Preprints
https://doi.org/10.5194/egusphere-2024-1372
https://doi.org/10.5194/egusphere-2024-1372
05 Aug 2024
 | 05 Aug 2024

DALROMS-NWA12 v1.0, a coupled circulation-ice-biogeochemistry modelling system for the northwest Atlantic Ocean: Development and validation

Kyoko Ohashi, Arnaud Laurent, Christoph Renkl, Jinyu Sheng, Katja Fennel, and Eric Oliver

Abstract. This study presents DalROMS-NWA12 v1.0, a coupled ocean circulation-sea ice-biogeochemistry modelling system for the northwest Atlantic Ocean (NWA) in which the circulation and biogeochemistry modules are based on ROMS (Regional Ocean Modeling System). The circulation module is coupled to a sea ice module based on the Community Ice CodE (CICE), and the physical ocean state simulated by the circulation module drives the biogeochemical module. Study of the biological carbon pump in the NWA is one of the main intended applications of this model. Global atmospheric and ocean reanalyses are used respectively to force DalROMS-NWA12 at the sea surface and as part of its lateral boundary input. The modelling system is also forced by tides, riverine freshwater input, and continental runoff. The physical ocean state and sea ice from two simulations of the period 2015–2018, with and without nudging of the simulated temperature and salinity towards a blend of observations and reanalysis, are examined in this study. Statistical comparisons between model results and observations or reanalyses show the control (nudged) simulation outperforms the prognostic (un-nudged) simulation in reproducing the paths of the Gulf Stream and the West Greenland Current, as well as propagation of the estuarine plume in the Gulf of St. Lawrence. The prognostic simulation performs better in simulating the sea ice concentration. The biogeochemical module, which is run only in the control simulation, performs reasonably well in reproducing the observed spatiotemporal variations of oxygen, nitrate, alkalinity, and total inorganic carbon. To examine the effects of tides and sea ice on the physical fields in the study area, results of simulations from which either component is absent are compared to results of the prognostic simulation. In the absence of tides, Ungava Bay in summer experiences a simulated surface salinity that is higher by up to ~7 than in the simulation with tides, as well as changes in horizontal distributions of surface temperature and sea ice. Without coupling to the sea ice module, the circulation module produces summertime sea surface temperatures that are higher by up to ~5 °C in Baffin Bay.

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Journal article(s) based on this preprint

10 Dec 2024
DalROMS-NWA12 v1.0, a coupled circulation–ice–biogeochemistry modelling system for the northwest Atlantic Ocean: development and validation
Kyoko Ohashi, Arnaud Laurent, Christoph Renkl, Jinyu Sheng, Katja Fennel, and Eric Oliver
Geosci. Model Dev., 17, 8697–8733, https://doi.org/10.5194/gmd-17-8697-2024,https://doi.org/10.5194/gmd-17-8697-2024, 2024
Short summary
Kyoko Ohashi, Arnaud Laurent, Christoph Renkl, Jinyu Sheng, Katja Fennel, and Eric Oliver

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-1372', Anonymous Referee #1, 11 Aug 2024
    • AC1: 'Reply on RC1', Kyoko Ohashi, 28 Aug 2024
      • RC3: 'Reply on AC1', Anonymous Referee #1, 05 Sep 2024
        • AC2: 'Reply on RC3', Kyoko Ohashi, 10 Sep 2024
          • RC4: 'Reply on AC2', Anonymous Referee #2, 11 Sep 2024
            • AC4: 'Reply on RC4', Kyoko Ohashi, 11 Sep 2024
  • RC2: 'Comment on egusphere-2024-1372', Anonymous Referee #2, 02 Sep 2024
    • AC3: 'Reply on RC2', Kyoko Ohashi, 10 Sep 2024

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-1372', Anonymous Referee #1, 11 Aug 2024
    • AC1: 'Reply on RC1', Kyoko Ohashi, 28 Aug 2024
      • RC3: 'Reply on AC1', Anonymous Referee #1, 05 Sep 2024
        • AC2: 'Reply on RC3', Kyoko Ohashi, 10 Sep 2024
          • RC4: 'Reply on AC2', Anonymous Referee #2, 11 Sep 2024
            • AC4: 'Reply on RC4', Kyoko Ohashi, 11 Sep 2024
  • RC2: 'Comment on egusphere-2024-1372', Anonymous Referee #2, 02 Sep 2024
    • AC3: 'Reply on RC2', Kyoko Ohashi, 10 Sep 2024

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Kyoko Ohashi on behalf of the Authors (02 Oct 2024)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (10 Oct 2024) by Andrew Yool
AR by Kyoko Ohashi on behalf of the Authors (16 Oct 2024)

Journal article(s) based on this preprint

10 Dec 2024
DalROMS-NWA12 v1.0, a coupled circulation–ice–biogeochemistry modelling system for the northwest Atlantic Ocean: development and validation
Kyoko Ohashi, Arnaud Laurent, Christoph Renkl, Jinyu Sheng, Katja Fennel, and Eric Oliver
Geosci. Model Dev., 17, 8697–8733, https://doi.org/10.5194/gmd-17-8697-2024,https://doi.org/10.5194/gmd-17-8697-2024, 2024
Short summary
Kyoko Ohashi, Arnaud Laurent, Christoph Renkl, Jinyu Sheng, Katja Fennel, and Eric Oliver

Data sets

DALROMS-NWA12 v1.0, a coupled circulation-sea ice-biogeochemistry model for the northwest North Atlantic: input files (1 of 3) K. Ohashi et al. https://zenodo.org/records/12752190

DALROMS-NWA12 v1.0, a coupled circulation-sea ice-biogeochemistry model for the northwest North Atlantic: input files (2 of 3) K. Ohashi et al. https://zenodo.org/records/12734049

DALROMS-NWA12 v1.0, a coupled circulation-sea ice-biogeochemistry model for the northwest North Atlantic: input files (3 of 3) K. Ohashi et al. https://zenodo.org/records/12735153

DALROMS-NWA12 v1.0, a coupled circulation-sea ice-biogeochemistry model for the northwest North Atlantic: output files (1 of 2) K. Ohashi et al. https://zenodo.org/records/12744506

DALROMS-NWA12 v1.0, a coupled circulation-sea ice-biogeochemistry model for the northwest North Atlantic: output files (2 of 2) K. Ohashi et al. https://zenodo.org/records/12746262

Model code and software

DALROMS-NWA12 v1.0, a coupled circulation-sea ice-biogeochemistry model for the northwest North Atlantic: codes and namelists K. Ohashi et al. https://zenodo.org/records/12752091

Kyoko Ohashi, Arnaud Laurent, Christoph Renkl, Jinyu Sheng, Katja Fennel, and Eric Oliver

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Short summary
We developed a modelling system of the northwest Atlantic Ocean that simulates the currents, temperature, salinity, and parts of the biochemical cycle of the ocean, as well as sea ice. The system combines advanced, open-source models and can be used to study, for example, the oceans’ capture of atmospheric carbon dioxide which is a key process in the global climate. The system produces realistic results, and we use it to investigate the roles of tides and sea ice in the northwest Atlantic Ocean.