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

Sune Olander Rasmussen; P.M. Abbott; Thomas Blunier; A.J. Bourne; E. Brook; Susanne Lilja Buchardt; C. Buizert; J. Chappettaz; Henrik Brink Clausen; E. Cook; Dorthe Dahl-Jensen; S.M. Davies; Myriam Guillevic; S. Kipfstuhl; T. Laepple; Inger Kathrine Seierstad; J.P. Severunghaus; Jørgen Peder Steffensen; Christopher Stowasser; Anders Svensson; Paul Travis Vallelonga; Bo Møllesøe Vinther; F. Wilhelms; Mai Winstrup

doi:10.5194/cp-9-2713-2013

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

Sune Olander Rasmussen, P.M. Abbott, Thomas Blunier, A.J. Bourne, E. Brook, Susanne Lilja Buchardt, C. Buizert, J. Chappettaz, Henrik Brink Clausen, E. Cook, Dorthe Dahl-Jensen, S.M. Davies, Myriam Guillevic, S. Kipfstuhl, T. Laepple, Inger Kathrine Seierstad, J.P. Severunghaus, Jørgen Peder Steffensen, Christopher Stowasser, Anders SvenssonPaul Travis Vallelonga, Bo Møllesøe Vinther, F. Wilhelms, Mai Winstrup

Physics of Ice, Climate and Earth

83 Citations (Scopus)

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.

Original language	English
Journal	Climate of the Past
Volume	9
Pages (from-to)	2713-2730
ISSN	1814-9324
DOIs	https://doi.org/10.5194/cp-9-2713-2013
Publication status	Published - 5 Dec 2013

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Rasmussen, S. O., Abbott, P. M., Blunier, T., Bourne, A. J., Brook, E., Buchardt, S. L., Buizert, C., Chappettaz, J., Clausen, H. B., Cook, E., Dahl-Jensen, D., Davies, S. M., Guillevic, M., Kipfstuhl, S., Laepple, T., Seierstad, I. K., Severunghaus, J. P., Steffensen, J. P., Stowasser, C., ... Winstrup, M. (2013). A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core. Climate of the Past, 9, 2713-2730. https://doi.org/10.5194/cp-9-2713-2013

Rasmussen, SO, Abbott, PM, Blunier, T, Bourne, AJ, Brook, E, Buchardt, SL, Buizert, C, Chappettaz, J, Clausen, HB, Cook, E, Dahl-Jensen, D, Davies, SM, Guillevic, M, Kipfstuhl, S, Laepple, T, Seierstad, IK, Severunghaus, JP, Steffensen, JP, Stowasser, C, Svensson, A, Vallelonga, PT, Vinther, BM, Wilhelms, F & Winstrup, M 2013, 'A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core', Climate of the Past, vol. 9, pp. 2713-2730. https://doi.org/10.5194/cp-9-2713-2013

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title = "A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core",

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.",

author = "Rasmussen, {Sune Olander} and P.M. Abbott and Thomas Blunier and A.J. Bourne and E. Brook and Buchardt, {Susanne Lilja} and C. Buizert and J. Chappettaz and Clausen, {Henrik Brink} and E. Cook and Dorthe Dahl-Jensen and S.M. Davies and Myriam Guillevic and S. Kipfstuhl and T. Laepple and Seierstad, {Inger Kathrine} and J.P. Severunghaus and Steffensen, {J{\o}rgen Peder} and Christopher Stowasser and Anders Svensson and Vallelonga, {Paul Travis} and Vinther, {Bo M{\o}lles{\o}e} and F. Wilhelms and Mai Winstrup",

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T1 - A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core

AU - Rasmussen, Sune Olander

AU - Abbott, P.M.

AU - Blunier, Thomas

AU - Bourne, A.J.

AU - Brook, E.

AU - Buchardt, Susanne Lilja

AU - Buizert, C.

AU - Chappettaz, J.

AU - Clausen, Henrik Brink

AU - Cook, E.

AU - Dahl-Jensen, Dorthe

AU - Davies, S.M.

AU - Guillevic, Myriam

AU - Kipfstuhl, S.

AU - Laepple, T.

AU - Seierstad, Inger Kathrine

AU - Severunghaus, J.P.

AU - Steffensen, Jørgen Peder

AU - Stowasser, Christopher

AU - Svensson, Anders

AU - Vallelonga, Paul Travis

AU - Vinther, Bo Møllesøe

AU - Wilhelms, F.

AU - Winstrup, Mai

PY - 2013/12/5

Y1 - 2013/12/5

N2 - 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.

AB - 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.

U2 - 10.5194/cp-9-2713-2013

DO - 10.5194/cp-9-2713-2013

M3 - Journal article

SN - 1814-9324

VL - 9

SP - 2713

EP - 2730

JO - Climate of the Past

JF - Climate of the Past

ER -

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

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