云南寻甸地区最近八千年气候环境变迁  

CHANGE IN CLIMATE-ENVIRONMENT IN THE RECENT 8000 YEARS IN XUNDIAN, YUNNAN

作　　者：张会领[1] 袁道先[2] 覃嘉铭[2] 林玉石[2] 张美良[2] 王华[2] 

机构地区：[1]湛江海洋大学工程学院热能与动力系,广东湛江524008 [2]国土资源部岩溶动力学重点实验室,广西桂林541004

出　　处：《中国岩溶》2004年第4期293-298,共6页Carsologica Sinica

基　　金：中国科学技术部"中国洞穴石笋样品保护库的建造"项目(2003DEB6J069);国土资源部岩溶动力学重点实验室"云南寻甸地区8000年环境变迁"项目(2004-5-2)

摘　　要：通过对云南寻甸白石岩仙人洞1号石笋进行高精度TIMS-U系测年和氧碳稳定同位素分析,重建了寻甸地区中全新世8.0ka以来高分辨率古气候演化序列。石笋剖面的碳氧同位素记录揭示,云南寻甸地区自8.0kaB.P.以来的气候演化可以分为三个气候期:(1)8000～6000aB.P.为温暖湿润期,夏季风强盛,气温较高,降水丰沛,石笋的氧碳同位素偏负;(2)6000～5200aB.P.为季风气候衰退期,在这期间气温和降水都发生了较大变化,气候由温湿变为冷干,石笋氧碳同位素持续偏正;(3)5200～2100aB.P.凉干气候期,这一时期气候基本稳定,东亚季风对气候影响较大,但气温和降水都低于第一个气候稳定期。Based on ages of high precision TIMS-U series dating and carbon and oxygen isotopes analyzing to the stalagmite from Xianren cave in Xundian, high resolution time sequence of paleoclimatic change since the middle Holocene i.e. the recent 8000 years, has been reconstructed. The C-isotope from the stalagmite profile reveals that the climatic change in the recent 8000 years in Xundian can be divided into three stages approximately: (1) Warm and wet stage from 8000a B.P. to 6000a B.P., the air temperature was high and precipitation was abundant. (2) From 6000 a B.P.to 5200a B.P., the stage of monsoon climate weakening. During the stage, the temperature and precipitation changed a lot, from wet and warm to cool and dry. The C-isotope from the stalagmite continuously inclines to positive. (3) From 5200a B.P.to 2100a B.P., the cool and dry stage, the climate kept stable and was influenced more by the East Asian monsoon with lower temperature and precipitation than that in the first stage.

关 键 词：石笋 气候期 降水 碳同位素 气温 东亚季风 气候演化 气候环境 时期 湿润 

分 类 号：P532[天文地球—古生物学与地层学] P642.23[天文地球—地质学]