A stochastic nonlinear oscillator model for glacial millennial-scale climate transitions derived from ice-core data
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...
Published in: | Nonlinear Processes in Geophysics |
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Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2012
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Subjects: | |
Online Access: | https://doi.org/10.5194/npg-19-595-2012 https://noa.gwlb.de/receive/cop_mods_00023907 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023862/npg-19-595-2012.pdf https://npg.copernicus.org/articles/19/595/2012/npg-19-595-2012.pdf |
Summary: | 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. |
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