北极新奥尔松地区环境演变的沉积记录

分析了北极新奥尔松地区伦敦岛的湖泊沉积物L1的16种元素(Hg、Se、Cd、As、Cu、Zn、P、Fe、Ti、K、Mn、Ca、Mg、Na、Si、Al)及TOC(总有机碳)的含量.结果表明:沉积物表层5 cm部分Hg、Se、Cd等重金属元素的污染主要是由20世纪以来新奥尔松煤矿开采活动引起的;而5 cm以下部分属于自然沉积.同时,发现最表层的Hg、Se、Cd含量有降低趋势,很可能是新奥尔松煤矿的关闭导致煤灰沉积的减少.计算了ICV等元素比值,其结果揭示了新奥尔松地区的化学风化作用十分微弱,过去几千年来,该地区气候环境经历了相对暖湿-寒冷-相对暖湿的阶段.

Environmental change in Ny-Alesund, Arctic as recorded in lake sediments

A Lake sediment core(L1) was collected from London Island at Ny-Alesund and concentrations of 16 elements including Hg,Se,Cd,As,Cu,Zn,P,Fe,Ti,K,Mn,Ca,Mg,Na,Si,Al and TOC(total organic carbon) were analyzed.The results show that the enrichment of heavy metals(e.g.,Hg,Cd,Se) in the sections from 0 cm to 5 cm in the lake sediment was ascribed to the coal-mining in Ny-Alesund in the 20th century.However,the pollution of heavy metals is not serious.The levels of heavy metals under 5 cm in depth were contributed to natural depositation.The index of ICV and other elements' ratios were calculated as well.The results indicate that the weathering process in this region is very weak and climate change during the past several hundred years has undergone three stages from humid/warm,dry/cold to humid/warm.