A PRELIMINARY STUDY ON THE CLIMATIC FLUCTUATIONS DURING THE LAST 5,000 YEARS IN CHINA
CHU KO-CHEN (CO-CHING CHU) (Academia Sinica)
The world climate during the historical times fluctuated. The numerous Chinese historical writings provide us excellent references in studying the ancient climate of China. The present author testifies, by the materials got from the histories and excavations, that during Yin-Hsu at Anyang, the ammal temperature was about 2℃ higher than that of the, present in most of the time. After that came a series of up and down swings of 2—3℃ with minimum temperatures occurring at approximately 100 B. C. (about the end of the Yin Dynasty and the beginning of the Chou Dynasty), 400 A. D. (the Six Dynasties), 1200 A. D. (the South Snug Dynasty), and 1700 A. D. (abont the end of the Ming Dynasty and the beginning of the Ching Dynasty). In the Han and the Tang Dynasties (200 B. C.—220 A. D. and 600—900 A. D.) the climate was rather warm. When the world climate turned colder than usual, it tended to begin at the Pacific coast of Eastern Asia, propagating as a wave westward, through Japan and China, to the Atlantic coast of Europe and Africa. When the world temperature recovered, it tended to propagate eastward from the west. A fuller knowledge of lhe climatic fluctuations in historical times and a good grasp of their laws would render better service to the long-range forecasting in climate.