Origin of freshwater component in estuaries of the Ob and Yenisei Rivers and waters of Kara Sea adjacent zones based on isotopic (δD, δ18O) data

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Methods of estimation the isotopic parameters (δD, δ18O) of the freshwater component in the river-sea transition zone are considered in this work. This research is based on samples collected at the end of the summer season along two meridional sections laying from the estuaries of the Ob and Yenisei rivers to the center of the Kara Sea. The runoff of these rivers has contrasting isotopic parameters contrasting (δ18O = –15.0 ± 0.3‰, δD = –112.7 ± 2.1‰ for the Ob and δ18O = –18.9 ± 0.6‰, δD = –142.2 ± 4.3‰ for the Yenisei). It has been established that river waters located within the surface layer of sea water do not have time to homogenize: in the center of the Ob-Yenisei plume, the part of Ob waters is 60%. Within river estuaries, FC is homogeneous only in the upper layer of water (less than 5 m); with depth, variations in δ18O(FC) values reach 16‰ for the Ob Bay and 12‰ for the Yenisei Bay, exceeding the annual course of seasonal variations of this value in river water. In the bottom layer for the estuarine zones of both rivers, the presence of a total FC with light isotopic characteristics corresponding to regional atmospheric precipitation is observed, that FC is supplied to the estuary zone with the waters of the Kara Sea.

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Sobre autores

S. Kossova

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences

Autor responsável pela correspondência
Email: sonch_1@rambler.ru
Rússia, Moscow

E. Dubinina

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences

Email: sonch_1@rambler.ru
Rússia, Moscow

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2. Fig. 1. Catchment areas of the Ob (I) and Yenisei (II) rivers, according to ArcticGRO data [16].

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3. Fig. 2. The location of the studied sections in the Kara Sea (flight 66 of the NIS Akademik Mstislav Keldysh). I – Ob section; II – Yenisei section.

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4. 3. Spatial distribution of salinity (S) and isotopic parameters (δ18O, δD) in the waters of the Ob (A, B, C) and Yenisei (D, E, F) sections.

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5. 4. Relationship of salinity and isotopic composition of hydrogen (A) and oxygen (B) in the waters of the studied sections.

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6. 5. The dependence of the values of δD (A) and δ18O (B) of the freshwater component on its content in the waters of the Ob and Yenisei sections. The dotted areas are waters with a PK content of less than 60% (I) and more than 60% (II).

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7. Fig. 6. The proportion of Ob River waters in the composition of the Ob-Yenisei plume in the area of its intersection with the Yenisei section.

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8. Fig. 7. Distribution of calculated values of δ18O of the freshwater component (PC) depending on the depth: (A) the Gulf of Ob, (B) the Yenisei Bay. The dotted line marks the range of variations in the values of δ18O of river water at the ArcticGRO observation stations [16] for the period from September 2015 to August 2016, which covers the annual interval preceding sampling. The maps show the southern sections of the studied sections located within the Gulf of Ob (A) and the Yenisei Bay (B).

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9. 8. Distribution of δ18O(PK) in the waters of the Gulf of Ob (A) and the Yenisei Bay (B). The arrows indicate the direction of the river flow.

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10. Fig. 9. Characteristics of freshwater components in the river-sea transition zone using the example of the Gulf of Ob and the Yenisei Bay at the end of July 2016.

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