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Analysis of carbon isotopes in airborne carbonate and implications for aeolian sources

机译：机载碳酸盐中碳同位素的分析及其对风成因的启示

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Methods were developed to determine the mass ratios of caibon isotopes in trace amounts of aerosol carbonate. A Finnigan MAT 252 mass spectrometer fitted with an on-line Kiel device was to determine the ~(13)C/~(12)C ratio in CO_2 produced from the carbonate. A study using these methods was conducted to characterize the carbonate carbon isotopes in aerosol samples collected in Xi'an on dusty and normal days during March and April 2002. Results of the study demonstiate that insights into the origin ofthe dust can be deduced from its isotopic composition. That is, the δ ~(13)C of carbonate for dust storm samples tanged from -1.4‰ to -4.2‰, and this is consistent with sandy materials in dust source regions upwind. In contrast, for non-dusty days δ~(13)C ranged from -7.5% to -9.3%c, which is more similar to fine particles emitted from local surface soils. Comparisons of dust storm aerosols with surface soils from source regions and with aerosol samples collected downwind indicate that the δ ~(13)C values did not change appreciably during long-range transport. Therefore, carbon isotopes have the potential for distinguishing among source materials, and this approach provides a powerful new tool for identifying dust provenance.
机译：开发了确定轻质碳酸气溶胶中caibon同位素质量比的方法。装有在线Kiel装置的Finnigan MAT 252质谱仪用于确定碳酸盐产生的CO_2中〜（13）C /〜（12）C的比率。进行了使用这些方法的研究，以表征2002年3月至4月尘土飞扬的平日在西安采集的气溶胶样品中的碳碳同位素。研究结果表明，可以从其同位素中得出有关尘埃起源的见解。组成。也就是说，沙尘暴样品的碳酸盐的δ〜（13）C介于-1.4‰至-4.2‰之间，这与上风向尘埃源地区的沙质物质是一致的。相反，在非多尘天，δ〜（13）C在-7.5％至-9.3％c的范围内，这与从当地表层土壤释放的细颗粒更为相似。沙尘暴气溶胶与源区表层土壤和顺风收集的气溶胶样品的比较表明，在远距离迁移过程中，δ〜（13）C值没有明显变化。因此，碳同位素有可能在原料之间进行区分，这种方法提供了一种强大的新工具来识别粉尘来源。

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