内蒙古岱海地区近千年气候环境演变的初步研究  

THE PRIMARY STUDY OF PALEOCLIMATE CHANGES DURING THE PAST MILLENNIUM IN DAIHAI LAKE,INNER MONGOLIA

作　　者：曹建廷[1] 王苏民[1] 沈吉[1] 

机构地区：[1]中国科学院南京地理与湖泊研究所

出　　处：《海洋地质与第四纪地质》2000年第2期15-20,共6页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金资助项目!( 4 970 2 0 2 8和 4980 3 0 0 1);中科院创新工程重大项目!( KZCX1-Y-0 5 )

摘　　要：根据岱海湖泊岩心沉积物的有机碳及其同位素、碳酸盐含量、自生碳酸盐氧同位素组成、介形类化石以及岩性特征 ,结合 Pb- 2 10测定的沉积速率 ,讨论了岱海近千年来的气候环境演化过程 ,结果表明 :980～ 740a B.P.气候以暖湿为主 ,岱海为高湖面期 ;740～ 5 40 a B.P.以冷湿气候为主 ;5 40～ 480 a B.P.湖面急剧下降 ,以冷干气候为主 ;480～ 370 a B.P.气候转温和 ,以温偏湿气候为主 ;370～ 2 2 0 a B.P.以温偏干气候为主 ;2 2 0～ 130 a B.P.为冷干气候 ;130 a B.P.以来 ,有效降水略有增加 ,以凉偏湿气候为主。本文环境指标揭示了现代小冰期的前期冷湿、后期冷干的气候特征 ;其记录的最后两次冷期与根据冰心、树轮、历史文献重建的十年平均温度推得的 145 0～ 15 10年、1790～ 1890年两次冷期极相一致。结合沉积记录的近百年气候演化特征 ,指出了目前湖泊水面萎缩、环境恶化主要是人类活动的影响所致。Located in the marginal belt of the southeast monsoon and ecozone,Daihai Lake area has always been one of the most interesting areas for studying the paleoclimate change.Based on the characteristics of environmental multiproxies,such as TOC,δ 13 C org ,carbonate contents,δ 18 O carb and the lithology of the sediment core,together with 210 Pb dating,the paleoclimate changes in the past thousand years have been primarily reconstructed in this area.The results showed warm and wet climate dominated in 980～740 aB.P.,followed by cold and wet climate in 740～540 aB.P..After the cold and dry climate in 540～480 aB.P.,warm and wet climate became prevailing in 480～370 aB.P.,followed by the warm and dry climate in 370～ 220 aB.P. and cold and dry climate in 220～130 aB.P..Since 130 aB.P. the climate has changed to be cool and wet.The environmental proxies also indicated the climate in the early stage of the Little Ice Age was mainly characterized by cold humid,rather than cold dry in this area.The last two cold periods recorded by the DH core were in good agreement with those inferred from ten years average temperature,which was deduced by tree rings,ice core and historical literature.This paper also advanced that human activities became the main reason of the lake environmental deterioration.

关 键 词：古气候 有机碳同位素 氧同位素 岱海 

分 类 号：P532[天文地球—古生物学与地层学] P736.44[天文地球—地质学]