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基于重庆地区黑风洞石笋HF01的~(230)Th年代数据、灰度数据、氧同位素数据和Fe含量数据,重建了长江中上游地区全新世季风变化历史。结果显示石笋HF01的灰度值主要响应东亚季风变化,石笋灰度序列能够记录东亚全新世季风气候变化历史,即全新世早中期东亚夏季风增强,在6 ka B.P.以后季风逐渐减弱。石笋HF01的灰度序列清晰地记录了一系列的Bond事件,显示石笋灰度值对气候环境变化敏感,是可靠的气候环境信息载体;也进一步证明东亚季风不仅受太阳辐射驱动,还受高纬地区千年尺度的气候变化影响。石笋HF01灰度序列功率谱所呈现的55 a周期与太平洋数10 a尺度涛动(PDO)的50~70a周期一致,45、25、23、22、18、12 a周期接近于太阳活动周期,说明在数十年至百年尺度上东亚季风可能受太平洋涛动和太阳活动的共同影响。
Based on the ~ (230) Th chronological data, grayscale data, oxygen isotope data and Fe content data from stratospheric HF01 in Batu Caves, Chongqing, the history of Holocene monsoon changes in the middle and upper reaches of the Yangtze River was reconstructed. The results show that the grayscale value of stalagmite HF01 mainly responds to the change of East Asian monsoon. The stalagmite gray-scale sequence can record the history of the East Asian monsoon climate change, that is, the early-mid-Holocene East Asian summer monsoon enhanced, and the monsoon gradually weakened after 6 ka BP. The grayscale sequence of stalagmite HF01 clearly records a series of Bond events, indicating that stalagmite grayscale value is sensitive to climate and environmental changes and is a reliable carrier of climate and environment information. It further proves that the East Asian monsoon is not only driven by solar radiation, but also affected by high latitudes Impact of climate change on the millennium scale in the region. The 55 a period presented by the power spectrum of grayscale HF01 grayscale coincides with the period of 50 ~ 70 a in the PDO of the Pacific Ocean. The 45, 25, 23, 22, 18, 12 a periods are close to the solar activity period, Indicating that the East Asian monsoon may be affected by the Pacific Ocean Oscillation and solar activity over decades or centuries.