Methane release from the southern Brazilian margin during the last glacial

Abstract Seafloor methane release can significantly affect the global carbon cycle and climate. Appreciable quantities of methane are stored in continental margin sediments as shallow gas and hydrate deposits, and changes in pressure, temperature and/or bottom-currents can liberate significant amoun...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	R. C. Portilho-Ramos, A. P. S. Cruz, C. F. Barbosa, A. E. Rathburn, S. Mulitza, I. M. Venancio, T. Schwenk, C. Rühlemann, L. Vidal, C. M. Chiessi, C. S. Silveira
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/512c9fe3e1874aaabca98e0c6a67664f
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:512c9fe3e1874aaabca98e0c6a67664f
record_format	dspace
spelling	oai:doaj.org-article:512c9fe3e1874aaabca98e0c6a67664f2021-12-02T15:07:50ZMethane release from the southern Brazilian margin during the last glacial10.1038/s41598-018-24420-02045-2322https://doaj.org/article/512c9fe3e1874aaabca98e0c6a67664f2018-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-24420-0https://doaj.org/toc/2045-2322Abstract Seafloor methane release can significantly affect the global carbon cycle and climate. Appreciable quantities of methane are stored in continental margin sediments as shallow gas and hydrate deposits, and changes in pressure, temperature and/or bottom-currents can liberate significant amounts of this greenhouse gas. Understanding the spatial and temporal dynamics of marine methane deposits and their relationships to environmental change are critical for assessing past and future carbon cycle and climate change. Here we present foraminiferal stable carbon isotope and sediment mineralogy records suggesting for the first time that seafloor methane release occurred along the southern Brazilian margin during the last glacial period (40–20 cal ka BP). Our results show that shallow gas deposits on the southern Brazilian margin responded to glacial−interglacial paleoceanographic changes releasing methane due to the synergy of sea level lowstand, warmer bottom waters and vigorous bottom currents during the last glacial period. High sea level during the Holocene resulted in an upslope shift of the Brazil Current, cooling the bottom waters and reducing bottom current strength, reducing methane emissions from the southern Brazilian margin.R. C. Portilho-RamosA. P. S. CruzC. F. BarbosaA. E. RathburnS. MulitzaI. M. VenancioT. SchwenkC. RühlemannL. VidalC. M. ChiessiC. S. SilveiraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q R. C. Portilho-Ramos A. P. S. Cruz C. F. Barbosa A. E. Rathburn S. Mulitza I. M. Venancio T. Schwenk C. Rühlemann L. Vidal C. M. Chiessi C. S. Silveira Methane release from the southern Brazilian margin during the last glacial
description	Abstract Seafloor methane release can significantly affect the global carbon cycle and climate. Appreciable quantities of methane are stored in continental margin sediments as shallow gas and hydrate deposits, and changes in pressure, temperature and/or bottom-currents can liberate significant amounts of this greenhouse gas. Understanding the spatial and temporal dynamics of marine methane deposits and their relationships to environmental change are critical for assessing past and future carbon cycle and climate change. Here we present foraminiferal stable carbon isotope and sediment mineralogy records suggesting for the first time that seafloor methane release occurred along the southern Brazilian margin during the last glacial period (40–20 cal ka BP). Our results show that shallow gas deposits on the southern Brazilian margin responded to glacial−interglacial paleoceanographic changes releasing methane due to the synergy of sea level lowstand, warmer bottom waters and vigorous bottom currents during the last glacial period. High sea level during the Holocene resulted in an upslope shift of the Brazil Current, cooling the bottom waters and reducing bottom current strength, reducing methane emissions from the southern Brazilian margin.
format	article
author	R. C. Portilho-Ramos A. P. S. Cruz C. F. Barbosa A. E. Rathburn S. Mulitza I. M. Venancio T. Schwenk C. Rühlemann L. Vidal C. M. Chiessi C. S. Silveira
author_facet	R. C. Portilho-Ramos A. P. S. Cruz C. F. Barbosa A. E. Rathburn S. Mulitza I. M. Venancio T. Schwenk C. Rühlemann L. Vidal C. M. Chiessi C. S. Silveira
author_sort	R. C. Portilho-Ramos
title	Methane release from the southern Brazilian margin during the last glacial
title_short	Methane release from the southern Brazilian margin during the last glacial
title_full	Methane release from the southern Brazilian margin during the last glacial
title_fullStr	Methane release from the southern Brazilian margin during the last glacial
title_full_unstemmed	Methane release from the southern Brazilian margin during the last glacial
title_sort	methane release from the southern brazilian margin during the last glacial
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/512c9fe3e1874aaabca98e0c6a67664f
work_keys_str_mv	AT rcportilhoramos methanereleasefromthesouthernbrazilianmarginduringthelastglacial AT apscruz methanereleasefromthesouthernbrazilianmarginduringthelastglacial AT cfbarbosa methanereleasefromthesouthernbrazilianmarginduringthelastglacial AT aerathburn methanereleasefromthesouthernbrazilianmarginduringthelastglacial AT smulitza methanereleasefromthesouthernbrazilianmarginduringthelastglacial AT imvenancio methanereleasefromthesouthernbrazilianmarginduringthelastglacial AT tschwenk methanereleasefromthesouthernbrazilianmarginduringthelastglacial AT cruhlemann methanereleasefromthesouthernbrazilianmarginduringthelastglacial AT lvidal methanereleasefromthesouthernbrazilianmarginduringthelastglacial AT cmchiessi methanereleasefromthesouthernbrazilianmarginduringthelastglacial AT cssilveira methanereleasefromthesouthernbrazilianmarginduringthelastglacial
_version_	1718388384228966400

Methane release from the southern Brazilian margin during the last glacial

Ejemplares similares