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青藏高原雪冰中碳质气溶胶含量变化
Carbonaceous aerosols in snow and ice in the Tibetan plateau

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刘先勤 1   王宁练 1   姚檀栋 1   徐柏青 1   赵华标 1   贺建桥 1   郭学军 2  
文摘 文中采用供氧两步加热的方法对过滤到石英膜上的雪冰中碳质气溶胶含量进行分析,其中有机碳(OC)和元素碳(EC)分别在340和650 ℃的条件下进行热解、氧化分离,生成的CO2转化成CH4并由气相色谱仪氢火焰离子化检测器(FID)检测其含量.空白测试表明,该系统的OC本底值为(0.50±0.04)(1σ) μg C,EC为(0.38±0.04)(1σ) μg C.利用这套分析系统对青藏高原8条冰川的34个雪冰和降水样品中OC和EC的含量进行了测试.结果表明,在青藏高原雪冰中OC和EC含量自东向西、自北向南呈明显的下降趋势(西昆仑除外).在高原东北部EC的质量分数相对较高,平均为79.2 ng·g-1;在喜马拉雅西段EC的质量分数最低,平均为4.3 ng·g-1.在冰川表面,雪的融化使雪冰中碳质气溶胶聚集,并导致其含量明显升高,该过程降低了雪表面的反照率,加速了冰川的消融.
其他语种文摘 An optimization of a 2-step thermal method was used to determine organic carbon (OC) and element carbon (EC) concentrations in snow and ice from the Tibetan plateau. OC is removed from the quartz filter under a pure oxygen atmosphere during the first combustion step at 340 ℃. The remaining carbon defined as EC is oxidized at the next combustion temperature of 650 ℃. Background contamination of 0. 50±0. 04 (1σ)μg C for OC, and 0.38±0. 04 (1σ)μg C for EC are determined by blank tests. EC and OC concentrations in snow samples collected from 8 glaciers in the Tibetan plateau were analyzed by this method. The results allow quantification for the first time of the different carbonaceous particle contents in the Tibetan plateau and other regions. The concentrations of EC and OC particles in snow in the Plateau show a clear decreasing trend, excluding the west Kunlun region, from east to west and from north to south. The highest mean EC content, 79.2 ng · g^-1, was found in the northeast region, and the lowest, 4.3 ng · g^-1, in the western Himalayas. We note that snow melting will result in accumulation of carbonaceous particles on glaciers, which suggests that such melting can reduce snow albedo and accelerate glacier shrinking.
来源 地学前缘 ,2006,13(5):335-341 【核心库】
关键词 青藏高原 ; 雪冰 ; 有机碳(OC) ; 元素碳(EC)
地址

1. 中国科学院,寒区旱区环境与工程研究所, 中国科学院冰冻圈与寒区环境联合重点实验室, 甘肃, 兰州, 730000  

2. 中科院青藏高原所, 中科院青藏高原环境与过程实验室, 北京, 100085

语种 中文
文献类型 研究性论文
ISSN 1005-2321
学科 环境科学基础理论
基金 国家自然科学基金资助项目 ;  国家自然科学基金国家杰出青年科学基金 ;  中国科学院“百人计划”项目
文献收藏号 CSCD:2554521

参考文献 共 18 共1页

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引证文献 6

1 王建 唐古拉冬克玛底冰川流域pH值和电导率分析 环境科学,2007,28(10):2301-2306
被引 5

2 刘先勤 慕士塔格冰芯记录的近50年来碳质气溶胶含量变化 科学通报,2008,53(19):2358-2364
被引 1

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王宁练 0000-0001-9965-4896
姚檀栋 0000-0002-9979-9849
徐柏青 0000-0003-0901-3863
赵华标 0000-0001-9121-4917
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