SOME CHARACTERISTICS OF THE CLIMATIC CHANGES DURING THE HISTORICAL TIME OF QINGHAI-XIZANG PLATEAU

Based on tree-ring data, records of meteorological observations, historical literature, pollen records and others, this paper analyzed the state of climatic change for last thousands of years of the plateau. It may be divided into five significant periods. The chief characteristics of climatic changes were analyzed. First, the certain basic features of the climatic variation of the plateau are similar to other zones of Northern Hemisphere, especially, close to those of East China. Secondly, according to the variability analysis, it can be shown that the plateau is the area of high variability. We have calculated two kinds of stability. All results show that Qinghai-Xizang plateau belongs to the sensitive area to climatic changes within the same latitude zone. Besides, by carrying out analysis on various series, we found some periodicities in climatic change of the plateau.