Resposta das circulações oceânica e atmosférica associada ao aumento na tensão de cisalhamento do vento

• Ano de defesa: 2013
• Autor(a) principal: Machado, Jéferson Prietsch
• Orientador(a): Justino, Flávio Barbosa
• Banca de defesa: Gherardi, Douglas Francisco Marcolino , Brito, José Ivaldo Barbosa de , Souza, Ronald Buss de
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Meteorologia Agrícola
• Departamento: Agrometeorologia; Climatologia; Micrometeorologia
• País: BR
• Palavras-chave em Português: Climatologia; Circulação oceânica; Circulação atmosférica; Mudanças climáticas
• Palavras-chave em Inglês: Climatology; Ocean circulation; Atmospheric circulation; Climate Change
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::METEOROLOGIA::CLIMATOLOGIA
• Link de acesso: http://locus.ufv.br/handle/123456789/1517

The wind stress is a measure of momentum transfer due to the relative motion between the atmosphere and the ocean. Studies have suggested an intensification and an offset of wind stress further south in the Southern Ocean due to the intensification of the wind in extratropical latitudes in the Southern Hemisphere, in response to climate change. Thus, the objective of this work is to investigate the anomalous behavior of the atmospheric and oceanic circulations due to increased wind stress by 50% in the equatorial region and in the Southern Ocean. For this purpose, we used a coupled climate model of intermediate complexity (SPEEDO). The intensification of wind stress in equatorial region causes a decrease in sea surface temperature in the tropical region, due to increased upwelling. Consequently, the air temperature also reduces, favoring the reduction of precipitation in equatorial region. Moreover, the intensification of wind stress in Southern Ocean, induces an increase in sea surface temperature and air temperature to high latitudes of the Southern Hemisphere, in addition to a reduction in Antarctic sea ice thickness. This occurs due to changes in water bodies and global thermohaline circulation, favouring the intensification of Antarctic bottom Water and a weakening of the North Atlantic Deep Water. Due to the least thermal gradient, the total heat transport becomes more intense in the Southern Hemisphere, reducing the baroclinic activity and storm tracks; In addition, the positive phase of the Antarctic Oscillation is less intense.