Mechanisms controlling the suboxic layer of the black sea

The Black Sea is a classic anoxic ocean basin resembling the earth's ancient oceanic conditions. Its present structure has evolved during the last 2.5 billion years, and is characterized by a well-defined sub-oxic zone at the interface between the oxic and sulfidic layers where many important b...

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Autor principal:	Oguz,Temel
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2006
Materias:	Black Sea ancient ocean conditions sub-oxia anoxia nitracline
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300012
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spelling	oai:scielo:S0717-653820060003000122007-10-30Mechanisms controlling the suboxic layer of the black seaOguz,Temel Black Sea ancient ocean conditions sub-oxia anoxia nitracline The Black Sea is a classic anoxic ocean basin resembling the earth's ancient oceanic conditions. Its present structure has evolved during the last 2.5 billion years, and is characterized by a well-defined sub-oxic zone at the interface between the oxic and sulfidic layers where many important bacterially-mediated redox reactions occur. The sub-oxic zone involves extremely low oxygen and sulfide concentrations with no perceptible vertical gradients. This is due to very strong density stratification along the sub-oxic and anoxic layers, which markedly restricts the downward flux of oxygen and upward flux of chemical properties and therefore maintains a stable structure with some inter-annual variations. The upper layer biogeochemical structure above the deep anoxic pool involves three distinct layers (Fig. 1). The biologically productive, oxic layer extends to the depth of nearly 50 m. About 90% of the sinking particles are remineralized inside this layer as well as in the subsequent 20-30 m deep "upper nitracline" zone. There, nitrate attains maximum concentrations around 8 µM, and is re-supplied to the surface layer to refuel the biological pump. Only a small fraction (~10%) of particulate matter sinks to the deeper anoxic part of the sea. This loss is however compensated by lateral nitrogen input mainly from the River Danube, by wet deposition and nitrogen fixation.info:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana (Concepción) v.70 suppl.1 20062006-10-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300012en10.4067/S0717-65382006000300012
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Black Sea ancient ocean conditions sub-oxia anoxia nitracline
spellingShingle	Black Sea ancient ocean conditions sub-oxia anoxia nitracline Oguz,Temel Mechanisms controlling the suboxic layer of the black sea
description	The Black Sea is a classic anoxic ocean basin resembling the earth's ancient oceanic conditions. Its present structure has evolved during the last 2.5 billion years, and is characterized by a well-defined sub-oxic zone at the interface between the oxic and sulfidic layers where many important bacterially-mediated redox reactions occur. The sub-oxic zone involves extremely low oxygen and sulfide concentrations with no perceptible vertical gradients. This is due to very strong density stratification along the sub-oxic and anoxic layers, which markedly restricts the downward flux of oxygen and upward flux of chemical properties and therefore maintains a stable structure with some inter-annual variations. The upper layer biogeochemical structure above the deep anoxic pool involves three distinct layers (Fig. 1). The biologically productive, oxic layer extends to the depth of nearly 50 m. About 90% of the sinking particles are remineralized inside this layer as well as in the subsequent 20-30 m deep "upper nitracline" zone. There, nitrate attains maximum concentrations around 8 µM, and is re-supplied to the surface layer to refuel the biological pump. Only a small fraction (~10%) of particulate matter sinks to the deeper anoxic part of the sea. This loss is however compensated by lateral nitrogen input mainly from the River Danube, by wet deposition and nitrogen fixation.
author	Oguz,Temel
author_facet	Oguz,Temel
author_sort	Oguz,Temel
title	Mechanisms controlling the suboxic layer of the black sea
title_short	Mechanisms controlling the suboxic layer of the black sea
title_full	Mechanisms controlling the suboxic layer of the black sea
title_fullStr	Mechanisms controlling the suboxic layer of the black sea
title_full_unstemmed	Mechanisms controlling the suboxic layer of the black sea
title_sort	mechanisms controlling the suboxic layer of the black sea
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2006
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300012
work_keys_str_mv	AT oguztemel mechanismscontrollingthesuboxiclayeroftheblacksea
_version_	1718442111050711040

Mechanisms controlling the suboxic layer of the black sea

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