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. The presence of marine microfossils (diatoms) in glacierice and ice cores has been documented from numerous sites in Antarctica,Greenland, as well as from sites in the Andes and the Altai mountains, andattributed to entrainment and transport by winds. However, their presenceand diversity in snow and ice, especially in polar regions, are not welldocumented and still poorly understood. Here we present the first data toresolve the regional and temporal distribution of diatoms in ice cores,spanning a 20-year period across four sites in the Antarctic Peninsula andEllsworth Land, Antarctica. We assess the regional variability in diatomcomposition and abundance at annual and sub-annual resolution across allfour sites. These data corroborate the prevalence of contemporary marinediatoms in Antarctic Peninsula ice cores, reveal that the timing and amountof diatoms deposited vary between low- and high-elevation sites, and supportexisting evidence that marine diatoms have the potential to yield a novelpalaeoenvironmental proxy for ice cores in Antarctica.

Regional variability of diatoms in ice cores from the Antarctic Peninsula and Ellsworth Land, Antarctica