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Technical note on the MEM gap-filling methodology:The MEM infilled data have been generated using the Fahlmann and Ulrych (1982) MEM #interpolation scheme. The MEM infilling is carried out iteratively by first filling out the smallest gap in the #data, and then use progressively larger and larger data sections (connected by small infilled gaps) to infill larger and larger gaps in the data series. The AR order of the MEM infilling routine is adaptive (as it is limited by the length of the data sections without gaps used to calculate the AR coefficients), but the AR order #has nevertheless been capped at a maximum of500 irrespective of data availability. RECAP ice core d18O data from CFA measurements averaged in 5mm depth intervals.

The RECAP ice core was drilled on Renland ice cap, coastal East Greenland, in May-June 2015. This dataset presents the first complete timescale for the ice core record, based on impurity (dust and chemistry) as well as gas content measurements. The underlying dust particle and gas (CH4, d15N and d18Oair) data are presented. Strontium and Neodymium measurements of potential dust source samples collected from exposed terrain in central East Greenland are also presented. The timescale is called 'RECAP GICC05modelext Time Scale (version 1/3-2018)' and has been synchronized to the existing GICC05modelext timescale. All synchronization tiepoints are presented. Supplement to: Simonsen, Marius Folden; Baccolo, Giovanni; Blunier, Thomas; Borunda, Alejandra; Delmonte, Barbara; Frei, Robert; Goldstein, Steven L; Grinsted, Aslak; Kjær, Helle Astrid; Sowers, Todd A; Svensson, Anders M; Vinther, Bo Møllesøe; Vladimirova, Diana; Winckler, Gisela; Winstrup, Mai; Vallelonga, Paul T (2019): East Greenland ice core dust record reveals timing of Greenland ice sheet advance and retreat. Nature Communications, 10(1)