SciELO - Scientific Electronic Library Online

 
vol.27 número4Avaliação da influência de condições meteorológicas na ocorrência e manutenção de um episódio prolongado com altas concentrações de ozônio sobre a região metropolitana de São PauloRefinamento de imagens termais do Landsat 5 - TM com base em classes de NDVI 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

MOURA, Maurício do Nascimento  e  VITORINO, Maria Isabel. Variability of rainfall in time and space associated with Intertropical Convergence Zone. Rev. bras. meteorol. [online]. 2012, vol.27, n.4, pp.475-483. ISSN 0102-7786.  http://dx.doi.org/10.1590/S0102-77862012000400010.

This study aims to present an atmospheric analysis of spatial and temporal variability of the Intertropical Convergence Zone (ITCZ) in Belem, Jakarta and Nairobi, which are located on the continents of South America, Asia and Africa, respectively. For this, daily precipitation and observed long wave radiation data for the period 1999 to 2008 were used, and mathematical and statistical techniques, such as the arithmetic mean and the Morlet wavelet transform were applied. In general, the results indicate that spatially, the month rainfall varies considerably, since that the three studied cities are located far apart in different continents in the tropical zone. This occurs mainly during the months from January to May, period of greatest activity of the ITCZ in the southern hemisphere. The atmospheric variations observed from the phase wavelet scalograms indicate that the interdecadal scales, annual, interannual and intraseasonal scales are rainfall modulators. Such scales can be represented by the ocean-atmosphere phenomenon mechanisms of El Niño Southern Oscillation and intraseasonal oscillation of Madden and Julian. The contribution of these phenomena to the rainfall distribution over these regions is evident during the study period, and Nairobi, in spite of being located at latitude similar to that of Belem, shows low evidence of the annual cycle and high at interdecadal scale. In the case of Belem and Jakarta oscillations at multiscale rainfall concentrated in the mechanisms scales that modulate the rain associated with the annual cycle and intraseasonal cycle during the period.

Palavras-chave : Climatology; ITCZ; Precipitation; Tropics.

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

 

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