A Model of the Greenland Ice Sheet Deglaciation

• Main Author: Lecavalier, Benoit
• Format: Thesis
• Language: English
• Published: Université d'Ottawa / University of Ottawa 2014
• Subjects: ice sheets; sea-level; climate; geodesy; numerical modelling; computational geophysics; Greenland; ice core; Ice Sheet
• Online Access: https://dx.doi.org/10.20381/ruor-3396; http://www.ruor.uottawa.ca/handle/10393/30362

The goal of this thesis is to improve our understanding of the Greenland ice sheet (GrIS) and how it responds to climate change. This was achieved using ice core records to infer elevation changes of the GrIS during the Holocene (11.7 ka BP to Present). The inferred elevation changes show the response of the ice sheet interior to the Holocene Thermal Maximum (HTM; 9-5 ka BP) when temperatures across Greenland were warmer than present. These ice-core derived thinning curves act as a new set of key constraints on the deglacial history of the GrIS. Furthermore, a calibration was conducted on a three-dimensional thermomechanical ice sheet, glacial isostatic adjustment, and relative sea-level model of GrIS evolution during the most recent deglaciation (21 ka BP to present). The model was data-constrained to a variety of proxy records from paleoclimate archives and present-day observations of ice thickness and extent.