Biogeochemical structure of the Laptev Sea in 2015-2020 associated with the River Lena plume

Frontiers in Marine Science

Marine Science

Lina Xie¹  Ivan Gangnus²  Julia Moiseeva³  Andrey Grinko³  Darya Purgina³  Anfisa Berezina⁴  Evgeniy Yakushev⁵  Alexander Osadchiev⁶  Igor Zhdanov⁶  Alexander Polukhin⁶  Zhenming Ge⁷  Irina Pipko⁸  Svetlana Pugach⁸  Oleg Dudarev⁸  Igor Semiletov⁹ 

[1] College of Ecology, Lishui University, Zhejiang, China;Section of Oceanography, Norwegian Institute for Water Research (NIVA), Oslo, Norway;State Key Laboratory of Estuarine and Coastal Research, Institute of Eco-Chongming, Center for Blue Carbon Science and Technology, East China Normal University, Shanghai, China;Faculty of Geography, M.Lomonosov Moscow State University (MSU), Moscow, Russia;Laboratory for Integrated Research of the Arctic System “land-shelf”, National Tomsk State Research University (TSU), Tomsk, Russia;Institute of Natural Resources, National Tomsk Polytechnic Research University (TPU), Tomsk, Russia;Section of Oceanography, Norwegian Institute for Water Research (NIVA), Oslo, Norway;Shirshov Institute of Oceanology, Russian Academy of Sciences (IORAS), Moscow, Russia;Section of Oceanography, Norwegian Institute for Water Research (NIVA), Oslo, Norway;V.I. Il’ichev Pacific Oceanological Institute, Russian Academy of Sciences, Far Eastern Branch (POI), Vladivostok, Russia;Laboratory for Integrated Research of the Arctic System “land-shelf”, National Tomsk State Research University (TSU), Tomsk, Russia;Shirshov Institute of Oceanology, Russian Academy of Sciences (IORAS), Moscow, Russia;State Key Laboratory of Estuarine and Coastal Research, Institute of Eco-Chongming, Center for Blue Carbon Science and Technology, East China Normal University, Shanghai, China;V.I. Il’ichev Pacific Oceanological Institute, Russian Academy of Sciences, Far Eastern Branch (POI), Vladivostok, Russia;V.I. Il’ichev Pacific Oceanological Institute, Russian Academy of Sciences, Far Eastern Branch (POI), Vladivostok, Russia;Laboratory for Integrated Research of the Arctic System “land-shelf”, National Tomsk State Research University (TSU), Tomsk, Russia;Institute of Natural Resources, National Tomsk Polytechnic Research University (TPU), Tomsk, Russia;

关键词: Laptev Sea;    Lena River;    hydrophysical structure;    biogeochemical structure;    water mass;   

DOI  :  10.3389/fmars.2023.1180054

 received in 2023-03-05, accepted in 2023-05-04,  发布年份 2023

来源: Frontiers

【 摘 要 】

The discharge of rivers and the subsequent dispersion of their plumes play a pivotal role in the biogeochemical cycling of the Arctic Ocean. Based on the data collected during annual transects conducted in the autumn period (September-October) from 2015-2020, this study explores the effect of River Lena plume dispersion on the seasonal and interannual changes in the hydrophysical and biogeochemical structure of the southeastern Laptev Sea. The temperature-salinity relationship (T-S), Redfield ratio and multiparameter cluster analysis were used to investigate variations in the water mass structure along the transect. The results revealed that the plume’s interannual and seasonal spreading patterns play a crucial role in regulating the local physical, biogeochemical, and biological processes in the southern Laptev Sea. During September-October, the hydrochemical water mass structure along the transects shifted from highly stratified to unstratified as the plume’s mixing intensity increased. Anomalous hydrochemical distributions were observed due to coastal upwelling, which was primarily characterized by high total alkalinity and nitrate levels, and low organic phosphorus, nitrite, and ammonia levels in the seawater. Wind and cold weather conditions drive deep vertical mixing of seawater, causing the resuspension of bottom sediment and the subsequent enrichment of bottom water by nutrients. Multi-parameter cluster analysis is used to describe the details of water mass structures in the highly dynamic southern Laptev Sea, with water mass structures typically undergoing significant changes within two weeks between September and October. The migration and transformation of water masses throughout the seasons are influenced by the volume of river discharge, fall-winter cooling, and atmospheric circulation patterns. Furthermore, the general atmospheric circulation is confirmed to be the primary cause of the interannual variation in the spread of the Lena River plume over the southeast Laptev Sea.

【 授权许可】

Unknown   
Copyright © 2023 Xie, Yakushev, Semiletov, Grinko, Gangnus, Berezina, Osadchiev, Zhdanov, Polukhin, Moiseeva, Purgina, Pipko, Pugach, Dudarev and Ge