Core descriptions and bulk sedimentology of two sediment cores in outer Filchner Trough, Antarctica ...

• Main Authors: Arndt, Jan Erik, Hillenbrand, Claus-Dieter, Grobe, Hannes, Kuhn, Gerhard, Wacker, Lukas
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2017
• Subjects: Marine Geophysics @ AWI AWI_GeoPhy; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarctic; Arctic; Filchner Trough; Hannes; Ronne Ice Shelf; Weddell; Weddell Sea; Antarc*; Antarctica; Filchner Ronne Ice Shelf; Filchner-Ronne Ice Shelf; Ice Sheet; Ice Shelf; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.879870; https://doi.pangaea.de/10.1594/PANGAEA.879870

Previous reconstructions of ice-sheet changes in Antarctica's Weddell Sea sector since the Last Glacial Maximum (LGM) at 19-23 (calibrated) cal. kyr B.P. suffered from large uncertainties and were partly contradictory. As a consequence, the contribution of this sector to the LGM sea-level low stand and post-LGM sea-level rise was unclear. Furthermore, whether and how precursor water masses for Antarctic Bottom Water (AABW) were formed in the Weddell Sea Embayment under glacial conditions is unknown, as this today requires the existence of the floating Filchner-Ronne Ice Shelf. Here we present new marine geophysical and marine geological data from the outer shelf section of the Filchner paleo-ice stream trough documenting that grounded ice had advanced onto and retreated from the outer shelf prior to 27.5 cal. kyr B.P., i.e., more than 4,500 years before the LGM. The data reveal the presence of a stacked grounding-zone wedge (GZW) just south of 75°30' S. This GZW was formed during two episodes of ... : Supplement to: Arndt, Jan Erik; Hillenbrand, Claus-Dieter; Grobe, Hannes; Kuhn, Gerhard; Wacker, Lukas (2017): Evidence for a dynamic grounding-line in outer Filchner Trough, Antarctica, until the early Holocene. Geology, 45(11), 1035-1038 ...