中国天山过去43年大气环境变化:来自冰芯草酸根记录的证据
CHANGES IN ATMOSPHERIC CHEMISTRY AS REVEALED BY OXALATE RECORD IN THE ICE CORE OF GLACIER 1, TIANSHAN, CHINA
查看参考文献32篇
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文摘
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中、低纬度地区山地冰川有机酸记录的研究是目前国际冰芯地球化学研究的前沿之一.中国天山乌鲁木齐河源一号冰川为一中纬度山地冰川.对其冰芯的草酸根含量的分析显示,其冰芯所记录的过去43年草酸根变化的总体特征是在一个背景值基础上存在着含量的突变峰值.草酸根的背景值含量在1 ng/g左右,在部分冰芯段,其含量甚至低于测试分析的检测限;而大多数草酸根峰值的含量都达到或超过了10 ng/g.草酸根的平均含量为3.6 ± 9.2 ng/g (±1σ, N=534),其中70%以上由峰值构成.50年代后期是草酸根的一个低值期,平均含量略高于本底值;至60-70年代达到最高值,平均含量为5.0ng/g;80年代草酸根平均含量又下降到接近50年代后期的水平;至90年代回落到本底值附近.草酸根的主要来源是人类活动对大气所造成的污染.其过去43年平均含量的变化大致与中国西部工业和环境保护事业的发展历程相一致,是西部区域大气污染变化的一种反应. |
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其他语种文摘
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Records of organic acids in the mid-and low-latitude glaciers have attracted the attention of global researchers in recent years. Glacier 1 at the Urumqi River head, Tianshan, China, is located at the mid latitude, the record of oxalate in the past 43 years has been retrieved. Oxalate averages 3. 6 ± 9. 2 ng/g (x ± 1σ, N=534), manifesting a background value around 1 ng/g. On the background, there exist abrupt enhancements in some periods while low values even less than the detection limit in some others. With most of the peaks approximately reaching 10 ng/g, the enhancements comprise 70% of the average concentration. Oxalate is merely higher on average than the background value in the late 1950s, then reached up to 5. 0 ng/g in the 1960s- 1970s. The 1980s witnessed a decrease close to the level in the 1950s, while in the 1990s the value declined to.the background. The variation is consistent with the development of regional economy and the environmental protection in the west, the concen-tration enhancements, therefore, should have resulted mainly from anthropogenic emission to the atmosphere. |
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来源
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地球与环境
,2005,33(1):1-5 【核心库】
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关键词
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草酸
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冰川
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冰芯
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大气污染
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天山
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵州, 贵阳, 550002
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中国科学院寒区旱区环境与工程研究所冰芯与寒区环境研究室, 甘肃, 兰州, 730000
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-9250 |
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学科
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环境科学基础理论 |
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基金
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国家自然科学基金资助项目
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文献收藏号
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CSCD:1912503
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