黄河源区距今13万年来古气候演化  

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

作　　者：张玉芳 张俊牌[1] 徐建明[1] 

机构地区：[1]林防地质矿产部水文地质工程地质研究所

出　　处：《地质力学学报》1998年第4期69-75,共7页Journal of Geomechanics

基　　金：地质矿产部"八五"重点基础项目

摘　　要：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１３０ｋａＢＰ以来的古气候演变规律。即：１３０．０—１１０．０ｋａＢＰ寒冷干旱；１１０．０—８２．０ｋａＢＰ寒温较湿；８２．０—１０．４ｋａＢＰ寒冷干旱；１０．４ｋａＢＰ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—７．５ｋａＢＰ）（Ａｎａｔｈｅｒｍａｌ）；中全新世大暖期（７．５—３．５ｋａＢＰ）（Ｍｅｇａｔｈｅｒｍａｌ）；晚全新世降温期（３．５ｋａＢＰ至今）（Ｋａｔａｔｈｅｒｍａｌ）。本区古气候总的规律是：冷期长且比全球其它地方提前，暖期短且开始时期滞后。全新世以来气候波动具有千年尺度的振荡规律，晚全新世至今，气温有逐渐降低，湿度逐渐变干的趋势。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.

关 键 词：黄河源区 古气候 大暖期 古气候 气候变化 

分 类 号：P532[天文地球—古生物学与地层学] P532[天文地球—地质学]