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Tytuł:
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Identifying recent sources and fate of sedimentary nitrogen in the Baltic Sea based on organic matter elemental composition and nitrogen and carbon stable isotopes ratios.
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Autorzy:
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Winogradow A; Institute of Oceanology PAN, PO Box 197, Sopot, Poland. Electronic address: .
Pempkowiak J; Institute of Oceanology PAN, PO Box 197, Sopot, Poland.
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Źródło:
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Marine pollution bulletin [Mar Pollut Bull] 2020 Nov; Vol. 160, pp. 111622. Date of Electronic Publication: 2020 Sep 22.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Publication: 2003- : Oxford : Elsevier
Original Publication: London, Macmillan.
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MeSH Terms:
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Geologic Sediments*
Nitrogen*/analysis
Carbon/analysis ; Carbon Isotopes/analysis ; Environmental Monitoring ; Nitrogen Isotopes/analysis
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Contributed Indexing:
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Keywords: (210)Pb/(137)Cs dating; Deep depositional basins; Nitrogen burial; Nitrogen deposition; Shallow coastal areas
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Substance Nomenclature:
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0 (Carbon Isotopes)
0 (Nitrogen Isotopes)
7440-44-0 (Carbon)
N762921K75 (Nitrogen)
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Entry Date(s):
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Date Created: 20201113 Date Completed: 20201116 Latest Revision: 20201116
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Update Code:
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20240105
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DOI:
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10.1016/j.marpolbul.2020.111622
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PMID:
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33181920
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Sedimentary nitrogen (SN) provenience and fate in surface and subsurface sediments collected from the Baltic Sea were assessed. SN and sedimentary organic carbon (SOC) concentrations, stable isotopic signatures (δ 15 N SN and δ 13 C SOC ) and SOC/SN molar ratios, were determined in subsequent layers of twenty-four sediment cores dated with 210 Pb/ 137 Cs and fifty-seven surface sediments. Sedimentation rates in the range 66-736 g/m 2 yr -1 (0.05-0.34 cm/year) were measured. Prolonged incubation of sediments in the laboratory led to a 17-37% decrease of SN in surface sediments, and no SN loss in sediments deposited before 1940. Decrease of δ 15 N SN on incubation (1‰ on average), and gradients of δ 15 N SN , between recent - surface (3.5‰) vs. 100 years old - subsurface (2.1‰) sediments were attributed to varying contributions of labile nitrogen to the SN pool. Annual deposition of SN to sediment surface and burial in subsurface sediments amounted, respectively, to 5 ± 2 g/m 2 and 3.5 ± 1 g/m 2 .
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