The turbidity maximum zone of the Yenisei River (Siberia) and its impact on organic and inorganic proxies


Contact
cgebhardt [ at ] awi-bremerhaven.de

Abstract

A general overview of the processes taking place in the summer mixing zone of the fresh Yenisei River water with the marine waters of the Kara Sea is given in this study, with special emphasis on the interaction between bulk (total suspended matter), inorganic (Fe, Mn) and organic (suspended organic carbon, suspended nitrogen) proxies. Within the mixing zone, a zone of enhanced turbidity (maximum turbidity zone) was observed comparable to studies in other rivers. Flocculation of particles due to changes in salinity and hydrography cause this maximum turbidity zone, and resuspension additionally enhances the turbidity in the near-bottom layers. Organic matter behaves conservatively in the mixing zone in terms of its percentage of suspended matter. It, however, undergoes degradation as revealed by amino acid data. Inorganic, redox- and salinity-sensitive, proxies (Mn, Fe) behave non-conservatively. Dissolved iron is removed at low salinities (<2) due to precipitation of iron-oxyhydroxides and adsorption of manganese on suspended particles, enhancing the Mn/Al ratio of the suspended matter in the same zone. At higher salinities within the mixing zone, Fe/Al and Mn/Al ratios of the suspended particles are depleted due to resuspension of sediment with lower Fe/Al and Mn/Al ratios. Dissolved manganese concentrations are significantly higher in the near-bottom layers of the mixing zone due to release from the anoxic sediment. All things considered, the Yenisei River mixing zone shows patterns similar to other worlds rivers.



Item Type
Article
Authors
Divisions
Programs
Publication Status
Published
Eprint ID
13341
DOI 10.1016/j.ecss.2005.05.007

Cite as
Gebhardt, C. , Schoster, F. , Gaye-Haake, B. , Beeskow, B. , Rachold, V. , Unger, D. and Ittekkot, V. (2005): The turbidity maximum zone of the Yenisei River (Siberia) and its impact on organic and inorganic proxies , Estuarine Coastal and Shelf Science, 65 (1), pp. 61-73 . doi: 10.1016/j.ecss.2005.05.007


Download
[thumbnail of Fulltext]
Preview
PDF (Fulltext)
Geb2005c.pdf

Download (547kB) | Preview
Cite this document as:

Share
Add to AnyAdd to TwitterAdd to FacebookAdd to LinkedinAdd to PinterestAdd to Email


Citation

Research Platforms
N/A

Campaigns
N/A


Actions
Edit Item Edit Item