High resolution continuous flow analysis impurity data from the Mount Brown South ice core, East Antarctica

The Mount Brown South ice core (MBS 69.111 degrees S 86.312 degrees E) is a new, high resolution ice core drilled in coastal East Antarctica. With mean annual accumulation estimated to be similar to 30 cm ice equivalent throughout the length of the core (similar to 290 m), MBS represents a high resolution archive of ice core data spanning 1137 years (873-2008 CE), from an area previously underrepresented by high resolution ice core data.Here, we present a high-resolution dataset of chemistry and impurities obtained via continuous flow analysis (CFA). The dataset consists of meltwater electrolytic conductivity, sodium (Na+), ammonium (NH4+), hydrogen peroxide (H2O2), and insoluble microparticle measurements. The data are presented in three datasets: as a 1 mm depth resolution record, 3 cm averaged record, and decadal average record. The 1 mm record represents an oversampling of the true resolution, as due to smoothing effects the actual resolution is closer to 3 cm for some species. Therefore, the 3 cm resolution dataset is considered to be the minimum true resolution given the system setup. We also describe the current Copenhagen CFA system, and provide a detailed assessment of data quality, precision, and functional resolution.The 1 mm averaged, 3 cm averaged, and MBS2023 decadal averaged datasets are available at the Australian Antarctic Data Center: 10.26179/9tke-0s16 .