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Atmosphere 2018, 9(5), 172; https://doi.org/10.3390/atmos9050172

A Multidecadal Analysis of Föhn Winds over Larsen C Ice Shelf from a Combination of Observations and Modeling

Institute for Marine and Atmospheric Research, Utrecht University, 3508 TA Utrecht, The Netherlands
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Received: 3 April 2018 / Revised: 25 April 2018 / Accepted: 2 May 2018 / Published: 5 May 2018
(This article belongs to the Special Issue Cryosphere in and around Regional Climate Models)
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Abstract

The southward progression of ice shelf collapse in the Antarctic Peninsula is partially attributed to a strengthening of the circumpolar westerlies and the associated increase in föhn conditions over its eastern ice shelves. We used observations from an automatic weather station at Cabinet Inlet on the northern Larsen C ice shelf between 25 November 2014 and 31 December 2016 to describe föhn dynamics. Observed föhn frequency was compared to the latest version of the regional climate model RACMO2.3p2, run over the Antarctic Peninsula at 5.5-km horizontal resolution. A föhn identification scheme based on observed wind conditions was employed to check for model biases in föhn representation. Seasonal variation in total föhn event duration was resolved with sufficient skill. The analysis was extended to the model period (1979–2016) to obtain a multidecadal perspective of föhn occurrence over Larsen C ice shelf. Föhn occurrence at Cabinet Inlet strongly correlates with near-surface air temperature, and both are found to relate strongly to the location and strength of the Amundsen Sea Low. Furthermore, we demonstrated that föhn occurrence over Larsen C ice shelf shows high variability in space and time. View Full-Text
Keywords: Föhn; Antarctic Peninsula; Larsen ice shelf; multidecadal analysis; automatic weather station; regional climate model Föhn; Antarctic Peninsula; Larsen ice shelf; multidecadal analysis; automatic weather station; regional climate model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Wiesenekker, J.M.; Kuipers Munneke, P.; van den Broeke, M.R.; Smeets, C.J.P.P. A Multidecadal Analysis of Föhn Winds over Larsen C Ice Shelf from a Combination of Observations and Modeling. Atmosphere 2018, 9, 172.

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