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Antarctic surface temperature and elevation during the Last Glacial Maximum.

Christo Buizert1, T J Fudge2, William H G Roberts3

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|June 4, 2021
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Summary
This summary is machine-generated.

This study reveals Last Glacial Maximum cooling in Antarctica, with West Antarctica cooling 10°C and East Antarctica 4-7°C. These findings reconcile paleoclimate data with climate models.

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Area of Science:

  • Paleoclimatology
  • Glaciology
  • Antarctic Research

Background:

  • Water-stable isotopes in polar ice cores are a key temperature proxy.
  • Calibration of these proxies is challenging, especially in East Antarctica.
  • Understanding past Antarctic climate is crucial for predicting future climate change.

Purpose of the Study:

  • To reconstruct the magnitude and spatial pattern of Last Glacial Maximum surface cooling in Antarctica.
  • To compare ice core data with global climate model outputs.
  • To reconcile discrepancies between different paleoclimate proxy reconstructions.

Main Methods:

  • Analysis of borehole thermometry and firn properties from seven Antarctic ice cores.
  • Incorporation of ice core air-content data to account for topographic changes.
  • Comparison of reconstructed temperatures with water-isotope proxy data and climate model simulations.

Main Results:

  • West Antarctic sites experienced surface cooling of approximately 10°C relative to the preindustrial period.
  • East Antarctic sites showed a cooling range of approximately 4°C to 7°C.
  • Reconstructed cooling in East Antarctica aligns with climate models when topographic changes are considered, but is lower than estimates from water-isotope proxies calibrated against modern gradients.

Conclusions:

  • The study provides a refined estimate of Last Glacial Maximum cooling across Antarctica.
  • An altered Antarctic temperature inversion during the glacial period helps reconcile the new findings with water-isotope observations.
  • This research improves the reliability of paleoclimate reconstructions in Antarctica.