Ice discharge error estimates using different cross-sectional area approaches: a case study for the Canadian High Arctic, 2016/17
ABSTRACT We analyse the various error sources in the estimation of ice discharge through flux gates, distinguishing the cases with ice-thickness data available for glacier cross-sections or only along the centreline. For the latter, we analyse the performance of three U-shaped cross-sectional approa...
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crcambridgeupr:10.1017/jog.2018.48 2024-03-03T08:41:46+00:00 Ice discharge error estimates using different cross-sectional area approaches: a case study for the Canadian High Arctic, 2016/17 SÁNCHEZ-GÁMEZ, PABLO NAVARRO, FRANCISCO J. 2018 http://dx.doi.org/10.1017/jog.2018.48 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000485 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 64, issue 246, page 595-608 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2018 crcambridgeupr https://doi.org/10.1017/jog.2018.48 2024-02-08T08:33:26Z ABSTRACT We analyse the various error sources in the estimation of ice discharge through flux gates, distinguishing the cases with ice-thickness data available for glacier cross-sections or only along the centreline. For the latter, we analyse the performance of three U-shaped cross-sectional approaches. We apply this methodology to glaciers of the Canadian High Arctic. The velocity field is the main error source for small and medium-size glaciers (discharge <100 Mt a −1 ) with low velocities (<100 m a −1 ), while for large glaciers (discharge >100 Mt a −1 ) with high velocities (>100 m a −1 ) the error in cross-sectional area dominates. Thinning/thickening between ice-thickness and velocity measurements should be considered, as it implies systematic errors up to 8% in our study. The U-shaped parabolic approach, which allows for an adjusted estimation when the ice-thickness measurement point is displaced from the glacier centreline, performs best, with small bias and admissible standard error. We observe an increase of ice discharge from the main glaciers (Trinity and Wykeham) of the Prince of Wales Icefield from 2015 to 2016, by 5 and 20%, respectively, followed by a decrease in 2017, by 10 and 15%, respectively. Belcher Glacier, of the Devon Ice Cap, maintains similar discharges during 2015–17. Article in Journal/Newspaper Arctic Ice cap Journal of Glaciology Cambridge University Press Arctic Belcher ENVELOPE(-94.172,-94.172,57.936,57.936) Devon Ice Cap ENVELOPE(-82.499,-82.499,75.335,75.335) Belcher Glacier ENVELOPE(-81.354,-81.354,75.682,75.682) Prince of Wales Icefield ENVELOPE(-78.998,-78.998,78.252,78.252) Journal of Glaciology 64 246 595 608 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes SÁNCHEZ-GÁMEZ, PABLO NAVARRO, FRANCISCO J. Ice discharge error estimates using different cross-sectional area approaches: a case study for the Canadian High Arctic, 2016/17 |
topic_facet |
Earth-Surface Processes |
description |
ABSTRACT We analyse the various error sources in the estimation of ice discharge through flux gates, distinguishing the cases with ice-thickness data available for glacier cross-sections or only along the centreline. For the latter, we analyse the performance of three U-shaped cross-sectional approaches. We apply this methodology to glaciers of the Canadian High Arctic. The velocity field is the main error source for small and medium-size glaciers (discharge <100 Mt a −1 ) with low velocities (<100 m a −1 ), while for large glaciers (discharge >100 Mt a −1 ) with high velocities (>100 m a −1 ) the error in cross-sectional area dominates. Thinning/thickening between ice-thickness and velocity measurements should be considered, as it implies systematic errors up to 8% in our study. The U-shaped parabolic approach, which allows for an adjusted estimation when the ice-thickness measurement point is displaced from the glacier centreline, performs best, with small bias and admissible standard error. We observe an increase of ice discharge from the main glaciers (Trinity and Wykeham) of the Prince of Wales Icefield from 2015 to 2016, by 5 and 20%, respectively, followed by a decrease in 2017, by 10 and 15%, respectively. Belcher Glacier, of the Devon Ice Cap, maintains similar discharges during 2015–17. |
format |
Article in Journal/Newspaper |
author |
SÁNCHEZ-GÁMEZ, PABLO NAVARRO, FRANCISCO J. |
author_facet |
SÁNCHEZ-GÁMEZ, PABLO NAVARRO, FRANCISCO J. |
author_sort |
SÁNCHEZ-GÁMEZ, PABLO |
title |
Ice discharge error estimates using different cross-sectional area approaches: a case study for the Canadian High Arctic, 2016/17 |
title_short |
Ice discharge error estimates using different cross-sectional area approaches: a case study for the Canadian High Arctic, 2016/17 |
title_full |
Ice discharge error estimates using different cross-sectional area approaches: a case study for the Canadian High Arctic, 2016/17 |
title_fullStr |
Ice discharge error estimates using different cross-sectional area approaches: a case study for the Canadian High Arctic, 2016/17 |
title_full_unstemmed |
Ice discharge error estimates using different cross-sectional area approaches: a case study for the Canadian High Arctic, 2016/17 |
title_sort |
ice discharge error estimates using different cross-sectional area approaches: a case study for the canadian high arctic, 2016/17 |
publisher |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1017/jog.2018.48 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000485 |
long_lat |
ENVELOPE(-94.172,-94.172,57.936,57.936) ENVELOPE(-82.499,-82.499,75.335,75.335) ENVELOPE(-81.354,-81.354,75.682,75.682) ENVELOPE(-78.998,-78.998,78.252,78.252) |
geographic |
Arctic Belcher Devon Ice Cap Belcher Glacier Prince of Wales Icefield |
geographic_facet |
Arctic Belcher Devon Ice Cap Belcher Glacier Prince of Wales Icefield |
genre |
Arctic Ice cap Journal of Glaciology |
genre_facet |
Arctic Ice cap Journal of Glaciology |
op_source |
Journal of Glaciology volume 64, issue 246, page 595-608 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2018.48 |
container_title |
Journal of Glaciology |
container_volume |
64 |
container_issue |
246 |
container_start_page |
595 |
op_container_end_page |
608 |
_version_ |
1792497375704514560 |