大同盆地晚更新世以来气候变化

Climatic Change in Datong Basin Since the Late Pleistocene

为了更好地了解大同盆地过去气候的变化过程,找出其气候变化规律,预测未来气候变化趋势,更好地指导农业生产。本研究通过对沉积剖面地层的观察与样品的测年,运用磁化率和粒度指标,恢复了大同盆地晚更新世以来的气候变化:整体呈现出"暖湿—冷干—暖干"的气候旋回特征,分为上更新世许家窑组暖湿期、马兰组干冷期及全新世暖干期,并且气候有逐渐干旱化趋势。部分学者对近些年降水与气温变化的研究以及未来气候趋势的预测,更证实了这一结论的合理性。总之,大同盆地晚更新世以来气候总体呈干旱化趋势,此结论将为本区干旱化农业发展政策的制定提供可靠的科学依据。

The paper aims to find out the process of climate change in Datong Basin and the change rule, to predict the trend of climate change in the future, and serve local agricultural production. The author observed the formation of the sedimentary section and dating of samples, used the grain size and magnetic susceptibility analysis, and restored the climate change since the late Pleistocene in Datong Basin. The result showed that there were warm and wet-cold and dry-warm and dry climate cycles： the late Pleistocene of the Xujiayao Group was warm-wet climate;late Pleistocene of the Malan Group was dry-cold climate;Holocene was warm-dry, the climate change presented a gradual dry and warm trend. Predictions on future climate change trend made by scholars according to recent changes of precipitation and temperature confirmed that the above conclusion was reasonable. In short, the overall climate has shown a dry trend since the late Pleistocene in Datong Basin, the findings could provide a reliable scientific basis for the development of arid agricultural policies in this region.