中国热带珊瑚礁的第四纪气候记录

珊瑚礁剖面的氧碳同位素、地球化学、造礁珊瑚生长带等分析结果表明,珊瑚礁记录了第四纪气候波动的基本轮廓.早更新世总体趋暖,但至少有4个旋回.中更新世总体趋冷,但至少有7个旋回.晚更新世气候剧烈波动,但总体变化为两个前暖后冷的旋回.全新世为回暖-升温-降温的波动.历史时期约1 700 a来有4个前冷后暖的旋回.近200 a的气候波动表现为前百年正距平,后百年以负距平为主,但总体趋暖.

A Discussion on the Quaternary Climate Record from the Coral Reef in Tropical China

The results of the analysis of oxygen isotope, carbon isotope, geochemistry and the growth belt of reef coral etc. for some profiles of coral reef show that the basic pattern of climatic fluctuation during the Quaternary period can be reflected by coral reef. The tendency of climate change was from cooling to warming during the period of Early Pleistocene with four cycles at least, and from warming to cooling with seven cycles at least during the period of Middle Pleistocene. Late Pleistocene as a period of Quaternary showed the most frequent climate fluctuation but generally two main cycles with anterior warming and posterior cooling can be seen. During Holocene, the climate went through a process from warming-temperature-rise to temperature-drop. During historical period, there were four cycles with anterior cooling and posterior warming since 1,700 a BP. During the last 200 years, the climate change is characterized by two stages, the positive deviation in the former 100 years, and negative deviation in the latter 100 years with general tendency of warming.