【摘要】 根据从可可西里地区马兰冰帽钻取的深 10 2 .0 7m冰芯记录中δ18O的年变化 ,恢复了青藏高原中部 2 0世纪 2 0年代以来的气候变化 .研究表明 ,青藏高原中部的升温变化与北半球 2 0世纪的升温变化的总体趋势一致 ,最暖阶段出现在 5 0— 80年代早期 .期间也出现了几次明显的冷的波动 ,尤其 80年代后期至 90年代持续低温 ,可能与这一时段强盛的夏季风有关 .这也表明 2 0世纪末全球急剧升温变化的过程中 ,某些地区存在气候变冷的波动事件 .更多还原

【Abstract】 Climate change since the 1920s was rec onstructed based on annual δ 18 O from a 102.07 m ice core recovered from the Malan Ice Cap in Hoh Xil region in the central Tibetan Plateau in May 1999. The Malan ice core shows that warming trend during the 20th in central Tibetan Plateau is similar to the warming of the Northern Hemisphere. The warmest period recorded by the core was during the 1950s to the early 1980s. There are also several colder stable periods punctuated through the warming, especially, the climate during the late 1980s to 1990s was colder, maybe caused by the strong summer monsoon. The record also suggests that there were some short terms with cooling fluctuation, which might appear in some regions during the rapid global warming in the latest 20th century.更多还原