Abstract
This study was based on data obtained during the cruise 63 of the R/V Akademik Mstislav Keldysh in September 2015. We examine the features of the hydrochemical structure of the Lena River–Laptev Sea mixing zone. The studies were carried out in the eastern part of the Laptev Sea on a quasi-meridional transect, with the length of 710 km along 130°30' E. The distribution of dissolved oxygen, pH, alkalinity, major nutrients (phosphates, silicon, nitrate, and ammonium nitrogen), and chlorophyll a was analyzed. The relationship between the main hydrochemical parameters and chlorophyll a was considered. The distribution of hydrochemical parameters is similar to the data of previous studies: significant removal of silicon by waters of the Lena River (66.6 μM) with a moderate nitrate content (3.87 μM) and low concentration of mineral phosphorus (0.08 μM) in the area of strong influence of river runoff (salinity of 3.012 PSU). The presence of a near-bottom stagnant water zone in the part of research area affected by river runoff was detected. It is shown that the influx of mineral forms of nitrogen and phosphorus into the marine region of the Lena River delta occurs mostly as a result of nutrient recycling rather than due to the continental runoff.
Similar content being viewed by others
REFERENCES
A. B. Demidov, V. I. Gagarin, E. G. Arashkevich, et al., “Spatial variability of primary production and chlorophyll in the Laptev Sea in August–September,” Oceanology (Engl. Transl.) 59, 678–691 (2019).
A. B. Demidov, V. I. Gagarin, V. A. Artemiev, et al., “Vertical variability of primary production and features of the subsurface chlorophyll maximum in the Laptev Sea in August–September, 2015, 2017, and 2018,” Oceanology (Engl. Transl.) 60, 189–204 (2020).
M. M. Kozhov, Fresh Waters of Eastern Siberia: The Baikal, Angara, Vitim, Upper Stream of the Lena and Nizhnyaya Tunguska River Basins (Irkutsk Regional State Publ., Irkutsk, 1950) [in Russian].
A. P. Lisitsyn, “The marginal filter of the ocean,” Oceanology (Engl. Transl.) 34, 671–682 (1994).
P. N. Makkaveev, A. A. Polukhin, A. M. Seliverstova, et al., “Dissolved inorganic carbon in the estuarine area of the Lena River: results of expeditions in 2015 and 2017,” Oceanology (Engl. Transl.) 58, 525–536 (2018).
P. N. Makkaveev, A. A. Polukhin, A. M. Seliverstova, et al., “Dynamics of biogenic elements in the estuarine area of the Lena River: results of expeditions in 2015 and 2017,” Arkt.: Ekol. Ekon., No. 2 (30), 56–67 (2018).
S. A. Mosharov, A. B. Demidov, and U. V. Simakova, “Peculiarities of the primary production process in the Kara Sea at the end of the vegetation season,” Oceanology (Engl. Transl.) 56, 84–94 (2016).
S. A. Mosharov and V. M. Sergeeva, “Assessment of the functional state of marine phytoplankton by fluorescence and the ratio of the concentrations of pheophytin and chlorophyll a,” Vopr. Sovrem. Al’gol., No. 1 (16), 2018.
S. V. Pivovarov, Chemical Oceanography of the Russian Arctic Seas (Gidrometeoizdat, St. Petersburg, 2000) [in Russian].
I. I. Pipko, S. P. Pugach, O. V. Dudarev, et al., “Carbonate parameters of the Lena River: characteristics and distribution,” Geochem. Int. 48, 1131–1137 (2010).
Resources of Surface Waters of USSR, Vol. 17: The Lena-Indigirka Area, Ed. by M. S. Protas’ev (Gidrometeoizdat, Leningrad, 1972) [in Russian].
Guide for Chemical Analysis of Marine and Fresh Waters during Ecological Monitoring of Fishery Reservoirs and Regions of the World Ocean, Prospective for Commercial Fishery, Ed. by V. V. Sapozhnikov (VNIRO, Moscow, 2003) [in Russian].
A. A. Sokolov, Hydrography of the USSR (Gidrometeoizdat, Leningrad, 1952) [in Russian].
S. V. Stepanova, A. A. Polukhin, and A. V. Kostyleva, “Hydrochemical structure of the waters in the eastern part of the Laptev Sea in autumn 2015,” Oceanology (Engl. Transl.) 57, 58–64 (2017).
I. N. Sukhanova, M. V. Flint, E. Ju. Georgieva, et al., “The structure of phytoplankton communities in the eastern part of the Laptev Sea,” Oceanology (Engl. Transl.) 57, 75–90 (2017).
Estuarine-Delta Systems of Russia and China: Hydrological-Morphological Processes, Geomorphology, and Development, Ed. by V. N. Korotaev, (GEOS, Moscow, 2007) [in Russian].
L. G. Anderson, “DOC in the Arctic Ocean,” in Biogeochemistry of Marine Dissolved Organic Matter, Ed. by D. A. Hansell and C. A. Carlson (Academic, San Diego, 2002), pp. 665–683.
G. Cauwet and I. Sidorov, “The biogeochemistry of Lena River: organic carbon and nutrients distribution,” Mar. Chem. 53, 211–227 (1996).
T. R. Fisher, L. W. Harding Jr., D. W. Stanley, et al., “Phytoplankton, nutrients, and turbidity in the Chesapeake, Delaware, and Hudson estuaries,” Estuarine, Coastal Shelf Sci. 27, 61–93 (1988).
V. V. Gordeev, J. M. Martin, I. S. Sidorov, et al., “A reassessment of the Eurasian river input of water, sediment, major elements, and nutrients to the Arctic Ocean,” Am. Sci. 296, 664–691 (1996).
G. Guggenberger, A. Skoog, and D. N. Thomas, “Dissolved organic matter and nutrients in the Lena River, Siberian Arctic: characteristics and distribution,” Mar. Chem. 59, 301–309 (1998).
A.-S. Heiskanen and A. Keck, “Distribution and sinking rates of phytoplankton, detritus, and particulate biogenic silica in the Laptev Sea and Lena River (Arctic Siberia),” Mar. Chem. 53, 229–245 (1996).
O. Holm-Hansen and B. Riemann, “Chlorophyll a determination: improvements in methodology,” Oikos 30, 438–447 (1978).
G. Kattner, J. M. Lobbes, H. P. Fitznar, et al., “Tracing dissolved organic substances and nutrients from the Lena River through Laptev Sea (Arctic),” Mar. Chem. 65, 25–39 (1999).
R. J. Lara, V. Rachold, G. Kattner, et al., “Dissolved organic matter and nutrients in the Lena River, Siberian Arctic: characteristics and distribution,” Mar. Chem. 59, 301–309 (1998).
R. Létolle, J. M. Martin, A. J. Thomas, et al., “18O abundance and dissolved silicate in the Lena delta and Laptev Sea (Russia),” Mar. Chem. 43, 47–64 (1993).
J. M. Martin, D. M. Guan, F. Elbaz-Poulichet, et al., “Preliminary assessment of the distributions of some trace elements (As, Cd, Cu, Fe, Ni, Pb, and Zn) in a pristine aquatic environment: the Lena River estuary (Russia),” Mar. Chem. 43, 185–199 (1993).
S. Peulve, M.-A. Sicre, A. Saliot, et al., “Molecular characterization of suspended and sedimentary organic matter in an Arctic delta,” Limnol. Oceanogr. 41 (3), 488–497 (1996).
D. A. Pilgrim, “Measurement and estimation of the extinction coefficient in turbid estuarine waters,” Cont. Shelf Res. 7, 1425–1428 (1987).
Yu. I. Sorokin and P. Yu. Sorokin, “Plankton and primary production in the Lena River estuary and in the south-eastern Laptev Sea,” Estuarine, Coastal Shelf Sci. 43, 399–418 (1996).
ACKNOWLEDGMENTS
The authors are grateful to the head of the expedition M.V. Flint for the opportunity to participate on cruise 63 of the R/V Akademik Mstislav Keldysh; P.N. Makkaveev for help in carrying out the work and helpful discussions; and A.B. Demidov for the data on chlorophyll a and Secchi disk depth, as well as for the discussion of the material and valuable remarks. The authors thank the anonymous referee for careful reading of the manuscript and useful recommendations on presentation of the material.
Funding
The study was carried out as a part of the state task of IO RAS (topic no. 149-2019-0008) and was supported by the Russian Science Foundation (project no. 19-17-00196, processing of hydrochemical data) and the Russian Foundation for Basic Research (project no. 18-05-60069, processing of biological data).
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated by A. Bobrov
Rights and permissions
About this article
Cite this article
Kostyleva, A.V., Polukhin, A.A. & Stepanova, S.V. Hydrochemical Structural Patterns of the Lena River–Laptev Sea Mixing Zone in the Autumn Period. Oceanology 60, 735–741 (2020). https://doi.org/10.1134/S0001437020060053
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0001437020060053