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《Plateau Meteorology》 2003-04
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Dry and Wet Climatic Changes of Western China in Recent 300 Years

LI Yi\|lin,XU Yuan, QIAN Wei\|hong(Department of Atmospheric Science, School of Physics, Peking University, Beijing 100871, China)  
The ice core and the tree ring proxy data are employed to analyze the temporal and spacial characteristics of dry and wet climatic changes in western China in recent 300 years. The results show that in whole western China, the dry and wet climatic changes appear a significant quasi\|70 year period changes. In most of the region, the quasi\|30 and quasi\|110 year periods are fairly significant as well. Before the year 1850 and according to the quasi\|70 year period, the eastern part of the Tibet Plateau and Xinjiang region almost are in the same dry and wet phases. They can be classified into one humidity belt. Namely both humidity belts, the Xinjiang and the western part of the Plateau, have a dipole relationship. But after that year, the Xinjiang changes gradually into the simultaneous phase with the western part of the Plateau, but it is not as good as the relationship between Xinjiang and the eastern part of the Plateau again yet. In other words after the year 1850, the western part of the Plateau and Xinjiang are grouped into the same humidity belt, not the eastern part of the Plateau again, now both the west and east of Xinjiang construct a new dipole. Up to recent decade, it is likely to appear that the western and eastern parts of the Plateau change into a simultaneous phase and a new dipole is constructed with Xinjiang. But because of the boundary effects of the wavelet transform, the reliability can be doubted. Anyhow, the drift of the dipole relationship among above three regions is very interesting, it is likely the drift of climate. In the situation of quasi\|110 year change, the main part of the Plateau and the Hua mountain compose one humidity belt, before the year 1850 period, the Plateau and Xinjiang take fairly the same phase; after the climatic abrupt change of the end of 19th century, the north part of the Plateau and Xinjiang show a relationship of dipole. on quasi\|30 year period scale, the phase of the Plateau and Xinjiang are almost identical.
【Fund】: 国家重点基础研究发展规划项目(G1999043405)资助
【CateGory Index】: P468.023
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