摘要
中国热带早更新世气候波动以高频率小幅度为特征。“中更新世革命”发生在MIS20/MIS21之交。中更新世气候波动一般为三大旋回。晚更新世为两大旋回,但有变暖事件D/01~21及变冷事件H1~H6的表现。可以识别末次间冰期MIS5及其阶段5a^5e。末次亚间冰期有4~7次冷暖波动。末次冰期温度一般比今低1~2℃或3~5℃。终止点Ⅰ为15000~13670aB.P.。终止点Ⅱ为0.135~0.130MaB.P.。新冰期Ⅰ、Ⅱ、Ⅲ都有表现。历史时期出现南北朝冷期、北宋冷期、明清小冰期。近200a的气候,前百年升温,后百年降温。
The climatic fluctuation in Early Pleistocene is characterized by higher frequency and less amplitude with one or two main cycles in Chinese tropics. The＂Middle Pleistocene Revolution＂occurred nearby the boundary between MIS20 and MIS21. In general the climatic variation in Middle Pleistocene is of three main cycles. The main variation of climate is of two cycles in Late Pleistocene. The Last Subinterglacial Period of MIS3 is not a stable warm- humid period but there were 4～7 times of warning and cooling fluctuation. During the Last Glacial Period the largest amplitude of temperature drop is 5～9 ℃ in Taiwan Island, the second is 3 ～5 ℃ ,occurring in eastern tropics,and the minimum of 1～2 ℃ is only found in southern Yunnan. The drop amplitude in winter water temperature is relatively small in South China Sea, being 1～3 ℃. The beginning of the Last Glacial Period is 15 000～13 670 aB. P. , and fluctuations of the Oldest ,Old and Younger Dryas as well as Boiling and Allerod can be recognized. During Holocene the NeoglaciationⅠ（8 090～7 140 aB. P. ）, Ⅱ （5 300～4 000 aB. P. ） and Ⅲ（3 400～2 500 aB. P. ） can be observed. During historical times of past 2 000 a, two cooling stages occurred in 1 700～ 1 400 aB. P. and 1 100 ～800 aB. P. respectively. Based on the historical records about cold winter from 1245 to 1915,it has been found that the Little Ice Age began in 1485 and ended in 1897. From the growth rate of reef coral, it is deduced that during the recent 200 a, the sea water temperature has risen by fluctuation amplitude of 0.9 ℃ in the former 100 a but has dropped by 1.9 ℃ in the later 100 a. The climatic events in Chinese tropics are the response to the global change in some degree. The researches of regional climatic variation especially in land region should be strengthened. It is necessary to research the longitude zonation and comparison between sea and land because of the regional differentiation of climate change. It is effective to use the experimental analysis of oxygen isotope, carbon isotope, susceptibility and trace element etc.
出处
《地理与地理信息科学》
CSSCI
CSCD
北大核心
2005年第4期65-70,共6页
Geography and Geo-Information Science
基金
国家自然科学基金资助项目(40371015)
关键词
气候波动
第四纪
中国热带
climatic fluctuation
quaternary
Chinese tropics
