| Title: |
Iceberg Grounding Enhances the Release of Freshwater on the Antarctic Continental Shelf |
| Authors: |
Olivé Abelló, Anna; Mathiot, Pierre; Jourdain, Nicolas; Kostov, Yavor; Holland, Paul, R; Gascoin, Simon; Rousset, Clement |
| Contributors: |
Institut des Géosciences de l’Environnement (IGE); Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Observatoire des Sciences de l'Univers de Grenoble (Fédération OSUG)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP); Université Grenoble Alpes (UGA); British Antarctic Survey (BAS); Natural Environment Research Council (NERC); Centre d'études spatiales de la biosphère (CESBIO); Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université de Toulouse (EPE UT); Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Communauté d'universités et établissements de Toulouse (Comue de Toulouse); Nucleus for European Modeling of the Ocean (LOCEAN-NEMO R&D); Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN); Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)); École normale supérieure - Paris (ENS-PSL); Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X); Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL); Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)); Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité); ANR-22-EXTR-0008,IMPRESSION-ESM,TRansformative Advances in Climate modelling for Climate Services - Projet Ciblé 7 - IMproving the physical PRocESS representatION in Earth System Models(2022); ANR-22-EXTR-0010,ISClim,Polar Ice sheets(2022); European Project: 101060452,HORIZON-CL6-2021-CLIMATE-01,HORIZON-CL6-2021-CLIMATE-01,OCEAN ICE(2022) |
| Source: |
ISSN: 2169-9275. |
| Publisher Information: |
CCSD; Wiley-Blackwell |
| Publication Year: |
2025 |
| Collection: |
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
| Subject Terms: |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography; [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
| Description: |
International audience ; The importance of Antarctic iceberg meltwater for the Southern Ocean has been a strong incentive to include Lagrangian icebergs in ocean and climate models. However, the modeled iceberg thickness has previously been constrained to 250 m, which appears to be underestimated given the frequent observations of icebergs grounded on substantially deeper bathymetric ridges. In this study, we define the initial iceberg thickness based on the thickness of the ice shelf from which they calve and rationalize the way to define the iceberg size classes. Ocean-sea-ice-iceberg simulations reveal that more than half of the iceberg melting is discharged over the Antarctic continental shelf, reaching an average of 631 Gt yr 1 when the interaction of icebergs with bathymetry is neglected, and 802 Gt yr 1 when a simple grounding scheme is implemented. Such additional freshwater injected over the continental shelf prone to sea ice production has important consequences for the ocean properties around Antarctica. It enhances ocean stratification, inhibits deep convection and isolates dense deep waters from the colder and fresher surface layers. This isolation allows the deep waters to warm and become saltier, thereby intensifying subsequent ice-shelf melting. Moreover, the simulated distribution of grounded icebergs blocks drifting sea ice, promoting the formation of thick sea ice and polynyas when the fast ice parameterization is included. This work emphasizes the need for further research into the physical representation of iceberg grounding and iceberg-sea-ice interaction. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
info:eu-repo/grantAgreement//101060452/EU/Ocean Cryosphere Exchanges in ANtarctica: Impacts on Climate and the Earth system/OCEAN ICE; WOS: 001591082300001 |
| DOI: |
10.1029/2025jc022857 |
| Availability: |
https://hal.science/hal-05345075; https://hal.science/hal-05345075v1/document; https://hal.science/hal-05345075v1/file/JGR%20Oceans%20-%202025%20-%20Oliv%C3%A9%20Abell%C3%B3%20-%20Iceberg%20Grounding%20Enhances%20the%20Release%20of%20Freshwater%20on%20the%20Antarctic%20Continental%20Shelf.pdf; https://doi.org/10.1029/2025jc022857 |
| Rights: |
https://creativecommons.org/licenses/by/4.0/ ; info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.95B23CFA |
| Database: |
BASE |