A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core
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 ma...
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fttriple:oai:gotriple.eu:ojBDcM-HxcFnGfDlMb5gN 2023-05-15T16:26:46+02:00 A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core 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. Winstrup, M. 2018-09-27 https://doi.org/10.5194/cp-9-2713-2013 https://cp.copernicus.org/articles/9/2713/2013/ en eng doi:10.5194/cp-9-2713-2013 10670/1.b8mics https://cp.copernicus.org/articles/9/2713/2013/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2018 fttriple https://doi.org/10.5194/cp-9-2713-2013 2023-01-22T17:54:34Z 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. Text Greenland Greenland ice core ice core NGRIP North Greenland Unknown Greenland Climate of the Past 9 6 2713 2730 |
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Open Polar |
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Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir 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. Winstrup, M. A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core |
topic_facet |
geo envir |
description |
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. |
format |
Text |
author |
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. Winstrup, M. |
author_facet |
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. Winstrup, M. |
author_sort |
Rasmussen, S. O. |
title |
A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core |
title_short |
A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core |
title_full |
A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core |
title_fullStr |
A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core |
title_full_unstemmed |
A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core |
title_sort |
first chronology for the north greenland eemian ice drilling (neem) ice core |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-9-2713-2013 https://cp.copernicus.org/articles/9/2713/2013/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core ice core NGRIP North Greenland |
genre_facet |
Greenland Greenland ice core ice core NGRIP North Greenland |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-9-2713-2013 10670/1.b8mics https://cp.copernicus.org/articles/9/2713/2013/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-9-2713-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
6 |
container_start_page |
2713 |
op_container_end_page |
2730 |
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1766015747673292800 |