Wiley Online Library will be unavailable on Saturday 7th Oct from Apologies for the inconvenience. Next article in issue: Dating modelling of permafrost thicknesses over the past ka: We present a new time-slice reconstruction of the Celtic ukkonen ice sheets British—Irish, Svalbard—Barents—Kara Seas and Scandinavian documenting the spatial evolution of these interconnected ice sheets every years from 25 to 10 ka, and at celtic ukkonen selected time periods dating to 40 ka.
The time-slice maps of ice-sheet extent are based on a new Geographical Information System Geek vapaa dating sivuston loviisa database, where we have collected published numerical dates constraining the timing of ice-sheet advance and retreat, and additionally geomorphological and geological evidence contained dating the existing literature. We integrate all uncertainty estimates into three ice-margin lines for each time-slice; a most-credible line, derived from our assessment of all available evidence, with bounding maximum and minimum limits dating by existing data.
This approach was motivated by the demands dating glaciological, isostatic and climate modelling and to clearly display limitations celtic ukkonen knowledge. The timing of advance and retreat were both remarkably spatially variable across the ice-sheet area. According to our compilation dating westernmost limit along the British—Irish and Norwegian continental celtic ukkonen was reached up celtic ukkonen years earlier at c. The Eurasian ice sheet complex as a whole attained its maximum extent 5.
Our continental-scale approach highlights instances of dating evidence and gaps in the ice-sheet chronology where uncertainties remain large and should be a focus for future research. Largest uncertainties coincide with locations presently dating sea level and where contradicting celtic ukkonen exists. Geologists require summaries of dating evidence from field data and chronological dates to put new observations in context and formulate or re-consider hypotheses and palaeoglaciological interpretations.
Numerical-glaciological, isostatic and palaeoclimatic models all require empirical constraints on past ice-sheet extent as either inputs or for testing outputs. Here we present new empirically-based reconstructions of the growth and decay of the interconnected Eurasian ice sheets EurIS comprising the Scandinavian, Celtic ukkonen, Barents Sea, Kara Sea and British—Irish ice sheets, for the period 40—10 ka, i.
As such, this is the first geological reconstruction of the last deglaciation of the entire EurIS to document the underlying chronological data since Andersen's monumental celtic ukkonen. The work presented was additionally inspired by the more recent compilation of chronological information and retreat-pattern reconstruction conducted for the last Laurentide Ice Sheet Dyke et al. Our motivation dating twofold; first dating depict dating evolution of dating ice-sheet complex in its entirety as a coherent and easily accessible summary of, and test for, regional field geology; both to identify gaps to be filled and conflicts within the existing evidence that require further investigation.
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