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|December 30, 2022
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Summary
This summary is machine-generated.

Post-depositional vapor-snow exchange significantly impacts snow isotopic composition, affecting paleoclimate reconstructions. This process introduces a warm bias in summertime ice core records, necessitating a reevaluation of past climate data.

Keywords:
EGRIPGreenland Ice Sheetice corespaleoclimate reconstructionsnow‐atmosphere exchangestable water isotopes

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Area of Science:

  • Paleoclimatology
  • Glaciology
  • Atmospheric Science

Background:

  • Ice core stable water isotopes are crucial for reconstructing past climate variability.
  • Post-depositional atmosphere-snow interactions, specifically humidity exchange, influence snow isotopic composition.
  • Current paleoclimate reconstructions often do not account for these post-depositional effects.

Purpose of the Study:

  • To quantify the influence of vapor-snow exchange on surface snow isotopic composition.
  • To assess the impact of vapor-snow exchange on paleoclimate reconstructions from ice cores.
  • To investigate the bias introduced by vapor-snow exchange in summertime ice core records.

Main Methods:

  • Analysis of concurrent vapor and surface snow isotopic composition evolution between precipitation events.
  • Utilizing observational data from the Greenland Ice Sheet.
  • Employing accompanying climate modeling to simulate vapor-snow exchange effects.

Main Results:

  • Vapor-snow exchange explains 36% of summertime day-to-day δ18O variability and 53% of δD variability in surface snow.
  • Vapor-snow exchange introduces a warm bias in summertime snow isotope values relevant for ice core analysis.
  • The impact of vapor-snow exchange on ice core signals can be variable with long-term changes in atmosphere-snow interactions.

Conclusions:

  • Post-depositional vapor-snow exchange is a significant factor influencing ice core isotope signals.
  • Existing paleoclimate reconstructions based on ice core isotopes may require revision due to this unaccounted-for process.
  • Future paleoclimate studies should incorporate vapor-snow exchange dynamics for improved accuracy.