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题名 中纬度中国-塔吉克斯坦东西向树轮气候研究
姓名 陈峰
院系 资源环境学院
专业 自然地理学
学位名称 理学博士
外文题名 Dendroclimatic research from east to west across middle latitudes areas between China and Tajikistan
第一导师姓名 陈发虎
关键词 亚洲中纬度干旱半干旱区;树轮;气候重建;时空变化;气候机制
外文关键词 arid and semiarid regions of the middle latitude Asia;Tree-ring;dendroclimatic reconstruction;temporal-spatial variation;climate mechanisms
学科 理学
摘要 1. 区域温湿组合配置特征 (1)位于季风区西部的甘肃东部黄土高原区近380年的暖季在年际和年代际尺度上都表现出暖干-冷湿的温湿组合。(2)位于西风季风过渡区的河西走廊近193年的暖季在年际变化上表现出暖湿-冷干的温湿组合(3)新疆北部最近221年的暖季在年际和年代际尺度上都表现出暖干-冷湿的温湿组合。总体而言,亚洲中纬度干旱半干旱区的暖季温湿组合在近200年来在年代际尺度上是以暖干-冷湿为主。 2. 中吉塔三国东西向干湿变化空间格局 (1)对比位于季风区西部的河西走廊和黄土高原区干湿变化序列与季风区东部的山东油松树轮宽度序列,发现它们在年际变化上表现弱正相关。因此,季风区东部和西部干湿变化是以同位相变化为主。(2)河西走廊和甘肃东部黄土高原区的近两个世纪的干湿变化在年际变化上具有良好一致性。(3)新疆北部不同地区既有很强公共干湿变化信号,也存在区域差异,最为明显的是天山东端和天山中西部,天山东端很可能是中纬度亚洲干旱半干旱区的一个重要地理分界线。(4)吉尔吉斯斯坦和塔吉克斯坦的阿赖山脉干湿变化与天山中部的干湿变化在年代际上存在较强一致性,都共同指示了20世纪中亚变湿趋势的存在。
外文摘要 First, based on tree-ring width and density data, we developed the reconstructions of regional drought and temperature respectively, and analyzed climate combinations of the different areas: (1) The Loess Plateau of Gansu have shown the warm-dry and wet-cold combinations on interannual and decadal scales during warm season, and affected by the East Asian summer monsoon activity during the last 380 years. During the strong monsoon period, the enhanced water vapor transport and increased precipitation can cause the temperature to drop, and vice versa. (2) The Hexi Corridor has the wet-warm and cold-dry combinations during warm season. However, due to the activities of climate system, such as Asian summer monsoon, sea surface temperature, the combination is not stable. (3) Northern Xinjiang also have shown a warm-dry and wet-cold combination on the interannual and decadal scales during the 221 years, however, warm and wet trend was found since the 1980s. Overall, the climate combination of warm season in the arid and semiarid regions of the mid-latitude Asia on the decadal scale is warm-dry and cold-wet. Second, based on the drought reconstruction, we analyzed the spatial patterns of drought in mid-latitude Asia: (1) The comparison showed that the weak positive correlations were found among the drought series from the monsoonal areas of China, and exhibited strong consistency on the decadal scale. Therefore, the changes in the eastern and western part of the monsoonal region are dominated by the positive phase changes. (2) The drought sequence of the Loess Plateau of Gansu has good correlations with the drought sequence of the Hexi Corridor. The drought reconstructions of Gansu have a good response to extreme events of Northwest China. At the same time, there are also some regional differences between the drought reconstructions of Gansu, which may by affected the interaction of westerlies and Asian summer monsoon. (3) The drought reconstructions of northern Xinjiang show the strong common signals, and there are also some regional differences in different parts of northern Xinjiang. Among them, the most obvious difference is found between the eastern end of the Tien Shan and central-west Tien Shan. The central-west Tien Shan and the Altay Mountains appear wet trend during the recent years, while the eastern end of the Tien Shan appeared to dry trend, and strongly associated with the drought series from the monsoonal areas of China. Thus, the eastern end o...
研究领域 环境变化
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