湖泊沉积物Mg/Ca作为气候代用指标的局限性  

Limitation of Mg/Ca Ratio as a Climate Indicator in Lake Sediment

作　　者：吴永红[1] 

机构地区：[1]闽江学院地理科学系,福建福州350108

出　　处：《安庆师范学院学报（自然科学版）》2016年第3期102-105,共4页Journal of Anqing Teachers College(Natural Science Edition)

基　　金：闽江学院科研计划项目(MYK14013)

摘　　要：Mg/Ca作为古气候古环境研究的代用指标已得到广泛应用,但是在湖泊沉积物研究中,由于不同区域局地环境的影响,湖泊中Mg/Ca变化的环境气候指示意义有很大差别,甚至出现相悖的情况。本文通过分析太湖沉积物Mg/Ca变化特征与区域环境变化的对应关系,与其他区域研究成果进行对比分析,探讨不同区域环境对湖泊沉积物Mg/Ca的影响。结果表明,湖泊沉积物Mg/Ca在特定区域环境影响下,有着不同的环境指示意义,该指标的应用需要认真研究当地环境的特殊性并与其他气候代用指标结合,以确保气候变化分析的准确性。Mg/Ca as an indicator of paleoclimate and paleoenvironmental research has been widely used .Especially in paleo-ceanographic studies, this indicator has been an important tool for instruction of ancient sea water temperature .However, studies in lake sediments show that Mg/Ca is affected by many factors.Affected by the specific local environment of different regions, in-dicative meaning of Mg/Ca for the environment and climate changes are very different in lake sediment, and even contrary. This paper analyzes the relevance between Mg/Ca of sediments in Taihu Lake and regional environment change, compares with other studies results, and investigates the effect of different regional environment on the Mg/Ca of lake sediment.The results show that the Mg/Ca of the lake sediment has different environmental significance under the specific environmental impact.So the applica-tion of Mg/Ca as an indicator need to seriously study the particularity of the local environment and combine with other climate prox-ies in order to ensure the accuracy of the analysis of the environment and climate change.

关 键 词：MG/CA 湖泊沉积 气候代用指标 

分 类 号：P531[天文地球—古生物学与地层学]