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引用本文:陈豆,马雪洋,张玉枝,阳亚平,张家武.柴达木盆地东部尕海短钻岩芯记录的过去近400 a区域环境变化.湖泊科学,2015,27(4):735-744. DOI:10.18307/2015.0423
CHEN Dou,MA Xueyang,ZHANG Yuzhi,YANG Yaping,ZHANG Jiawu.Environmental changes during the past 400 years documented by a short core from Lake Gahai, eastern Qaidam Basin. J. Lake Sci.2015,27(4):735-744. DOI:10.18307/2015.0423
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柴达木盆地东部尕海短钻岩芯记录的过去近400 a区域环境变化
陈豆, 马雪洋, 张玉枝, 阳亚平, 张家武
兰州大学西部环境教育部重点实验室, 兰州 730000
摘要:
干旱区湖泊沉积可以有效记录区域湿度变化及粉尘活动历史,位于柴达木盆地德令哈南部的咸水封闭湖泊尕海具有恢复区域环境变化的潜力.该地区的长序列环境演变研究已开展了较多的工作,但缺乏短尺度、高分辨率的近代以来的环境变化湖泊记录.通过对尕海深水区短钻岩芯放射性核素210Pb和137Cs的年代测定和沉积物各指标分析,认为尕海沉积物碳酸盐含量可以反映区域湿度变化;而粗颗粒组分(>66.9μm)主要由风力搬运入湖,其含量可以指示区域粉尘活动历史.区域近400 a的环境变化可划分为3个阶段:16331750 AD:各指标出现大幅度波动,表现出该时期气候环境的不稳定和干湿交替,其中16501720 AD的变化波动尤为显著,这与太阳活动进入Maunder极小期存在一定的联系.17501950 AD:区域气候环境无明显波动,碳酸盐含量逐渐降低,湿度增加.19502010 AD:各指标变动剧烈,区域虽降水增多,但由于蒸发加强,湿度降低;1974 AD以后粗颗粒组分含量急剧上升,表现出高强度尘暴事件.
关键词:  尕海  碳酸盐  湿度  粉尘活动  柴达木盆地
DOI:10.18307/2015.0423
分类号:
基金项目:国家自然科学基金[JP2]项目(41271220, 41102112)和中央高校基本科研业务费(lzujbky-2013-k18)联合资助.
Environmental changes during the past 400 years documented by a short core from Lake Gahai, eastern Qaidam Basin
CHEN Dou, MA Xueyang, ZHANG Yuzhi, YANG Yaping, ZHANG Jiawu
Key Laboratory of Western China's Environmental Systems(MOE), Lanzhou University, Lanzhou 730000, P.R.China
Abstract:
Lake sediments in arid area can record the change of regional humidity and dust history. Lake Gahai, a saline and hydrologically-closed lake in the south of Delingha, Qinghai Province, has the potential for reconstructing the local environmental change. Although many long-term environment evolution researches have been carried out in this area, short time-scale and high-resolution records from lake sediments are still lacking. Here we present a nearly 400-year record from a short core taken form Lake Gahai. The chronology of the short core was established by 210Pb and 137Cs analysis. Carbonate content, magnetic susceptibility and grain size were analysed. The variation of carbonate content can be used toindicate the change of local humidity and the coarser fraction (>66.9μm) was mainly transported by winds, reflecting the dust storm events. The environmental change during the past 400 years can be divided into 3 stages.16331750 AD: large fluctuations of proxies indicated an unstable dry and wet climate environment, especially during the 16501720 AD, and this obvious change was related to the solar activity. 17501950 AD: the decrease of carbonate content reflected an increasing local humidity. 19502010 AD: strengthened evaporation led to a low humidity although the regional precipitation increased. After 1974 AD, strong dust storm events were recorded by the coarser grain fraction.
Key words:  Lake Gahai  carbonate content  humidity  dust activity  Qaidam Basin
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