Influence of Riverine Discharge and Timing of Ice Retreat on Particle Sedimentation Patterns on the Laptev Sea Shelf

Drits, A. V.; Pasternak, A. F.; Арашкевич, Е. Г.; Кравчишина, М. Д.; Sukhanova, I. N.; Сергеева, В. М.; Флинт, М. В.

doi:10.1029/2021jc017462

Cited by 10 publications

(5 citation statements)

References 73 publications

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“…Thus, setting a trap higher than 50 m is not always justified. Analyses of samples collected by a similar sedimentation trap show that the seasonal succession of large phytoplankton is well detected [41]. Using the data collected by such trap for study of picofraction of phytoplankton is justified and can be an estimate of the development of picoplankton throughout the entire water column, including the surface layer and the photic zone.…”

Section: Discussionmentioning

confidence: 99%

Seasonal Variability of Photosynthetic Microbial Eukaryotes (<3 µm) in the Kara Sea Revealed by 18S rDNA Metabarcoding of Sediment Trap Fluxes

Белевич

Milyutina

Troitsky

2021

Plants

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This survey is the first to explore the seasonal cycle of microbial eukaryote diversity (<3 µm) using the NGS method and a 10-month sediment trap (2018–2019). The long-term trap was deployed from September to June in the northwestern part of the Kara Sea. A water sample collected before the sediment trap was deployed and also analyzed. The taxonomic composition of microbial eukaryotes in the water sample significantly differed from sediment trap samples, characterized by a high abundance of Ciliophora reads and low abundance of Fungi while trap samples contained an order of magnitude less Ciliophora sequences and high contribution of Fungi. Photosynthetic eukaryotes (PEs) accounting for about 34% of total protists reads were assigned to five major divisions: Chlorophyta, Cryptophyta, Dinoflagellata, Haptophyta, and Ochrophyta. The domination of phototrophic algae was revealed in late autumn. Mamiellophyceae and Trebouxiophyceae were the predominant PEs in mostly all of the studied seasons. Micromonas polaris was constantly present throughout the September–June period in the PE community. The obtained results determine the seasonal dynamics of picoplankton in order to improve our understanding of their role in polar ecosystems.

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Section: Discussionmentioning

confidence: 99%

Seasonal Variability of Photosynthetic Microbial Eukaryotes (<3 µm) in the Kara Sea Revealed by 18S rDNA Metabarcoding of Sediment Trap Fluxes

Белевич

Milyutina

Troitsky

2021

Plants

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“…Additional sediment sampling at multiple sites will be necessary to capture the grain size, composition of minerals and organic material, and those spatial variabilities (e.g., Xiang & Lam, 2020;Yamamoto et al, 2017). Terrigenous material inflow from the major Arctic rivers such as the Lena and Mackenzie rivers is also considered an LM source in the Arctic Ocean (Drits et al, 2021;Juul-Pedersen et al, 2008;Lalande et al, 2009;O'Brien et al, 2006). Schwab et al (2021) detected similar isotopic values of Nd and Sr collected from sediment cores in the eastern Chukchi Borderland and the Mackenzie River.…”

Section: Summary Of Sensitivity Experimentsmentioning

confidence: 99%

Transport Processes of Seafloor Sediment From the Chukchi Shelf to the Western Arctic Basin

et al. 2022

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The processes of seafloor sediment transport from the Chukchi shelf to the western Arctic basin were investigated using a pan‐Arctic sea ice‐ocean model and sediment‐trap measurements at four mooring stations: North of Barrow Canyon, North of Hanna Canyon, Northwind Abyssal Plain, and Chukchi Abyssal Plain. The available sediment‐trap data verified that the sinking flux of lithogenic material (LM) originally resuspended from the seafloor for 2010–2020 was simulated reasonably well in the four mooring areas. The model results were analyzed to quantify the spatiotemporal variability of LM and to reveal its background mechanisms. Analysis indicated that the Barrow Canyon throughflow, Chukchi Slope Current (CSC), and mesoscale eddies played important roles in LM redistribution. The CSC controlled the westward transport of LM from the mouth of Barrow Canyon to the Chukchi Borderland. The mesoscale eddies generated north of Barrow Canyon efficiently transported shelf‐origin LM toward the southern Canada Basin. The sinking flux of particulate organic carbon (POC) averaged from September 2010 to August 2020, which was estimated statistically from the simulated LM flux, was 0.13–0.30 gC m−2 yr−1 at 200‐m depth in the southern Canada Basin. This finding reveals that lateral transport of sediment from the Chukchi shelf bottom has a considerable effect on the sinking flux of POC in the western Arctic basin, and suggests that the western Arctic marine biogeochemical cycle is strongly influenced by shelf‐basin exchange that depends on the relative strength of the CSC and mesoscale eddy activity.

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“…Coastal erosion and river discharge are the main sources of suspended sediment in the Laptev Sea, which were explicitly studied in previous works [22][23][24]. Horizontal and vertical transport of suspended matter within the sea is governed by the spreading and mixing of large river plumes, as well as coastal and shelf currents, which have large seasonal and inter-annual variability [25][26][27][28][29][30][31][32][33]. Entrainment of suspended matter by sea ice and its subsequent advection to the deep central part of the Arctic Ocean during the cold season is an important mechanism of the large-scale export of suspended sediments from the Laptev Sea [27,[34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Satellite-Based Evaluation of Submarine Permafrost Erosion at Shallow Offshore Areas in the Laptev Sea

Osadchiev,

Adamovskaya,

Myslenkov

et al. 2023

Remote Sensing

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Large areas of the seafloor in the Laptev Sea consist of submarine permafrost, which has experienced intense degradation over the last decades and centuries. Thermal abrasion of the submarine permafrost results in upward advection of suspended matter, which could reach the surface layer in shallow areas. This process is visually manifested through increased turbidity of the sea surface layer, which is regularly detected in optical satellite imagery of the study areas. In this study, satellite data, wind and wave reanalysis, as well as in situ measurements are analyzed in order to reveal the main mechanisms of seafloor erosion in shallow areas of the Laptev Sea. We describe the synoptic variability in erosion at the Vasilyevskaya and Semenovskaya shoals in response to wind and wave conditions. Finally, using reanalysis data, daily suspended matter flux from this area was evaluated during ice-free periods in 1979–2021, and its seasonal and inter-annual variabilities were described. The obtained results contribute to our understanding of subsea permafrost degradation, the sediment budget, and carbon and nutrient cycles in the Laptev Sea.

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Influence of Riverine Discharge and Timing of Ice Retreat on Particle Sedimentation Patterns on the Laptev Sea Shelf

Cited by 10 publications

References 73 publications

Seasonal Variability of Photosynthetic Microbial Eukaryotes (<3 µm) in the Kara Sea Revealed by 18S rDNA Metabarcoding of Sediment Trap Fluxes

Seasonal Variability of Photosynthetic Microbial Eukaryotes (<3 µm) in the Kara Sea Revealed by 18S rDNA Metabarcoding of Sediment Trap Fluxes

Transport Processes of Seafloor Sediment From the Chukchi Shelf to the Western Arctic Basin

Satellite-Based Evaluation of Submarine Permafrost Erosion at Shallow Offshore Areas in the Laptev Sea

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