(Figure 2) Diatom relative abundance of sediment core PS58/254-1 ...

• Main Authors: Konfirst, Matthew Alan, Scherer, Reed P, Hillenbrand, Claus-Dieter, Kuhn, Gerhard
• Format: Dataset
• Language: English
• Published: PANGAEA 2012
• Subjects: DEPTH, sediment/rock; AGE; Actinocyclus actinochilus; Actinocyclus ingens; Azpeitia tabularis; Chaetoceros spp.; Eucampia antarctica; Fragilariopsis curta; Fragilariopsis kerguelensis; Fragilariopsis separanda; Hemidiscus karstenii; Rhizosolenia spp.; Rouxia antarctica; Rouxia constricta; Thalassionema spp.; Thalassiosira elliptipora; Thalassiosira fasciculata; Thalassiosira gracilis; Thalassiosira lentiginosa; Thalassiosira oestrupii; Thalassiosira oliverana; Thalassiosira tetraoestrupii; Thalassiosira tetraoestrupii var. reimeri; Thalassiothrix antarctica; Distephanus speculum; Diatoms, reworked; Diatoms, total, per unit sediment mass; Diatoms, sea-ice; Diatoms, marine; Diatoms tropical/subtropical; Accumulation rate, mass; Piston corer BGR type; Counting, diatoms; Calculated; ANT-XVIII/5a; Polarstern; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Amundsen Sea; Antarctic; Island Bay; Pine Island Bay; Southern Ocean; West Antarctic Ice Sheet; Antarc*; Antarctica; Ice Sheet; Pine Island; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.779253; https://doi.pangaea.de/10.1594/PANGAEA.779253

The goal of this study is to assess the changes that have occurred during the Mid-Pleistocene Transition, an important transitional period in cryosphere evolution, by examining the siliceous microfossil record of sediments collected proximal to a major ice drainage outlet for the West Antarctic Ice Sheet. Core PS58/254 was collected from a sediment drift on the upper continental rise in the Amundsen Sea, directly offshore from Pine Island Bay, one of the three main discharge areas for the West Antarctic Ice Sheet (WAIS). Published data on physical properties, geochemical composition, grain size and clay mineral assemblages are complemented here by a high-resolution record (sample spacing 10 cm) of the siliceous microfossil assemblages (diatoms and silicoflagellates). Between 1200 ka and 621 ka, the assemblage is relatively diverse, with Actinocyclus ingens, Thalassiothrix antarctica and Fragilariopsis kerguelensis dominating the assemblages, but diatom abundance is variable from low to barren. Additionally, ... : Supplement to: Konfirst, Matthew Alan; Scherer, Reed P; Hillenbrand, Claus-Dieter; Kuhn, Gerhard (2012): A marine diatom record from the Amundsen Sea – Insights into oceanographic and climatic response to the Mid-Pleistocene Transition in the West Antarctic sector of the Southern Ocean. Marine Micropaleontology, 92-93, 40-51 ...