A phase sensitive algorithm for detection of short‐lived events in stable isotope records

This study provides a first attempt at using a phase sensitive detection algorithm to detect short‐lived events, such as glacial meltwater events, in stable oxygen isotope records. Pertinent parameters such as the decay time and oscillation frequency of such rapid events are determined. A comparative study has been made from δ¹³C data and δ¹⁸O data using the phase sensitive detection technique. Common events are identified in the two types of records, with a decay time of 7±5 kyr and with an angular oscillation frequency ω_r=1.5±0.2 (ky)⁻¹ (correspondingly, a cycle frequency f_r = ω_r/2π ≈ 0.4±0.03 ky⁻¹, or a cycle time T=1/f = 2.5 kyr), likely corresponding to rapid glacial meltwater effects.