Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/95265
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Acid rock drainage and rock weathering in antarctica: Important sources for iron cycling in the southern ocean |
Autor: | Dold B.; González-Toril, Elena CSIC ORCID; Aguilera, Ángeles CSIC ORCID; López Pamo, Enrique; Cisternas, M. E.; Bucchi, F.; Amils, Ricardo CSIC ORCID | Fecha de publicación: | 2013 | Editor: | American Chemical Society | Citación: | Environmental Science and Technology 47: 6129- 6136 (2013) | Resumen: | Here we describe biogeochemical processes that lead to the generation of acid rock drainage (ARD) and rock weathering on the Antarctic landmass and describe why they are important sources of iron into the Antarctic Ocean. During three expeditions, 2009-2011, we examined three sites on the South Shetland Islands in Antarctica. Two of them displayed intensive sulfide mineralization and generated acidic (pH 3.2-4.5), iron-rich drainage waters (up to 1.78 mM Fe), which infiltrated as groundwater (as Fe2+) and as superficial runoff (as Fe3+) into the sea, the latter with the formation of schwertmannite in the sea-ice. The formation of ARD in the Antarctic was catalyzed by acid mine drainage microorganisms found in cold climates, including Acidithiobacillus ferrivorans and Thiobacillus plumbophilus. The dissolved iron (DFe) flux from rock weathering (nonmineralized control site) was calculated to be 0.45 × 109 g DFe yr-1 for the nowadays 5468 km of ice-free Antarctic rock coastline which is of the same order of magnitude as glacial or aeolian input to the Southern Ocean. Additionally, the two ARD sites alone liberate 0.026 and 0.057 × 109 g DFe yr-1 as point sources to the sea. The increased iron input correlates with increased phytoplankton production close to the source. This might even be enhanced in the future by a global warming scenario, and could be a process counterbalancing global warming. © 2013 American Chemical Society. | URI: | http://hdl.handle.net/10261/95265 | DOI: | 10.1021/es305141b | Identificadores: | doi: 10.1021/es305141b issn: 0013-936X |
Aparece en las colecciones: | (CBM) Artículos (CAB) Artículos |
Mostrar el registro completo
CORE Recommender
SCOPUSTM
Citations
57
checked on 21-abr-2024
WEB OF SCIENCETM
Citations
53
checked on 26-feb-2024
Page view(s)
411
checked on 24-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.