Skip navigation
SuUB logo
DSpace logo

  • Home
  • Institutions
    • University of Bremen
    • City University of Applied Sciences
    • Bremerhaven University of Applied Sciences
  • Sign on to:
    • My Media
    • Receive email
      updates
    • Edit Account details

Citation link: https://doi.org/10.26092/elib/2018
PhD-Thesis_Hinck_2022.pdf
OpenAccess
 
by 4.0

Impact of glacio-lacustrine interactions on ice-sheet dynamics


File Description SizeFormat
PhD-Thesis_Hinck_2022.pdfThesis19.63 MBAdobe PDFView/Open
Authors: Hinck, Sebastian  
Supervisor: Lohmann, Gerrit  
1. Expert: Lohmann, Gerrit  
Experts: Humbert, Angelika  
Abstract: 
Geological records show that large proglacial lakes existed along the land-terminating margins of the Quaternary ice sheets. The major lakes formed in basins that were left deeply depressed due to delayed glacial isostatic adjustment (GIA) when the ice sheets retreated. As the environment around the retreating ice margin is quite dynamic, the lake basins constantly change. Where an ice sheet and proglacial lake are in contact, the dynamics are similar to a marine terminating ice-sheet margin. Such lacustrine boundary conditions cause changes in the ice-sheet’s geometry, stress balance and frontal ablation and therefore affect its entire mass balance. Despite this, dynamically evolving proglacial lakes have rarely been considered in detail in ice-sheet modelling endeavors.

In this Ph.D. project, the impact of proglacial lakes on the ice-sheet dynamics are investigated using numerical methods. For this reason, I implemented a new proglacial lake boundary model into the Parallel Ice Sheet Model (PISM). This model computes the lake basins each timestep according to the dynamic geometry of the ice-sheet and topography. The lake–ice interface is implemented as a generalization of the marine boundary of PISM.

In the first study, the underlying algorithm, LakeCC, is tested to determine if it is capable of reconstructing known lakes. Therefore, it is applied to paleo-topographic reconstructions of North America.
In a second study, the impact of the PISM-LakeCC model on the ice-sheet dynamics is tested by running several simplified experiments of the glacial retreat of the North American ice sheets after the Last Glacial Maximum (LGM). Compared to control runs, the lake experiments exhibit an accelerated glacial retreat. Furthermore, for the Laurentide ice sheet (LIS), the presence of lakes triggers a process similar to marine ice sheet instability (MISI), which causes the final collapse of the ice saddle over Hudson Bay.
Keywords: ice sheets; proglacial lakes; Ice sheet modelling
Issue Date: 13-Dec-2022
Type: Dissertation
DOI: 10.26092/elib/2018
URN: urn:nbn:de:gbv:46-elib66039
Research data link: https://doi.org/10.5281/zenodo.4304672
Institution: Universität Bremen 
Faculty: Fachbereich 01: Physik/Elektrotechnik (FB 01) 
Appears in Collections:Dissertationen

  

Page view(s)

304
checked on May 11, 2025

Download(s)

76
checked on May 11, 2025

Google ScholarTM

Check


This item is licensed under a Creative Commons License Creative Commons

Legal notice -Feedback -Data privacy
Media - Extension maintained and optimized by Logo 4SCIENCE