Time‐lapse photogrammetry reveals hydrological controls of fine‐scale High‐Arctic glacier surface roughness evolution
Abstract In a warming Arctic, as glacier snowlines rise, short‐ to medium‐term increases in seasonal bare‐ice extent are forecast for the next few decades. These changes will enhance the importance of turbulent energy fluxes for surface ablation and glacier mass balance. Turbulent energy exchanges a...
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crwiley:10.1002/esp.5339 2024-04-28T07:53:43+00:00 Time‐lapse photogrammetry reveals hydrological controls of fine‐scale High‐Arctic glacier surface roughness evolution Irvine‐Fynn, Tristram D. L. Holt, Tom O. James, Timothy D. Smith, Mark W. Rutter, Nick Porter, Philip R. Hodson, Andrew J. Royal Geographical Society Leverhulme Trust 2022 http://dx.doi.org/10.1002/esp.5339 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.5339 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/esp.5339 en eng Wiley http://creativecommons.org/licenses/by-nc/4.0/ Earth Surface Processes and Landforms volume 47, issue 6, page 1635-1652 ISSN 0197-9337 1096-9837 Earth and Planetary Sciences (miscellaneous) Earth-Surface Processes Geography, Planning and Development journal-article 2022 crwiley https://doi.org/10.1002/esp.5339 2024-04-05T07:41:29Z Abstract In a warming Arctic, as glacier snowlines rise, short‐ to medium‐term increases in seasonal bare‐ice extent are forecast for the next few decades. These changes will enhance the importance of turbulent energy fluxes for surface ablation and glacier mass balance. Turbulent energy exchanges at the ice surface are conditioned by its topography, or roughness, which has been hypothesized to be controlled by supraglacial hydrology at the glacier scale. However, current understanding of the dynamics in surface topography, and the role of drainage development, remains incomplete, particularly for the transition between seasonal snow cover and well‐developed, weathered bare‐ice. Using time‐lapse photogrammetry, we report a daily timeseries of fine (millimetre)‐scale supraglacial topography at a 2 m 2 plot on the Lower Foxfonna glacier, Svalbard, over two 9‐day periods in 2011. We show traditional kernel‐based morphometric descriptions of roughness were ineffective in describing temporal change, but indicated fine‐scale albedo feedbacks at depths of ~60 mm contributed to conditioning surface topography. We found profile‐based and two‐dimensional estimates of roughness revealed temporal change, and the aerodynamic roughness parameter, z 0 , showed a 22–32% decrease from ~1 mm following the exposure of bare‐ice, and a subsequent 72–77% increase. Using geostatistical techniques, we identified ‘hole effect’ properties in the surface elevation semivariograms, and demonstrated that hydrological drivers control the plot‐scale topography: degradation of superimposed ice reduces roughness while the inception of braided rills initiates a subsequent development and amplification of topography. Our study presents an analytical framework for future studies that interrogate the coupling between ice surface roughness and hydro‐meteorological variables and seek to improve parameterizations of topographically evolving bare‐ice areas. Article in Journal/Newspaper albedo Arctic glacier Svalbard Wiley Online Library Earth Surface Processes and Landforms |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
topic |
Earth and Planetary Sciences (miscellaneous) Earth-Surface Processes Geography, Planning and Development |
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Earth and Planetary Sciences (miscellaneous) Earth-Surface Processes Geography, Planning and Development Irvine‐Fynn, Tristram D. L. Holt, Tom O. James, Timothy D. Smith, Mark W. Rutter, Nick Porter, Philip R. Hodson, Andrew J. Time‐lapse photogrammetry reveals hydrological controls of fine‐scale High‐Arctic glacier surface roughness evolution |
topic_facet |
Earth and Planetary Sciences (miscellaneous) Earth-Surface Processes Geography, Planning and Development |
description |
Abstract In a warming Arctic, as glacier snowlines rise, short‐ to medium‐term increases in seasonal bare‐ice extent are forecast for the next few decades. These changes will enhance the importance of turbulent energy fluxes for surface ablation and glacier mass balance. Turbulent energy exchanges at the ice surface are conditioned by its topography, or roughness, which has been hypothesized to be controlled by supraglacial hydrology at the glacier scale. However, current understanding of the dynamics in surface topography, and the role of drainage development, remains incomplete, particularly for the transition between seasonal snow cover and well‐developed, weathered bare‐ice. Using time‐lapse photogrammetry, we report a daily timeseries of fine (millimetre)‐scale supraglacial topography at a 2 m 2 plot on the Lower Foxfonna glacier, Svalbard, over two 9‐day periods in 2011. We show traditional kernel‐based morphometric descriptions of roughness were ineffective in describing temporal change, but indicated fine‐scale albedo feedbacks at depths of ~60 mm contributed to conditioning surface topography. We found profile‐based and two‐dimensional estimates of roughness revealed temporal change, and the aerodynamic roughness parameter, z 0 , showed a 22–32% decrease from ~1 mm following the exposure of bare‐ice, and a subsequent 72–77% increase. Using geostatistical techniques, we identified ‘hole effect’ properties in the surface elevation semivariograms, and demonstrated that hydrological drivers control the plot‐scale topography: degradation of superimposed ice reduces roughness while the inception of braided rills initiates a subsequent development and amplification of topography. Our study presents an analytical framework for future studies that interrogate the coupling between ice surface roughness and hydro‐meteorological variables and seek to improve parameterizations of topographically evolving bare‐ice areas. |
author2 |
Royal Geographical Society Leverhulme Trust |
format |
Article in Journal/Newspaper |
author |
Irvine‐Fynn, Tristram D. L. Holt, Tom O. James, Timothy D. Smith, Mark W. Rutter, Nick Porter, Philip R. Hodson, Andrew J. |
author_facet |
Irvine‐Fynn, Tristram D. L. Holt, Tom O. James, Timothy D. Smith, Mark W. Rutter, Nick Porter, Philip R. Hodson, Andrew J. |
author_sort |
Irvine‐Fynn, Tristram D. L. |
title |
Time‐lapse photogrammetry reveals hydrological controls of fine‐scale High‐Arctic glacier surface roughness evolution |
title_short |
Time‐lapse photogrammetry reveals hydrological controls of fine‐scale High‐Arctic glacier surface roughness evolution |
title_full |
Time‐lapse photogrammetry reveals hydrological controls of fine‐scale High‐Arctic glacier surface roughness evolution |
title_fullStr |
Time‐lapse photogrammetry reveals hydrological controls of fine‐scale High‐Arctic glacier surface roughness evolution |
title_full_unstemmed |
Time‐lapse photogrammetry reveals hydrological controls of fine‐scale High‐Arctic glacier surface roughness evolution |
title_sort |
time‐lapse photogrammetry reveals hydrological controls of fine‐scale high‐arctic glacier surface roughness evolution |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1002/esp.5339 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.5339 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/esp.5339 |
genre |
albedo Arctic glacier Svalbard |
genre_facet |
albedo Arctic glacier Svalbard |
op_source |
Earth Surface Processes and Landforms volume 47, issue 6, page 1635-1652 ISSN 0197-9337 1096-9837 |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1002/esp.5339 |
container_title |
Earth Surface Processes and Landforms |
_version_ |
1797573021909647360 |