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

Anna Sturevik-Storm; Ala Aldahan; Göran Possnert; Ann Marie Berggren; Raimund Muscheler; Dorthe Dahl-Jensen; Bo M. Vinther; Ilya Usoskin

doi:10.1038/srep06408

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

Anna Sturevik-Storm, Ala Aldahan, Göran Possnert, Ann Marie Berggren, Raimund Muscheler, Dorthe Dahl-Jensen, Bo M. Vinther, Ilya Usoskin

Department of Geoscience

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

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.

Original language	English
Article number	6408
Journal	Scientific reports
Volume	4
DOIs	https://doi.org/10.1038/srep06408
Publication status	Published - 2014

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title = "10 Be climate fingerprints during the Eemian in the NEEM ice core, Greenland",

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.",

author = "Anna Sturevik-Storm and Ala Aldahan and G{\"o}ran Possnert and Berggren, {Ann Marie} and Raimund Muscheler and Dorthe Dahl-Jensen and Vinther, {Bo M.} and Ilya Usoskin",

note = "Funding Information: We acknowledge financial support from the Swedish Research Council. NEEM is directed and organized by the Center of Ice and Climate at the Niels Bohr Institute and US NSF, Office of Polar Programs. It is supported by funding agencies and institutions in Belgium (FNRS-CFB and FWO), Canada (NRCan/GSC), China (CAS), Denmark (FIST), France (IPEV, CNRS/INSU, CEA and ANR), Germany (AWI), Iceland (RannIs), Japan (NIPR), Korea (KOPRI), The Netherlands (NWO/ALW), Sweden (VR), Switzerland (SNF), United Kingdom (NERC) and the USA (US NSF, Office of Polar Programs). I.U. acknowledges the financial support by the Academy of Finland to the ReSoLVE Center of Excellence (project no. 272157).",

year = "2014",

doi = "10.1038/srep06408",

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T1 - 10 Be climate fingerprints during the Eemian in the NEEM ice core, Greenland

AU - Sturevik-Storm, Anna

AU - Aldahan, Ala

AU - Possnert, Göran

AU - Berggren, Ann Marie

AU - Muscheler, Raimund

AU - Dahl-Jensen, Dorthe

AU - Vinther, Bo M.

AU - Usoskin, Ilya

N1 - Funding Information: We acknowledge financial support from the Swedish Research Council. NEEM is directed and organized by the Center of Ice and Climate at the Niels Bohr Institute and US NSF, Office of Polar Programs. It is supported by funding agencies and institutions in Belgium (FNRS-CFB and FWO), Canada (NRCan/GSC), China (CAS), Denmark (FIST), France (IPEV, CNRS/INSU, CEA and ANR), Germany (AWI), Iceland (RannIs), Japan (NIPR), Korea (KOPRI), The Netherlands (NWO/ALW), Sweden (VR), Switzerland (SNF), United Kingdom (NERC) and the USA (US NSF, Office of Polar Programs). I.U. acknowledges the financial support by the Academy of Finland to the ReSoLVE Center of Excellence (project no. 272157).

PY - 2014

Y1 - 2014

N2 - 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.

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

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