The Extraordinary March 2022 East Antarctica “Heat” Wave. Part II: Impacts on the Antarctic Ice Sheet

Jonathan D. Wille, Simon P. Alexander, Charles Amory, Rebecca Baiman, Léonard Barthélemy, Dana M. Bergstrom, Alexis Berne, Hanin Binder, Juliette Blanchet, Deniz Bozkurt, Thomas J. Bracegirdle, Mathieu Casado, Taejin Choi, Kyle R. Clem, Francis Codron, Rajashree Datta, Stefano Di Battista, Vincent Favier, Diana Francis, Alexander D. FraserElise Fourré, René D. Garreaud, Christophe Genthon, Irina V. Gorodetskaya, Sergi González-Herrero, Victoria J. Heinrich, Guillaume Hubert, Hanna Joos, Seong Joong Kim, John C. King, Christoph Kittel, Amaelle Landais, Matthew Lazzara, Gregory H. Leonard, Jan L. Lieser, Michelle Maclennan, David Mikolajczyk, Peter Neff, Inès Ollivier, Ghislain Picard, Benjamin Pohl, F. Martin Ralph, Penny Rowe, Elisabeth Schlosser, Christine A. Shields, Inga J. Smith, Michael Sprenger, Luke Trusel, Danielle Udy, Tessa Vance, Étienne Vignon, Catherine Walker, Nander Wever, Xun Zou

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Between 15 and 19 March 2022, East Antarctica experienced an exceptional heat wave with widespread 308–408C temperature anomalies across the ice sheet. In Part I, we assessed the meteorological drivers that generated an intense atmospheric river (AR) that caused these record-shattering temperature anomalies. Here, we continue our large collaborative study by analyzing the widespread and diverse impacts driven by the AR landfall. These impacts included widespread rain and surface melt that was recorded along coastal areas, but this was outweighed by widespread high snowfall accumulations resulting in a largely positive surface mass balance contribution to the East Antarctic region. An analysis of the surface energy budget indicated that widespread downward longwave radiation anomalies caused by large cloud-liquid water contents along with some scattered solar radiation produced intense surface warming. Isotope measurements of the moisture were highly elevated, likely imprinting a strong signal for past climate reconstructions. The AR event attenuated cosmic ray measurements at Concordia, something previously never observed. Last, an extratropical cyclone west of the AR landfall likely triggered the final collapse of the critically unstable Conger Ice Shelf while further reducing an already record low sea ice extent.

Original languageEnglish (US)
Pages (from-to)779-799
Number of pages21
JournalJournal of Climate
Volume37
Issue number3
DOIs
StatePublished - Feb 10 2024

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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