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通过对云南寻甸仙人洞XR1石笋进行TIMS-U系测年、氧碳同位素、有机碳含量分析,重建了寻甸地区中全新世季风气候演化模式:(1)8.0~6.0ka B.P.为温暖湿润期;(2)6.0~5.1ka B.P.为气候突变期,气候由温湿变为冷干;(3)5.1~2.1ka B.P.为凉干期。通过石笋有机碳含量与石笋δ18O记录对比,认为石笋有机碳可以反映气候变化,但是存在滞后效应。最后,利用XR1石笋δ18O记录与北半球33°N太阳辐射量,本文初步分析了云南寻甸地区中全新世气候变化的驱动因素:寻甸地区中全新世气候的整体变化趋势受33°N太阳辐射量控制,同时受中全新世火山活动的影响。
Based on the TIMS-U dating, oxygen-carbon isotope and organic carbon content of the XR1 stalagmite in Xundian, Yunnan, the evolution of the Holocene monsoon climate in the Xundian area was reconstructed: (1) 8.0 ~ 6.0ka BP is warm and humid period ; (2) 6.0 ~ 5.1ka BP is a period of abrupt climate change, the climate changes from warm to humid; (3) 5.1 ~ 2.1ka BP is dry period. By comparing the organic carbon content of stalagmite with the δ18O records of stalagmite, it is considered that the organic carbon of stalagmite can reflect the climate change, but there is a hysteresis effect. Finally, using the δ18O records of XR1 stalagmite and the solar radiation of 33 ° N in the Northern Hemisphere, we analyzed the driving forces of the mid-Holocene climatic change in Xundian area of Yunnan: The overall mid-Holocene climatic changes in Xundian area are affected by 33 ° N solar radiation Volume control, at the same time by the Holocene volcanic activity.