【摘要】 <正> 三十年代以来,特别是近年来,冰川、海洋以及第四纪地质各方面的研究,都已证明中国第四纪的气候存在着冰期、间冰期交替的演变规律。研究工作的进一步开展,要求对古气候作出定量的复原。可以证明我国第四纪气候存在着冷暖、干湿变化的古气候证据很多,但其中只有一部分能有定量意义;由于古气候标志本身的缺点,和可引以定量的标志又往往存在着多方面的不确切性,这就为复原带来了困难和分歧意见。更多还原

【Abstract】 Several climatic indicators such as the southern limits of paleaopermafrostsoil, the distribution of Tagai forest belt and the descending of snowline have been discussed, and it is estimated that during the Tall(Late Wurm)glaciation, the thermal condition of July was much like that of present May, and the mean annual temperature was 10—11℃(regions 40—50°N), 9℃(30—40°N), 5—8℃ (Tibet), 7℃ (South-Western China) and no more than 5℃ (South China) lower than now. For the southward shift of the strong zonal westerly jet streams and the monsoon from Indian and Pacific Oceans never crossed the Yangtze River even in summer, rainfall decreased evidently. It was only about 80% (between Yangtze and Nanling)to 30% (the great plains of North and North-eastern China)as much as to-day. The isotherms of mean temperatures are shown for the year, January and July in Fig 2, 3, 4 and the annual precipitation in Fig 5.更多还原