| Title: |
Modelled dynamics of floating and grounded icebergs, with application to the Amundsen Sea |
| Authors: |
Kostov, Yavor; Holland, Paul, R; Hogan, Kelly, A; Smith, James, A; Jourdain, Nicolas, C; Mathiot, Pierre; Olivé Abelló, Anna; Fleming, Andrew, H; Meijers, Andrew, J S |
| Contributors: |
British Antarctic Survey (BAS); Natural Environment Research Council (NERC); 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); 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: 1994-0424. |
| Publisher Information: |
CCSD; European Geosciences Union |
| Publication Year: |
2026 |
| Collection: |
Université Grenoble Alpes: HAL |
| Subject Terms: |
Iceberg; [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere |
| Description: |
International audience ; Icebergs that ground on the submarine Bear Ridge in the Amundsen Sea are known to block the drift of sea ice, playing a crucial role in maintaining shelf sea ocean conditions. This important iceberg-sea ice-ocean interaction is commonly observed around the Antarctic shelf seas. To better represent the drift, grounding, and ungrounding of icebergs in the vicinity of such seabed ridges, we introduce new dynamics into the iceberg component of the Nucleus for European Modelling of the Ocean (NEMO) ocean general circulation model. We implement a physically-motivated grounding scheme with parameter choices guided by observations from the Amundsen Sea. When the bergs are grounded, they now experience bottom sediment resistance, bedrock friction, and an iceberg acceleration due to gravity acting down topographic slopes. We also improve the representation of ocean turbulent drag and ocean pressure gradients, both for freely-floating and grounded icebergs, by incorporating the depth-dependence of these forces. We examine the diverse set of forces acting on simulated icebergs in the Amundsen Sea, and compare our simulations with iceberg observations near Bear Ridge. The new iceberg physics paves the way for future studies to explore the existence of possible feedback mechanisms between iceberg grounding, changing sea ice and ocean conditions, and iceberg calving from the ice shelves. |
| 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 |
| DOI: |
10.5194/tc-20-135-2026 |
| Availability: |
https://hal.science/hal-05529487; https://hal.science/hal-05529487v1/document; https://hal.science/hal-05529487v1/file/tc-20-135-2026.pdf; https://doi.org/10.5194/tc-20-135-2026 |
| Rights: |
https://creativecommons.org/licenses/by/4.0/ ; info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.106787FA |
| Database: |
BASE |