Bromine Enrichment Signal in Svalbard Shallow Cores Reflects Changes of Seasonal Sea Ice Variability

Abstract Bromine enrichment has been widely used as a proxy for past sea ice reconstructions. In this study, three firn cores drilled on Holtedahlfonna (Svalbard) were analyzed for trace elements. Excluding a single year data, a positive correlation was observed between and springtime sea ice variability in the potential source region during 2005–2016. Accounting for different sea ice ages, signal resulted significantly correlated only with first‐year sea ice, reinforcing its role as a major contributor to springtime gas‐phase bromine emissions. Comparisons between Na and Br concentrations in shallow cores and temporally corresponding values in annual snow pits collected at the same site reveal that elemental reallocation similarly affects both chemicals, resulting in a generally stable signal over time. Finally, the negative correlation with the temperature proxy further supports the capability of to capture past climate‐change‐driven sea ice fluctuations.

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Publication Details

Journal
Geophysical Research Letters
Published
2026-04-15
DOI
https://doi.org/10.1029/2025gl120091
Primary Topic
Geology and Paleoclimatology Research
Type
article
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article

Bromine Enrichment Signal in Svalbard Shallow Cores Reflects Changes of Seasonal Sea Ice Variability

Clara Turetta, Jack Kohler, Catherine Larose, Jean‐Charles Gallet et al.
Geophysical Research Letters
Geology and Paleoclimatology Research
article

Bromine Enrichment Signal in Svalbard Shallow Cores Reflects Changes of Seasonal Sea Ice Variability

Clara Turetta, Jack Kohler, Catherine Larose, Jean‐Charles Gallet, David Cappelletti, Barbara Stenni, François Burgay, Elena Barbaro, Elisabeth Isaksson, Federico Scoto, Andrea Spolaor, Giuliano Dreossi, Enrico Biscaro, Jacopo Gabrieli
article en

Abstract

Abstract Bromine enrichment has been widely used as a proxy for past sea ice reconstructions. In this study, three firn cores drilled on Holtedahlfonna (Svalbard) were analyzed for trace elements. Excluding a single year data, a positive correlation was observed between and springtime sea ice variability in the potential source region during 2005–2016. Accounting for different sea ice ages, signal resulted significantly correlated only with first‐year sea ice, reinforcing its role as a major contributor to springtime gas‐phase bromine emissions. Comparisons between Na and Br concentrations in shallow cores and temporally corresponding values in annual snow pits collected at the same site reveal that elemental reallocation similarly affects both chemicals, resulting in a generally stable signal over time. Finally, the negative correlation with the temperature proxy further supports the capability of to capture past climate‐change‐driven sea ice fluctuations.

Geophysical Research LettersVol. 53(8)
Centre National de la Recherche Scientifique (FR), Ca' Foscari University of Venice (IT), University of Basel (CH), University of Perugia (IT), Institut des Géosciences de l'Environnement (FR), National Research Council (RO), National Research Council (IT), Institut de Recherche pour le Développement (FR), Norwegian Polar Institute (NO), Université Grenoble Alpes (FR)
Life below water
Openalex Percentile: Top 16%
Geology and Paleoclimatology Research
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