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《Scientia Geographica Sinica》 2000-05
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Decadal Climatic Variations Indicated by Dulan Tree-Ring and the Comparison with Temperature Proxy Data from Other Regions of China during the Last 2000 Years

YANG Bao 1, KANG Xing cheng 2, SHI Ya feng 1,2 (Cold and Arid Regions Environment and Engineering Research Institnte, Chinese Academy of Sciences, Lanzhou Gansu 730000)  
Based on hig resolution tree ring data from Dulan area of Qinghai Province, five spells have been divided: the warm period before 230's A.D., the cold period between 240's A.D. and 800's A.D., the significantly warm period between 810's A.D. and 1070's, i.e.  Medieval Warm Period ", the cold period including the  Little Ice Age ”1420's-1870's and the warming period since 1880's. All the eleven coldest or warmest decades and several great abrupt changes took place before the Middle Ages, indicating that climatic system operated in great instability during the period 150'-1100's A.D.. Comparison of the tree ring data with other temperature proxy data from East China, Guliya ice core as well as the south of Qinghai Tibet Plateau shows that such great climatic events as Eastern Han warm period between the beginning of the 1st century and the previous fifty years of the third century, the cold period covering the span of Wei, Jin and the Southern and Northern Dynasties, the well known  Medieval Warm Period " as well as the Little Ice Age " appeared in such series as East China and Dulan area. Only the first two climatic events were recorded conspicuously in Guliya ice core while the Medieval Warm Period " and Little Ice Age " is far weaker. Also, the well defined Medieval Warm Period" didn't occur in the south of Qinghai Tibet Plateau. The warming since the 20th century is the warmest in the last 200 years in Guliya ice core, the second in Dulan area and East China, but it scarcely seems pronounced in the eastern part of Qinghai Tibet Plateau.
【Fund】: 中国科学院“九五”重大项目! (KZ95 1-A1-2 0 4-0 2 ;;KZ95 1-A1-4 0 2 -0 3)资助
【CateGory Index】: P532
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