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
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