Varve calibrated records of carbonate and organic carbon accumulation over the last 2000 years in the Black Sea

1994 ◽  
Vol 8 (2) ◽  
pp. 195-217 ◽  
Author(s):  
Michael A. Arthur ◽  
Walter E. Dean ◽  
Eric D. Neff ◽  
Bernward J. Hay ◽  
John King ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Black Sea ◽  
Carbon Accumulation ◽  
The Black Sea

scholarly journals Organic Carbon and Particle-Size Distribution in the Littoral Bottom Sediments of the Laspi Bay (the Black Sea)

2020 ◽  
Vol 27 (3) ◽  
Author(s):  
N. A. Orekhova ◽  
E. I. Ovsyany ◽  
◽  
Keyword(s):  
Organic Carbon ◽  
Black Sea ◽  
Bottom Sediments ◽  
Carbon Accumulation ◽  
Shelf Zone ◽  
The Black Sea ◽  
Geochemical Background ◽  
Anthropogenic Pressure ◽  
Lateral Migration ◽  
Two Samples

Purpose. The work is aimed at estimating the organic carbon abundance in the bottom sediments of the littoral zone in connection with the state of macrozoobenthos in the Sevastopol region coastal waters with different levels of the anthropogenic pressure (by the example of the Laspi Bay). Methods and Results. The samples were taken in the dynamically active coastal-shelf zone (up to the depths ~ 20 m) of the Laspi Bay in September, 2017. Two samples were taken during the 103rd cruise of R/V "Professor Vodyanitsky" (September, 2018). The geochemical composition of bottom sediments was investigated. The bottom sediments of natural humidity were analyzed in accordance with the requirements of the regulatory documents. In the sediments containing the aleurite fraction in the central part of the Laspi Bay (station 4), the organic carbon content (Сorg) increased its natural course up to 0.46 %, but did not exceed its maximum values characteristic of the similar lithological sediments in the shallow-water part of the Crimea Southern Coast (1.14 %). In the deep part of the bay occupied with the aleurite-pelitic silt, the Сorg content exceeded 2 %. Absence of the Сorg accumulation within the depths under study is conditioned primarily by the grain-size composition of the bottom sediments, the hydrodynamic factor and the morphometric features of this coastal site. Presence of a small portion of the aleurite-pelitic fraction in the bottom sediments also does not promote the organic carbon accumulation. Thus, spatial distribution of the carbon organic and inorganic forms is conditioned by the features of the matters’ lateral migration, which, in its turn, is governed by dependence of the bottom sediments’ chemical and dispersion structure upon the environmental morphodynamic conditions. Conclusions. The littoral sediments were found to be characterized by a low organic content (Сorg = 0.16 %) not exceeding the geochemical background values of the surface bottom sediments in the Black Sea shelf zones. At present, the organic matter accumulation is determined by the features of the environmental morphodynamic conditions (transition of fine particles to the deep zones) and by the dispersed composition of the bottom sediments.

scholarly journals Net removal of dissolved organic carbon in the anoxic waters of the Black Sea

2016 ◽  
Vol 183 ◽  
pp. 13-24 ◽  
Author(s):  
Andrew R. Margolin ◽  
Loes J.A. Gerringa ◽  
Dennis A. Hansell ◽  
Micha J.A. Rijkenberg
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Black Sea ◽  
The Black Sea ◽  
Anoxic Waters

scholarly journals Transfer of organic carbon through marine water columns to sediments – insights from stable and radiocarbon isotopes of lipid biomarkers

2014 ◽  
Vol 11 (23) ◽  
pp. 6895-6914 ◽  
Author(s):  
S. G. Wakeham ◽  
A. P. McNichol
Keyword(s):  
Organic Carbon ◽  
Mass Balance ◽  
Black Sea ◽  
Arabian Sea ◽  
Ross Sea ◽  
Vascular Plant ◽  
Sediment Traps ◽  
Lipid Biomarkers ◽  
The Black Sea ◽  
Marine Biomass

Abstract. Compound-specific 13C and 14C compositions of diverse lipid biomarkers (fatty acids, alkenones, hydrocarbons, sterols and fatty alcohols) were measured in sinking particulate matter collected in sediment traps and from underlying surface sediments in the Black Sea, the Arabian Sea and the Ross Sea. The goal was to develop a multiparameter approach to constrain relative inputs of organic carbon (OC) from marine biomass, terrigenous vascular-plant and relict-kerogen sources. Using an isotope mass balance, we calculate that marine biomass in sediment trap material from the Black Sea and Arabian Sea accounted for 66–100% of OC, with lower terrigenous (3–8%) and relict (4–16%) contributions. Marine biomass in sediments constituted lower proportions of OC (66–90%), with consequentially higher proportions of terrigenous and relict carbon (3–17 and 7–13%, respectively). Ross Sea data were insufficient to allow similar mass balance calculations. These results suggest that, whereas particulate organic carbon is overwhelmingly marine in origin, pre-aged allochthonous terrigenous and relict OC become proportionally more important in sediments, consistent with pre-aged OC being better preserved during vertical transport to and burial at the seafloor than the upper-ocean-derived marine OC.

Sulfur, iron and organic carbon fluxes in the Black Sea: sulfur isotopic evidence for origin of sulfur fluxes

1991 ◽  
Vol 38 ◽  
pp. S1151-S1187 ◽  
Author(s):  
Jo Ann Muramoto ◽  
Susumu Honjo ◽  
Brian Fry ◽  
Bernward J. Hay ◽  
Robert W. Howarth ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Black Sea ◽  
Carbon Fluxes ◽  
The Black Sea ◽  
Isotopic Evidence ◽  
Organic Carbon Fluxes

scholarly journals The oceanic budgets of nickel and zinc isotopes: the importance of sulfidic environments as illustrated by the Black Sea

2016 ◽  
Vol 374 (2081) ◽  
pp. 20150294 ◽  
Author(s):  
Derek Vance ◽  
Susan H. Little ◽  
Corey Archer ◽  
Vyllinniskii Cameron ◽  
Morten B. Andersen ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Water Column ◽  
Black Sea ◽  
The Black Sea ◽  
Zinc Isotopes ◽  
Trace Element Chemistry ◽  
Dissolved Species ◽  
Climatic Impacts ◽  
Sulfide Species ◽  
Equilibrium Fractionation

Isotopic data collected to date as part of the GEOTRACES and other programmes show that the oceanic dissolved pool is isotopically heavy relative to the inputs for zinc (Zn) and nickel (Ni). All Zn sinks measured until recently, and the only output yet measured for Ni, are isotopically heavier than the dissolved pool. This would require either a non-steady-state ocean or other unidentified sinks. Recently, isotopically light Zn has been measured in organic carbon-rich sediments from productive upwelling margins, providing a potential resolution of this issue, at least for Zn. However, the origin of the isotopically light sedimentary Zn signal is uncertain. Cellular uptake of isotopically light Zn followed by transfer to sediment does not appear to be a quantitatively important process. Here, we present Zn and Ni isotope data for the water column and sediments of the Black Sea. These data demonstrate that isotopically light Zn and Ni are extracted from the water column, probably through an equilibrium fractionation between different dissolved species followed by sequestration of light Zn and Ni in sulfide species to particulates and the sediment. We suggest that a similar, non-quantitative, process, operating in porewaters, explains the Zn data from organic carbon-rich sediments. This article is part of the themed issue ‘Biological and climatic impacts of ocean trace element chemistry’.

scholarly journals The effect of microorganisms and seasonal factors on the isotopic composition of particulate organic carbon from the black sea

Microbiology ◽  
2000 ◽  
Vol 69 (4) ◽  
pp. 449-459 ◽  
Author(s):  
M. V. Ivanov ◽  
A. Yu. Lein ◽  
Yu. M. Miller ◽  
S. K. Yusupov ◽  
N. V. Pimenov ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Isotopic Composition ◽  
Particulate Organic Carbon ◽  
Black Sea ◽  
The Black Sea ◽  
Seasonal Factors
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