DOI: 10.5194/cp-9-2713-2013
Scopus记录号: 2-s2.0-84890307130
论文题名: A first chronology for the north greenland eemian ice drilling (NEEM) ice core
作者: 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.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 6 起始页码: 2713
结束页码: 2730
语种: 英语
Scopus关键词: biostratigraphy
; chronology
; electrical conductivity
; geoaccumulation
; ice core
; numerical model
; reconstruction
; timescale
; Arctic
; Greenland
英文摘要: 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. © 2013 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49339
Appears in Collections: 气候变化与战略
There are no files associated with this item.
Recommended Citation:
Rasmussen S.O.,Abbott P.M.,Blunier T.,et al. A first chronology for the north greenland eemian ice drilling (NEEM) ice core[J]. Climate of the Past,2013-01-01,9(6)