关于青藏高原隆起对中国气候影响的讨论

许多学者把高原隆起作为季风形成的必要条件,本文认为把在现代的位置上“削平”高原而模拟出的结果推广到早第三纪是不妥的。因为根据古地理和古地磁资料恢复的青藏高原早第三纪位置与现代有着巨大的差异。我们试图重建青藏高原隆起的动态模式,提出在早第三纪,中国已经存在古季风的初步认识,而青藏高原的隆起,只是使季风环流进一步加强,中国气候图式因高原隆起而趋于复杂化。

A DISCUSSION ON THE EFFECT OF QINGHAI TIBET PLATEAU SWELLING ON THE CLIMATE IN CHINA

Some scientists, in accordance with the imitation put forward by S.Mana-ble (1974) and his cooperators, believe that the swell of Qinghai-Tibet plateau is a prerequisite for the forming of the monsoon in East Asia and therefore, in the Eogene period before the swell of the plateau, there was no monsoon circulation in this area. We consider that it is a mistake of fixism to extend to the Eogene period the conduction which is deduced from the supposition that there were no the plateau at the present position. They have ignored that the positions of the sea-land and the latitude, the relative positions and areas in Eogene period are quite different from those at present. We reconstruct the dynamic imitation of the swell of the plateau based on the date of palaeogeography and palaeomagnetism. It represents the process during which the crust at the place of the present plateau was from both nearly north and south, more and more compressed, thickened and swelled under the squeeze of the Indian plate and with the Europe-Asia continent turning clockwise. In our opinion the first fachor in monsoon forming is the thermodynamic disparity between the sea and the land, the arising of the monsoon climate in China did not depend upon the plateau. The swell of the plateau in late tertiary period and especially in the Quaternary period, Only serengthened the-monsoon Circulation. As a result, the northern Limit of the subtropical zone in the east of China Ras been pushed southwards about five latitudes. The swell of the plateau has a direct bearing on some regional special climates and weather system. It has made the pattent of Climate in China more complicated.