DATED-1 comprises a compilation of dates related to the build-up and retreat of the Eurasian (British-Irish, Scandinavian, Svalbard-Barents-Kara Seas) Ice Sheets, and time-slice maps of the Eurasian Ice sheet margins. The aim is to produce synchronous ice margin reconstructions, or time-slice maps, showing the evolution of the Eurasian ice sheets through the last glacial cycle. The maps summarise the available geological evidence and thus provide a critical empirical test for results from numerical and isostatic ice sheet modelling.
Dates are sourced from the published literature. Ice margins are based on published geological and chronological data and depict the evolution of the ice sheet extent through the last 40000 years. Between 25000 and 10000 years ago the time-slice maps document the ice sheet margin every 1000 years and include uncertainty bounds (maximum, minimum) as well as what we consider to be the most-credible (mc) based on the available evidence. Evidence for the earlier period of ice sheet build up is too sparse to represent uncertainties in the same manner. Four maps depict ice sheet development from around 40000 to 25000 years ago.
The DATED-1 database and time-slice maps are available to download in GIS shapefiles (.shp) and Google Earth (.kmz) format (data are available here). We are also considering release of alternative formats (such as NetCDF) and we welcome suggestions from data users.
DATED-1 has a census date of 1 January 2013. Full description and caveats for use of the data are given in: Hughes, A.L.C., Gyllencreutz, R., Lohne, Ø.S., Mangerud, J., Svendsen, J.I. (2016) The last Eurasian Ice Sheets – a chronological database and time-slice reconstruction, DATED-1. Boreas, 45, 1-45. doi:10.1111/bor.12142
For more information, please visit the DATED webpage.