Atlantic 231Pa/230Th and biogenic opal compilation of the Holocene and the LGM ...

• Main Authors: Lippold, Jörg, Luo, Yiming, Francois, Roger, Allen, Susan E, Gherardi, Jeanne-Marie, Pichat, Sylvain, Hickey, Ben M, Schulz, Hartmut
• Format: Dataset
• Language: English
• Published: PANGAEA 2012
• Subjects: Event label; Latitude of event; Longitude of event; AGE; DEPTH, sediment/rock; Depth, top/min; Depth, bottom/max; Sample code/label; Protactinium-231/Thorium-230 ratio; Protactinium-231/Thorium-230, error, relative; Opal, biogenic silica; Opal, biogenic silica, error, relative; Accumulation rate, opal; Accumulation rate, opal, error, relative; Reference/source; Piston corer; Drilling/drill rig; Gravity corer; Gravity corer Kiel type; Piston corer BGR type; Calypso Corer; DSDP/ODP/IODP sample designation; Leg162; Leg172; Leg177; M16/2; M20/2; M23/2; M34/2; M34/4; M65/1; KNR140; M45/5a; M35/1; MD128; MD173; MD101; ANT-XI/2; RC13; RC16; RC24; CEPAG; PALEOCINAT; SU92; V22; V30; Joides Resolution; Meteor 1986; Knorr; Marion Dufresne 1995; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.788550; https://doi.pangaea.de/10.1594/PANGAEA.788550

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 ... : 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. ...