Geochemical Markers of Organic Matter Transformation in the Eastern Laptev Sea

The sources of supply and transformation of organic matter (OM) as it transitions from dissolved form to particulate matter, fluffy layer, and bottom sediments were investigated along a meridional transect from the Lena River delta to the continental slope (in the depth range of 10 to 2390 meters, c...

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Bibliographic Details
Published in:Oceanology (Washington. 1965) 2024-04, Vol.64 (2), p.237-249
Main Authors: Shulga, N. A., Romankevich, E. A., Vylegzhanina, N. V., Streltsova, E. A., Fedulov, V. Yu, Polyakova, A. V.
Format: Article
Language:English
Subjects:
Bottom sediments
Continental slope
Earth and Environmental Science
Earth Sciences
Marine Chemistry
Oceanography
Organic matter
Particulate matter
Particulate organic matter
River discharge
River flow
Rivers
Runoff
Sediment
Sediments
Suspended particulate matter
Water circulation
Water column
Water depth
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Summary:The sources of supply and transformation of organic matter (OM) as it transitions from dissolved form to particulate matter, fluffy layer, and bottom sediments were investigated along a meridional transect from the Lena River delta to the continental slope (in the depth range of 10 to 2390 meters, cruise 63 of the R/V Akademik Mstislav Keldysh , September 2015). The study of OM molecular markers showed that dissolved and particulate organic matter of marine and terrigenous origin biodegrades in the water column and accumulates insignificantly in bottom sediments. Thus, OM from Lena River runoff does not contribute to the formation of OM in bottom sediments in summer. An area of influence of under-ice blooms on the sedimentation process was identified on the outer shelf.
ISSN:0001-4370
1531-8508
DOI:10.1134/S0001437024020115