摘要
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 lakeshore-geomophology and referring to the paleoclimate of selected section, in the past 10000 years, Ebinur Lake experienced three stages of high lakelevel: 6.5ka—8.0ka B. P. , 4.5ka—6.0ka B.P. and 2.0ka-3.0ka B. P. , higher than that of present by 25m, 17m and 6m. Responsively, their surfae areas were 3000 km^2, 2330 km^2 and 1334 km^2 respectively. In this paper, in terms of a hydrological and energy-balance model, the sensitivity of its parameters is discussed in detail, and also, paleoprecipitation of three high lake-level stages estimated. Among these parameters, lake coefficient is the main factor affecting the estimation of paleoprecipitation. And land albedo, Bowen ratio and cloud cover also show high sensitive. But temperature indicates relatively low sensitivity. By applying this hydrological and energy-balance model, the estimates of paleoprecipitation in different periods 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; 306 mm/a in 4.5 ka—6.0 ka B. P. , an increase by 16% and 287 mm/a in 2.0—3.0 ka B.P. , an increase by 9% of the present.
出处
《湖泊科学》
EI
CAS
CSCD
1993年第4期299-306,共8页
Journal of Lake Sciences
关键词
全新世
古降水量
艾比湖
降水
Holocene epoch, hydrological and energy-balance model, paleoprecipitation, stage of high lake-level, Ebinur Lake
