论文部分内容阅读
通过对青藏高原东北部共和盆地泥炭沉积的粒度与地球化学元素分析,重建了区域全新世千年尺度的气候变化过程.结果显示:10.0～8.6cal ka BP区域暖湿程度逐渐增加,但在8.6～7.1cal kaBP气候相对寒冷干燥,7.1～3.8cal ka BP暖湿程度总体上为全新世最佳,但也出现明显的气候波动,3.8～0.5cal ka BP气候向冷干方向发展,0.5cal ka BP以来气候又逐渐转向暖湿.这一特征与中国东部季风区的气候变化有很好的一致性.此外,区域全新世气候变化过程中存在10次千年尺度的寒冷事件,并与高原冰芯、湖泊、泥炭和风成沉积记录的古气候变化,甚至与北半球高低纬度的气候变化都具有良好的可比性.因此,认为区域全新世气候变化具有“季风模式”与“千年尺度震荡”的双重特点.
Based on the analysis of the grain size and geochemical elements of the peat deposits in the Gonghe Basin, northeastern Qinghai-Tibet Plateau, the climatic change process of the regional Holocene millennial scale was reconstructed.The results showed that the warm and humid degree gradually increased in the region of 10.0 ~ 8.6cal ka BP, 7.1cal kaBP The climate is relatively cold and dry, and the warm and wet degree of 7.1-3.8cal ka BP is generally the best in the Holocene, but obvious climatic fluctuations also appear. The climate of 3.8-0.5cal ka BP develops in the direction of cold and dry, and the 0.5cal ka BP Since the climate has gradually turned to warm and humid.This feature is consistent with the climate change in the monsoon region of eastern China.Furthermore, during the Holocene climatic change in the region there are 10 millennial-scale cold events and are associated with the ice core, Paleoclimate recorded by sediments from lakes, peaties and aeolian formations is even comparable with climate change at latitude and longitude in the Northern Hemisphere, so it is considered that the Holocene climate change in the region possesses “monsoon pattern” and “millennium scale turbulence” Double features.