Ebinur Lake Research Articles

The holocene sedimental characteristicand paleoclimatic evolution of Ebinur Lake, XinJiang

On the basis of lacustrine sedimentary profile of Ebinur Lake, sequences of evolution of paleoclimate and paleoenvironment in Ebinur Lake area have been rebuilt by analysing the sedimentary stratigraphy, bio-stratigraphy and geochemistry as well as the chronological records. The results show that, during the last 10 ka years, the general change trends of the paleoclimate in E-binur Lake area can be divided into three stages: (1) 10. 2 – 8.3 ka B. P., a warm-cool dry climate stage; (2) 8.3–3.5 ka B. P., a warmer moist climate stage (specially, 7.3–6.4 ka B. P., a relatively stable humid temperate stage); (3) 3.5 ka B. P. —present, adraught temperate climate stage, similar to the present climate. In addition, there existed clearly several times of secondary undulations of dry-humid climate, i.e. 8.3 ka and 7.3 ka for dry climate

Pale0clim atlc estimate dur1ng the last 10000 years 1n eb1n ur la ke bas1 ．xlnjlang

本文应用水热平衡模型, 对艾比湖全新世时期三个高湖面期的降水量进行计算。结果表明, 2ka—3ka B.P.降水量比现今高出9％, 达到287mm/a;4.5ka—6ka B.P.增加16％, 达到306mm/a;6.5ka—8.0ka B.P.增加了22％, 达到322mm/a。;Judging from the analysis of lakeshure-geomopho1ogy and referring to the paleoelimate of selected section.in the past l 0000 years, Ebinur Lake experienced thfee stages of high lake-level:6.5ka- 8.0ka B.P..4.5ka-6.0ka B.P.and 2.0ka-3.Oka B.P..higher than that of present by 25m , 17m and.Responsively, their surfae areas were 3000 km² , 2330 km² and 1334 km² respectively.In this paper, in terms of a hydroingica l an d energy-balarlce med e1.the sensitivity of its param eters js discussed in detail, an d also, paleopre, cipitation of three high lake—level stages estim ated. Among these param eters lake c(Jefficient is the main factor affecthag the estim ation of paleoprecipitation.And lan d albedo, Bowen ratio and cloud cover also show high sensitive—But tem peratnre indicates relatively low sensitivity- By applying this hydrological an d energy’balan ce model, the estim ates of paleopreeipitation in different pe riods are obtained.In proper order, the average precipitation was:332 mm /a in 6.5 ka- 8, 0 ka B. P., an increase by 22 of the present;305 mm/a in 4.5 ka- 6.0 ka B.P., an incre&se by l6 and 287mm/a in 2.0-3.0 ka B.P., an increase by 9 of the present.