中国热带第四纪气候波动的海陆对比

COMPARISON OF QUATERNARY CLIMATE FLUCTUATION BETWEEN SEA AREA AND LAND AREA IN CHINA′S TROPICS

古气候分析典型实例的对比,表明中国热带第四纪的气候波动,海域与陆域的差异主要出现在早、中更新世及末次盛冰期,而晚更新世以来直至历史时期,海陆的气候波动基本同步。中国热带万年尺度的气候变化,既受地球轨道参数的驱动,亦受季风环流的影响;千年和百年尺度的气候变化,与太阳常数本身的变化有关。

The characteristics of phase, amplitude and cycle of Quaternary climate are of comparable and synchronous between sea area and land area showing the response of Quaternary climate to the global change in China＇s tropics.The climatic fluctuation with scale of ten thousand years in sea and land areas was drived not only by the change of orbital parameter but also by monsoon circulation.The formation and development of monsoon circulation was related to the uphft stages of Tibetan Plateau.The mechanism of climatic fluctuation with scale of millenium years and hundred years may be due to the variation of solar constant itself. The differentiation of climatic fluctuation between sea and land can be enumerated as follows： the climatic transform from Pliocene to Early Pleistocene in sea area was not as clear as that in land area, the climate fluctuation during Middle Pleistocene in western tropics was inferior to that in eastern tropics, the amplitude of drop in temperature during the Last Glacial Maximum in sea area was smaller than that in land area especially in eastern tropics. The following facts indicate the similarity of climatic fluctuation between sea and land.The records about the Middle Pleistocene Revolution showing the suddenly cooling near by the boundary between Early Pleistocene and Middle Pleistocene can be seen both in sea and land.The similarity is more obvious since Late Pleistocene.For example, a series of climatic event occurred synchronously both in sea and land, such as the terminal point Ⅱ , division of periods of MIS5-MIS2 and stage of 5a-5e in MIS5, events of D/0 and H, the terminal point Ⅰ, cooling and warming during the Last Deglacial Period, the beginning of warming in Holocene, the cooling event of Younger Drays, Neoglaciation Ⅰ and Ⅱ ,as well as the cooling events during historical period.