The Hydrologic Evolution of Glacial Meltwater: Insights and Implications from Alpine and Arctic Glaciers.
Glaciers are of critical importance in the global hydrological cycle and the implications of their recent rapid decline are still poorly understood. Subglacial processes impact glacial hydrology through nutrient production, water chemistry, and aquifer recharge, but are inaccessible to direct observ...
Main Author: | |
---|---|
Other Authors: | , , , , |
Format: | Thesis |
Language: | English |
Published: |
2015
|
Subjects: | |
Online Access: | https://hdl.handle.net/2027.42/113348 |
id |
ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/113348 |
---|---|
record_format |
openpolar |
spelling |
ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/113348 2024-01-07T09:41:56+01:00 The Hydrologic Evolution of Glacial Meltwater: Insights and Implications from Alpine and Arctic Glaciers. Arendt, Carli Anne Aciego, Sarah M. Bassis, Jeremy N. Hetland, Eric A. Lohmann, Kyger C. Cruz Da Silvo Castro, Maria C. 2015 application/pdf https://hdl.handle.net/2027.42/113348 en_US eng https://hdl.handle.net/2027.42/113348 Glacial hydrology Isotope geochemistry Bayesian Monte Carlo isotope mixing model Glacial-interglacial timescales Subglacial environment Meltwater residence time Geology and Earth Sciences Science Thesis 2015 ftumdeepblue 2023-12-10T17:38:24Z Glaciers are of critical importance in the global hydrological cycle and the implications of their recent rapid decline are still poorly understood. Subglacial processes impact glacial hydrology through nutrient production, water chemistry, and aquifer recharge, but are inaccessible to direct observation. Furthermore, understanding the impact current subglacial melt processes have on surrounding environments may provide insight to changes that likely occurred on glacial-interglacial timescales. In my work, I combine multiple elemental and isotopic systems to understand glacial hydrology, including the subglacial environment. First, I have developed a Bayesian Monte Carlo isotope-mixing model that incorporates stable isotope, δ18O and δD, measurements to extrapolate relative contributions of ice and snowmelt to the glacial system. This model can also be applied to other earth surface systems with distinct end member isotopic compositions. Second, I have combined the melt fractions from my isotope-mixing model with a radioactive uranium-series (U-series) isotope age model to quantify the average residence time and storage length of subglacial melt. By combining these two isotopic systems, I provide unique insights on the size of the subglacial meltwater reservoir and its potential impacts on glacial sliding and meltwater nutrients. Third, I investigate the influence of the U chemistry of current glacial meltwater from the Greenland Ice Sheet on adjacent seawater as a proxy to reconstruct the potential influence of glacial melt on global seawater U chemistry over glacial-interglacial timescales using a simple seawater U budget box model. The models presented here are applied to a broad geographic range to investigate the universality of climate-melt relationships and the impact of glacial melt on the chemistry of both freshwater and seawater reservoirs. PhD Earth and Environmental Sciences University of Michigan, Horace H. Rackham School of Graduate Studies ... Thesis Arctic Greenland Ice Sheet University of Michigan: Deep Blue Arctic Greenland |
institution |
Open Polar |
collection |
University of Michigan: Deep Blue |
op_collection_id |
ftumdeepblue |
language |
English |
topic |
Glacial hydrology Isotope geochemistry Bayesian Monte Carlo isotope mixing model Glacial-interglacial timescales Subglacial environment Meltwater residence time Geology and Earth Sciences Science |
spellingShingle |
Glacial hydrology Isotope geochemistry Bayesian Monte Carlo isotope mixing model Glacial-interglacial timescales Subglacial environment Meltwater residence time Geology and Earth Sciences Science Arendt, Carli Anne The Hydrologic Evolution of Glacial Meltwater: Insights and Implications from Alpine and Arctic Glaciers. |
topic_facet |
Glacial hydrology Isotope geochemistry Bayesian Monte Carlo isotope mixing model Glacial-interglacial timescales Subglacial environment Meltwater residence time Geology and Earth Sciences Science |
description |
Glaciers are of critical importance in the global hydrological cycle and the implications of their recent rapid decline are still poorly understood. Subglacial processes impact glacial hydrology through nutrient production, water chemistry, and aquifer recharge, but are inaccessible to direct observation. Furthermore, understanding the impact current subglacial melt processes have on surrounding environments may provide insight to changes that likely occurred on glacial-interglacial timescales. In my work, I combine multiple elemental and isotopic systems to understand glacial hydrology, including the subglacial environment. First, I have developed a Bayesian Monte Carlo isotope-mixing model that incorporates stable isotope, δ18O and δD, measurements to extrapolate relative contributions of ice and snowmelt to the glacial system. This model can also be applied to other earth surface systems with distinct end member isotopic compositions. Second, I have combined the melt fractions from my isotope-mixing model with a radioactive uranium-series (U-series) isotope age model to quantify the average residence time and storage length of subglacial melt. By combining these two isotopic systems, I provide unique insights on the size of the subglacial meltwater reservoir and its potential impacts on glacial sliding and meltwater nutrients. Third, I investigate the influence of the U chemistry of current glacial meltwater from the Greenland Ice Sheet on adjacent seawater as a proxy to reconstruct the potential influence of glacial melt on global seawater U chemistry over glacial-interglacial timescales using a simple seawater U budget box model. The models presented here are applied to a broad geographic range to investigate the universality of climate-melt relationships and the impact of glacial melt on the chemistry of both freshwater and seawater reservoirs. PhD Earth and Environmental Sciences University of Michigan, Horace H. Rackham School of Graduate Studies ... |
author2 |
Aciego, Sarah M. Bassis, Jeremy N. Hetland, Eric A. Lohmann, Kyger C. Cruz Da Silvo Castro, Maria C. |
format |
Thesis |
author |
Arendt, Carli Anne |
author_facet |
Arendt, Carli Anne |
author_sort |
Arendt, Carli Anne |
title |
The Hydrologic Evolution of Glacial Meltwater: Insights and Implications from Alpine and Arctic Glaciers. |
title_short |
The Hydrologic Evolution of Glacial Meltwater: Insights and Implications from Alpine and Arctic Glaciers. |
title_full |
The Hydrologic Evolution of Glacial Meltwater: Insights and Implications from Alpine and Arctic Glaciers. |
title_fullStr |
The Hydrologic Evolution of Glacial Meltwater: Insights and Implications from Alpine and Arctic Glaciers. |
title_full_unstemmed |
The Hydrologic Evolution of Glacial Meltwater: Insights and Implications from Alpine and Arctic Glaciers. |
title_sort |
hydrologic evolution of glacial meltwater: insights and implications from alpine and arctic glaciers. |
publishDate |
2015 |
url |
https://hdl.handle.net/2027.42/113348 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Ice Sheet |
genre_facet |
Arctic Greenland Ice Sheet |
op_relation |
https://hdl.handle.net/2027.42/113348 |
_version_ |
1787422752633782272 |