Drainage-system development in consecutive melt seasons at a polythermal, Arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation
The drainage systems of polythermal glaciers play an important role in high-latitude hydrology, and are determinants of ice flow rate. Flow-recession analysis and linear-reservoir simulation of runoff time series are here used to evaluate seasonal and inter-annual variability in the drainage system...
Published in: | Water Resources Research |
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Language: | English |
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2013
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Online Access: | https://pure.au.dk/portal/da/publications/drainagesystem-development-in-consecutive-melt-seasons-at-a-polythermal-arctic-glacier-evaluated-by-flowrecession-analysis-and-linearreservoir-simulation(1ccbea88-fd81-40e9-b921-226259436b14).html https://doi.org/10.1002/wrcr.20257 |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/1ccbea88-fd81-40e9-b921-226259436b14 2023-05-15T14:25:02+02:00 Drainage-system development in consecutive melt seasons at a polythermal, Arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation Hodgkins, Richard Cooper, Richard Tranter, Martyn Wadham, Jemma 2013 https://pure.au.dk/portal/da/publications/drainagesystem-development-in-consecutive-melt-seasons-at-a-polythermal-arctic-glacier-evaluated-by-flowrecession-analysis-and-linearreservoir-simulation(1ccbea88-fd81-40e9-b921-226259436b14).html https://doi.org/10.1002/wrcr.20257 eng eng info:eu-repo/semantics/restrictedAccess Hodgkins , R , Cooper , R , Tranter , M & Wadham , J 2013 , ' Drainage-system development in consecutive melt seasons at a polythermal, Arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation ' , Water Resources Research , vol. 49 , no. 7 , pp. 4230-4243 . https://doi.org/10.1002/wrcr.20257 Arctic drainage glacier polythermal recession reservoir article 2013 ftuniaarhuspubl https://doi.org/10.1002/wrcr.20257 2022-11-30T23:56:33Z The drainage systems of polythermal glaciers play an important role in high-latitude hydrology, and are determinants of ice flow rate. Flow-recession analysis and linear-reservoir simulation of runoff time series are here used to evaluate seasonal and inter-annual variability in the drainage system of the polythermal Finsterwalderbreen, Svalbard, in 1999 and 2000. Linear-flow recessions are pervasive, with mean coefficients of a fast reservoir varying from 16 (1999) to 41 h (2000), and mean coefficients of an intermittent, slow reservoir varying from 54 (1999) to 114 h (2000). Drainage-system efficiency is greater overall in the first of the two seasons, the simplest explanation of which is more rapid depletion of the snow cover. Reservoir coefficients generally decline during each season (at 0.22 h d -1 in 1999 and 0.52 h d -1 in 2000), denoting an increase in drainage efficiency. However, coefficients do not exhibit a consistent relationship with discharge. Finsterwalderbreen therefore appears to behave as an intermediate case between temperate glaciers and other polythermal glaciers with smaller proportions of temperate ice. Linear-reservoir runoff simulations exhibit limited sensitivity to a relatively wide range of reservoir coefficients, although the use of fixed coefficients in a spatially lumped model can generate significant subseasonal error. At Finsterwalderbreen, an ice-marginal channel with the characteristics of a fast reservoir, and a subglacial upwelling with the characteristics of a slow reservoir, both route meltwater to the terminus. This suggests that drainage-system components of significantly contrasting efficiencies can coexist spatially and temporally at polythermal glaciers. Article in Journal/Newspaper Arctic Arctic glacier Svalbard Aarhus University: Research Arctic Finsterwalderbreen ENVELOPE(15.273,15.273,77.489,77.489) Svalbard Water Resources Research 49 7 4230 4243 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Arctic drainage glacier polythermal recession reservoir |
spellingShingle |
Arctic drainage glacier polythermal recession reservoir Hodgkins, Richard Cooper, Richard Tranter, Martyn Wadham, Jemma Drainage-system development in consecutive melt seasons at a polythermal, Arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation |
topic_facet |
Arctic drainage glacier polythermal recession reservoir |
description |
The drainage systems of polythermal glaciers play an important role in high-latitude hydrology, and are determinants of ice flow rate. Flow-recession analysis and linear-reservoir simulation of runoff time series are here used to evaluate seasonal and inter-annual variability in the drainage system of the polythermal Finsterwalderbreen, Svalbard, in 1999 and 2000. Linear-flow recessions are pervasive, with mean coefficients of a fast reservoir varying from 16 (1999) to 41 h (2000), and mean coefficients of an intermittent, slow reservoir varying from 54 (1999) to 114 h (2000). Drainage-system efficiency is greater overall in the first of the two seasons, the simplest explanation of which is more rapid depletion of the snow cover. Reservoir coefficients generally decline during each season (at 0.22 h d -1 in 1999 and 0.52 h d -1 in 2000), denoting an increase in drainage efficiency. However, coefficients do not exhibit a consistent relationship with discharge. Finsterwalderbreen therefore appears to behave as an intermediate case between temperate glaciers and other polythermal glaciers with smaller proportions of temperate ice. Linear-reservoir runoff simulations exhibit limited sensitivity to a relatively wide range of reservoir coefficients, although the use of fixed coefficients in a spatially lumped model can generate significant subseasonal error. At Finsterwalderbreen, an ice-marginal channel with the characteristics of a fast reservoir, and a subglacial upwelling with the characteristics of a slow reservoir, both route meltwater to the terminus. This suggests that drainage-system components of significantly contrasting efficiencies can coexist spatially and temporally at polythermal glaciers. |
format |
Article in Journal/Newspaper |
author |
Hodgkins, Richard Cooper, Richard Tranter, Martyn Wadham, Jemma |
author_facet |
Hodgkins, Richard Cooper, Richard Tranter, Martyn Wadham, Jemma |
author_sort |
Hodgkins, Richard |
title |
Drainage-system development in consecutive melt seasons at a polythermal, Arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation |
title_short |
Drainage-system development in consecutive melt seasons at a polythermal, Arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation |
title_full |
Drainage-system development in consecutive melt seasons at a polythermal, Arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation |
title_fullStr |
Drainage-system development in consecutive melt seasons at a polythermal, Arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation |
title_full_unstemmed |
Drainage-system development in consecutive melt seasons at a polythermal, Arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation |
title_sort |
drainage-system development in consecutive melt seasons at a polythermal, arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation |
publishDate |
2013 |
url |
https://pure.au.dk/portal/da/publications/drainagesystem-development-in-consecutive-melt-seasons-at-a-polythermal-arctic-glacier-evaluated-by-flowrecession-analysis-and-linearreservoir-simulation(1ccbea88-fd81-40e9-b921-226259436b14).html https://doi.org/10.1002/wrcr.20257 |
long_lat |
ENVELOPE(15.273,15.273,77.489,77.489) |
geographic |
Arctic Finsterwalderbreen Svalbard |
geographic_facet |
Arctic Finsterwalderbreen Svalbard |
genre |
Arctic Arctic glacier Svalbard |
genre_facet |
Arctic Arctic glacier Svalbard |
op_source |
Hodgkins , R , Cooper , R , Tranter , M & Wadham , J 2013 , ' Drainage-system development in consecutive melt seasons at a polythermal, Arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation ' , Water Resources Research , vol. 49 , no. 7 , pp. 4230-4243 . https://doi.org/10.1002/wrcr.20257 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/wrcr.20257 |
container_title |
Water Resources Research |
container_volume |
49 |
container_issue |
7 |
container_start_page |
4230 |
op_container_end_page |
4243 |
_version_ |
1766297462781247488 |