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Martínez Méndez, Gema; Hebbeln, Dierk; Mohtadi, Mahyar; Lamy, Frank; De Pol-Holz, Ricardo; Reyes-Macaya, D; Freudenthal, Tim (2013): Long sedimentary records of sediment cores from the Chilean margin. PANGAEA, https://doi.org/10.1594/PANGAEA.820619, Supplement to: Martínez Méndez, G et al. (2013): Changes in the advection of Antarctic Intermediate Water to the northern Chilean coast during the last 970 kyr. Paleoceanography, 28, 1-12, https://doi.org/10.1002/palo.20047

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Abstract:
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 considerable AAIW contribution during cold phases of interglacials and especially during glacials. Besides, we used three short sediment cores to reconstruct benthic d13C values from the AAIW core during the last glacial and found a d13C signature similar to today's. Assuming that this was the case also for the past 970 kyr, we demonstrate that sea level changes and latitudinal migrations of the AAIW formation site can only account for about 50% of the full range of past d13C increases at site GeoB15016 during cold periods. Other processes that could explain the remaining of the positive d13C anomalies are increases in glacial AAIW production and/or deeper convection of the AAIW with respect to preceding interglacials.
Coverage:
Median Latitude: -24.633531 * Median Longitude: -73.273993 * South-bound Latitude: -30.234667 * West-bound Longitude: -95.024550 * North-bound Latitude: 0.569890 * East-bound Longitude: -70.645833
Date/Time Start: 2010-11-10T12:12:00 * Date/Time End: 2010-11-26T14:16:00
Size:
11 datasets

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Datasets listed in this publication series

  1. Martínez Méndez, G; Hebbeln, D; Mohtadi, M et al. (2013): (Table S1) Offset table: offsets introduced between sections of GeoB15016-1 and -2 to optimize the visual fit between them. https://doi.org/10.1594/PANGAEA.820576
  2. Martínez Méndez, G; Hebbeln, D; Mohtadi, M et al. (2013): (Table S2) Correlation points between GeoB15016-1 and GeoB15016-2 and sections used in the final splice. https://doi.org/10.1594/PANGAEA.820612
  3. Martínez Méndez, G; Hebbeln, D; Mohtadi, M et al. (2013): (Table S3) Tie points between GeoB15005-1 and GeoB5016 d18Obenthic and LR04 d18Obenthic. https://doi.org/10.1594/PANGAEA.820618
  4. Martínez Méndez, G; Hebbeln, D; Mohtadi, M et al. (2013): 1 Ma Pacific Deep Water stack of benthic stable isotopes. https://doi.org/10.1594/PANGAEA.820569
  5. Martínez Méndez, G; Hebbeln, D; Mohtadi, M et al. (2013): GeoB15016 resampled to PDW stack resolution and d13C gradient (GeoB15016 minus PDW stack). https://doi.org/10.1594/PANGAEA.820567
  6. Martínez Méndez, G; Hebbeln, D; Mohtadi, M et al. (2013): Stable isotope measurements on benthic foraminifera of sediment core GeoB15005-1. https://doi.org/10.1594/PANGAEA.820511
  7. Martínez Méndez, G; Hebbeln, D; Mohtadi, M et al. (2013): Stable isotope measurements on benthic foraminifera of site GeoB15016. https://doi.org/10.1594/PANGAEA.820565
  8. Martínez Méndez, G; Hebbeln, D; Mohtadi, M et al. (2013): Water sample measurements of sediment core GeoB15004-1. https://doi.org/10.1594/PANGAEA.820536
  9. Martínez Méndez, G; Hebbeln, D; Mohtadi, M et al. (2013): Water sample measurements of sediment core GeoB15007-1. https://doi.org/10.1594/PANGAEA.820538
  10. Martínez Méndez, G; Hebbeln, D; Mohtadi, M et al. (2013): Water sample measurements of sediment core GeoB15011-1. https://doi.org/10.1594/PANGAEA.820557
  11. Martínez Méndez, G; Hebbeln, D; Mohtadi, M et al. (2013): Water sample measurements of sediment core GeoB15024-1. https://doi.org/10.1594/PANGAEA.820564