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We thank Cheng et al. for their interest in our paper “On linking climate to Chinese dynastic change: Spatial and temporal variations of of monsoonal rain” [1]. Our paper was written largely as a response to the suggestion made by Zhang P Z, et al. [2] that climate has a key role in affecting chapters of Chinese cultural history (e.g. the demise of the Tang, Yuan and Ming dynasties).
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光明山球粒陨石宇宙射线暴露年龄及气体保存年龄 总被引:1,自引:0,他引:1
光明山球粒陨石稀有气体同位素分析结果表明,宇宙成因核素3He,21Ne及38Ar的宇宙射线暴露年龄分别为 65, 80和 65 Ma,平均为 70 Ma,这是目前高铁普通球粒陨石(H群球粒陨石)中暴露年龄最高的陨石; K-Ar及 U, Th-4He气体保存年龄分别为(4230± 100)和(3300± 60) Ma.宇宙成因3He暴露年龄小于21Ne年龄,放射性成因 4He保存年龄小于40Ar年龄,表明该陨石在碰撞破裂脱离母体后 70 Ma的暴露期间,可能由于小的近日距轨道受到太阳加热,导致3He和4He的同步丢失. 相似文献
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Zhaoyu Zhu Teh-Lung Ku Shangde Luo Houyun Zhou Qizhong Wen Shijie Li Bingyuan Li Hongchun Li 《科学通报(英文版)》2001,46(10):862-867
The age of the clastic-clay sediments with varied content of carbonate in core TS95 taken from the Lake Tianshuihai in the
northwest of the Tibetan Plateau was determined successfully by using the total sample dissolution U-series isochron method
for the first time. With this method, the serial absolute timescale (isotope time scale) covered the last 240 ka in the main
body of the Tibetan Plateau with a sea level up to 4000 m is also established for the first time, thereby laying the foundation
for the research on the paleoclimate and palaeoenvironment in the Lake Tianshuihai region as well as the relationship between
evolution of the Tibetan Plateau and global changes. In addition to a brief introduction of the basic principles, the procedures
of experiments, and the results, this note also presents the adaptability and superiority of this method as well as its possible
problems. 相似文献
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On linking climate to Chinese dynastic change: Spatial and temporal variations of monsoonal rain 总被引:1,自引:0,他引:1
The causal correlation or linkage between the East Asian Monsoon (EAM) intensity and rise/fall of Chinese dynasties recently proposed by high-resolution paleoclimate reconstructions is examined in detail. Aside from many exceptions to the correlation, both instrumental and historical climate records show strong spatial variations of rainfall on annual-to-decadal scales over eastern China. The relationship between rainfall and EAM intensity also exhibits regional disparity. These observations suggest: (1) Ta... 相似文献
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