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首页> 外文会议>Symposium on Water Resources Systems - Water Availability and Global Change; Jun 30-Jul 11, 2003; Sapporo, Japan >Recent variability of the climate and glaciers in China's monsoon region
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Recent variability of the climate and glaciers in China's monsoon region

机译：中国季风区气候和冰川的近期变化

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摘要

Climatic data, ice core records, the tree-ring index and recorded glacier variations have been compared, and used to reconstruct a history of climatic and glacial changes in the monsoonal temperate-glacier region of southwestern China during the last 400 years. The results indicate that the region's temperature has increased in a fluctuating manner during the 20th century, after the two cold stages of the Little Ice Age of the 17th-19th centuries, with a corresponding retreat of most of the glaciers during the 20th century, against a background of global warming. Rates of retreat accelerated after the 1980s. The few advancing glaciers that did exist have started to retreat in recent years. The amount, trend and amplitude of variation of precipitation have differed in different parts of the region. The climatic records in the Dasuopu ice core, from the Himalaya area in the western part of the region, show a decreasing trend in precipitation, the converse of the trend in temperature. However, in the Hengduan Mountains and other areas of the eastern part of the region, a rising trend in rainfall has accompanied increasing temperatures, a result of the variable atmospheric circulations from different sources. The data indicate that the Southwest Monsoon, which is the principal controlling factor in the Chinese monsoonal temperate-glacier region, can be classified into two parts. One is the Indian Monsoon from the Arabian Sea, passing across the Indian Peninsula. This transports the vapour for precipitation in the Himalaya area, the western part of the monsoonal temperate-glacier region. The other part is the Bengal Monsoon originating in the Bay of Bengal, passing over Bengal and Burma. This is the major source of precipitation in the Hengduan Mountains and other areas in the eastern part of the region. In addition, the eastern part is influenced by the Southeast Monsoon arriving from the western Pacific, whilst the western part is affected in winter by the southern branch of the westerly circulation. This complex atmospheric situation results in differing patterns of precipitation in the western and eastern zones. Although it is clear that both temperature and precipitation affect the glaciers, further work is needed to confirm which is the major factor influencing present glacier change.
机译：比较了气候数据，冰芯记录，树木年轮指数和记录的冰川变化，并将其用于重建中国西南地区季风性温带冰川地区近400年的气候和冰川变化历史。结果表明，在17世纪至19世纪小冰期的两个寒冷阶段之后，该地区的温度在20世纪以波动的方式升高，而在20世纪，大多数冰川相应地退缩了。全球变暖的背景。 1980年代后，撤退速度加快。确实存在的少数先进冰川近年来已开始退缩。降水变化的数量，趋势和幅度在该地区的不同地区有所不同。来自该地区西部喜马拉雅地区的大索普冰芯的气候记录显示，降水量呈下降趋势，而温度呈相反趋势。但是，在横断山脉和该地区东部的其他地区，由于不同来源的大气环流变化，降雨伴随着温度升高而呈上升趋势。数据表明，西南季风是中国季风温带-冰川地区的主要控制因素，可以分为两部分。一种是来自阿拉伯海的印度季风，穿过印度半岛。它将蒸气输送到季风温带-冰川地区西部的喜马拉雅地区。另一部分是孟加拉季风，起源于孟加拉湾，经过孟加拉和缅甸。这是横断山脉和该地区东部其他地区的主要降水来源。此外，东部地区受西南太平洋的季风影响，西部地区在冬季受西风环流的南部分支影响。这种复杂的大气状况导致西部和东部地区的降水方式不同。尽管很明显温度和降水都会影响冰川，但是还需要进一步的工作来确定哪个是影响当前冰川变化的主要因素。

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