Varve chronology and high-resolution vegetation and climate dynamics in central Japan during the last glacial (ca. 15-50 kyr BP) derived from the Lake Suigetsu sediment record

东亚季风的高分辨率植被和气候档案仍然很少见，但对于更好地了解该区域过去和未来的环境动态、评估植被在冰期-间冰期气候变化中的作用以及验证气候模型是必要的。精确和准确的绝对年表对于所有这些目标都是至关重要的。陆地放射性碳测年的实际校准曲线是由目前追溯到大约12,500卡的树木年轮数据提供的。YR BP。我们拟议的项目将成为国际Suigetsu Varve Degrate项目(始于2006年7月)的重要组成部分，该项目正在研究来自日本的73.5米连续沉积物岩芯，覆盖最后150 KYR(SG06)。我们的主要目标是(I)建立一个限制于14C测年方法(~50KYR)的放射性碳定标模型，使用微观Varive计数(GFZ Potsam)和广泛的14C测年(由来自Orau Oxford和RCL East KilBride的合作伙伴提供，英国纽卡斯尔大学)；(Ii)对从每年层叠的SG06沉积物中恢复的不受水库影响的植物遗骸进行14C定标；(Ii)定量重建约10,000-50,000卡期间西太平洋地区的季风气候。使用来自SG06岩心的高分辨率花粉/植被和硅藻记录的YR BP(富柏林)。

High-resolution vegetation and climate archives from monsoonal E. Asia are still rare but necessary for better understanding of past and future environmental dynamics in the region, which hosts 30% of the world population; for evaluating the role of vegetation in glacial-interglacial climate variations; and for validating climate models. Precise and accurate absolute chronologies are essential for all these goals. The actual calibration curve for terrestrial radiocarbon dates is provided by tree ring data presently reaching back to ca. 12,500 cal. yr BP. Our proposed project should become an essential part of the international Lake Suigetsu Varved Sediment Project {started in July 2006) working on a 73.5-m continuous sediment core from Japan covering the last 150 kyr (SG06). Our main goals are (i) to establish a radiocarbon calibration model to the limit of 14C dating method (~ 50 kyr), using microscopic varve counting (GFZ Potsdam) and extensive 14C dating (provided by the cooperation partners from ORAU Oxford and RCL East Kilbride, University of Newcastle, UK) of plant remains free of reservoir effects recovered from annually laminated SG06 sediment; and (ii) to produce quantitative reconstruction of the monsoonal climate in the W. Pacific region during ca. 10,000-50,000 cal. yr BP using high-resolution pollen/vegetation and diatom records from the SG06 core (FU Berlin).