Preprints
https://doi.org/10.5194/os-2021-11
https://doi.org/10.5194/os-2021-11

  24 Mar 2021

24 Mar 2021

Review status: this preprint has been withdrawn by the authors.

Impacts of a large extra-tropical cyclonic system in Southern Brazilian Continental Shelf using the COAWST model

Luis Felipe F. Mendonça1,6,7, Antônio F. H. Fetter-Filho2, Mauro M. Andrade3, Fabricio S. C. Oliveira4, Douglas S. Lindemann5,8, Rose Ane P. Freitas5, and Carlos. A. D. Lentini1,6,7 Luis Felipe F. Mendonça et al.
  • 1Federal University of Bahia – UFBA, Salvador, Brazil
  • 2Federal University of Santa Catarina - UFSC, Florianópolis, Brazil
  • 3University of Itajaí - UNIVALI – Itajaí, Brazil
  • 4Federal University of Rio Grande - FURG, Rio Grande, Brazil
  • 5Federal University of Pelotas – UFPEL, Pelotas, Brazil
  • 6Tropical Oceanography Group – GOAT
  • 7Postgraduate Program in Geochemistry: Petroleum and Environment (POSPETRO) – UFBA, Salvador, Brazil
  • 8Postgraduate Program in Meteorology – UFPEL, Pelotas, Brazil

Abstract. The Southern Brazilian Continental Shelf (SBCS) is an area with great ecological and economic importance to Brazil. In this region can be observed the recurrent passage of frontal systems and extra-tropical cyclones, which are more frequent during the winter months of the southern hemisphere. These systems act on the ocean surface layers as direct driving forces, which may change the thermohaline structure of the water column and induce sea level perturbations. This study used the coupled ocean-atmosphere regional model (COAWST) to evaluate the effect of the passage of a frontal system associated with an extra-tropical cyclone. The ROMS oceanic model was configured with two nested grids, in order to solve the hydrodynamic processes at different scales. The parent (20–40° S/40–60° W) and child (25–29.3° S/46.3–50° W) grid comprise the coastal region, with a horizontal resolution of 1/9° and 1/27°, respectively, with 32 vertical levels. The initial conditions are the Global Analysis Forecast from CMEMS and forcing files used the Climate Forecast System v.2 (CFSv2) data, from NCEP. This event took place on the continental shelf of the State of Santa Catarina, in September of 2016. The model results were compared to remote sensing data and to the tide gauges from the City of Imbituba (State of Santa Catarina, Brazil). The comparison showed a correlation higher than 78 % between sea level rise data and the model results. The filtering of sea level data made it possible to identify the meteorological component in the model results. The comparison between the tidal-gauge and the model output presented values under 25 cm. The model was capable of representing the sea level anomalies propagation associated with the passage of the atmospheric frontal system. The model output showed the presence of a sea level anomaly propagating northward along the continental shelf at 480 km day−1, probably associated with the presence of a coastal-trapped wave.

This preprint has been withdrawn.

Luis Felipe F. Mendonça et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on os-2021-11', Anonymous Referee #1, 10 Apr 2021
    • AC1: 'Reply on RC1', Luis Felipe Mendonça, 20 Apr 2021
    • CC1: 'Reply on RC1', Luis Felipe Mendonça, 20 Apr 2021
  • RC2: 'Comment on os-2021-11', Anonymous Referee #2, 23 Apr 2021
    • CC2: 'Reply on RC2', Luis Felipe Mendonça, 30 Apr 2021

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on os-2021-11', Anonymous Referee #1, 10 Apr 2021
    • AC1: 'Reply on RC1', Luis Felipe Mendonça, 20 Apr 2021
    • CC1: 'Reply on RC1', Luis Felipe Mendonça, 20 Apr 2021
  • RC2: 'Comment on os-2021-11', Anonymous Referee #2, 23 Apr 2021
    • CC2: 'Reply on RC2', Luis Felipe Mendonça, 30 Apr 2021

Luis Felipe F. Mendonça et al.

Model code and software

set_child_diag.nc / set_child_grd.nc / set_child_his.nc Luís Felipe Mendonça https://1drv.ms/u/s!AhHBb-FlJjz9hY4emL79h33KsB9LCA?e=XVID1p

set_grd.nc / Set_his.nc Luís Felipe Mendonça https://1drv.ms/u/s!AhHBb-FlJjz9hY4emL79h33KsB9LCA?e=XVID1p

Luis Felipe F. Mendonça et al.

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This preprint has been withdrawn.

Short summary
This study used the coupled ocean-atmosphere regional model (COAWST) to evaluate the effect of the passage of a frontal system associated with an extra-tropical cyclone. The ocean and atmosphere models (ROMS and WRF) was configured with two nested grids, in order to solve the dynamic processes, at different scales, that comprise the energy transfer from the atmospheric system to the ocean.