O mínimo de oxigênio na costa leste do Brasil entre 7-22ºS

Abstract

SYNOPSISIn th~ South Atlantic nearly the Brazilian coast, at low latitudes, the layer of minimum oxygen concentration shows distinct values between the Equatorial region (7 0 S) and the region limited by latitudes of l8-22°S. In the vicinity of the Equator the minimum concentration is remarkably clear (2,0 ml/l at 7 0 S) and at 22°S the minima values raise up to 4.0-4.5'ml/l. The minimum oxygen layer follows the isopynics surfaces (Ot = 26.8-27.2) in depths of 300-400 m (7 0 S) and 600-800 m (22°S). The oxygen concentration in this area results from a biochemical and physical processes, due to the presence of poor water Brazil Current southward and the rich one Intermediate Antartic water flowing northward. INTRODUÇAOOs primeiros trabalhos sobre oxigênio dissolvido (OD) no Atlântico Sul aparecem em Seiwell -(1937)