West Antarctic surface melt triggered by atmospheric rivers

Wille, Jonathan D.; Favier, Vincent; Dufour, Ambrose; Gorodetskaya, Irina V.; Turner, John ORCID:; Agosta, Cecile; Codron, Francis. 2019 West Antarctic surface melt triggered by atmospheric rivers. Nature Geoscience, 12 (11). 911-916.

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Recent major melting events in West Antarctica have raised concerns about a potential hydrofracturing and ice shelf instability. These events often share common forcings of surface melt-like anomalous radiative fluxes, turbulent heat fluxes and föhn winds. Using an atmospheric river detection algorithm developed for Antarctica together with surface melt datasets, we produced a climatology of atmospheric river-related surface melting around Antarctica and show that atmospheric rivers are associated with a large percentage of these surface melt events. Despite their rarity (around 12 events per year in West Antarctica), atmospheric rivers are associated with around 40% of the total summer meltwater generated across the Ross Ice Shelf to nearly 100% in the higher elevation Marie Byrd Land and 40–80% of the total winter meltwater generated on the Wilkins, Bach, George IV and Larsen B and C ice shelves. These events were all related to high-pressure blocking ridges that directed anomalous poleward moisture transport towards the continent. Major melt events in the West Antarctic Ice Sheet only occur about a couple times per decade, but a 1–2 °C warming and continued increase in atmospheric river activity could increase the melt frequency with consequences for ice shelf stability.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 17520894
Additional Keywords: atmospheric dynamics, surface melt, mass balance, cryospheric science
Date made live: 08 Nov 2019 15:40 +0 (UTC)

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