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

来自季风东亚的高分辨率植被和气候档案仍然很少，但对于更好地了解该地区过去和未来的环境动态是必要的，该地区拥有世界30%的人口；评价植被在冰期-间冰期气候变化中的作用；以及验证气候模型。精确和准确的绝对年表对实现所有这些目标至关重要。陆地放射性碳年代的实际校准曲线是由目前可追溯到约12,500 cal.yr BP的树木年轮数据提供的。我们提议的项目应该成为国际水越湖沉积项目（2006年7月开始）的重要组成部分，该项目从日本开始，覆盖过去150 kyr （SG06）的73.5米连续沉积物岩心。我们的主要目标是(i)建立一个放射性碳校准模型，以达到14C测年方法的极限（~ 50 kyr），使用显微值计数（GFZ波茨坦）和广泛的14C测年（由ORAU牛津和RCL东基尔布赖德的合作伙伴提供，英国纽卡斯尔大学），从每年层压的SG06沉积物中恢复的植物残留物中恢复的水库效应；（ii）利用SG06岩心的高分辨率花粉/植被和硅藻记录，定量重建约10,000-50,000 cal. yr BP期间西太平洋地区的季风气候（FU Berlin）。

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).