Decrease trend of dust event frequency over the past 200 years recorded in the Malan ice core from the northern Tibetan Plateau

作     者：WANG Ninglian Key Laboratory of Cryosphere and Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 73000, China Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China 

作者机构：Key Laboratory of Cryosphere and Environment Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou China Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2005年第50卷第24期

页      面：2866-2871页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：supported by the Century Program(Grant No.2004401) the Innovation Research Project of Chinese Academy of Sciences(Grant No.KZCX3-SW-339-3) National Basic Research Program of China(Grant No.2005CB422003) National Natural Science Foundation of China(Grant No.40121101) the Knowledge Innovation Project of CAREERI(Grant Nos.2003107 and 2004102) 

主　　题：青藏高原 马伦冰核 气候变化 扬尘事件 发生频率 

摘      要：By analyses of the dust layers in the Malan ice core from the northern Tibetan Plateau, it was found that dirty ratio in this core might be a good proxy for dust event frequency. The variations in the dirty ratio displayed a de- crease trend over the past 200 years, which implies that dust events became less frequent during the study period. The decrease trend in the variations in dust event frequency might be caused mostly by the natural processes, including increasing precipitation and weakening westerly which might be related with global warming. Furthermore, significant negative correlation was found between the dirty ratio and δ 18O in the Malan ice core. This is highly important for studying the effect of atmospheric dust on climate change.