Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM, supplement to: Lippold, Jörg; Luo, Yiming; Francois, Roger; Allen, Susan E; Gherardi, Jeanne-Marie; Pichat, Sylvain; Hickey, Ben M; Schulz, Hartmut (2012): Strength and geometry of the glacial Atlantic Meridional Overturning Circulation. Nature Geoscience, 5, 813-816

DOI

The strength and geometry of the Atlantic meridional overturning circulation is tightly coupled to climate on glacial-interglacial and millennial timescales, but has proved difficult to reconstruct, particularly for the Last Glacial Maximum. Today, the return flow from the northern North Atlantic to lower latitudes associated with the Atlantic meridional overturning circulation reaches down to approximately 4,000 m. In contrast, during the Last Glacial Maximum this return flow is thought to have occurred primarily at shallower depths. Measurements of sedimentary 231Pa/230Th have been used to reconstruct the strength of circulation in the North Atlantic Ocean, but the effects of biogenic silica on 231Pa/230Th-based estimates remain controversial. Here we use measurements of 231Pa/230Th ratios and biogenic silica in Holocene-aged Atlantic sediments and simulations with a two-dimensional scavenging model to demonstrate that the geometry and strength of the Atlantic meridional overturning circulation are the primary controls of 231Pa/230Th ratios in modern Atlantic sediments. For the glacial maximum, a simulation of Atlantic overturning with a shallow, but vigorous circulation and bulk water transport at around 2,000 m depth best matched observed glacial Atlantic 231Pa/230Th values. We estimate that the transport of intermediate water during the Last Glacial Maximum was at least as strong as deep water transport today.

231Pa/230Th and biogenic opal compilation of new and published data from the Holocene (in the range of 0 - 7 ka) and the Last Glacial Maximum (LGM) in the range of 19 - 24 ka. References for age models and published data are indicated in the last columns according to the list of references. Only 231Pa/230Th measurements by ICP-MS (or AMS) have been considered.

Identifier
DOI https://doi.org/10.1594/PANGAEA.788550
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Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.788550
Provenance
Creator Lippold, Jörg; Luo, Yiming; Francois, Roger; Allen, Susan E; Gherardi, Jeanne-Marie; Pichat, Sylvain; Hickey, Ben M; Schulz, Hartmut
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2012
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 1444 data points
Discipline Earth System Research
Spatial Coverage (-76.330W, -53.300S, 25.500E, 60.582N); North Atlantic Ocean; Carolina Slope, North Atlantic Ocean; Blake Outer Ridge, North Atlantic Ocean; Blake-Bahama Outer Ridge, North Atlantic Ocean; South Atlantic Ocean; South Atlantic; Amazon Fan; Namibia continental slope; Argentine Basin; Brazil Basin; Northern Cape Basin; Atlantic Caribbean Margin; Southern Ocean; Iceland; Reykjanes Ridge; Newfoundland Slope; Azores; North Atlantic; Agulhas Ridge; Atlantic Ocean
Temporal Coverage Begin 1966-05-17T00:00:00Z
Temporal Coverage End 2005-06-15T13:51:00Z