Phase Stability of the Solar Schwabe Cycle in Lake Holzmaar, Germany, and GISP2, Greenland, between 10,000 and 9,000 cal. BP

Summary

Changes of solar activity — e.g. the solar Schwabe cycle — are frequently documented in those archives comprising the output of biological systems The signal transfer from the solar input signal to the biological output signal is supposed to be nonlinear with an output maximum for optimal conditions of the system. Under the assumption of long-term phase stability of the solar Schwabe cycle, phase analysis should enable the detection of phase jumps when optimal conditions are crossed during the secular development of the biological system. The current study compares two archives (sediment accumulation rate of Lake Holzmaar and MSA accumulation rate in the Greenland ice core of GISP2) which are controlled by biological systems and influenced by the changes of climate in the surroundings of the Northern Atlantic. The same pattern of phase jumps of the solar Schwabe cycle is found in both archives and might permit high precision cross-dating of the archives.