This data compilation is a collaborative effort by the CLIVASH2k (Climate Variability in Antarctica and the Southern Hemisphere over the past 2000 years) working group, part of the PAGES2k network. The database is a compilation of sodium and sulphate records from Antarctic ice cores spanning the past 2000 years, and contains a combination of published records (sourced from public archives), and unpublished data submitted to the CLIVASH2k call. All data are provided as annual averages (Jan-Dec). This database includes the annually resolved section of each original dataset (in the annual_resolution folder) and the coarser than annual sections (in the coarse_resolution folder). Annual averages for the oldest and most recent years were only included if the available data covered more than half of the year. All concentration values are presented in parts per billion (ppb). All flux values are presented in ppb by kilogram per square meter (ppb kg m-2). Data for each species are contained in separate CSV files; Sodium concentration (Na_concentration), Sodium flux (Na_flux), Sulphate concentration (SO4_concentration), Sulphate flux (SO4_flux), Excess Sulphate (xsSO4), Excess Sulphate flux (xsSO4_flux). Each file contains the data for all sites. The Excess Sulphate and Excess Sulphate flux calculations assume that all Na comes from the ocean (according to the standard seawater ion ratio as in [Holland, 1978]). Data were submitted in both the ionic (e.g. SO42-) and elemental forms (S). Elemental S has been converted to sulphate (SO42-) by multiplying by three. A data description publication accompanies this database: Thomas et al., The CLIVASH2k ice core chemistry database: an Antarctic compilation of sodium and sulphate records spanning the past 2000 years. Earth System Science Data. This database was created with the support of the CLIVASH2k project.

This dataset presents the microparticle and ion fluxes from a set of ice cores from the Antarctic Peninsula and Ellsworth Land, as presented in Tetzner et al. (2022). Microparticle (MPC_flux) and ionic (nssCa+2_flux, nssK+_flux, ssNa+_flux, MSA_flux) data are provided as annual fluxes for the 1992-2019 CE interval. Annual fluxes were calculated as winter-to-winter averages. Data points represent the annual austral winter-to-winter average and are presented over the correspondent austral summer. The dataset comprises timeseries CSV files. The first column represents years between 1992 and 2019 CE, and the remaining columns represent annual flux data as the number of microparticles (particles) or ion concentration (ppb), multiplied by annual snow accumulation (kg m-2), listed for each ice core site alphabetically (Jurassic (JUR), Sherman Island (SHIC) and Sky-Blu (SKBL)). This dataset was created with the support of the Comision Nacional de Investigacion Cientifica y Tecnologica (grant number 72180432).