Importance of the Antarctic Slope Current in the Southern Ocean Response to Ice Sheet Melt and Wind Stress Change

Beadling, R. L.; Krasting, J. P.; Griffies, S. M.; Hurlin, W. J.; Bronselaer, B.; Russell, J. L.; MacGilchrist, G. A.; Tesdal, J. ‐E.; Winton, M.

doi:10.1029/2021JC017608

Title: Importance of the Antarctic Slope Current in the Southern Ocean Response to Ice Sheet Melt and Wind Stress Change

Journal Article · 16 May 2022 · Journal of Geophysical Research. Oceans

DOI: https://doi.org/10.1029/2021JC017608 · OSTI ID:1870193

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University Corporation for Atmospheric Research Boulder CO USA, Geophysical Fluid Dynamics Laboratory NOAA Princeton NJ USA, Princeton University Atmospheric and Oceanic Sciences Program Princeton NJ USA
Geophysical Fluid Dynamics Laboratory NOAA Princeton NJ USA
Geophysical Fluid Dynamics Laboratory NOAA Princeton NJ USA, Princeton University Atmospheric and Oceanic Sciences Program Princeton NJ USA
Geophysical Fluid Dynamics Laboratory NOAA Princeton NJ USA, Princeton University Atmospheric and Oceanic Sciences Program Princeton NJ USA, British Petroleum London UK, Department of Geosciences University of Arizona Tucson AZ USA
Department of Geosciences University of Arizona Tucson AZ USA

Abstract We use two coupled climate models, GFDL‐CM4 and GFDL‐ESM4, to investigate the physical response of the Southern Ocean to changes in surface wind stress, Antarctic meltwater, and the combined forcing of the two in a pre‐industrial control simulation. The meltwater cools the ocean surface in all regions except the Weddell Sea, where the wind stress warms the near‐surface layer. The limited sensitivity of the Weddell Sea surface layer to the meltwater is due to the spatial distribution of the meltwater fluxes, regional bathymetry, and large‐scale circulation patterns. The meltwater forcing dominates the Antarctic shelf response and the models yield strikingly different responses along West Antarctica. The disagreement is attributable to the mean‐state representation and meltwater‐driven acceleration of the Antarctic Slope Current (ASC). In CM4, the meltwater is efficiently trapped on the shelf by a well resolved, strong, and accelerating ASC which isolates the West Antarctic shelf from warm offshore waters, leading to strong subsurface cooling. In ESM4, a weaker and diffuse ASC allows more meltwater to escape to the open ocean, the West Antarctic shelf does not become isolated, and instead strong subsurface warming occurs. The CM4 results suggest a possible negative feedback mechanism that acts to limit future melting, while the ESM4 results suggest a possible positive feedback mechanism that acts to accelerate melt. Our results demonstrate the strong influence the ASC has on governing changes along the shelf, highlighting the importance of coupling interactive ice sheet models to ocean models that can resolve these dynamical processes.

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Sponsoring Organization:: USDOE

OSTI ID:: 1870193

Journal Information:: Journal of Geophysical Research. Oceans, Journal Name: Journal of Geophysical Research. Oceans Journal Issue: 5 Vol. 127; ISSN 2169-9275

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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