A scale-dependent model to represent changing aerodynamic roughness of ablating glacier ice based on repeat topographic surveys
Turbulent fluxes make a substantial and growing contribution to the energy balance of ice surfaces globally, but are poorly constrained owing to challenges in estimating the aerodynamic roughness length (z0). Here, we used structure from motion (SfM) photogrammetry and terrestrial laser scanning (TL...
Published in: | Journal of Glaciology |
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Language: | English |
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International Glaciological Society
2020
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Online Access: | https://lup.lub.lu.se/record/cc2eb2a5-22ba-4ab5-8661-c0f424405a74 https://doi.org/10.1017/jog.2020.56 |
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ftulundlup:oai:lup.lub.lu.se:cc2eb2a5-22ba-4ab5-8661-c0f424405a74 2023-05-15T16:57:28+02:00 A scale-dependent model to represent changing aerodynamic roughness of ablating glacier ice based on repeat topographic surveys Smith, Thomas Smith, Mark W. Chambers, Joshua R. Sailer, Rudolf Nicholson, Lindsey Mertes, Jordan Quincey, Duncan J. Carrivick, Jonathan L. Stiperski, Ivana 2020-12 https://lup.lub.lu.se/record/cc2eb2a5-22ba-4ab5-8661-c0f424405a74 https://doi.org/10.1017/jog.2020.56 eng eng International Glaciological Society https://lup.lub.lu.se/record/cc2eb2a5-22ba-4ab5-8661-c0f424405a74 http://dx.doi.org/10.1017/jog.2020.56 scopus:85089751830 Journal of Glaciology; 66(260), pp 950-964 (2020) ISSN: 0022-1430 Oceanography Hydrology Water Resources Energy balance modelling glacier melt ice roughness structure from motion photogrammetry contributiontojournal/systematicreview info:eu-repo/semantics/article text 2020 ftulundlup https://doi.org/10.1017/jog.2020.56 2023-02-01T23:40:08Z Turbulent fluxes make a substantial and growing contribution to the energy balance of ice surfaces globally, but are poorly constrained owing to challenges in estimating the aerodynamic roughness length (z0). Here, we used structure from motion (SfM) photogrammetry and terrestrial laser scanning (TLS) surveys to make plot-scale 2-D and 3-D microtopographic estimations of z0 and upscale these to map z0 across an ablating mountain glacier. At plot scales, we found spatial variability in z0 estimates of over two orders of magnitude with unpredictable z0 trajectories, even when classified into ice surface types. TLS-derived surface roughness exhibited strong relationships with plot-scale SfM z0 estimates. At the glacier scale, a consistent increase in z0 of ∼0.1 mm d-1 was observed. Space-for-time substitution based on time since surface ice was exposed by snow melt confirmed this gradual increase in z0 over 60 d. These measurements permit us to propose a scale-dependent temporal z0 evolution model where unpredictable variability at the plot scale gives way to more predictable changes of z0 at the glacier scale. This model provides a critical step towards deriving spatially and temporally distributed representations of z0 that are currently lacking in the parameterisation of distributed glacier surface energy balance models. Article in Journal/Newspaper Journal of Glaciology Lund University Publications (LUP) Journal of Glaciology 66 260 950 964 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Oceanography Hydrology Water Resources Energy balance modelling glacier melt ice roughness structure from motion photogrammetry |
spellingShingle |
Oceanography Hydrology Water Resources Energy balance modelling glacier melt ice roughness structure from motion photogrammetry Smith, Thomas Smith, Mark W. Chambers, Joshua R. Sailer, Rudolf Nicholson, Lindsey Mertes, Jordan Quincey, Duncan J. Carrivick, Jonathan L. Stiperski, Ivana A scale-dependent model to represent changing aerodynamic roughness of ablating glacier ice based on repeat topographic surveys |
topic_facet |
Oceanography Hydrology Water Resources Energy balance modelling glacier melt ice roughness structure from motion photogrammetry |
description |
Turbulent fluxes make a substantial and growing contribution to the energy balance of ice surfaces globally, but are poorly constrained owing to challenges in estimating the aerodynamic roughness length (z0). Here, we used structure from motion (SfM) photogrammetry and terrestrial laser scanning (TLS) surveys to make plot-scale 2-D and 3-D microtopographic estimations of z0 and upscale these to map z0 across an ablating mountain glacier. At plot scales, we found spatial variability in z0 estimates of over two orders of magnitude with unpredictable z0 trajectories, even when classified into ice surface types. TLS-derived surface roughness exhibited strong relationships with plot-scale SfM z0 estimates. At the glacier scale, a consistent increase in z0 of ∼0.1 mm d-1 was observed. Space-for-time substitution based on time since surface ice was exposed by snow melt confirmed this gradual increase in z0 over 60 d. These measurements permit us to propose a scale-dependent temporal z0 evolution model where unpredictable variability at the plot scale gives way to more predictable changes of z0 at the glacier scale. This model provides a critical step towards deriving spatially and temporally distributed representations of z0 that are currently lacking in the parameterisation of distributed glacier surface energy balance models. |
format |
Article in Journal/Newspaper |
author |
Smith, Thomas Smith, Mark W. Chambers, Joshua R. Sailer, Rudolf Nicholson, Lindsey Mertes, Jordan Quincey, Duncan J. Carrivick, Jonathan L. Stiperski, Ivana |
author_facet |
Smith, Thomas Smith, Mark W. Chambers, Joshua R. Sailer, Rudolf Nicholson, Lindsey Mertes, Jordan Quincey, Duncan J. Carrivick, Jonathan L. Stiperski, Ivana |
author_sort |
Smith, Thomas |
title |
A scale-dependent model to represent changing aerodynamic roughness of ablating glacier ice based on repeat topographic surveys |
title_short |
A scale-dependent model to represent changing aerodynamic roughness of ablating glacier ice based on repeat topographic surveys |
title_full |
A scale-dependent model to represent changing aerodynamic roughness of ablating glacier ice based on repeat topographic surveys |
title_fullStr |
A scale-dependent model to represent changing aerodynamic roughness of ablating glacier ice based on repeat topographic surveys |
title_full_unstemmed |
A scale-dependent model to represent changing aerodynamic roughness of ablating glacier ice based on repeat topographic surveys |
title_sort |
scale-dependent model to represent changing aerodynamic roughness of ablating glacier ice based on repeat topographic surveys |
publisher |
International Glaciological Society |
publishDate |
2020 |
url |
https://lup.lub.lu.se/record/cc2eb2a5-22ba-4ab5-8661-c0f424405a74 https://doi.org/10.1017/jog.2020.56 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology; 66(260), pp 950-964 (2020) ISSN: 0022-1430 |
op_relation |
https://lup.lub.lu.se/record/cc2eb2a5-22ba-4ab5-8661-c0f424405a74 http://dx.doi.org/10.1017/jog.2020.56 scopus:85089751830 |
op_doi |
https://doi.org/10.1017/jog.2020.56 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
260 |
container_start_page |
950 |
op_container_end_page |
964 |
_version_ |
1766049027724410880 |