SciELO - Scientific Electronic Library Online

 
vol.25 número1Seca regional no sul da América do Sul: aspectos físicosSéries anuais de temperatura máxima média do ar no Estado de São Paulo: variações e tendências climáticas índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Revista Brasileira de Meteorologia

versão impressa ISSN 0102-7786

Resumo

JUSTINO, Flávio Barbosa  e  MACHADO, Jeferson Prietsch. Climate feedbacks induced by the North Atlantic freshwater forcing in a coupled model of intermediate complexity. Rev. bras. meteorol. [online]. 2010, vol.25, n.1, pp.103-113. ISSN 0102-7786.  https://doi.org/10.1590/S0102-77862010000100009.

Based on coupled model simulations (ECBilt-Clio), we investigate the atmospheric and oceanic response to sustained freshwater input into the North Atlantic under the glacial maximum background state. The results demonstrate that a weakening of the thermohaline circulation triggered by weaker density flux leads to rapid changes in global sea-ice volume and reduced poleward heat transport in the Northern Hemisphere (NH). In the Southern Hemisphere (SH), however, the oceanic heat transport increases substantially. This in turn leads to strong cooling over the North Atlantic whereas the SH extratropical region warms up. The suppression of the NADW also drastically changes the atmospheric circulation. The associated northward wind anomalies over the North Atlantic increase the warm air advection from the tropics and induce the transport of tropical saltier water to mid-latitudes. This negative atmospheric-oceanic feedback should play an important role to resume the NADW, after the freshwater forcing ends up.

Palavras-chave : Thermohaline circulation; climate changes; baroclinic activity.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons