@Article{Portilho-RamosCBRMVSRVCS:2018:MeReSo,
author = "Portilho-Ramos, R. C. and Cruz, A. P. S. and Barbosa, C{\'a}tia
F. and Rathburn, A. E. and Mulitza, S. and Venancio, Igor Martins
and Schwenk, Tilmann and R{\"u}hlemann, C. and Vidal, L. and
Chiessi, Cristiano M. and Silveira, C. S.",
affiliation = "{University of Bremen} and {Universidade Federal Fluminense (UFF)}
and {Universidade Federal Fluminense (UFF)} and {California State
University Bakersfeld} and {University of Bremen} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {University of Bremen}
and {Federal Institute for Geosciences and Natural Resources} and
{Aix-Marseille University} and {Universidade de S{\~a}o Paulo
(USP)} and {Universidade Federal Fluminense (UFF)}",
title = "Methane release from the southern Brazilian margin during the last
glacial",
journal = "Scientific Reports",
year = "2018",
volume = "8",
pages = "e5948",
month = "Apr.",
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.",
doi = "10.1038/s41598-018-24420-0",
url = "http://dx.doi.org/10.1038/s41598-018-24420-0",
issn = "2045-2322",
targetfile = "portilho_methane.pdf",
urlaccessdate = "16 jun. 2024"
}