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...
Published in: | Climate of the Past |
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Language: | English |
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European Geosciences Union (EGU)
2013
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Online Access: | https://oskar-bordeaux.fr/handle/20.500.12278/38155 https://doi.org/10.5194/cp-9-2713-2013 |
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/38155 2023-05-15T16:26:54+02:00 A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core RASMUSSEN, S. ABBOTT, P. BLUNIER, T. BOURNE, A. BROOK, E. BUCHARDT, S. BUIZERT, C. CHAPPELLAZ, J. CLAUSEN, H. COOK, E. DAHL-JENSEN, D. DAVIES, S. GUILLEVIC, M. KIPFSTUHL, S. LAEPPLE, T. SEIERSTAD, I. SEVERINGHAUS, J. STEFFENSEN, J. STOWASSER, C. SVENSSON, A. VALLELONGA, P. VINTHER, B. WILHELMS, F. WINSTRUP, M. 2013 https://oskar-bordeaux.fr/handle/20.500.12278/38155 https://doi.org/10.5194/cp-9-2713-2013 en eng European Geosciences Union (EGU) 1814-9324 https://oskar-bordeaux.fr/handle/20.500.12278/38155 doi:10.5194/cp-9-2713-2013 Planète et Univers [physics]/Sciences de la Terre/Climatologie Article de revue 2013 ftoskarbordeaux https://doi.org/10.5194/cp-9-2713-2013 2021-05-11T22:30:07Z 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. Other/Unknown Material Greenland Greenland ice core ice core NGRIP North Greenland OSKAR Bordeaux (Open Science Knowledge ARchive) Greenland Climate of the Past 9 6 2713 2730 |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
Planète et Univers [physics]/Sciences de la Terre/Climatologie |
spellingShingle |
Planète et Univers [physics]/Sciences de la Terre/Climatologie RASMUSSEN, S. ABBOTT, P. BLUNIER, T. BOURNE, A. BROOK, E. BUCHARDT, S. BUIZERT, C. CHAPPELLAZ, J. CLAUSEN, H. COOK, E. DAHL-JENSEN, D. DAVIES, S. GUILLEVIC, M. KIPFSTUHL, S. LAEPPLE, T. SEIERSTAD, I. SEVERINGHAUS, J. STEFFENSEN, J. STOWASSER, C. SVENSSON, A. VALLELONGA, P. VINTHER, B. WILHELMS, F. WINSTRUP, M. A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core |
topic_facet |
Planète et Univers [physics]/Sciences de la Terre/Climatologie |
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 |
Other/Unknown Material |
author |
RASMUSSEN, S. ABBOTT, P. BLUNIER, T. BOURNE, A. BROOK, E. BUCHARDT, S. BUIZERT, C. CHAPPELLAZ, J. CLAUSEN, H. COOK, E. DAHL-JENSEN, D. DAVIES, S. GUILLEVIC, M. KIPFSTUHL, S. LAEPPLE, T. SEIERSTAD, I. SEVERINGHAUS, J. STEFFENSEN, J. STOWASSER, C. SVENSSON, A. VALLELONGA, P. VINTHER, B. WILHELMS, F. WINSTRUP, M. |
author_facet |
RASMUSSEN, S. ABBOTT, P. BLUNIER, T. BOURNE, A. BROOK, E. BUCHARDT, S. BUIZERT, C. CHAPPELLAZ, J. CLAUSEN, H. COOK, E. DAHL-JENSEN, D. DAVIES, S. GUILLEVIC, M. KIPFSTUHL, S. LAEPPLE, T. SEIERSTAD, I. SEVERINGHAUS, J. STEFFENSEN, J. STOWASSER, C. SVENSSON, A. VALLELONGA, P. VINTHER, B. WILHELMS, F. WINSTRUP, M. |
author_sort |
RASMUSSEN, S. |
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 |
publisher |
European Geosciences Union (EGU) |
publishDate |
2013 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/38155 https://doi.org/10.5194/cp-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_relation |
1814-9324 https://oskar-bordeaux.fr/handle/20.500.12278/38155 doi:10.5194/cp-9-2713-2013 |
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 |
_version_ |
1766015924138147840 |