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Climatic and environmental changes over the last millennium recorded in the Malan ice core from the northern Tibetan Plateau

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Science china Earth {1. 2006年第10期49卷 1079-1089页

作者： wang ninglian1,2. yao tandong2.1,{2., zhang yongliang1 & {5. weizhen1 1. key laboratory of cryosphere and Environment, cold and arid Regions {12. and engineering research {15., chinese academy of sciences, lanzhou 730000, china 2. {15. of Tibetan Plateau research, chinese academy of sciences, Beijing 100085. china 1. key {1. of {2. and Environment Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China 2. {1. of Tibetan Plateau research Chinese Academy of Sciences Beijing 100085 China

In this paper, climatic and environmental changes were reconstructed since 1.{1.A.D. based on the Malan ice core from Hol Xil, the northern Tibetan Plateau. The record of δ 1.O in the Malan ice core indicated that the warm-season air temperature variations displayed a general increase trend, the {1.th-century warming was within the range of natural climate variability, and the warmest century was the 1.th century while the warmest decade was the 1.1.s, over the entire study period. The “Medieval Warm Epoch” and “Little Ice Age” were also reflected by the ice core record. The dust ratio in the Malan ice core is a good proxy for dust event frequency. The 870-year record of the dust ratio showed that dust events occurred much frequently in the 1.th century. Comparing the variations of δ 1.O and the dust ratio, it is found that there was a strong negative correlation between them on the time scales of 1.1.1.{1.years. By analyses of all the climatic records of ice cores and tree rings from the northern Tibetan Plateau, it was revealed that dust events were more frequent in the cold and dry periods than in the warm and wet periods.

关键词： the Tibetan Plateau, the Malan ice core, climate changes, dust event frequency.

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Variations in air temperature during the last 1.0 years revealed by δ^(1.)O in the Malan ice core from the Tibetan Plateau

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chinese Science Bulletin 2003年第19期48卷 2134-2138页

作者： wang ninglian, yao tandong, pu {5., zhang yongliang, sun weizhen & wang Youqing key laboratory of Ice Core and cold Regions Environment, cold and {15. Regions environmental and engineering research institute, chineseacademy of sciences, lanzhou 730000, china key {1. of Ice Core and {2. Regions Environment Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences China

By comprehensive analyses, it was found that the variations in d 1.O recorded in Malan ice core from theKekexili Region on the Tibetan Plateau could represent thechanges in air temperature during the summer half year (from May to October) over the Kekexili Region and the northern margin of the Tibetan Plateau. The general increase trend in d1.O in this ice core during the past century indicated climate warming, and it was estimated that air temperature during the summer half-year rose about 1.2. over there then. However, this ice core record documented that the study area has been cooling while most of the world has been dramatically warming since the late 1.70s. A teleconnection was foundbetween the variations in d 1.O in the Malan ice core and the North Atlantic Oscillation. Moreover, the variations in d 1.O in this ice core were similar to that in the summer half-year air temperature over the southern Tibetan Plateau on thecenturial time scale, but opposite on the multidecadal timescale.

关键词：空气温度 δ^1.O 西藏高原全球变暖马伦冰核北大西洋波动气候变化

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