Ocean-glacier interaction on the large regional scale
Glaciers are important regulators of water availability in many regions of the world and their retreat can lead to increased geohazards. Glacier melt has contributed significantly to sea-level rise in the past and has become the biggest single source of observed sea-level rise since 1900, even if th...
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Universität Bremen
2020
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/4637 2023-05-15T13:42:31+02:00 Ocean-glacier interaction on the large regional scale Recinos, Beatriz Marzeion, Ben McNabb, Robert 2020-12-21 application/pdf https://media.suub.uni-bremen.de/handle/elib/4637 https://doi.org/10.26092/elib/434 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib46378 eng eng Universität Bremen Fachbereich 08: Sozialwissenschaften (FB 08) https://media.suub.uni-bremen.de/handle/elib/4637 http://dx.doi.org/10.26092/elib/434 doi:10.26092/elib/434 urn:nbn:de:gbv:46-elib46378 info:eu-repo/semantics/openAccess Attribution 3.0 Germany http://creativecommons.org/licenses/by/3.0/de/ CC-BY Calving Glaciers Tidewater Sea level rise Sea level modelling 550 550 Earth sciences and geology ddc:550 Dissertation doctoralThesis 2020 ftsubbremen https://doi.org/10.26092/elib/434 2022-11-09T07:10:13Z Glaciers are important regulators of water availability in many regions of the world and their retreat can lead to increased geohazards. Glacier melt has contributed significantly to sea-level rise in the past and has become the biggest single source of observed sea-level rise since 1900, even if the ice mass stored in glaciers is small compared to the Greenland and Antarctic ice sheets (<1%). Glacier melt has and will continue to be a major source of sea-level rise in the 21st century. Therefore, it is a pressing task to improve the knowledge of how glaciers change when subjected to climate change, both natural and anthropogenic. About 30% of the glaciers on earth terminate in the ocean and frontal ablation (mass loss by calving and frontal melting) is a major component of the mass budget of tidewater glaciers, strongly affecting their dynamics. Most global scale ice volume estimates to date still suffer from considerable uncertainties related to i) the implemented frontal ablation parameterization or ii) not accounting for frontal ablation at all in the glacier model. To improve estimates of the ice thickness distribution of tidewater glaciers, it is thus important to identify and test low-cost and robust parameterizations of this process. By implementing such parameterization into the ice-thickness estimation module of the Open Global Glacier Model (OGGM v1.1.2), this thesis conducts a first assessment of the impact of accounting for frontal ablation on the estimate of ice stored in glaciers located in Alaska and Greenland. OGGM is the first globally applicable, open source, community-driven model for consistently simulating past and future global scale glacier change. It's ice thickness inversion scheme relies on a mass-conservation approach, this thesis found that if frontal ablation is neglected from the mass balance budget, the model systematically underestimated the mass turnover, and therefore the thickness and volume of tidewater glaciers. This underestimation can amount to up to 19% on a regional ... Doctoral or Postdoctoral Thesis Antarc* Antarctic glacier glacier glaciers Greenland Tidewater Alaska Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Antarctic Greenland |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
Calving Glaciers Tidewater Sea level rise Sea level modelling 550 550 Earth sciences and geology ddc:550 |
spellingShingle |
Calving Glaciers Tidewater Sea level rise Sea level modelling 550 550 Earth sciences and geology ddc:550 Recinos, Beatriz Ocean-glacier interaction on the large regional scale |
topic_facet |
Calving Glaciers Tidewater Sea level rise Sea level modelling 550 550 Earth sciences and geology ddc:550 |
description |
Glaciers are important regulators of water availability in many regions of the world and their retreat can lead to increased geohazards. Glacier melt has contributed significantly to sea-level rise in the past and has become the biggest single source of observed sea-level rise since 1900, even if the ice mass stored in glaciers is small compared to the Greenland and Antarctic ice sheets (<1%). Glacier melt has and will continue to be a major source of sea-level rise in the 21st century. Therefore, it is a pressing task to improve the knowledge of how glaciers change when subjected to climate change, both natural and anthropogenic. About 30% of the glaciers on earth terminate in the ocean and frontal ablation (mass loss by calving and frontal melting) is a major component of the mass budget of tidewater glaciers, strongly affecting their dynamics. Most global scale ice volume estimates to date still suffer from considerable uncertainties related to i) the implemented frontal ablation parameterization or ii) not accounting for frontal ablation at all in the glacier model. To improve estimates of the ice thickness distribution of tidewater glaciers, it is thus important to identify and test low-cost and robust parameterizations of this process. By implementing such parameterization into the ice-thickness estimation module of the Open Global Glacier Model (OGGM v1.1.2), this thesis conducts a first assessment of the impact of accounting for frontal ablation on the estimate of ice stored in glaciers located in Alaska and Greenland. OGGM is the first globally applicable, open source, community-driven model for consistently simulating past and future global scale glacier change. It's ice thickness inversion scheme relies on a mass-conservation approach, this thesis found that if frontal ablation is neglected from the mass balance budget, the model systematically underestimated the mass turnover, and therefore the thickness and volume of tidewater glaciers. This underestimation can amount to up to 19% on a regional ... |
author2 |
Marzeion, Ben McNabb, Robert |
format |
Doctoral or Postdoctoral Thesis |
author |
Recinos, Beatriz |
author_facet |
Recinos, Beatriz |
author_sort |
Recinos, Beatriz |
title |
Ocean-glacier interaction on the large regional scale |
title_short |
Ocean-glacier interaction on the large regional scale |
title_full |
Ocean-glacier interaction on the large regional scale |
title_fullStr |
Ocean-glacier interaction on the large regional scale |
title_full_unstemmed |
Ocean-glacier interaction on the large regional scale |
title_sort |
ocean-glacier interaction on the large regional scale |
publisher |
Universität Bremen |
publishDate |
2020 |
url |
https://media.suub.uni-bremen.de/handle/elib/4637 https://doi.org/10.26092/elib/434 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib46378 |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic glacier glacier glaciers Greenland Tidewater Alaska |
genre_facet |
Antarc* Antarctic glacier glacier glaciers Greenland Tidewater Alaska |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/4637 http://dx.doi.org/10.26092/elib/434 doi:10.26092/elib/434 urn:nbn:de:gbv:46-elib46378 |
op_rights |
info:eu-repo/semantics/openAccess Attribution 3.0 Germany http://creativecommons.org/licenses/by/3.0/de/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.26092/elib/434 |
_version_ |
1766168781260849152 |