This study documents multi-proxy data representing surface water productivity and AMS ¹⁴C dates of box (BC3) and gravity (GC2) cores in the Central Basin of the northwestern Ross Sea. Based on AMS ¹⁴C dates, a comparison of sediment properties between BC3 and GC2 reveals that BC3 records the complete Holocene (i.e., interglacial) history, which is correlated to the uppermost part of GC2. The lithostratigraphic succession of GC2 consists of the repetition of contrasting layers distinguished by the productivity proxies. In contrast to the uppermost sediment layer (i.e., interglacial), the subsurface sediment layer (i.e., deglacial) is distinctly characterized by very high biogenic components. Such pronounced biogenic remnants in the deglacial sediments are not explained exclusively by in situ enhanced productivity in the surface water. Our results, thus, suggest that eroded and reworked shelf sediments from a previous interglacial period enriched in biogenic components by the advancing ice sheet might be transported through the melt-water plumes from the grounding line to the Central Basin, to provide high geochemical properties of deglacial sediments. Thus, growth and retreat of the grounded ice sheet played an important role in glaciomarine sedimentation change in the Central Basin of the northwestern Ross Sea.

本研究记录了代表罗斯海西北部中央盆地地表水生产力和箱形 (BC3) 和重力 (GC2) 岩心AMS ¹⁴ C 日期的多代理数据。根据 AMS ¹⁴ C 日期，BC3 和 GC2 之间沉积物性质的比较表明，BC3 记录了完整的全新世（即间冰期）历史，这与 GC2 的最上部相关。GC2 的岩石地层序列由生产力指标所区分的对比层的重复组成。与最上层的沉积物层（即间冰期）相比，地下沉积层（即冰期）的特征是非常高的生物成分。冰消期沉积物中这种显着的生物成因残留物并不能完全解释为就地提高了地表水中的生产力。因此，我们的结果表明，来自前一个间冰期的侵蚀和重新加工的陆架沉积物，由于冰盖的推进而富含生物成分，可能会通过融水羽流从接地线输送到中央盆地，以提供高地球化学性质的冰川沉积物。由此可见，陆基冰盖的生长和退缩在罗斯海西北部中央盆地的冰川沉积变化中发挥了重要作用。