Pacific waters in the East Siberian Sea: identification by δ13С(DIC) and [DIC]

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Abstract

The estimates of the scale and distribution of Bering Sea waters in the Pacific sector of the Arctic Ocean were made using the high-precision data on the isotopic composition and concentration of dissolved inorganic carbon. Despite the fact that δ13С(DIC) and [DIC] are not classic conservative tracers, in the East Siberian Sea, which is a zone of active interaction of river runoff with sea waters, these parameters can indicate the presence of sea waters not only of Atlantic, but also of Pacific origin, similar to the waters of the Bering Sea. Using a three-component mixing model, the spatial distribution of Pacific, Atlantic and river waters along two sections of the East Siberian Sea was estimated. The Pacific component extends from east to west to approximately 160 degrees east longitude, and possibly further west, skirting Wrangel Island not only from the north, but also possibly from the south. In the East Siberian Sea, waters similar to the open sea Bering summer surface waters are found, which are carried to the northern shelf by the circular Bering Sea Current, and upper intermediate waters, which can enter the zone of the northern shelf of the sea due to upwelling or active mixing.

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About the authors

E. O. Dubinina

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

Author for correspondence.
Email: elenadelta@gmail.com

Corresponding Member of the RAS

Russian Federation, Moscow

S. A. Kossova

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

Email: elenadelta@gmail.com
Russian Federation, Moscow

A. A. Osadchiev

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

Email: elenadelta@gmail.com
Russian Federation, Moscow; Moscow

Yu. N. Chizhova

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

Email: elenadelta@gmail.com
Russian Federation, Moscow

A. S. Avdeenko

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

Email: elenadelta@gmail.com
Russian Federation, Moscow

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2. Fig. 1. Research area and station location – the Indigirsky and Kolyma sections in the East Siberian Sea and polygons in the Bering Sea (dotted line: 1 – the area of the Koryak shelf, 2 – the area of the Commander Islands). The blue arrows represent currents in the Bering Sea and neighboring waters (Tazoe et al., 2022; Nishioka et al., 2021, etc.), the green and red arrows represent streams of Atlantic and Pacific waters, respectively (Kinney et al., 2022).

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3. 2. Concentrations (a) and values of δ13C (b) of dissolved inorganic carbon in the main water masses of the western part of the Bering Sea (Dubinina et al., 2024). Water designations: BsSW – summer subsurface; DtW – winter; intermediate – MtW and BSSWt, deep – BSSWb and BSDW.

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4. 3. Two-component mixing of Lena, Indigirka and Kolyma river runoff with seawater of different origin. Designations: 1 – Kolyma section, 2 – Indigirsky section. Abbreviations of water names – see the text and Table 1. The filled field is the mixing interval with the intermediate waters of the Bering Sea.

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5. 4. Spatial distribution in the waters of the Indigirsky and Kolyma sections: a, b – the proportion of river waters (XRW) in the sample; c, d – the proportion of Pacific waters (ZPW) in the sample; e, f – the proportion of Pacific waters (fPW) in unsalted seawater.

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