Journal cover Journal topic
Ocean Science An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/os-2017-9
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
17 Mar 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Ocean Science (OS) and is expected to appear here in due course.
On the deep convection events and Antarctic Bottom Water formation in ocean reanalysis products
Wilton Aguiar, Mauricio M. Mata, and Rodrigo Kerr Laboratório de Estudos dos Oceanos e Clima, Instituto de Oceanografia, Universidade Federal de Rio Grande – FURG, Rio Grande, RS, 96203-900, Brazil
Abstract. Deep convection in open ocean polynyas are common sources of error on the representation of Antarctic Bottom Water (AABW) formation in Ocean General Circulation Models. Even though those events are well described in non-assimilatory ocean simulations, recent appearance of open ocean polynya in Estimating the Circulation and Climate of the Ocean Phase II reanalysis product raises a question if this spurious event is also found in state-of-art reanalysis products. In order to answer this question, we evaluate how three recently released high-resolution ocean reanalysis form AABW in their simulations. We found that two of them (ECCO2 and SoSE) create AABW by open ocean deep convection events in Weddell Sea, showing that assimilation of sea ice has not been enough to avoid open ocean polynya appearance. The third reanalysis – My Ocean University Reading – actually creates AABW by a rather dynamically accurate mechanism, depicting both continental shelf convection, and exporting of Dense Shelf Water to open ocean. Although the accuracy of the AABW formation in this reanalysis allows an advance in represent this process, the differences found between the real ocean and the simulated one suggests that ocean reanalysis still need substantial improvements to accurately represent AABW formation.

Citation: Aguiar, W., Mata, M. M., and Kerr, R.: On the deep convection events and Antarctic Bottom Water formation in ocean reanalysis products, Ocean Sci. Discuss., https://doi.org/10.5194/os-2017-9, in review, 2017.
Wilton Aguiar et al.
Wilton Aguiar et al.

Viewed

Total article views: 596 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
474 89 33 596 4 28

Views and downloads (calculated since 17 Mar 2017)

Cumulative views and downloads (calculated since 17 Mar 2017)

Viewed (geographical distribution)

Total article views: 596 (including HTML, PDF, and XML)

Thereof 592 with geography defined and 4 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 21 Oct 2017
Publications Copernicus
Download
Short summary
In ocean models, Antarctic Bottom Water (AABW) formation is frequently misrepresented. Hence, assessing the causes of spurious formation is important to assure accurate future simulations. Only one of the state-of-art reanalysis investigated showed AABW formation accurately. Spurious formation in the other two products resulted from opening of large ice-free areas. The relatively accurate AABW formation in one of the products is an important advance on the simulation of deep ocean circulation.
In ocean models, Antarctic Bottom Water (AABW) formation is frequently misrepresented. Hence,...
Share