摘要
In this paper, climatic and environmental changes were reconstructed since 1129A.D. based on the Malan ice core from Hol Xil, the northern Tibetan Plateau. The record of δ 18O in the Malan ice core indicated that the warm-season air temperature variations displayed a general increase trend, the 20th-century warming was within the range of natural climate variability, and the warmest century was the 17th century while the warmest decade was the 1610s, 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 19th century. Comparing the variations of δ 18O and the dust ratio, it is found that there was a strong negative correlation between them on the time scales of 101―102 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.
In this paper, climatic and environmental changes were reconstructed since1129A.D. based on the Malan ice core from Hol Xil, the northern Tibetan Plateau. The record ofδ^(18)O in the Malan ice core indicated that the warm-season air temperature variations displayed ageneral increase trend, the 20th-century warming was within the range of natural climatevariability, and the warmest century was the 17th century while the warmest decade was the 1610s,over the entire study period. The ''Medieval Warm Epoch'' and ''Little Ice Age'' were also reflected bythe 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 19thcentury. Comparing the variations of δ^(18)O and the dust ratio, it is found that there was astrong negative correlation between them on the time scales of 10~1 — 10~2 years. By analyses ofall the climatic records of ice cores and tree rings from the northern Tibetan Plateau, it wasrevealed that dust events were more frequent in the cold and dry periods than in the warm and wetperiods.
作者
WANG Ninglian1,2, YAO Tandong2,1, PU Jianchen1, ZHANG Yongliang1 & SUN Weizhen1 1. Key Laboratory of Cryosphere and Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
2. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China
基金
This work was supported by the Centuria Program of the Chinese Academy of Sciences(CAS)(Grant No.2004401)
the National Natural Science Foundation of China(Grant Nos.40525001 and 40121101)
the Key Research Project of the Knowledge Innovation Program of CAS(Grant No.KZCX3-SW-339-3)
the Chinese National Basic Research Program(Grant No.2005CB422003).
