[M-IS05] Global climate change driven by the Southern Ocean and the Antarctic Ice Sheet

[MIS05-08] Paleoenvironmental reconstruction using lake sediment cores from Lake Nurume in Lützow Holm Bay

*Takeshige Ishiwa¹, Yuki Tokuda², Takuya Itaki³, Satoshi Sasaki⁴, Kota Katsuki⁴, Yusuke Suganuma^1,5 (1.National Institute of Polar Research, 2.Tottori University of Environmental Studies, 3.National Institute of Advanced Industrial Science and Technology, 4.Shimane University, 5.The Graduate University for Advanced Studies (SOKENDAI))

Keywords:East Antarctica, Lake sediments

Lake sediment in Antarctica is a useful archive for paleoenvironmental reconstruction as sea-level and ice-sheet change. Various sediment cores have been collected from a large number of lakes in Lützow Holm Bay, East Antarctica (e.g., Takano et al., 2012; Verleryen et al., 2017; Suganuma et al., 2018; Ishiwa et al., 2020). However, the previous studies generally used one core sample for each lake in most cases, and it is necessary to proceed with an analysis of multiple core samples to reconstruct detailed environmental changes in the lake. Lake Nurume at Langhovde, Lützow Holm Bay is isolated from the sea by ~1 m sill, and a perennial snow patch is well developed in the southeast of the lake. In the geomorphological survey of the 61st Japanese Antarctic Research Expedition, we collected four sediment cores in Lake Nurume and also measured water column profiles (e.g., salinity, temperature, and turbidity) and detailed lake bathymetry (Ishiwa et al., in press). We will present preliminary results of these cores, such as radiocarbon dating, XRF, X-ray CT scanning, and microfossils analysis of the cores. Combining geological settings and obtained results in Lake Nurume provides significant insight into paleoenvironmental reconstruction around Lützow Holm Bay. Moreover, the dataset will be a valuable archive of paleoenvironmental studies using lake sediments in Antarctica.