哈尔滨沙尘沉降物碳酸盐及其碳同位素特征  

Carbonate and Carbon Isotope Characteristics in Harbin Sand-Dust Fallouts

作　　者：谢远云[1] 孟杰[1] 郭令芬[1] 何葵[1] 

机构地区：[1]哈尔滨师范大学地理科学学院,黑龙江哈尔滨150080

出　　处：《地理与地理信息科学》2010年第5期63-67,75,共6页Geography and Geo-Information Science

基　　金：国家自然科学基金项目(41072259);黑龙江省自然科学基金项目(G200803);哈尔滨师范大学青年学术骨干资助计划项目(08KXQ-02)

摘　　要：分析了哈尔滨2002年3月20日、2007年5月8日和2008年5月28日沙尘沉降物的碳酸盐及其稳定同位素组成。结果表明,哈尔滨沙尘沉降物的碳酸盐含量介于3.8%~7.3%,均值为5.28%,2002年沙尘沉降物碳酸盐含量为4.62%,2007年为7.11%,2008年为4.43%,含量普遍偏低,为国内有报道的最低值;沙尘沉降物的碳酸盐碳同位素组成在-6.39‰^-7.83‰,均值为-7.3‰,2002年沙尘沉降物碳酸盐δ13C为-7.12‰,2007年为-7.36‰,2008年为-7.51‰,也为国内有报道的最低值。沙尘沉降物碳酸盐含量的低值而道路表土碳酸盐含量的高值表明,仅有碳酸盐含量还不足以证明沙尘的物质来源,而碳同位素组成则显示本地源而非西北粉尘源区对沙尘的主要贡献。利用沙尘沉降物的碳酸盐含量和碳同位素组成示踪沙尘源区是可能的。The carbonate and carbon isotope composition of the Harbin sand-dust fallouts respectively from the March 20,2002,May 8,2007 and May 28,2008 were analyzed.The results showed that the carbonate content of Harbin sand-dust fallouts changes from 3.8% to 7.3%,with an average of 5.28%,of which the content is 4.62% in 2002,7.11% in 2007,and 4.43% in 2008.The carbonate content of sand-dust fallouts is generally low,with lowest value in internal report.The carbon isotopic composition of sand-dust fallouts is-6.39‰～-7.83‰,with an average of-7.3‰ and lowest value in internal report,of which the carbonate δ13C value is-7.12‰ in 2002,-7.36‰ in 2007,and-7.51‰ in 2008.The facts that low carbonate content of sand-dust fallouts and high carbonate content of the road surface soil indicate the source of sand-dust fallouts isn′t confirmed only by carbonate content,and however carbon isotope composition indicates the local source,but not northwest dust source areas has main contribution to sand dust.It is therefore possible to identify dust sources with carbonate and δ13C value of the sand-dust fallouts due to their significant regional differences in dust source regions of China.

关 键 词：碳酸盐 碳同位素组成 沙尘沉降物 源区追踪 哈尔滨 

分 类 号：P445.4[天文地球—大气科学及气象学]