Submarine groundwater discharge revealed by radium isotopes (Ra-223 and Ra-224) near a paleochannel on the Southern Brazilian continental shelf

  • Karina Kammer Attisano Universidade Federal do Rio Grande (FURG)
  • Isaac Rodrigues Santos Southern Cross University; Centre for Coastal Biogeochemistry; School of Environmental Science and Management (Lismore, NSW 2480, Australia)
  • Carlos Francisco Ferreira de Andrade Universidade Federal do Rio Grande (FURG)
  • Mariele Lopes de Paiva Universidade Federal do Rio Grande (FURG)
  • Idel Cristina Bigliardi Milani
  • Luis Felipe Hax Niencheski Universidade Federal do Rio Grande (FURG)
Keywords: Porewater, Subterranean estuary, Permeable sediments

Abstract

Submarine Groundwater Discharge (SGD) has been recognized as an important component of the ocean-continent interface. The few previous studies in Brazil have focused on nearshore areas. This paper explores SGD on the Southern Brazilian Continental Shelf using multiple lines of evidence that include radium isotopes, dissolved nutrients, and water mass observations. The results indicated that SGD may be occurring on the Continental Shelf in the Albardão region, near a paleochannel located 50 km offshore. This paleochannel may thus be a preferential pathway for the delivery of nutrient- and metal-enriched groundwater and porewater into continental shelf waters.

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Published
2013-09-01
How to Cite
Attisano, K., Santos, I., Andrade, C., Paiva, M., Milani, I., & Niencheski, L. (2013). Submarine groundwater discharge revealed by radium isotopes (Ra-223 and Ra-224) near a paleochannel on the Southern Brazilian continental shelf . Brazilian Journal of Oceanography, 61(3), 195-200. https://doi.org/10.1590/S1679-87592013000300004
Section
naodefinida