Long sedimentary records of sediment cores from the Chilean margin ...

• Main Authors: Martínez Méndez, Gema, Hebbeln, Dierk, Mohtadi, Mahyar, Lamy, Frank, De Pol-Holz, Ricardo, Reyes-Macaya, Dharma, Freudenthal, Tim
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2013
• Subjects: Center for Marine Environmental Sciences MARUM; Antarc*; Antarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.820619; https://doi.pangaea.de/10.1594/PANGAEA.820619

The Antarctic Intermediate Water (AAIW) is a key player in global-scale oceanic overturning processes and an important conduit for heat, fresh water, and carbon transport. The AAIW past variability is poorly understood mainly due to the lack of sedimentary archives at intermediate water depths. We present records of benthic stable isotopes from sediments retrieved with the seafloor drill rig MARUM-MeBo at 956 m water depth off northern Chile (GeoB15016, 27°29.48'S, 71°07.58'W) that extend back to 970 ka. The sediments at this site are presently deposited at the boundary between AAIW and Pacific Deep Water (PDW). For previous peak interglacials, our results reveal similar benthic d13C values at site GeoB15016 and of a newly generated stack of benthic d13C from various deep Pacific cores representing the "average PDW." This suggests, unlike today, the absence of AAIW at the site and the presence of nearly pure PDW. In contrast, more positive d13C values at site GeoB15016 compared to the stack imply a ... : Supplement to: Martínez Méndez, Gema; Hebbeln, Dierk; Mohtadi, Mahyar; Lamy, Frank; De Pol-Holz, Ricardo; Reyes-Macaya, Dharma; Freudenthal, Tim (2013): Changes in the advection of Antarctic Intermediate Water to the northern Chilean coast during the last 970 kyr. Paleoceanography, 28, 1-12 ...