02 Sep 2022
02 Sep 2022
Status: this preprint is currently under review for the journal TC.

200-years ice core bromine reconstruction at Dome C (Antarctica): observational and modelling results

François Burgay1,2, Rafael Pedro Fernández3, Delia Segato2,4, Clara Turetta2,4, Christopher S. Blaszczak-Boxe5, Rachael H. Rhodes6, Claudio Scarchilli7, Virginia Ciardini7, Carlo Barbante2,4, Alfonso Saiz-Lopez8, and Andrea Spolaor2,4 François Burgay et al.
  • 1Paul Scherrer Institute, Laboratory of Environmental Chemistry (LUC), 5232 Villigen PSI, Switzerland
  • 2University Ca’ Foscari of Venice, Department of Environmental Sciences, Informatics and Statistics, 30172 Venice Mestre, Italy
  • 3Institute for Interdisciplinary Science, National Research Council (ICB-CONICET), FCEN-UNCuyo, Mendoza, 5501, Argentina
  • 4National Research Council, Institute of Polar Sciences, 30172 Venice Mestre, Italy
  • 5Department of Geosciences, The Pennsylvania State University, State College, PA 16803, United States
  • 6Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom
  • 7Laboratory of Observations and Measures for the Environment and Climate (SSPT-PROTER-OEM), ENEA, Rome, Italy
  • 8Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain

Abstract. Bromine enrichment (Brenr) has been proposed as an ice core proxy for past sea-ice reconstruction. Understanding the processes that influence bromine preservation in the ice is crucial to achieve a reliable interpretation of ice core signals and to potentially relate them to past sea-ice variability. Here, we present a 210-years bromine record that sheds light on the main processes controlling bromine preservation in the snow and ice at Dome C, East Antarctic plateau. Using observations alongside a modelling approach, we demonstrate that the bromine signal is preserved at Dome C, and it is not affected by the strong variations in ultraviolet radiation reaching the Antarctic plateau due to the stratospheric ozone hole. Based on this, we investigate whether the Dome C Brenr record can be used as an effective tracer of past Antarctic sea-ice. Due to the limited time window covered by satellite measurements and the low sea-ice variability observed during the last 30 years in East Antarctica, at this stage we cannot fully validate Brenr as an effective proxy for past sea-ice reconstructions at Dome C.

François Burgay et al.

Status: open (until 11 Nov 2022)

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François Burgay et al.

François Burgay et al.


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Short summary
The manuscript presents the first ice core record of Bromine in the Antarctic plateau. By the observation of the ice core and the application of atmospheric chemical models, we investigate the behaviour of bromine after its deposition into the snowpack with interest in the effect of UV radiation change connected to the formation of the ozone hole, the role of volcanic deposition and the possible use of Br to reconstruct past sea ice changes from ice core collect in the inner Antarctic plateau