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《QUATERNARY SCIENCES》 1997-01
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THE LAST 1 835 YEARS CLIMATE CHANGES INFERRED FROM TREE RING RECORDS IN DULAN REGION, QINGHAI, CHINA

Kang Xingcheng(Lanzhou Institute of Glaciology and Geocryology, Chinese Academy of Sciences, Lanzhou 730000)L. J. Graumlich; P. Sheppard.(Laboratory of Tree -Ring Research, University of Arizona, Tucson, Arizona, USA)  
A 1 835-year tree ring chronology from the Qilian juniper (Sabina Przewalskii) is used to analyze the climate variability. Tree ring data from be cores were collected at the Ela mountains, ranging from 3 100~3700m level in the Dulan region, Qinghai province in the September, 1993. The studied arm is locate at the northeast of Tibetan Plateau,and between Kunlun and Qnghai-Nanshan mountains, with average elevation of above 3 500m The average annual precipitation of this region is 180 ~ 200mm and the annual mean temperature is 0.3℃, thus it is a typical dry, high sea level and cold area.The the ring wbes were cross-dated and measured using standard techniques. The tree ring chronology was compared diredtly to the monthly temperature and precipitation data from the closest Dulan meteorological observatory near the sampling sites. The correlation coefficient of the the ring chronology to mean temperatUre of September ~ November is 0.43, and that of 0.41 and 0.51 to May and June precipitation respectively.Therefore the the ring chronology can be used to infer the variations of cold and warm in the area. It was shown that there were 11 warm spells and 10 cold spells since 1 835 year, of which 819 ~ 1086 A. D. years is the longest warm period, lasting 268 years, and 623 ~ 818 A.D. years is the longest cold period, lasting 196 years. The durations of the warm period over 100 years have only 2 times, and the durations of the cold period over 100 years have 5 times. The results indicate that cold period was dominant in this arm in the past 1 835 years. The warm period of 819 ~ 1086 A. D. years (correspond with The Medieval Warm Period) was a touchline of climate variation in the area. Before the warm period,the conversion from cold to warm was rapid, but from cold to warm was sluggish.Furthermore, the warming trend started sinces The little Ice Age ended, which is keeping warm to the present.
【Fund】: 国际合作项目
【CateGory Index】: P467
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