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

Sea ice is a key component of Earth's climate system, and understanding its dynamics is essential in refining future models' accuracy. In this study, we analyzed three firn cores drilled on the Holtedahlfonna glacier (Svalbard), using bromine enrichment as a proxy to reconstruct past sea ice variability. Our main focus was to better understand the role of sea ice age in modulating the proxy signal and the impact of snow melting on the preservation of the tracer. The outcomes of our research confirm that this geochemical marker is mostly influenced by seasonal sea ice and past atmospheric temperature variability, remaining relatively well‐preserved over time.