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Duration of Greenland Stadial 22 and ice-gas Delta age from counting of annual layers in Greenland NGRIP ice core
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2012 (English)In: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 8Article in journal (Refereed) Published
Abstract [en]

High-resolution measurements of chemical impurities and methane concentrations in Greenland ice core samples from the early glacial period allow the extension of annual-layer counted chronologies and the improvement of gas age-ice age difference (Delta age) essential to the synchronization of ice core records. We report high-resolution measurements of a 50m section of the NorthGRIP ice core and corresponding annual layer thicknesses in order to constrain the duration of the Greenland Stadial 22 (GS-22) between Greenland Interstadials (GIs) 21 and 22, for which inconsistent durations and ages have been reported from Greenland and Antarctic ice core records as well as European speleothems. Depending on the chronology used, GS-22 occurred between approximately 89 (end of GI-22) and 83 kyr b2k (onset of GI-21). From annual layer counting, we find that GS-22 lasted between 2696 and 3092 years and was followed by a GI-21 pre-cursor event lasting between 331 and 369 yr. Our layer-based counting agrees with the duration of stadial 22 as determined from the NALPS speleothem record (3250 +/- 526 yr) but not with that of the GICC05modelext chronology (2620 yr) or an alternative chronology based on gas-marker synchronization to EPICA Dronning Maud Land ice core. These results show that GICC05modelext overestimates accumulation and/or underestimates thinning in this early part of the last glacial period. We also revise the possible ranges of NorthGRIP Delta depth (5.49 to 5.85 m) and Delta age (498 to 601 yr) at the warming onset of GI-21 as well as the Delta age range at the onset of the GI-21 precursor warming (523 to 654 yr), observing that temperature (represented by the delta N-15 proxy) increases before CH4 concentration by no more than a few decades.

Place, publisher, year, edition, pages
2012. Vol. 8
Keyword [en]
last glacial period continuous-flow analysis abrupt climate-change millennial-scale polar ice northgrip antarctica record synchronization variability Geology Meteorology & Atmospheric Sciences
Research subject
SWEDARCTIC 1997, NordGRIP 1997; SWEDARCTIC 1998, NordGRIP 1998; SWEDARCTIC 1999, NordGRIP 1999; SWEDARCTIC 2000, NordGRIP 2000; SWEDARCTIC 2001, NordGRIP 2001; SWEDARCTIC 2002, NordGRIP 2002; SWEDARCTIC 2003, NordGRIP 2003; SWEDARCTIC 2004, NordGRIP 2004
Identifiers
URN: urn:nbn:se:polar:diva-1938DOI: 10.5194/cp-8-1839-2012OAI: oai:DiVA.org:polar-1938DiVA: diva2:810350
Note

ISI Document Delivery No.: 058XP Times Cited: 8 Cited Reference Count: 36 Vallelonga, P. Bertagna, G. Blunier, T. Kjaer, H. A. Popp, T. J. Rasmussen, S. O. Steffensen, J. P. Stowasser, C. Svensson, A. S. Warming, E. Winstrup, M. Bigler, M. Kipfstuhl, S. Svensson, Anders/A-2643-2010; Rasmussen, Sune/B-5560-2008; Blunier, Thomas/M-4609-2014; Winstrup, Mai/M-5844-2014 Svensson, Anders/0000-0002-4364-6085; Rasmussen, Sune/0000-0002-4177-3611; Blunier, Thomas/0000-0002-6065-7747; Winstrup, Mai/0000-0002-4794-4004 Denmark (SNF/FNU); Belgium (FNRS-CFB); France (IFRTP); France (INSU/CNRS); Germany (AWI); Iceland (RannIs); Japan (MEXT); Sweden (SPRS); Switzerland (SNF); United States of America (NSF) We thank Bo Vinther, Emelie Capron, Amaelle Landais and Myriam Guillevic for helpful discussions. This work is a contribution to the NorthGRIP ice core project, which is directed and organized by the Centre for Ice and Climate at the Niels Bohr Institute, University of Copenhagen. It is being supported by funding agencies in Denmark (SNF/FNU), Belgium (FNRS-CFB), France (IFRTP and INSU/CNRS), Germany (AWI), Iceland (RannIs), Japan (MEXT), Sweden (SPRS), Switzerland (SNF) and the United States of America (NSF). 8 Copernicus gesellschaft mbh Gottingen Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences

Available from: 2015-05-07 Created: 2015-05-06 Last updated: 2015-06-03

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