太白山最近1000年的孢粉记录与古气候重建尝试

秦岭太白山佛爷池最近1000年的孢粉记录及据此所重建古气候参数的时间序列,揭示了历史时期小冰期和中世纪温暖期的气候特征。小冰期的起止时间为1420-1920aAD。其1月与7月平均温度反映本区夏季风与冬季风的变化有很大的不一致性。小冰期开始时,冬季风突然增强,夏季风显示不稳定波动,并相对变弱,而降水一度增多。小冰期的结束是以冬季风逐渐减弱为先导,而夏季风呈突然增强势态,降水偏少。在中世纪温暖期中,1200-1340aAD发生快速气候波动,出现暖夏、冷冬等特征气候,成为历史上少见的灾害性气候时段。 

SPORE-POLLEN RECORDS AND TENTATIVE PALEOCLIMATE RECONSTRUCTION IN TAIBAI MOUNTAIN IN THE LAST 1000 YEARS

The spore pollen records and time sequence of the paleoclimate parameters at Foyechi Pond of Taibai Mountain reveal the character of Little Ice Age and Medieval Warm Period.Little Ice Age spans from 1420 AD to 1920 AD.The annual mean temperature in January and July during this period has shown considerable inconsistency of the changes of winter monsoon and summer monsoon in this area.At the beginning of Little Ice Age,there was a strengthening of the winter monsoon and consequent southwards expansion,with the summer monsoon weakened and fluctuated,and the annual total precipitation increased.At the end of Little Ice Age,there was a gradual decline of winter monsoon and a sudden strengthening of summer monsoon,with decreased annual total precipitation.The precursor of end of Little Ice Age was gradually weakening winter monsoon,abruptly enhanced summer monsoon,and relatively rare precipitation.The Medieval Warm Period (1200-1340 AD) was witnessed violent disastrous climate with warm summer and cold winter.