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Volume 11, issue 6 | Copyright
The Cryosphere, 11, 2595-2609, 2017
https://doi.org/10.5194/tc-11-2595-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 15 Nov 2017

Research article | 15 Nov 2017

Basin-scale heterogeneity in Antarctic precipitation and its impact on surface mass variability

Jeremy Fyke1, Jan T. M. Lenaerts2,3, and Hailong Wang4 Jeremy Fyke et al.
  • 1Los Alamos National Laboratory, Los Alamos, New Mexico, USA
  • 2Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, Colorado, USA
  • 3Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, the Netherlands
  • 4Pacific Northwest National Laboratory, Richland, Washington, USA

Abstract. Annually averaged precipitation in the form of snow, the dominant term of the Antarctic Ice Sheet surface mass balance, displays large spatial and temporal variability. Here we present an analysis of spatial patterns of regional Antarctic precipitation variability and their impact on integrated Antarctic surface mass balance variability simulated as part of a preindustrial 1800-year global, fully coupled Community Earth System Model simulation. Correlation and composite analyses based on this output allow for a robust exploration of Antarctic precipitation variability. We identify statistically significant relationships between precipitation patterns across Antarctica that are corroborated by climate reanalyses, regional modeling and ice core records. These patterns are driven by variability in large-scale atmospheric moisture transport, which itself is characterized by decadal- to centennial-scale oscillations around the long-term mean. We suggest that this heterogeneity in Antarctic precipitation variability has a dampening effect on overall Antarctic surface mass balance variability, with implications for regulation of Antarctic-sourced sea level variability, detection of an emergent anthropogenic signal in Antarctic mass trends and identification of Antarctic mass loss accelerations.

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In this CESM modeling study, we uncover regional relationships in snowfall across Antarctica that are corroborated by regional modeling and ice core records. These relationships are driven by variability in large-scale atmospheric moisture transport and dampen overall Antarctic snowfall variability, with implications for Antarctic-sourced sea level variability and detection of an emergent anthropogenic signal in Antarctic mass trends.
In this CESM modeling study, we uncover regional relationships in snowfall across Antarctica...
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