The Evidences and the Causes for the Shift of Climate Pattern in Northwest China During This Century
TANG Mao cang, GAO Xiao qing, ZHU De qin(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou Gansu 730000, China)
Whether the climate in Northwest China is shifting or has been shifting are not only a scientific issue, but also an important factor to regional, even national, social-economical development and ecologic construction. Standing on the viewpoint of earth system, the issue on climatic shift has been discussed in this paper. After analyzing the periodicities of climate change in Northwest China by using data of Length of Solar Cycle, pollen and ice cores, it is found that the climate in Northwest China has completed the transferring from cold to warm, a new millenarian wet period will begin since 22 nd century, and the climate in the east part of Northwest China will turn to wet after 2020.