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Projected changes in Northern Hemisphere permafrost in temperature stabilization and overshoot scenarios

Resource type
Thesis type
(Thesis) M.Sc.
Date created
2020-01-20
Authors/Contributors
Abstract
Achieving the Paris Agreement goal of “holding the increase in global temperature to well below 2°C above pre-industrial levels” is increasingly challenging. Overshoot trajectories, which assume that a temperature target is reached after temporarily exceeding it, are becoming prominent in policy discussions. This thesis explores the long-term response of northern permafrost in temperature overshoot and stabilization scenarios used for the 6th Phase of the Coupled Model Intercomparison Project (CMIP6). The University of Victoria Earth System Climate Model, an Earth System model of intermediate complexity, is forced with a range of CMIP6 scenarios. Results suggest that permafrost recovery lags the decrease in surface air temperature associated with overshoot scenarios. Depending on the scenario, 15-30% of permafrost area is lost at the time temperature is restored to the level prior to the overshoot. Furthermore, in high temperature stabilization scenarios permafrost continues to thaw after global mean temperature is stabilized.
Document
Identifier
etd20731
Copyright statement
Copyright is held by the author.
Permissions
This thesis may be printed or downloaded for non-commercial research and scholarly purposes.
Scholarly level
Supervisor or Senior Supervisor
Thesis advisor: Zickfeld, Kirsten
Member of collection
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etd20731.pdf 7.74 MB

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