Publikationsdatum:
2024-02-02
Beschreibung:
Reconstructing past modes of ocean circulation is an essential task in paleoclimatology and paleoceanography. To this end, we combine two sedimentary proxies, Nd isotopes (epsilon-Nd) and the 231Pa/230Th ratio, both of which are not directly involved in the global carbon cycle, but allow the reconstruction of water mass provenance and provide information about the past strength of overturning circulation, respectively. In this study, combined 231Pa/230Th and epsilon-Nd down-core profiles from six Atlantic Ocean sediment cores are presented. The data set is complemented by the two available combined data sets from the literature. From this we derive a comprehensive picture of spatial and temporal patterns and the dynamic changes of the Atlantic Meridional Overturning Circulation over the past ~25 ka. Our results provide evidence for a consistent pattern of glacial/stadial advances of Southern Sourced Water along with a northward circulation mode for all cores in the deeper (〉3000 m) Atlantic. Results from shallower core sites support an active overturning cell of shoaled Northern Sourced Water during the LGM and the subsequent deglaciation. Furthermore, we report evidence for a short-lived period of intensified AMOC in the early Holocene.
Schlagwort(e):
177-1089A; 177-1089B; 306-U1313B; AGE; Amazon Fan; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Exp306; GeoB1515-1; GeoB1523-1; Gravity corer (Kiel type); Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Knorr; KNR140; KNR140-12JPC; KNR140-2-12JPC; Latitude of event; Leg177; Longitude of event; M16/2; M35/1; M35003-4; Meteor (1986); North Atlantic Climate 2; Ocean Drilling Program; ODP; Opal, biogenic silica; Opal, biogenic silica, error; PC; Piston corer; Protactinium-231; Protactinium-231, error, relative; Protactinium-231/Thorium-230 activity ratio; Protactinium-231/Thorium-230 activity ratio, error; Reference/source; Sample code/label; SL; South Atlantic Ocean; Thorium-230; Thorium-230, error, relative; Thorium-232; Thorium-232, error, relative; Uranium-238; Uranium-238, error, relative; ε-Neodymium; ε-Neodymium, error
Materialart:
Dataset
Format:
text/tab-separated-values, 2315 data points
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