A mass-flux perspective of the tidewater glacier cycle
I explore the tidewater glacier cycle with a 1-D, depth- and width-integrated flow model that includes a mass-flux calving parameterization. The parameterization is developed from mass continuity arguments and relates the calving rate to the terminus velocity and the terminus balance velocity. I exp...
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Language: | English |
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International Glaciological Society
2016
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Online Access: | http://hdl.handle.net/11122/11191 |
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ftunivalaska:oai:scholarworks.alaska.edu:11122/11191 2023-05-15T16:21:14+02:00 A mass-flux perspective of the tidewater glacier cycle Amundson, Jason M. 2016-04-06 http://hdl.handle.net/11122/11191 en_US eng International Glaciological Society Amundson, J. M. (2016), A mass-flux perspective of the tidewater glacier cycle, J. Glaciol., 62(231), 82–93, doi:10.1017/jog.2016.14. http://hdl.handle.net/11122/11191 Journal of Glaciology ice-ocean interactions iceberg calving tidewater glaciers Article 2016 ftunivalaska https://doi.org/10.1017/jog.2016.14 2023-02-23T21:37:38Z I explore the tidewater glacier cycle with a 1-D, depth- and width-integrated flow model that includes a mass-flux calving parameterization. The parameterization is developed from mass continuity arguments and relates the calving rate to the terminus velocity and the terminus balance velocity. I explore the tidewater glacier cycle with a 1-D, depth- and width-integrated flow model that includes a mass-flux calving parameterization. The parameterization is developed from mass continuity arguments and relates the calving rate to the terminus velocity and the terminus balance velocity. The model demonstrates variable sensitivity to climate. From an advanced, stable configuration, a small warming of the climate triggers a rapid retreat that causes large-scale drawdown and is enhanced by positive glacier-dynamic feedbacks. Eventually, the terminus retreats out of deep water and the terminus velocity decreases, resulting in reduced drawdown and the potential for restabilization. Terminus readvance can be initiated by cooling the climate. Terminus advance into deep water is difficult to sustain, however, due to negative feedbacks between glacier dynamics and surface mass balance. Despite uncertainty in the precise form of the parameterization, the model provides a simple explanation of the tidewater glacier cycle and can be used to evaluate the response of tidewater glaciers to climate variability. It also highlights the importance of improving parameterizations of calving rates and of incorporating sediment dynamics into tidewater glacier models. E.M. Enderlin provided model code and assistance during the initial stages of model development. I.M. Howat provided mass-flux data for Greenland outlet glaciers. Funding was provided by the National Oceanic and Atmospheric Association (NA13OAR4310098). This manuscript was greatly benefitted from discussions with M. Truffer and thorough reviews from A. Vieli, an anonymous reviewer and scientific editor H.A. Fricker. Yes Article in Journal/Newspaper glacier Greenland Journal of Glaciology Tidewater University of Alaska: ScholarWorks@UA Fricker ENVELOPE(-65.000,-65.000,-67.050,-67.050) Greenland Journal of Glaciology 62 231 82 93 |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
ice-ocean interactions iceberg calving tidewater glaciers |
spellingShingle |
ice-ocean interactions iceberg calving tidewater glaciers Amundson, Jason M. A mass-flux perspective of the tidewater glacier cycle |
topic_facet |
ice-ocean interactions iceberg calving tidewater glaciers |
description |
I explore the tidewater glacier cycle with a 1-D, depth- and width-integrated flow model that includes a mass-flux calving parameterization. The parameterization is developed from mass continuity arguments and relates the calving rate to the terminus velocity and the terminus balance velocity. I explore the tidewater glacier cycle with a 1-D, depth- and width-integrated flow model that includes a mass-flux calving parameterization. The parameterization is developed from mass continuity arguments and relates the calving rate to the terminus velocity and the terminus balance velocity. The model demonstrates variable sensitivity to climate. From an advanced, stable configuration, a small warming of the climate triggers a rapid retreat that causes large-scale drawdown and is enhanced by positive glacier-dynamic feedbacks. Eventually, the terminus retreats out of deep water and the terminus velocity decreases, resulting in reduced drawdown and the potential for restabilization. Terminus readvance can be initiated by cooling the climate. Terminus advance into deep water is difficult to sustain, however, due to negative feedbacks between glacier dynamics and surface mass balance. Despite uncertainty in the precise form of the parameterization, the model provides a simple explanation of the tidewater glacier cycle and can be used to evaluate the response of tidewater glaciers to climate variability. It also highlights the importance of improving parameterizations of calving rates and of incorporating sediment dynamics into tidewater glacier models. E.M. Enderlin provided model code and assistance during the initial stages of model development. I.M. Howat provided mass-flux data for Greenland outlet glaciers. Funding was provided by the National Oceanic and Atmospheric Association (NA13OAR4310098). This manuscript was greatly benefitted from discussions with M. Truffer and thorough reviews from A. Vieli, an anonymous reviewer and scientific editor H.A. Fricker. Yes |
format |
Article in Journal/Newspaper |
author |
Amundson, Jason M. |
author_facet |
Amundson, Jason M. |
author_sort |
Amundson, Jason M. |
title |
A mass-flux perspective of the tidewater glacier cycle |
title_short |
A mass-flux perspective of the tidewater glacier cycle |
title_full |
A mass-flux perspective of the tidewater glacier cycle |
title_fullStr |
A mass-flux perspective of the tidewater glacier cycle |
title_full_unstemmed |
A mass-flux perspective of the tidewater glacier cycle |
title_sort |
mass-flux perspective of the tidewater glacier cycle |
publisher |
International Glaciological Society |
publishDate |
2016 |
url |
http://hdl.handle.net/11122/11191 |
long_lat |
ENVELOPE(-65.000,-65.000,-67.050,-67.050) |
geographic |
Fricker Greenland |
geographic_facet |
Fricker Greenland |
genre |
glacier Greenland Journal of Glaciology Tidewater |
genre_facet |
glacier Greenland Journal of Glaciology Tidewater |
op_relation |
Amundson, J. M. (2016), A mass-flux perspective of the tidewater glacier cycle, J. Glaciol., 62(231), 82–93, doi:10.1017/jog.2016.14. http://hdl.handle.net/11122/11191 Journal of Glaciology |
op_doi |
https://doi.org/10.1017/jog.2016.14 |
container_title |
Journal of Glaciology |
container_volume |
62 |
container_issue |
231 |
container_start_page |
82 |
op_container_end_page |
93 |
_version_ |
1766009249281867776 |