lohmann
  • 1College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, UK
  • 2Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany

Abstract. A stochastic Duffing-type oscillator model, i.e noise-driven motion with inertia in a potential landscape, is considered for glacial millennial-scale climate transitions. The potential and noise parameters are estimated from a Greenland ice-core record using a nonlinear Kalman filter. For the period from 60 to 20 ky before present, a bistable potential with a deep well corresponding to a cold stadial state and a shallow well corresponding to a warm interstadial state is found. The system is in the strongly dissipative regime and can be very well approximated by an effective one-dimensional Langevin equation.

Publications Copernicus
Special issue
Download
Citation
Share