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Numerical investigation of the Ross Sea water masses using the Regional Ocean Modelling System - ROMS (2014)

  • Authors:
  • Autor USP: TONELLI, MARCOS HENRIQUE MARUCH - IO
  • Unidade: IO
  • Sigla do Departamento: IOF
  • Assunto: CIRCULAÇÃO OCEÂNICA
  • Language: Inglês
  • Abstract: Dense water formation around Antarctica is recognized as a significant process that significantly impacts the global climate, since that's where the linkage between the upper and lower limbs of Global Thermohaline Circulation takes place. Assessing whether these processes may be affected by rapid climate changes and all the eventual feedbacks is crucial to fully understand the ocean heat transport and to provide quality future climate projections. Applying the Coordinated Ocean-Ice Reference (CORE) interannual forcing we have run a 50-year simulation (1948-2007) using ROMS with a new sea ice/ice shelf thermodynamics module. Another 100-year simulation forced with CORE normal year was previously run to provide stable starting fields. The normal year consists of single annual cycle of all the data that are representative of climatological conditions over decades and can be applied repeatedly for as many years of model integration as necessary. The 60-year forcing has interannually varying data from 1948 to 2007, which allows validation of model output with ocean observations. Both experiments employed a periodic circumpolar variable resolution grid reaching less than 5 km at the southern border. By applying the OMP water masses separating scheme, we were able to identify the main Ross Sea water masses: Antarctic Surface Water (AASW), Circumpolar Deep Water (CDW), Antarctic Bottom Water (AABW) and Shelf Water (SW), further separated into Ice Shelf Water (ISW) and High Salinity Shelf Water (HSSW). Results are consistent with previous observational studies (Bergamasco, 2002; Orsi & Wiederwohl, 2009; Budillon, 2011). The interannual simulation indicates that the Southern Ocean is becoming warmer and less salty. The CDW poleward heat transport increased while shelf waters salinity as well as the AABW salinity decreased during the simulation period, consistent with Johnson & Doney (2006), who have reported the export of less dense AABW. ROMS capability (Continua)(continuação) to represent ISW, HSSW and AABW is an important contribution to climate studies, since IPCC class models seem unable to provide reliable representations of such important processes, which may lead to projections of more realistic scenarios. This is significantly improved in this study by including more explicit sea ice/ice shelf parameretization. ROMS is able to reproduce cryosphere-linked mechanisms of dense water formation around Antarctica.
  • Imprenta:
  • Data da defesa: 14.04.2014
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    • ABNT

      TONELLI, Marcos; WAINER, Ilana Elazari Klein Coaracy. Numerical investigation of the Ross Sea water masses using the Regional Ocean Modelling System - ROMS. 2014.Universidade de São Paulo, São Paulo, 2014. Disponível em: < http://www.teses.usp.br/teses/disponiveis/21/21135/tde-21012015-090549/pt-br.php >.
    • APA

      Tonelli, M., & Wainer, I. E. K. C. (2014). Numerical investigation of the Ross Sea water masses using the Regional Ocean Modelling System - ROMS. Universidade de São Paulo, São Paulo. Recuperado de http://www.teses.usp.br/teses/disponiveis/21/21135/tde-21012015-090549/pt-br.php
    • NLM

      Tonelli M, Wainer IEKC. Numerical investigation of the Ross Sea water masses using the Regional Ocean Modelling System - ROMS [Internet]. 2014 ;Available from: http://www.teses.usp.br/teses/disponiveis/21/21135/tde-21012015-090549/pt-br.php
    • Vancouver

      Tonelli M, Wainer IEKC. Numerical investigation of the Ross Sea water masses using the Regional Ocean Modelling System - ROMS [Internet]. 2014 ;Available from: http://www.teses.usp.br/teses/disponiveis/21/21135/tde-21012015-090549/pt-br.php


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