Antarctic ice and sediment flux in the Oligocene simulated by a climate-ice sheet-sediment model

David Pollard, Robert M. DeConto

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A model of deforming sediment is added to a climate-ice sheet model, and applied to the Eocene-Oligocene transition in Antarctic ice volume around 34 Ma. The coupling between the global climate and ice sheet models is asynchronous, with a climate simulation performed once every 10 000 years, and only for the first 40 000 years. These global climate model solutions are re-used to perform runs of 400 000 years in length, with orbital forcing and different levels of CO2. The sediment model includes bulk transport under ice, generation of sub-ice till, and river transport, and predicts the continental-scale evolution of sediment thickness and coastal discharge. For the first few 10 000's of years after the onset of substantial ice (triggered by CO2 falling below ∼ 3 X pre-industrial level), sediment discharge to the ocean is relatively uniform around the coast, derived from nearby pre-existing regolith. After that, most discharge is concentrated into ∼ 4 sites at the mouths of major trough systems, with orbitally paced pulses on 104-yr scales. These sites and the average magnitudes of the fluxes agree generally with those deduced from offshore seismic and core data, although longer (10 my) integrations are needed to model the real sediment evolution.

Original languageEnglish (US)
Pages (from-to)53-67
Number of pages15
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume198
Issue number1-2
DOIs
StatePublished - Sep 15 2003

Fingerprint

ice sheet
Oligocene
ice
climate
sediments
sediment
global climate
orbital forcing
sediment thickness
regolith
sediment yield
climate models
climate modeling
trough
Eocene
mouth
oceans
coast
coasts
ocean

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Palaeontology

Cite this

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abstract = "A model of deforming sediment is added to a climate-ice sheet model, and applied to the Eocene-Oligocene transition in Antarctic ice volume around 34 Ma. The coupling between the global climate and ice sheet models is asynchronous, with a climate simulation performed once every 10 000 years, and only for the first 40 000 years. These global climate model solutions are re-used to perform runs of 400 000 years in length, with orbital forcing and different levels of CO2. The sediment model includes bulk transport under ice, generation of sub-ice till, and river transport, and predicts the continental-scale evolution of sediment thickness and coastal discharge. For the first few 10 000's of years after the onset of substantial ice (triggered by CO2 falling below ∼ 3 X pre-industrial level), sediment discharge to the ocean is relatively uniform around the coast, derived from nearby pre-existing regolith. After that, most discharge is concentrated into ∼ 4 sites at the mouths of major trough systems, with orbitally paced pulses on 104-yr scales. These sites and the average magnitudes of the fluxes agree generally with those deduced from offshore seismic and core data, although longer (10 my) integrations are needed to model the real sediment evolution.",
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Antarctic ice and sediment flux in the Oligocene simulated by a climate-ice sheet-sediment model. / Pollard, David; DeConto, Robert M.

In: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 198, No. 1-2, 15.09.2003, p. 53-67.

Research output: Contribution to journalArticle

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