Published January 24, 2023 | Version v1
Dataset Open

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

Creators

  • 1. Paul Scherrer Institute, Laboratory of Environmental Chemistry (LUC), 5232 Villigen PSI, Switzerland
  • 2. Institute for Interdisciplinary Science, National Research Council (ICB-CONICET)
  • 3. University Ca' Foscari of Venice, Department of Environmental Sciences,
  • 4. National Research Council, Institute of Polar Sciences, 30172 Venice Mestre, Italy
  • 5. Interdisciplinary Studies Department, Howard University, 20059 Washington DC, United States
  • 6. Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom
  • 7. Laboratory of Observations And Measures for the Environment and Climate (SSPT-PROTER-OEM), ENEA, Rome, Italy
  • 8. Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain

Description

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, we cannot fully validate Brenr as an effective proxy for past sea-ice reconstructions at Dome C.

In this database, annual averaged data for Br, Na and Brenr for the shallow ice core are provided.

 

Notes

This publication was generated in the frame of Beyond EPICA. The project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement no. 815384 (Oldest Ice Core) and by the "Programma Nazionale per la Ricerca in Antartide" (PNRA, project no. PNRA16_00295). This study is also supported by the bilateral international exchange award Royal Society (UK)-CNR titled: Antarctic sea-ice history: developing robust ice core proxies (IEC/R2/202110), awarded to Rachael H. Rhodes and Andrea Spolaor.

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Additional details

Funding

Beyond EPICA – Beyond EPICA Oldest Ice Core: 1,5 Myr of greenhouse gas – climate feedbacks 815384
European Commission