The Importance of Icelandic Ice Sheet Growth and Retreat on Mantle CO 2 Flux

International audience 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 inf...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Armitage, John, Ferguson, David, Petersen, Kenni, Creyts, Timothy
Other Authors: Institut de Physique du Globe de Paris (IPGP (UMR_7154)), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), School of Earth and Environment Leeds (SEE), University of Leeds, Aarhus University Aarhus, Lamont-Doherty Earth Observatory (LDEO), Columbia University New York, French National Research Agency (ANR)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2019
Subjects:
SEA-LEVEL
VOLCANISM
RIDGE
DEGLACIATION
SENSITIVITY
THOLEIITES
CALIFORNIA
INVERSION
EMISSIONS
VELOCITY
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology
Ice Sheet
Iceland
Online Access:https://hal-insu.archives-ouvertes.fr/insu-02919791
https://hal-insu.archives-ouvertes.fr/insu-02919791/document
https://hal-insu.archives-ouvertes.fr/insu-02919791/file/Armitage_et_al-2019-Geophysical_Research_Letters.pdf
https://doi.org/10.1029/2019GL081955
Description
Summary:International audience 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 similar to 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.

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