scholarly journals Sulfurization of dissolved organic matter in the anoxic water column of the Black Sea

2021 ◽  
Vol 7 (25) ◽  
pp. eabf6199
Author(s):  
Gonzalo V. Gomez-Saez ◽  
Thorsten Dittmar ◽  
Moritz Holtappels ◽  
Anika M. Pohlabeln ◽  
Anna Lichtschlag ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Dissolved Organic Matter ◽  
Water Column ◽  
Black Sea ◽  
Large Scale ◽  
Global Climate ◽  
The Black Sea ◽  
Sulfur Species ◽  
Reduced Sulfur

Today’s oceans store as much dissolved organic carbon (DOC) in the water column as there is CO2 in the atmosphere, and as such dissolved organic matter (DOM) is an important component of the global carbon cycle. It was shown that in anoxic marine sediments, reduced sulfur species (e.g., H2S) abiotically react with organic matter, contributing to carbon preservation. It is not known whether such processes also contribute to preserving DOM in ocean waters. Here, we show DOM sulfurization within the sulfidic waters of the Black Sea, by combining elemental, isotopic, and molecular analyses. Dissolved organic sulfur (DOS) is formed largely in the water column and not derived from sediments or allochthonous nonmarine sources. Our findings suggest that during large-scale anoxic events, DOM may accumulate through abiotic reactions with reduced sulfur species, having long-lasting effects on global climate by enhancing organic carbon sequestration.

Analytical pyrolysis of suspended particulate organic matter from the Black Sea water column

2006 ◽  
Vol 53 (17-19) ◽  
pp. 1856-1874 ◽  
Author(s):  
Yeşim Çoban-Yıldız ◽  
Daniele Fabbri ◽  
Valentina Baravelli ◽  
Ivano Vassura ◽  
Ayşen Yılmaz ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Black Sea ◽  
Particulate Organic Matter ◽  
Sea Water ◽  
The Black Sea ◽  
Analytical Pyrolysis ◽  
Suspended Particulate ◽  
Suspended Particulate Organic Matter

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’.

Characterization of dissolved organic matter in the Black Sea by fluorescence spectroscopy

Nature ◽  
1990 ◽  
Vol 348 (6300) ◽  
pp. 432-435 ◽  
Author(s):  
Paula G. Coble ◽  
Sarah A. Green ◽  
Neil V. Blough ◽  
Robert B. Gagosian
Keyword(s):  
Organic Matter ◽  
Fluorescence Spectroscopy ◽  
Dissolved Organic Matter ◽  
Black Sea ◽  
The Black Sea

What Controls Atmospheric Oxygen Concentrations?

2017 ◽  
Author(s):  
Donald Eugene Canfield
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Black Sea ◽  
Atmospheric Oxygen ◽  
Fundamental Question ◽  
The Black Sea ◽  
Microbial Process ◽  
The Past ◽  
Carbon Burial ◽  
Organic Carbon Burial

This chapter deals with the fundamental question of why there is oxygen in the atmosphere at all. It seeks to identify the main processes controlling the oxygen concentration. Plants and cyanobacteria produce the oxygen, but it accumulates only because some of the original photosynthetically produced organic matter is buried and preserved in sediments. Another oxygen source is an anaerobic microbial process called sulfate reduction that respires organic matter using sulfate and produces sulfide. This process is quite common in nature but are most prominent in relatively isolated basins like the Black Sea, and in most marine sediments at depths where oxygen has been consumed by respiration. If there is iron around, the sulfide reacts with the iron, forming a mineral called pyrite. While organic carbon burial has been the main oxygen source to the atmosphere over the past several hundred million years, for some intervals further back in time, pyrite burial may well have dominated as an oxygen source.

Determination of the reduced sulfur species in the anoxic zone of the Black Sea: A comparison of the spectrophotometry and iodometry techniques

Oceanology ◽  
2012 ◽  
Vol 52 (2) ◽  
pp. 181-190 ◽  
Author(s):  
A. V. Dubinin ◽  
T. P. Demidova ◽  
V. V. Kremenetskii ◽  
N. M. Kokryatskaya ◽  
M. N. Rimskaya-Korsakova ◽  
...  
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Anoxic Zone ◽  
Sulfur Species ◽  
Reduced Sulfur
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