A two-dimensional glacier-fjord coupled model applied to estimate submarine melt rates and front position changes of Hansbreen, Svalbard

Andrés Marruedo, Eva de and Otero García, Jaime and Navarro Valero, Francisco Jose and Prominska, Agnieszka and Lapazaran Izargain, Javier Jesus and Walczowski, Waldemar (2018). A two-dimensional glacier-fjord coupled model applied to estimate submarine melt rates and front position changes of Hansbreen, Svalbard. "Journal of Glaciology", v. 64 (n. 247); pp. 745-758. ISSN 0022-1430. https://doi.org/10.1017/jog.2018.61.

Description

Title: A two-dimensional glacier-fjord coupled model applied to estimate submarine melt rates and front position changes of Hansbreen, Svalbard
Author/s:
  • Andrés Marruedo, Eva de
  • Otero García, Jaime
  • Navarro Valero, Francisco Jose
  • Prominska, Agnieszka
  • Lapazaran Izargain, Javier Jesus
  • Walczowski, Waldemar
Item Type: Article
Título de Revista/Publicación: Journal of Glaciology
Date: 2018
ISSN: 0022-1430
Volume: 64
Subjects:
Freetext Keywords: glacier ablation phenomena, glacier calving, glacier modeling, ice/ocean interactions
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 have developed a two-dimensional coupled glacier–fjord model, which runs automatically using Elmer/Ice and MITgcm software packages, to investigate the magnitude of submarine melting along a vertical glacier front and its potential influence on glacier calving and front position changes. We apply this model to simulate the Hansbreen glacier–Hansbukta proglacial–fjord system, Southwestern Svalbard, during the summer of 2010. The limited size of this system allows us to resolve some of the small-scale processes occurring at the ice–ocean interface in the fjord model, using a 0.5 s time step and a 1 m grid resolution near the glacier front. We use a rich set of field data spanning the period April–August 2010 to constrain, calibrate and validate the model. We adjust circulation patterns in the fjord by tuning subglacial discharge inputs that best match observed temperature while maintaining a compromise with observed salinity, suggesting a convectively driven circulation in Hansbukta. The results of our model simulations suggest that both submarine melting and crevasse hydrofracturing exert important controls on seasonal frontal ablation, with submarine melting alone not being sufficient for reproducing the observed patterns of seasonal retreat. Both submarine melt and calving rates accumulated along the entire simulation period are of the same order of magnitude, ∼100 m. The model results also indicate that changes in submarine melting lag meltwater production by 4–5 weeks, which suggests that it may take up to a month for meltwater to traverse the englacial and subglacial drainage network.

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
Government of SpainCTM2017-84441-RUnspecifiedUnspecifiedInteracción termomecánica glaciar-océano: estimación de las pérdidas de masa glaciar por ablación frontal y su fraccionamiento en descarga de icebergs y fusión submarina
Government of SpainFPU-14/01409UnspecifiedUnspecifiedUnspecified

More information

Item ID: 54862
DC Identifier: http://oa.upm.es/54862/
OAI Identifier: oai:oa.upm.es:54862
DOI: 10.1017/jog.2018.61
Official URL: https://www.researchgate.net/publication/327893635_A_two-dimensional_glacier-fjord_coupled_model_applied_to_estimate_submarine_melt_rates_and_front_position_changes_of_Hansbreen_Svalbard
Deposited by: Memoria Investigacion
Deposited on: 06 May 2019 16:17
Last Modified: 06 May 2019 16:17
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