DOI: 10.1016/j.quascirev.2014.07.020
Scopus记录号: 2-s2.0-85027943438
论文题名: LGM hosing approach to Heinrich Event 1: Results and perspectives from data-model integration using water isotopes
作者: Roche D.M. ; Paillard D. ; Caley T. ; Waelbroeck C.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 106 起始页码: 247
结束页码: 261
语种: 英语
英文关键词: Heinrich Event 1
; Model-data integration
; Oxygen isotopes modelling
Scopus关键词: Calcite
; Data integration
; Isotopes
; Marine applications
; Sea ice
; Water
; Freshwater fluxes
; Heinrich Events
; Model data
; Model integration
; Model sensitivity
; Oxygen isotopes
; Spatial anomalies
; Thermohaline circulations
; Climate models
; climate modeling
; Heinrich event
; ice sheet
; iceberg
; isotope
; paleoceanography
; perturbation
; stable isotope
; statistical analysis
; thermohaline circulation
; Atlantic Ocean
; Labrador Sea
英文摘要: Freshwater hosing has long been used in climate models to represent the perturbation associated with the release of icebergs during Heinrich Events. However, freshwater hosing ignores some of the icebergs-induced feedbacks on climate. It therefore bears the question whether the perturbed climate obtained through classical freshwater hosing experiments is realistic enough to be used as a proxy for a Heinrich Event. Using the fully coupled, water isotope enabled, climate model iLOVECLIM, we conducted a series of freshwater hosing experiments, accounting for the depleted signature of ice-sheet sourced water, under LGM conditions. Using paleoceanographic data, we integrated simulated and measured δ18Ocalcite at the surface and within the ocean column to evaluate whether (i) LGM freshwater hosing is a good proxy for Heinrich Event 1 and whether (ii) different sources for the freshwater in the North Atlantic result in different spatial anomalies that could be used to fingerprint the source of melt water. Results obtained with two sets of experiments indicate that first order simulated δ18Ocalcite anomalies are broadly consistent with the measured anomalies and that a complete shutdown of the thermohaline circulation is not consistent with the reconstructed patterns from foraminiferal calcite. A more detailed statistical analysis of the planktic and benthic δ18Ocalcite anomalies shows that the best experiment is obtained for a severely disturbed thermohaline circulation but not a complete shutdown. With our model sensitivity, this corresponds to a freshwater flux between 0.18Sv and 0.3Sv. Our results also indicate a better agreement when the freshwater flux is applied in the Labrador Sea than when directly applied to the Ruddiman Belt. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60100
Appears in Collections: 过去全球变化的重建
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作者单位: Earth and Climate Cluster, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands; Laboratoire des Sciences du Climat et de l'Environnement (LSCE), UMR8212, CEA/CNRS-INSU/UVSQ, Gif-sur-Yvette Cedex, France
Recommended Citation:
Roche D.M.,Paillard D.,Caley T.,et al. LGM hosing approach to Heinrich Event 1: Results and perspectives from data-model integration using water isotopes[J]. Quaternary Science Reviews,2014-01-01,106