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24 March 1988, Volume 7 Issue 1   
  • SURFACE RADIATION BALANCE OVER QlNGHAI-XIZANG PLATEAU IN WINTER
  • Shen Zhibao;Liu Weimin
  • 1988 Vol. 7 (1): 1-8. 
  • Abstract ( ) PDF (561KB) ( )
  • An empirical formula for calculating surface radiation balance over Qinghai-Xizang Plateau in winter with the percentage of sunshine and surface albedo was established based on the observational data. Using this formula the simulations of the effects of the latitude, date, surface albedo and sunshine duration on the surface radiation balance were conducted. The results show that the surface radiative energy budget over Qinghai-Xizang Plateau in winter, either surplus or deficit, are dependent on the latitude and surface albedo, but the absolute values of surplus or deficit dependent on the cloud cover (or sunshine duration). In other words, the spatial distribution pattern of surface radiation balance over the plateau is decided on the geographic latitude and surface albedo, but the amounts of both positive and negative value areas are affected by cloud cover. Therefore the spatial distribution pattern of surface radiation balance over Qinghai-Xizang Plateau in winter consists of a basic pattern caused by the geographic conditions including latitude and surface natural properties and a adding disturbing pattern caused by snow cover. Two main disturbing areas were found, one is in Mt. Bayankala, the river head region of Yangtse River and Yellow River, another the grasslands in northern Xizang.
  • THE CLIMATE CHANGE OF QINGHAI-XIZANG PLATEAU AND ITS NEIGHBOURHOOD
  • Tang Maocang;Li Cunqiang;Zhang Jian
  • 1988 Vol. 7 (1): 39-49. 
  • Abstract ( ) PDF (674KB) ( )
  • In this paper, firstly we have discussed climate change of the Qinghai -Xizang Plateau during the recent thousand years. It is found that Qing-hai-Xizang Plateau is a climate change "source region" of the East Asia. The lapse rate of air temperature between the two stations Leh and Srina-gar and the rainfall anomaly (percent departure from normal) of those stations are closely related according to the data of about one hundred years. When air temperature is higher, the rainfall is more, and vice versa. These oscillating period is about 40 years. Secondly, the climate change of plateau and its neighbourhood in the recent 30 years is analyzed. We have found when the air temperature of Northern Hemisphere was dropping in the 1960's, the rainfall in the windwards side of the plateau was increasing and the rainfall in the lee side was getting less. Until the 1970's the rainfall in the desert was increasing due to the strengthening of wet monsoon over the north side of the plateau. Finally, according to the data analysis, it will be expected that the air temperature of the west part of China will go up, the rainfall will be rising by the east side of the plateau and go down in the west side up to the end of this centenary.