A 20-year study of melt processes over Larsen C Ice Shelf using a high-resolution regional atmospheric model: Part 1, Model configuration and validation

Gilbert, Ella M. K., Orr, Andrew, King, John C., Renfrew, Ian A. ORCID: https://orcid.org/0000-0001-9379-8215 and Lachlan-Cope, Tom A. (2022) A 20-year study of melt processes over Larsen C Ice Shelf using a high-resolution regional atmospheric model: Part 1, Model configuration and validation. Journal of Geophysical Research: Atmospheres, 127 (8). ISSN 2169-897X

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Abstract

Following collapses of the neighboring Larsen A and B ice shelves, Larsen C has become a focus of increased attention. Determining how the prevailing meteorological conditions influence its surface melt regime is of paramount importance for understanding the dominant processes causing melt and ultimately for predicting its future. To this end, a new, high-resolution (4 km grid spacing) Met Office Unified Model (MetUM) hindcast of atmospheric conditions and surface melt processes over the central Antarctic Peninsula is introduced. The hindcast is capable of simulating observed near-surface meteorology and surface melt conditions over Larsen C. In contrast with previous model simulations, the MetUM captures the observed east-west gradient in surface melting associated with foehn winds, as well as the interannual variability in melt shown in previous observational studies. As exemplars, we focus on two case studies—the months preceding the collapse of the Larsen B ice shelf in March 2002 and the high foehn, high melt period of March-May 2016—to test the hindcast's ability to reproduce the atmospheric effects that contributed to considerable melting during those periods. The results suggest that the MetUM hindcast is a useful tool with which to explore the dominant causes of surface melting on Larsen C.

Item Type: Article
Additional Information: This work was supported by the Natural Environment Research Council through the EnvEast Doctoral Training Partnership (grant number NE/L002582/1). Hindcast model data can be accessed on the CEDA archive at https://catalogue.ceda.ac.uk/uuid/41c879b06af642e9bc8e12d1d0ea3d62 and can be cited as Gilbert, E. (2020): High-resolution regional Met Office Unified Model (UM) climate model hindcast of the Antarctic Peninsula (1998-2017). Centre for Environmental Data Analysis, date of citation. AWS data can be retrieved from https://www.projects.science.uu.nl/iceclimate/aws/.
Uncontrolled Keywords: antarctic peninsula,ice shelves,meteorology,model hindcast,regional climate modeling,surface melt,atmospheric science,geophysics,earth and planetary sciences (miscellaneous),space and planetary science ,/dk/atira/pure/subjectarea/asjc/1900/1902
Faculty \ School: Faculty of Science > School of Environmental Sciences
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Depositing User: LivePure Connector
Date Deposited: 29 Oct 2021 00:41
Last Modified: 30 Oct 2022 00:59
URI: https://ueaeprints.uea.ac.uk/id/eprint/81923
DOI: 10.1029/2021JD034766

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