关键词: 青海南部地区, 气候变化, 过去40a

Abstract: The annual, interannual and interdecadal variations of the climate in the south of Qinghai province have been analyzed by using the data of temperature, precipitation and perpetual snow during 1961-2003. The analyzed results are as follows: In this area, temperature increased the most remarkably in autumn, and this is different from that temperature increased the most remarkably in winter in other areas of northern China such as North China, Northeast China, and the east of Northwest China and Xinjiang area. Precipitation in winter and spring presented a trend of increase, but in summer and autumn it presented a trend of decrease. Perpetual snow on the ground increased by 15.1 cm and 3.8 cm in wintertime and springtime respectively, but it decreased by 0.3 cm and 0.2 cm in summer and autumn respectively. Therefore, on the one hand, climate warming, the increase of precipitation and perpetual snow in winter and spring was a direct reason that resulted in the increase of snow disaster during the period of 1980s and 1990s. And they caused more harm to agriculture and herd. On the other hand, the decrease of precipitation and perpetual snow in summer and autumn, temperature increasing, evaporation enhancing accelerated aridification and lack of water resources. They restrained the economic development of this area.

Key words: the south of Qinghai province, climate change, the past 40 years