Shallow carbon storage in ancient buried thermokarst in the South Kara Sea

Abstract Geophysical data from the South Kara Sea reveal U-shaped erosional structures buried beneath the 50–250 m deep seafloor of the continental shelf across an area of ~32 000 km2. These structures are interpreted as thermokarst, formed in ancient yedoma terrains during Quaternary interglacial p...

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Autores principales:	Alexey Portnov, Jürgen Mienert, Monica Winsborrow, Karin Andreassen, Sunil Vadakkepuliyambatta, Peter Semenov, Valery Gataullin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Thermokarst Kara Sea Gas Hydrate Stability Zone (GHSZ) Yedoma Future Arctic Climate Medicine R Science Q
Acceso en línea:	https://doaj.org/article/be9c8b702e7347fcb64c72f95e2c50eb
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id	oai:doaj.org-article:be9c8b702e7347fcb64c72f95e2c50eb
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spelling	oai:doaj.org-article:be9c8b702e7347fcb64c72f95e2c50eb2021-12-02T15:08:48ZShallow carbon storage in ancient buried thermokarst in the South Kara Sea10.1038/s41598-018-32826-z2045-2322https://doaj.org/article/be9c8b702e7347fcb64c72f95e2c50eb2018-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-32826-zhttps://doaj.org/toc/2045-2322Abstract Geophysical data from the South Kara Sea reveal U-shaped erosional structures buried beneath the 50–250 m deep seafloor of the continental shelf across an area of ~32 000 km2. These structures are interpreted as thermokarst, formed in ancient yedoma terrains during Quaternary interglacial periods. Based on comparison to modern yedoma terrains, we suggest that these thermokarst features could have stored approximately 0.5 to 8 Gt carbon during past climate warmings. In the deeper parts of the South Kara Sea (>220 m water depth) the paleo thermokarst structures lie within the present day gas hydrate stability zone, with low bottom water temperatures −1.8 oC) keeping the gas hydrate system in equilibrium. These thermokarst structures and their carbon reservoirs remain stable beneath a Quaternary sediment blanket, yet are potentially sensitive to future Arctic climate changes.Alexey PortnovJürgen MienertMonica WinsborrowKarin AndreassenSunil VadakkepuliyambattaPeter SemenovValery GataullinNature PortfolioarticleThermokarstKara SeaGas Hydrate Stability Zone (GHSZ)YedomaFuture Arctic ClimateMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Thermokarst Kara Sea Gas Hydrate Stability Zone (GHSZ) Yedoma Future Arctic Climate Medicine R Science Q
spellingShingle	Thermokarst Kara Sea Gas Hydrate Stability Zone (GHSZ) Yedoma Future Arctic Climate Medicine R Science Q Alexey Portnov Jürgen Mienert Monica Winsborrow Karin Andreassen Sunil Vadakkepuliyambatta Peter Semenov Valery Gataullin Shallow carbon storage in ancient buried thermokarst in the South Kara Sea
description	Abstract Geophysical data from the South Kara Sea reveal U-shaped erosional structures buried beneath the 50–250 m deep seafloor of the continental shelf across an area of ~32 000 km2. These structures are interpreted as thermokarst, formed in ancient yedoma terrains during Quaternary interglacial periods. Based on comparison to modern yedoma terrains, we suggest that these thermokarst features could have stored approximately 0.5 to 8 Gt carbon during past climate warmings. In the deeper parts of the South Kara Sea (>220 m water depth) the paleo thermokarst structures lie within the present day gas hydrate stability zone, with low bottom water temperatures −1.8 oC) keeping the gas hydrate system in equilibrium. These thermokarst structures and their carbon reservoirs remain stable beneath a Quaternary sediment blanket, yet are potentially sensitive to future Arctic climate changes.
format	article
author	Alexey Portnov Jürgen Mienert Monica Winsborrow Karin Andreassen Sunil Vadakkepuliyambatta Peter Semenov Valery Gataullin
author_facet	Alexey Portnov Jürgen Mienert Monica Winsborrow Karin Andreassen Sunil Vadakkepuliyambatta Peter Semenov Valery Gataullin
author_sort	Alexey Portnov
title	Shallow carbon storage in ancient buried thermokarst in the South Kara Sea
title_short	Shallow carbon storage in ancient buried thermokarst in the South Kara Sea
title_full	Shallow carbon storage in ancient buried thermokarst in the South Kara Sea
title_fullStr	Shallow carbon storage in ancient buried thermokarst in the South Kara Sea
title_full_unstemmed	Shallow carbon storage in ancient buried thermokarst in the South Kara Sea
title_sort	shallow carbon storage in ancient buried thermokarst in the south kara sea
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/be9c8b702e7347fcb64c72f95e2c50eb
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Shallow carbon storage in ancient buried thermokarst in the South Kara Sea

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