%0 Journal Article %T Spatial and temporal oxygen isotope variability in northern Greenland 每 implications for a new climate record over the past millennium %A Kipfstuhl %A S. %A Oerter %A H. %A Opel %A T. %A Vinther %A B. M. %A Wegner %A A. %A Weiˋbach %A S. %J - %D 2016 %R https://doi.org/10.5194/cp-12-171-2016 %X

Abstract. We present for the first time all 12 汛¹⁸O records obtained from ice cores drilled in the framework of the North Greenland Traverse (NGT) between 1993 and 1995 in northern Greenland. The cores cover an area of 680ˋkmˋˋ℅ˋˋ317ˋkm, 10ˋ% of the Greenland ice sheet. Depending on core length (100每175ˋm) and accumulation rate (90每200ˋkgˋm^ˋ2ˋa^ˋ1) the single records reflect an isotope每temperature history over the last 500每1100 years.

Lowest 汛¹⁸O mean values occur north of the summit and east of the main divide as a consequence of Greenland's topography. In general, ice cores drilled on the main ice divide show different results than those drilled east of the main ice divide that might be influenced by secondary regional moisture sources.

A stack of all NGT records and the NGRIP record is presented with improved signal-to-noise ratio. Compared to single records, this stack represents the mean 汛¹⁸O signal for northern Greenland that is interpreted as proxy for temperature. Our northern Greenland 汛¹⁸O stack indicates distinctly enriched 汛¹⁸O values during medieval times, about ADˋ1420ˋ㊣ˋ20 and from ADˋ1870 onwards. The period between ADˋ1420 and ADˋ1850 has depleted 汛¹⁸O values compared to the average for the entire millennium and represents the Little Ice Age. The 汛¹⁸O values of the 20th century are comparable to the medieval period but are lower than that about ADˋ1420.