Article
 

A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/articles/2514nq647

Descriptions

Attribute NameValues
Creator
Abstract
  • A stratigraphy-based chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core has been derived by transferring the annual layer counted Greenland Ice Core Chronology 2005 (GICC05) and its model extension (GICC05modelext) from the NGRIP core to the NEEM core using 787 match points of mainly volcanic origin identified in the electrical conductivity measurement (ECM) and dielectrical profiling (DEP) records. Tephra horizons found in both the NEEM and NGRIP ice cores are used to test the matching based on ECM and DEP and provide five additional horizons used for the timescale transfer. A thinning function reflecting the accumulated strain along the core has been determined using a Dansgaard–Johnsen flow model and an isotope-dependent accumulation rate parameterization. Flow parameters are determined from Monte Carlo analysis constrained by the observed depth-age horizons. In order to construct a chronology for the gas phase, the ice age–gas age difference (Δage) has been reconstructed using a coupled firn densification-heat diffusion model. Temperature and accumulation inputs to the Δage model, initially derived from the water isotope proxies, have been adjusted to optimize the fit to timing constraints from δ¹⁵N of nitrogen and high-resolution methane data during the abrupt onset of Greenland interstadials. The ice and gas chronologies and the corresponding thinning function represent the first chronology for the NEEM core, named GICC05modelext-NEEM-1. Based on both the flow and firn modelling results, the accumulation history for the NEEM site has been reconstructed. Together, the timescale and accumulation reconstruction provide the necessary basis for further analysis of the records from NEEM.
  • This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by Copernicus Publications on behalf of the European Geosciences Union. The published article can be found at: http://www.clim-past.net/volumes_and_issues.html.
License
Resource Type
DOI
Date Available
Date Issued
Citation
  • Rasmussen, S. O., Abbott, P. M., Blunier, T., Bourne, A. J., Brook, E., Buchardt, S. L., Buizert, C., Chappellaz, J., Clausen, H. B., Cook, E., Dahl-Jensen, D., Davies, S. M., Guillevic, M., Kipfstuhl, S., Laepple, T., Seierstad, I. K., Severinghaus, J. P., Steffensen, J. P., Stowasser, C., Svensson, A., Vallelonga, P., Vinther, B. M., Wilhelms, F., and Winstrup, M.: A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core, Climate of the Past, 9, 2713-2730, doi:10.5194/cp-9-2713-2013, 2013.
Journal Title
Journal Volume
  • 9
Journal Issue/Number
  • 6
Rights Statement
Funding Statement (additional comments about funding)
  • NEEM is directed and organized by the Centre of Iceand Climate at the Niels Bohr Institute and US NSF, Office of PolarPrograms. It is supported by funding agencies and institutionsin Belgium (FNRS-CFB and FWO), Canada (NRCan/GSC),China (CAS), Denmark (FI), France (IPEV, CNRS/INSU, CEAand ANR), Germany (AWI), Iceland (RannIs), Japan (NIPR),South Korea (KOPRI), The Netherlands (NWO/ALW), Sweden(VR), Switzerland (SNF), the United Kingdom (NERC) and theUSA (US NSF, Office of Polar Programs) and the EU SeventhFramework programmes Past4Future (FP7/2007–2013 grantagreement no. 243908), WaterundertheIce, and ERC TRACE. Thisis Past4Future contribution no. 62 and NEEM publication no. 32.
Publisher
Peer Reviewed
Language
Replaces

Relationships

Parents:

This work has no parents.

Items

Thumbnail Title Date Uploaded Visibility Actions
file details BrookEdwardCEOASFirstChronologyNorth.pdf 2017-10-16 Public Download