Onset and termination of the late-glacial climate reversal in the high-resolution diatom and sedimentary records from the annually laminated SG06 core from Lake Suigetsu, Japan

摘要: High-resolution diatom, sediment and pollen analyses of two sections from the annually laminated SG06 core Lake Suigetsu were used to study onset termination late-glacial climate reversal in central Japan. Its broadly recognised counterpart is Younger Dryas or Greenland Stadial-1 (ca. 12.85–11.65 cal. kyr BP based on NGRIP ice records). Our suggests that accumulation analysed sediments occurred a deep relatively cold water meso-eutrophic lake with strong mixing regime high silica content. Combining these results together available pollen-based environmental reconstructions we suggest cooling, an intensified winter monsoon thicker snow cover could influence changes regional vegetation, sedimentation processes trophic status during transition last interstadial stadial around Suigetsu. A decrease total concentration increase Fagus percentage indicate local vegetation stress/disturbances cooling started at least 2–3 decades prior major shift inorganic (accumulation detrital layers) diatom assemblages (change Aulacoseira ambigua subarctica dominance), which took about 10 years. The Holocene again shows catchment area reacted first change, i.e. weakening accumulation. density reduced volume surface runoff associated melt supply likely responsible for soil erosion activity caused cessation layer consequent amount nutrients brought lowering nutrient status. latter process finally influenced assemblages, including return dominance A. ca. 30 years after virtual disappearance layers sediment. demonstrate rapid response system global subsequent warming, allow clear definition reversal. Despite fact more abrupt warm (and warm) environments than terrestrial records demonstrate, do not see any delayed change. This conclusion particular importance application record quantitative reconstruction.