Dune whitening and inter-dune freshwater ponds in NE Brazil

Levin, Noam, Tsoar, Haim, Maia, Luis P., Claudino-Sales, Vanda and Herrmann, Hans (2007) Dune whitening and inter-dune freshwater ponds in NE Brazil. Catena, 70 1: 1-15. doi:10.1016/j.catena.2006.06.006

Author Levin, Noam
Tsoar, Haim
Maia, Luis P.
Claudino-Sales, Vanda
Herrmann, Hans
Title Dune whitening and inter-dune freshwater ponds in NE Brazil
Journal name Catena   Check publisher's open access policy
ISSN 0341-8162
Publication date 2007-06-01
Year available 2006
Sub-type Article (original research)
DOI 10.1016/j.catena.2006.06.006
Open Access Status Not yet assessed
Volume 70
Issue 1
Start page 1
End page 15
Total pages 15
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract The changes in color of sand dunes from white to yellow or red is often interpreted to signify their age or their source materials. In this study we demonstrate the effect seasonal inter-dune freshwater ponds have on the bleaching of the color of sand dunes by iron reduction in the anaerobic conditions they create. By combining spectral measurements of field samples of dune sand together with the analysis of satellite images covering three dune fields in NE Brazil (Lençóis Maranhenses, Jericoacoara and Canoa Quebrada) we demonstrate its existence in the field. In areas where ponds cover 41% of the dune field (as in Lençóis Maranhenses) an almost total bleaching in the color of the sand occurs after which the dunes remain white with no relation to distance from the coastline. In areas with less ponds (e.g. Jericoacoara or Canoa Quebrada) dune whitening is less active, and there are areas where dune rubification occurs. As this process may have occurred in other dune fields during past climate conditions that may have been different from current ones, interpretations of dunes age based on their color should be handled with care.
Keyword Coastal dunes
Iron oxides
Remote sensing
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Geography, Planning and Environmental Management Publications
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Citation counts: TR Web of Science Citation Count  Cited 20 times in Thomson Reuters Web of Science Article | Citations
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