摘要
冰芯中草酸根记录的研究有助于对过去环境变化的认识.色谱分析表明,天山一号冰川所记录的过去43年草酸根的平均含量为3.6?9.2ng/g (x1s, N=534).草酸根具有一个含量约为2ng/g的背景值,在背景值基础上存在含量的突变峰值,多数峰值的含量超过10ng/g,且其增减过程多局限在1年之内.一号冰川与珠穆朗玛峰远东绒布冰川过去40年的草酸根记录具有相同的变化特征.虽然后者的平均含量是前者的7倍左右,但两冰川的草酸根峰值几乎具有一一对应的关系.这种对应关系表明两地区可能拥有同一个草酸根来源或同一类型的来源,因而具有时间上的同期性.草酸根含量的变化与南亚地区工业和经济发展以及环境保护事业的发展历程相一致,它直接或间接地来自人类生产和生活过程中对大气所造成的污染.
Retrieval of oxalate record from ice cores sheds light on past environmental changes. Using an Ion-Chromatography, Oxalate was determined in an ice core from Glacier 1 (43?6碞, 86?9碋) at Urumqi river head, Tianshan, China. It averages 3.6?.2ng/g (x1s, N=534) and has a background below 2ng/g with sporadic enhancements in the past 43 years. Most of the spikes reach beyond 10ng/g and have the duration less than a year. The variation correlates with that in the Far East Rongbuk (FER) Glacier (27?9碞, 86?5碋), Everest, which is located 1600km far away across the Qinghai-Tibetan Plateau and Taklimakan Desert. Although the concentration enhancement in FER Glacier is around 7-fold higher, and lasts for longer time than in Glacier 1, oxalate reaches its highest concentration in both cores at the same time. The correlation of the records suggests that the two areas may have had the same kind of local sources, or shared a common source in Indian subcontinent via the longitudinal atmospheric circulation. Oxalate variation in the past 40 years coincides with the regional industrial/economic development and the environmental preservation in southern Asia. It comes primarily from anthropogenic pollution.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2003年第1期1-6,共6页
China Environmental Science
基金
国家自然科学基金资助项目(40073035)
关键词
草酸
大气污染
环境变化
冰川
冰芯
天山
珠穆朗玛峰
oxalate
atmospheric pollution
environmental change
glacier
ice core
Tianshan
Qomolangma (Everest)