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natural phenomenon > climatic phenomenon > climate anomaly > Dansgaard-Oeschger cycle
scientific discipline > stratigraphy > climatostratigraphy > climatostratigraphic period > Dansgaard-Oeschger cycle

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Dansgaard-Oeschger cycle  

Definición

  • Dansgaard–Oeschger events (often abbreviated D–O events), named after palaeoclimatologists Willi Dansgaard and Hans Oeschger, are rapid climate fluctuations that occurred 25 times during the last glacial period. Some scientists say that the events occur quasi-periodically with a recurrence time being a multiple of 1,470 years, but this is debated. The comparable climate cyclicity during the Holocene is referred to as Bond events. The best evidence for Dansgaard–Oeschger events remains in the Greenland ice cores, which only go back to the end of the last interglacial, the Eemian interglacial (about 115,000 years ago). Ice core evidence from Antarctic cores suggests that the Dansgaard–Oeschger events are related to the so-called Antarctic Isotope Maxima by means of a coupling of the climate of the two hemispheres, the Polar see-saw. If this relationship holds also for the previous glacials, Antarctic data suggest that D-O events were present in previous glacial periods as well. Unfortunately, current ice core records from Greenland extend only through the last most recent glacial period so direct evidence of D-O events in earlier glacial periods from Greenland ice is unavailable. However, work by Stephen Barker and colleagues has shown that the existing Greenland record can be reconstructed by deriving the Antarctic ice core record. This allows for the reconstruction of an older Greenland record through the derivation of the nearly million-year-long Antarctic ice core record. (Adapted from: https://en.wikipedia.org/wiki/Dansgaard%E2%80%93Oeschger_event)

Concepto genérico

Etiquetas alternativas

  • Dansgaard Oeschger cycle
  • D-O cycle

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URI

http://data.loterre.fr/ark:/67375/QX8-PMQKQ7HF-Q

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