The Importance of Icelandic Ice Sheet Growth and Retreat on Mantle CO2 Flux

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Dokumenter

DOI

  • John J. Armitage, Institut de Physique du Globe de Paris
  • ,
  • David J. Ferguson, Leeds University
  • ,
  • Kenni D. Petersen
  • ,
  • Timothy T. Creyts, Lamont-Doherty Earth Observatory

Climate cycles may significantly affect the eruptive behavior of terrestrial volcanoes due to pressure changes caused by glacial loading, which raises the possibility that climate change may modulate CO2 degassing via volcanism. In Iceland, magmatism is likely to have been influenced by glacial activity. To explore if deglaciation therefore impacted CO2 flux, we coupled a model of glacial loading over the last ∼120 ka to melt generation and transport. We find that a nuanced relationship exists between magmatism and glacial activity. Enhanced CO2 degassing happened prior to the main phase of late-Pleistocene deglaciation, and it is sensitive to the duration of the growth of the ice sheet entering into the Last Glacial Maximum (LGM), as well as the rate of ice loss. Ice sheet growth depresses melting in the upper mantle, creating a delayed pulse of CO2 out-gassing, as the magmatic system recovers from the effects of loading.

OriginalsprogEngelsk
TidsskriftGeophysical Research Letters
Vol/bind46
Nummer12
Sider (fra-til)6451-6458
Antal sider8
ISSN0094-8276
DOI
StatusUdgivet - jun. 2019

Se relationer på Aarhus Universitet Citationsformater

ID: 161333599