MÃ rcio Emerson Passos ( born 6 December 1978 ) is a Brazilian-Qatari football player . MÃ rcio Passos de Albuquerque ( born December 6 , 1978 in Nova IguaÃ u , Brazil ) , also known as Emerson , is a Brazilian-Qatari football striker , who plays for Fluminense .