中国北方最近2ka高分辨率玛珥湖10Be记录及太阳活动重建

沉积物中的宇宙成因核素10Be记录可以示踪太阳活动变化的历史，突破目前卫星观测所能获得的太阳黑子变化的时间范围，为进一步研究作为地球气候变化的重要外强迫因子的太阳活动变化历史提供科学数据，然而利用湖泊沉积物10Be记录重建晚全新世太阳活动变化历史的研究鲜有报道。本项目拟对我国北方四海龙湾玛珥湖沉积物晚全新世2ka时段进行高分辨率10Be浓度及其他代用指标的综合分析，明确沉积物中10Be的主要影响因素。采用数理统计分析等手段，去除湖泊10Be中包含的气候系统信号获得10Be产率信号，为未来进一步应用湖泊沉积物10Be重建太阳活动变化历史提供了新的思路与途径。根据获得的晚全新世2ka以来受太阳活动调制的10Be变化序列，完成我国北方2ka以来可靠的太阳活动重建，同时结合这一地区已有的古气候资料深入分析太阳活动对气候的可能影响，为理解数年-数十年尺度气候变化机制提供支持。

Over long timescales, quantitative information about past solar activity can only be obtained using a method based upon indirect proxies, such as the cosmogenic isotopes 10Be in natural stratified archives. It provides scientific data for further study of solar activity change history, which is an important external forcing factor of earth's climate change. However, there are few reports on the reconstruction of Late Holocene solar activity history recorded by 10Be in lake sediments..In the current proposal, we intend to carry out a 10Be tracer study on the sediments of Sihailongwan Maar Lake, northern China. To identify the main factors for 10Be in the sediment, we will comprehensively analysis the high resolution 10Be concentration and other climate proxies. And the yield signal of 10Be will be obtained after stripping off climatic signals by mathematical statistical analysis means, providing a new way to reconstruct the history of solar activity using lake sediment 10Be in the future. According to the 10Be variation sequences modulated by solar activity, the reliable solar activities will rebuild in northern China since 2ka. Together with pre-existing palaeoclimatic data, a deeper analysis will be performed to investigate potential climate impacts from the solar activity. These results will be provided new scientific cognition for the mechanisms of climate change upon time scales from years to decades.