The 2020 Larsen C Ice Shelf surface melt is a 40-year record high
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Published:2020-10-27
Issue:10
Volume:14
Page:3551-3564
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Bevan SuzanneORCID, Luckman AdrianORCID, Hendon Harry, Wang Guomin
Abstract
Abstract. Along with record-breaking summer air temperatures at an Antarctic Peninsula meteorological station in February 2020, the Larsen C ice shelf experienced an exceptionally long and extensive 2019/2020 melt season. We use a 40-year time series of passive and scatterometer satellite microwave data, which are sensitive to the presence of liquid water in the snow pack, to reveal that the extent and duration of melt observed on the ice shelf in the austral summer of 2019/2020 was the greatest on record. We find that unusual perturbations to Southern Hemisphere modes of atmospheric flow, including a persistently positive Indian Ocean Dipole in the spring and a very rare Southern Hemisphere sudden stratospheric warming in September 2019, preceded the exceptionally warm Antarctic Peninsula summer. It is likely that teleconnections between the tropics and southern high latitudes were able to bring sufficient heat via the atmosphere and ocean to the Antarctic Peninsula to drive the extreme Larsen C Ice Shelf melt. The record-breaking melt of 2019/2020 brought to an end the trend of decreasing melt that had begun in 1999/2000, will reinitiate earlier thinning of the ice shelf by depletion of the firn air content, and probably affected a much greater region than Larsen C Ice Shelf.
Funder
Natural Environment Research Council
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
Reference48 articles.
1. Adusumilli, S., Fricker, H. A., Siegfried, M. R., Padman, L., Paolo, F. S., and Ligtenberg, S. R. M.: Variable Basal Melt Rates of Antarctic
Peninsula Ice Shelves, 1994–2016, Geophys. Res. Lett., 45,
4086–4095, https://doi.org/10.1002/2017GL076652, 2018. a 2. Arblaster, J. M. and Meehl, G. A.: Contributions of External Forcings to
Southern Annular Mode Trends, J. Climate, 19, 2896–2905,
https://doi.org/10.1175/JCLI3774.1, 2006. a 3. Armstrong, R., Knowles, K., Brodzik, M. J., and Hardman, M. A.: DMSP
SSM/I-SSMIS Pathfinder Daily EASE-Grid Brightness
Temperatures, Version 2. Boulder, Colorado USA, NASA National
Snow and Ice Data Center Distributed Active Archive Center,
https://doi.org/10.5067/3EX2U1DV3434, 1994. a 4. Ashcraft, I. S. and Long, D. G.: Comparison of methods for melt detection over Greenland using active and passive microwave measurements, Int. J. Remote Sens., 27, 2469–2488, https://doi.org/10.1080/01431160500534465, 2006. a, b, c 5. Banwell, A. F., MacAyeal, D. R., and Sergienko, O. V.: Breakup of the Larsen B Ice Shelf triggered by chain reaction drainage of supraglacial lakes, Geophys. Res. Lett., 40, 5872–5876, https://doi.org/10.1002/2013GL057694, 2013. a
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