Article Dans Une Revue Ocean Science Année : 2025

Capturing dense shelf water cascading with a high-resolution ocean reanalysis

Helena Fos
Jesús Peña-Izquierdo
David Amblas
Marta Arjona-Camas
Laia Romero
  • Fonction : Auteur
Antoni Calafat
Marc Cerdà-Domènech
Pere Puig
Anna Sanchez-Vidal

Résumé

Abstract. Dense shelf water cascading (DSWC) is an oceanographic process that occurs when dense shelf water overflows over the shelf edge downslope toward the deep sea. Monitored in the northwestern Mediterranean by moorings since 1993 in the Lacaze-Duthiers Canyon and since 2005 in the Cap de Creus Canyon, numerical modeling with reanalysis extends this timeline further into the past. This study investigates a regional reanalysis (1987–2021) validated against mooring observations at 750–1000 m depth. The reanalysis successfully reproduces observed intense DSWC (IDSWC) events from 1999, 2000, 2005, 2006, 2012, 2013, and 2018 while identifying one previously unreported event in 1987 and detecting no IDSWC between 1988 and 1998. The reanalysis effectively matches 84 % of observed IDSWC days within the same week and 56 % on the exact date. Instead of assimilating IDSWC events from mooring observations to resolve the cascading process, the model relies solely on the seawater density on the shelf and revealed the seawater properties along the canyon that caused IDSWC. This work highlights the importance of high-resolution reanalyses in investigating the impacts of mesoscale processes on larger scales in the deep ocean.

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Cite 10.25423/CMCC/MEDSEA_MULTIYEAR_PHY_006_004_E3R1 Jeu de données Escudier, R., Clementi, E., Omar, M., Cipollone, A., Pistoia, J., Aydogdu, A., Drudi, M., Grandi, A., Lyubartsev, V., Lecci, R., Cretí, S., Masina, S., Coppini, G., & Pinardi, N. (2020). Mediterranean Sea Physical Reanalysis (CMEMS MED-Currents, E3R1 system) (Version 1) [Data set]. Copernicus Monitoring Environment Marine Service (CMEMS). https://doi.org/10.25423/CMCC/MEDSEA_MULTIYEAR_PHY_006_004_E3R1

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Cite 10.17882/45980 Jeu de données Durrieu De Madron, X., Heussner, S., Delsaut, N., Kunesch, S., & Menniti, C. (2024). BILLION observatory data [Data set]. SEANOE. https://doi.org/10.17882/45980

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Cite 10.17882/104746 Jeu de données Sanchez-Vidal, A., Calafat, A., Amblas, D., Cerdà-Domènech, M., & Fos, H. (2025). CC1000 observatory data [Data set]. SEANOE. https://doi.org/10.17882/104746

DOI

Cite 10.17882/104799 Jeu de données Puig, P., & Palanques, A. (2025). CC750 observatory data [Data set]. SEANOE. https://doi.org/10.17882/104799

Dates et versions

hal-05347049 , version 1 (06-11-2025)

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Helena Fos, Jesús Peña-Izquierdo, David Amblas, Marta Arjona-Camas, Laia Romero, et al.. Capturing dense shelf water cascading with a high-resolution ocean reanalysis. Ocean Science, 2025, 21 (5), pp.2169-2178. ⟨10.5194/os-21-2169-2025⟩. ⟨hal-05347049⟩
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