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Effect of isostatic rebound on modelled ice volume variations during the last 200 kyr

Crucifix, Michel; Loutre, Marie-France; Berger, Andre; Lambeck, Kurt

Description

Deformation of the lithosphere under an ice load can be approximated using the hypothesis of local damped isostasy. This simple formulation has been systematically compared with a three-dimensional model of the crust-mantle system for simple ice-load scenarios with a period in the range 20-100 kyr. The comparison enables us to introduce the concepts of effective upper mantle density and effective relaxation time into the isostatic model for the response of the Earth to the ice sheets. These...[Show more]

dc.contributor.authorCrucifix, Michel
dc.contributor.authorLoutre, Marie-France
dc.contributor.authorBerger, Andre
dc.contributor.authorLambeck, Kurt
dc.date.accessioned2015-12-13T23:27:08Z
dc.identifier.issn0012-821X
dc.identifier.urihttp://hdl.handle.net/1885/93183
dc.description.abstractDeformation of the lithosphere under an ice load can be approximated using the hypothesis of local damped isostasy. This simple formulation has been systematically compared with a three-dimensional model of the crust-mantle system for simple ice-load scenarios with a period in the range 20-100 kyr. The comparison enables us to introduce the concepts of effective upper mantle density and effective relaxation time into the isostatic model for the response of the Earth to the ice sheets. These parameters depend on the Earth model considered, ice sheet size and the period of the load cycle. The local damped isostasy model has been implemented in the Louvain-la-Neuve climate model to assess the impact of isostasy on continental ice volume variations for the last 200 kyr. Results suggest that isostasy acts as a negative feedback for ice volume during the glaciation process and acts as a positive feedback during the deglaciation. Moreover, taking isostasy into account is necessary to simulate variations in Northern Hemisphere ice volume during isotopic stage 3. Lastly, the use of effective mantle density and effective relaxation time improves the model performance regarding SPECMAP reconstructions.
dc.publisherElsevier
dc.sourceEarth and Planetary Science Letters
dc.subjectKeywords: climate change; glacial rebound; isostasy; paleoclimate; Quaternary Climate; Cycles; Glacial rebound; Models
dc.titleEffect of isostatic rebound on modelled ice volume variations during the last 200 kyr
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume184
dc.date.issued2001
local.identifier.absfor040403 - Geophysical Fluid Dynamics
local.identifier.absfor040605 - Palaeoclimatology
local.identifier.ariespublicationMigratedxPub26535
local.type.statusPublished Version
local.contributor.affiliationCrucifix, Michel, Catholic University of Louvain
local.contributor.affiliationLoutre, Marie-France, Catholic University of Louvain
local.contributor.affiliationLambeck, Kurt, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBerger, Andre, Catholic University of Louvain
local.description.embargo2037-12-31
local.bibliographicCitation.startpage623
local.bibliographicCitation.lastpage633
local.identifier.doi10.1016/S0012-821X(00)00361-7
dc.date.updated2015-12-12T09:49:17Z
local.identifier.scopusID2-s2.0-0035080061
CollectionsANU Research Publications

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