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Article Dans Une Revue Journal of Climate Année : 2024

The extraordinary March 2022 East Antarctica “heat” wave. Part II: impacts on the Antarctic ice sheet

1 IGE - Institut des Géosciences de l’Environnement
2 Loyola University [Chicago]
3 ATOC - Department of Atmospheric and Oceanic Sciences [Boulder]
4 VARCLIM - Océan et variabilité du climat
5 LOCEAN - Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
6 EPFL - Ecole Polytechnique Fédérale de Lausanne
7 IAC - Institute for Atmospheric and Climate Science [Zürich]
8 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
9 Universidad de Valparaiso [Chile]
10 BAS - British Antarctic Survey
11 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
12 KOPRI - Korea Polar Research Institute
13 SU - Sorbonne Université
14 UPMC - Université Pierre et Marie Curie - Paris 6
15 ENGEOS Lab - Environmental and Geophysical Sciences Lab
16 IMAS - Institute for Marine and Antarctic Studies [Hobart]
17 GLACCIOS - Glaces et Continents, Climats et Isotopes Stables
18 Departamento de Geofísica [Santiago]
19 CESAM - Centre for Environmental and Marine Studies [Aveiro]
20 SLF - SLF Institut pour l'étude de la neige et des avalanches
21 AEMet - Agencia Estatal de Meteorología
22 DPHY, ONERA, Université de Toulouse [Toulouse]
23 URI - University of Rhode Island
24 SSEC - Space Science and Engineering Center [Madison]
25 UMN - University of Minnesota [Twin Cities]
26 BCCR - Bjerknes Centre for Climate Research
27 BGS - Biogéosciences [UMR 6282]
28 CRC - Centre de Recherches de Climatologie [UMR Biogéosciences]
29 UB - Université de Bourgogne
30 CNRS - Centre National de la Recherche Scientifique
31 SIO - UC San Diego - Scripps Institution of Oceanography
32 NWRA - NorthWest Research Associates
33 Universität Innsbruck [Innsbruck]
34 Penn State - Pennsylvania State University
Kyle R Clem
  • Fonction : Auteur
Stefano Di Battista
  • Fonction : Auteur
Victoria J Heinrich
  • Fonction : Auteur
Gregory H Leonard
  • Fonction : Auteur
Jan L Lieser
  • Fonction : Auteur
Christine A Shields
  • Fonction : Auteur
Inga J Smith
  • Fonction : Auteur
Danielle Udy
  • Fonction : Auteur
Tessa Vance
  • Fonction : Auteur
Catherine Walker
  • Fonction : Auteur
Nander Wever
  • Fonction : Auteur
Xun Zou
  • Fonction : Auteur

Résumé

Between March 15-19, 2022, East Antarctica experienced an exceptional heatwave with widespread 30-40° C temperature anomalies across the ice sheet. In Part I, we assessed the meteorological drivers that generated an intense atmospheric river (AR) which caused these record-shattering temperature anomalies. Here in Part II, 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 which 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. Finally, 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.
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Dates et versions

hal-04289361 , version 1 (16-11-2023)

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Jonathan D Wille, Simon P Alexander, Charles Amory, Rebecca Baiman, Léonard Barthélemy, et al.. The extraordinary March 2022 East Antarctica “heat” wave. Part II: impacts on the Antarctic ice sheet. Journal of Climate, 2024, 37 (3), pp.779-799. ⟨10.1175/JCLI-D-23-0176.1⟩. ⟨hal-04289361⟩
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