A First Step Toward Quantifying the Climate’s Information Production over the Last 68,000 Years
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Paleoclimate records are extremely rich sources of information about the past history of the Earth system. We take an information-theoretic approach to analyzing data from the WAIS Divide ice core, the longest continuous and highest-resolution water isotope record yet recovered from Antarctica. We use weighted permutation entropy to calculate the Shannon entropy rate from these isotope measurements, which are proxies for a number of different climate variables, including the temperature at the time of deposition of the corresponding layer of the core. We find that the rate of information production in these measurements reveals issues with analysis instruments, even when those issues leave no visible traces in the raw data. These entropy calculations also allow us to identify a number of intervals in the data that may be of direct relevance to paleoclimate interpretation, and to form new conjectures about what is happening in those intervals—including periods of abrupt climate change.
KeywordsInformation Production Storm Track Moisture Source Geothermal Heat Permutation Entropy
- 10.Dansgaard, W., Johnsen, S., Clausen, H., Gundestrup, N.: Stable isotope glaciology. Medelelsser om Gronland 197, 1–53 (1973)Google Scholar
- 21.WAIS Divide Project Members: Onset of deglacial warming in west antarctica driven by local orbital forcing. Nature 500, 440–444 (2013)Google Scholar
- 23.White, J., et al.: Abrupt impacts of climate change: Anticipating surprises. In: EGU General Assembly Conference Abstracts, vol. 16, p. 17028 (2014)Google Scholar