黄河源区距今13万年来古气候演化

综合分析黄河源区－青海玛多地区斗格涌盆地钻孔剖面的孢粉及易溶盐等气候代用指标，揭示了该区１３０ｋａＢ Ｐ以来的古气候演变规律。即：１３０．０－１１０．０ｌｋａＢ Ｐ寒冷干旱；１１０．０－８２．０ｋａＢ Ｐ寒温较湿；８２．０－１０．４ｋａＢＰ寒冷干旱；１０．４ｋａＢ Ｐ至现代（即全新世）温湿冷干交替。全新世古气候又可划分为３期：早全新世升温期（１０．４－７．５ｋａＢ Ｐ）（Ａｎａｔｈｅｒｍａｌ）；

THE PALAEOCLIMATIC EVOLUTION OF THE YELLOW RIVER SOURCE AREA SINCE 130ka B P

By a comprehensive analysis of the proxy indices of climate such as readily soluble salt and spore-pollen of borehole profiles in Dougeyong Basin,the palaeoclimatic evolution pattern of the Yellow River source area since 130 ka B P has been revealad:1.From 130 ka B P to 110 ka B P,it was cold and dry;2.From 110 to 82 ka B P,cold but more humid;3.From 82 to 10.4ka B P,cold and dry;4.From 10.4 ka B P to recent(i.e.,Holocene),there was an alternation of warm-humid and cold-dry climate.And the climate in Holocene can further be divided into three stages:1)10.4-7.6 ka B P it was Anathermal;2)7.5-3.5 ka B P Megathermal;3)3.5 ka B P present Katathermal.In general palaeoclimate the area has a longer and earlier cold period and a shorter and later warm period as compared to other regions of the world.The climate fluctuations since Holocene have occurred at a time scale of one thousand years.Since Late Holocene there has been a gradual decreasein temperature and humidity.