Preprints
https://doi.org/10.22541/essoar.174060515.57729804/v2
https://doi.org/10.22541/essoar.174060515.57729804/v2
31 Mar 2025
 | 31 Mar 2025

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

Helena Fos, Jesús Peña-Izquierdo, David Amblas, Marta Arjona-Camas, Laia Romero, Victor Estella-Pérez, Cristian Florindo-Lopez, Antoni Calafat-Frau, Marc Cerdà-Domènech, Pere Puig, Xavier Durrieu de Madron, and Anna Sanchez-Vidal

Abstract. Dense shelf water cascading (DSWC) is an oceanographic process occurring when dense shelf water overflows the shelf edge downslope towards the deep sea. Monitored in the Northwestern Mediterranean by moorings since 1993 in the Lacaze-Duthiers Canyon and since 2003 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. Reanalysis data have revealed the seawater properties along the canyon that caused IDSWC and can be used to find other unreported cascading events elsewhere.

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Journal article(s) based on this preprint

02 Oct 2025
Capturing dense shelf water cascading with a high-resolution ocean reanalysis
Helena Fos, Jesús Peña-Izquierdo, David Amblas, Marta Arjona-Camas, Laia Romero, Víctor Estella-Pérez, Cristian Florindo-Lopez, Antoni Calafat, Marc Cerdà-Domènech, Pere Puig, Xavier Durrieu de Madron, and Anna Sanchez-Vidal
Ocean Sci., 21, 2169–2178, https://doi.org/10.5194/os-21-2169-2025,https://doi.org/10.5194/os-21-2169-2025, 2025
Short summary
Helena Fos, Jesús Peña-Izquierdo, David Amblas, Marta Arjona-Camas, Laia Romero, Victor Estella-Pérez, Cristian Florindo-Lopez, Antoni Calafat-Frau, Marc Cerdà-Domènech, Pere Puig, Xavier Durrieu de Madron, and Anna Sanchez-Vidal

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-1309', Anonymous Referee #1, 16 Apr 2025
    • CEC1: 'Reply on RC1', Karen J. Heywood, 16 Apr 2025
    • AC2: 'Reply on RC1', Helena Fos, 27 Jun 2025
  • RC2: 'Comment on egusphere-2025-1309', Anonymous Referee #2, 12 May 2025
    • AC1: 'Reply on RC2', Helena Fos, 27 Jun 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-1309', Anonymous Referee #1, 16 Apr 2025
    • CEC1: 'Reply on RC1', Karen J. Heywood, 16 Apr 2025
    • AC2: 'Reply on RC1', Helena Fos, 27 Jun 2025
  • RC2: 'Comment on egusphere-2025-1309', Anonymous Referee #2, 12 May 2025
    • AC1: 'Reply on RC2', Helena Fos, 27 Jun 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Helena Fos on behalf of the Authors (27 Jun 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (30 Jun 2025) by Anne Marie Treguier
RR by Anonymous Referee #2 (07 Jul 2025)
RR by Anonymous Referee #1 (08 Jul 2025)
ED: Publish as is (12 Jul 2025) by Anne Marie Treguier
AR by Helena Fos on behalf of the Authors (16 Jul 2025)  Manuscript 

Journal article(s) based on this preprint

02 Oct 2025
Capturing dense shelf water cascading with a high-resolution ocean reanalysis
Helena Fos, Jesús Peña-Izquierdo, David Amblas, Marta Arjona-Camas, Laia Romero, Víctor Estella-Pérez, Cristian Florindo-Lopez, Antoni Calafat, Marc Cerdà-Domènech, Pere Puig, Xavier Durrieu de Madron, and Anna Sanchez-Vidal
Ocean Sci., 21, 2169–2178, https://doi.org/10.5194/os-21-2169-2025,https://doi.org/10.5194/os-21-2169-2025, 2025
Short summary
Helena Fos, Jesús Peña-Izquierdo, David Amblas, Marta Arjona-Camas, Laia Romero, Victor Estella-Pérez, Cristian Florindo-Lopez, Antoni Calafat-Frau, Marc Cerdà-Domènech, Pere Puig, Xavier Durrieu de Madron, and Anna Sanchez-Vidal
Helena Fos, Jesús Peña-Izquierdo, David Amblas, Marta Arjona-Camas, Laia Romero, Victor Estella-Pérez, Cristian Florindo-Lopez, Antoni Calafat-Frau, Marc Cerdà-Domènech, Pere Puig, Xavier Durrieu de Madron, and Anna Sanchez-Vidal

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Short summary
Dense Shelf Water Cascading (DSWC) is an oceanographic process where dense shelf water rapidly spills over the shelf edge and cascades into the deep ocean. Using a high-resolution model that incorporates real observations from the water column and sea surface (MedSea Reanalysis), this study compares over 30 years of simulated intense DSWC with actual observations in the NW Mediterranean. We identified all the cascading events since 1987, with results closely matching the observations.
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