Abstract Bromine enrichment Brenr $left(mathrm{B}{mathrm{r} }{mathrm{e}mathrm{n}mathrm{r} }right)$ 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 Brenr $mathrm{B}{mathrm{r} }{mathrm{e}mathrm{n}mathrm{r} }$ and springtime sea ice variability in the potential source region during 2005–2016. Accounting for different sea ice ages, Brenr $mathrm{B}{mathrm{r} }{mathrm{e}mathrm{n}mathrm{r} }$ 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 Brenr $mathrm{B}{mathrm{r} }{mathrm{e}mathrm{n}mathrm{r} }$ signal over time. Finally, the negative correlation with the δ18O ${delta }^{mathrm{18} }mathrm{O}$ temperature proxy further supports the capability of Brenr $mathrm{B}{mathrm{r} }_{mathrm{e}mathrm{n}mathrm{r} }$ to capture past climate‐change‐driven sea ice fluctuations.
Last updated: April 16, 2026 01:01 PM
CO₂
431.9ppm
+1.9
/ year
CH₄
1945.85ppb
+8.44
/ year
Temp
+1.48°C
Peak +1.73°C
Population
8.1B
+67M
/ year