Solar and tidal reverberations of deglaciation records from the tropical western Pacific: a clean spectral approach

Abstract

The search for the role of solar and tidal cycles in terrestrial climate records is an interesting curiosity. Powerful clean spectroscopy of high resolution carbon and oxygen isotope records from the tropical western Pacific Sulu Sea, over the past 9000-22000 years reveals statistically significant (at > 90% confidence interval) spectral lines corresponding to periods of 2980, 690, 322, 250, 174 and 140 years and 1100, 533, 425, 183 and 151 years, respectively. These spectral peaks fall into different solar-climate frequency bands and have beat relationships to each other. The results suggest intricate physical linkages between solar and climate cycles and provide significant information for understanding solar-terrestrial climate variability in the past centuries.