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Data concerning statistical relation between obliquity and Dansgaard-Oeschger events.

Jia Deng1,2,3, Zhaohua Wu1,2,4, Min Zhang1,2,3

  • 1First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, PR China.

Data in Brief
|August 3, 2019
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Summary

Dansgaard-Oeschger (DO) events show higher Shannon entropy (SE) during obliquity

Keywords:
Dansgaard–Oeschger eventsObliquitySurrogate dataTime-varying Shannon entropy

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Area of Science:

  • Paleoclimatology
  • Time Series Analysis
  • Information Theory

Background:

  • Dansgaard-Oeschger (DO) events are significant climate fluctuations during glacial periods.
  • Previous research suggests a link between DO events and Earth's orbital parameters, specifically obliquity.
  • Quantifying the modulation of DO events by obliquity requires advanced analytical techniques.

Purpose of the Study:

  • To investigate the relationship between obliquity phases and the characteristics of Dansgaard-Oeschger events.
  • To quantify the number of significant high Shannon entropy (SE) DO events during increasing and decreasing obliquity.
  • To determine if obliquity influences the complexity or information content of DO events.

Main Methods:

  • Ensemble Empirical Mode Decomposition (EEMD) was used to filter proxy time series and identify DO events.
  • Time-varying Shannon entropy (SE) was calculated for DO events using histogram principles.
  • A 95% significance level for SE was established using surrogate data analysis.

Main Results:

  • More significant high Shannon entropy (SE) Dansgaard-Oeschger events were found during the decreasing phase of obliquity.
  • The analysis revealed a statistically significant difference in SE values between increasing and decreasing obliquity phases.
  • The findings support the modulation of DO event characteristics by Earth's obliquity cycles.

Conclusions:

  • Earth's obliquity plays a role in modulating the complexity and information content of Dansgaard-Oeschger events.
  • The decreasing phase of obliquity is associated with a higher occurrence of significant high SE DO events.
  • This study provides quantitative evidence for the influence of orbital forcing on abrupt climate change.