Ice discharge error estimates using different cross-sectional area approaches: a case study for the Canadian High Arctic, 2016/17

Sánchez-Gámez, Pablo and Navarro Valero, Francisco José (2018). Ice discharge error estimates using different cross-sectional area approaches: a case study for the Canadian High Arctic, 2016/17. "Journal of Glaciology", v. 64 (n. 246); pp. 595-608. ISSN 0022-1430. https://doi.org/10.1017/jog.2018.48.

Description

Title: Ice discharge error estimates using different cross-sectional area approaches: a case study for the Canadian High Arctic, 2016/17
Author/s:
  • Sánchez-Gámez, Pablo
  • Navarro Valero, Francisco José
Item Type: Article
Título de Revista/Publicación: Journal of Glaciology
Date: August 2018
ISSN: 0022-1430
Volume: 64
Subjects:
Freetext Keywords: Arctic glaciology; glacier discharge; ice dynamics; remote sensing
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Matemática Aplicada a las Tecnologías de la Información y las Comunicaciones
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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 high velocities (>100 m a−1 ) the error in crosssectional 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.

Funding Projects

TypeCodeAcronymLeaderTitle
Horizon 2020727890INTAROSUnspecifiedIntegrated Arctic observation system
Government of SpainCTM2014-56473-RUnspecifiedUnspecifiedDescarga de masa de los glaciares al océano: mejora de las estimaciones actuales y predicción de aportaciones futuras en un clima cambiante
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