(10)Be climate fingerprints during the Eemian in the NEEM ice core, Greenland.

Research output: Contribution to journalArticle

Abstract

Several deep Greenland ice cores have been retrieved, however, capturing the Eemian period has been problematic due to stratigraphic disturbances in the ice. The new Greenland deep ice core from the NEEM site (77.45°N, 51.06°W, 2450 m.a.s.l) recovered a relatively complete Eemian record. Here we discuss the cosmogenic (10)Be isotope record from this core. The results show Eemian average (10)Be concentrations about 0.7 times lower than in the Holocene which suggests a warmer climate and approximately 65-90% higher precipitation in Northern Greenland compared to today. Effects of shorter solar variations on (10)Be concentration are smoothed out due to coarse time resolution, but occurrence of a solar maximum at 115.26-115.36 kyr BP is proposed. Relatively high (10)Be concentrations are found in the basal ice sections of the core which may originate from the glacial-interglacial transition and relate to a geomagnetic excursion about 200 kyr BP.

Details

Authors
  • Anna Sturevik-Storm
  • Ala Aldahan
  • Göran Possnert
  • Ann-Marie Berggren
  • Raimund Muscheler
  • Dorthe Dahl-Jensen
  • Bo M Vinther
  • Ilya Usoskin
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Geography
Original languageEnglish
Article number6408
JournalScientific Reports
Volume4
Publication statusPublished - 2014
Publication categoryResearch
Peer-reviewedYes