Supplementary information
From the following article:
Possible solar origin of the 1,470-year glacial climate cycle demonstrated in a coupled model
Holger Braun, Marcus Christl, Stefan Rahmstorf, Andrey Ganopolski, Augusto Mangini, Claudia Kubatzki, Kurt Roth & Bernd Kromer
Nature 438, 208-211(10 November 2005)
doi:10.1038/nature04121
Supplementary Discussion 1
This discusses the stability of the simulated 1,470-year climate cycle. We consider changes in the forcing parameters, we incorporate noise in the freshwater forcing, and we discuss the robustness of the model response when a more realistic forcing is used with spectral properties close to that observed in solar proxies.
Supplementary Discussion 2
In this section, we illustrate the dynamics of the simulated DO events. This is done by comparing the response of the climate system model CLIMBER-2 with that of a very simple conceptual model which only accounts for two features of the THC, the large characteristic timescale and the high degree of non-linearity
Supplementary Figure 1
This figure shows the stability of the simulated 1,470-year climate cycle with respect to changes of the forcing frequencies of the two sinusoidal freshwater components. Each of the two forcing periods is varied over decades while the second cycle is at a fixed period.
Supplementary Figure 2
This figure shows the stability of the simulated 1,470-year climate cycle with respect to changes of the forcing frequencies of the two sinusoidal freshwater components. Both forcing periods are varied simultaneously such that the ratio of the two forcing frequencies is nearly fixed.
Supplementary Figure 3
This figure shows the stability of the simulated 1,470-year climate cycle with respect to variations of the forcing amplitudes of the two sinusoidal freshwater components. Both forcing amplitudes are varied simultaneously while their sum is fixed.
Supplementary Figure 4
This figure shows the stability of the simulated 1,470-year climate cycle with respect to additional noise in the freshwater fluxes. By varying the noise level and the forcing amplitudes, three different values are prescribed for the signal-to-noise ratio.
Supplementary Figure 5
additional noise in the freshwater fluxes. For a fixed noise level, the amplitude of each single forcing cycle is varied while the amplitude of the second cycle is fixed.
Supplementary Figure 6
This figure illustrates the basic idea of the simple conceptual model that we apply to clarify the dynamics of the DO events simulated by the climate system model CLIMBER-2.
Supplementary Figure 7
This figure shows the response of the conceptual model to the applied forcing for different amplitudes of the two sinusoidal freshwater cycles.
Supplementary Figure 8
This figure shows the stability of the simulated 1,470-year climate cycle with respect to changes of the forcing frequencies of the two sinusoidal freshwater components. In both the conceptual model and the climate system model CLIMBER-2, the two forcing periods are varied simultaneously such that the ratio of the two forcing frequencies is nearly fixed.
DOWNLOAD BROWSER PLUGINS AND OTHER APPLICATIONS
Movie files
PDF douments
Text documents
PostScript documents
Flash movies
Audio files
- Apple iTunes (PC or Mac)
- QuickTime Player (PC or Mac)
- Realplayer (PC or Mac)
- Windows Media player (PC only)
