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...
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ftloughboroughun:oai:figshare.com:article/9483992 2023-05-15T15:00:41+02:00 Drainage-system development in consecutive melt seasons at a polythermal, Arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation Richard Hodgkins Richard Cooper Martyn Tranter Jemma Wadham 2013-07-26T00:00:00Z https://figshare.com/articles/journal_contribution/Drainage-system_development_in_consecutive_melt_seasons_at_a_polythermal_Arctic_glacier_evaluated_by_flow-recession_analysis_and_linear-reservoir_simulation/9483992 unknown 2134/12123 https://figshare.com/articles/journal_contribution/Drainage-system_development_in_consecutive_melt_seasons_at_a_polythermal_Arctic_glacier_evaluated_by_flow-recession_analysis_and_linear-reservoir_simulation/9483992 CC BY 3.0 CC-BY Earth Sciences not elsewhere classified Glacier Arctic Drainage Polythermal Recession Reservoir Text Journal contribution 2013 ftloughboroughun 2022-01-01T19:18:20Z 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 h (1999) to 41 h (2000), and mean coefficients of an intermittent, slow reservoir varying from 54 h (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 sub-seasonal 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 co-exist spatially and temporally at polythermal glaciers. Other Non-Article Part of Journal/Newspaper Arctic glacier Svalbard Loughborough University: Figshare Arctic Finsterwalderbreen ENVELOPE(15.273,15.273,77.489,77.489) Svalbard |
institution |
Open Polar |
collection |
Loughborough University: Figshare |
op_collection_id |
ftloughboroughun |
language |
unknown |
topic |
Earth Sciences not elsewhere classified Glacier Arctic Drainage Polythermal Recession Reservoir |
spellingShingle |
Earth Sciences not elsewhere classified Glacier Arctic Drainage Polythermal Recession Reservoir Richard Hodgkins Richard Cooper Martyn Tranter Jemma Wadham Drainage-system development in consecutive melt seasons at a polythermal, Arctic glacier, evaluated by flow-recession analysis and linear-reservoir simulation |
topic_facet |
Earth Sciences not elsewhere classified Glacier Arctic Drainage 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 h (1999) to 41 h (2000), and mean coefficients of an intermittent, slow reservoir varying from 54 h (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 sub-seasonal 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 co-exist spatially and temporally at polythermal glaciers. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Richard Hodgkins Richard Cooper Martyn Tranter Jemma Wadham |
author_facet |
Richard Hodgkins Richard Cooper Martyn Tranter Jemma Wadham |
author_sort |
Richard Hodgkins |
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://figshare.com/articles/journal_contribution/Drainage-system_development_in_consecutive_melt_seasons_at_a_polythermal_Arctic_glacier_evaluated_by_flow-recession_analysis_and_linear-reservoir_simulation/9483992 |
long_lat |
ENVELOPE(15.273,15.273,77.489,77.489) |
geographic |
Arctic Finsterwalderbreen Svalbard |
geographic_facet |
Arctic Finsterwalderbreen Svalbard |
genre |
Arctic glacier Svalbard |
genre_facet |
Arctic glacier Svalbard |
op_relation |
2134/12123 https://figshare.com/articles/journal_contribution/Drainage-system_development_in_consecutive_melt_seasons_at_a_polythermal_Arctic_glacier_evaluated_by_flow-recession_analysis_and_linear-reservoir_simulation/9483992 |
op_rights |
CC BY 3.0 |
op_rightsnorm |
CC-BY |
_version_ |
1766332759081484288 |