OLIVEIRA, J.COSTA, P.BRAGA, E.S.2014-07-152014-07-302014-07-152014-07-302006OLIVEIRA, J.; COSTA, P.; BRAGA, E.S. Seasonal variations of 222Rn and SGD fluxes to Ubatuba embayments, São Paulo. <b>Journal of Radioanalytical and Nuclear Chemistry</b>, v. 269, n. 3, p. p. 689-695, 2006. DOI: <a href="https://dx.doi.org/10.1007/s10967-006-0287-2">10.1007/s10967-006-0287-2</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/5365.0236-5731http://repositorio.ipen.br/handle/123456789/5365We describe here an application of excess 222Rn to estimate submarine groundwater discharge in a series of small embayments of Ubatuba, São Paulo State, Brazil. Excess 222Rn inventories obtained in 11 vertical profiles varied from (3.3±1.1)·103 to (19±5)·103 dpm·m-2. The estimated total fluxes required to support the inventories varied from (0.6±0.2)·103 to (3.4±0.9)·103 dpm·m-2·d-1. Considering these results, the submarine groundwater discharge advective rates necessary to balance the sub-pycnocline fluxes calculated in Ubatuba embayments ranged from 0.06 to 1.9 cm·d-1. During the period of this investigation (from March/03 to May/2004), the highest 222Rn in excess inventories were observed late in the summer season (March). Taking into account all vertical profiles established, the relative variability was 67%. Although, if we consider only the fluxes determined in both Flamengo and Fortaleza embayments, the relative variation was 21%.p. 689-695openAccessbrazilcoastal watersradon 222submarinesground waterseasonal variationsArtigo de periódico326910.1007/s10967-006-0287-2