ABSORPTION OF DISSOLVED OXYGEN BY THE UPPER LAYER OF BOTTOM SEDIMENTS IN A SMALL LAKE DURING LATE WINTER
| Autor: | Nikolai Palshin, Galina Zdorovennova, Tatyana Efremova, Roman Zdorovennov, Galina Gavrilenko, Sergey Bogdanov, Sergey Volkov, Arkady Terzhevik |
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| Jazyk: | English<br />Russian |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Transactions of the Karelian Research Centre of the Russian Academy of Sciences, Iss 3, Pp 36-47 (2017) |
| Druh dokumentu: | article |
| ISSN: | 1997-3217 2312-4504 |
| DOI: | 10.17076/lim451 |
| Popis: | The results of measurements of dissolved oxygen in the vicinity of the water-sediment interface in a small mesotrophic Lake Vendyurskoe (Southern Karelia) at the end of the ice-covered period are reported. The measurements were carried out in April 2008 on 18 slope sites (depths from 2.5 m to 9.3 m), with a predominance of water-saturated silt. The content of dissolved oxygen decreased sharply at the contact with silt. The maximum oxygen gradient reached 9 (mgO2/l)/cm on the silt surface . The rate of oxygen consumption by the sediment was maximal at a depth of 6-8 m. This rate was 1.5 times lower in shallower and deeper areas. The amount of dissolved oxygen absorption by sediments was estimated based on the lake’s bathymetric curve. A comparison of our estimates with the measured dissolved oxygen content in the water column suggests that over 60 % of oxygen reduction is the result of absorption by silt and less than 40 % is due to the destruction of labile organic matter in the water column at the stage of winter stagnation. |
| Databáze: | Directory of Open Access Journals |
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