Orbital Tuning of Marine Sedimentary Cores: An Automatic Procedure Based on aGeneral Linear Model

摘要

A method to optimize the chronology of marine cores by orbital tuning ispresented. In a first step, and as an additional result, a model for the variation of the oxygen isotope abundance ratio throughout the core is calculated. The model consists of two components: one results from the convolution of the solar insolation at 65 deg on 15 Jul. with an impulse response function which is calculated from the data, the other is an additional low frequency component. The initial age depth relation of the core can be optimized by minimizing the deviation between model and data. The results of applications in the Meteor core 13519 and the Ocean Drilling Program core site 658 are shown. With the optimized chronologies the model fits the data quite well throughout the investigated cores.