Department of Environmental and Occupational Health, University of Arkansas for Medical Sciences, 4301 W. Markham St., Little Rock, AR 72205, USA.
Environ Pollut. 2013 Oct;181:167-71. doi: 10.1016/j.envpol.2013.06.008. Epub 2013 Jul 15.
Here we present the chemical characterization of the water-soluble organic carbon fraction of atmospheric aerosol collected during a prescribed fire burn in relation to soil organic matter and biomass combustion. Using nuclear magnetic resonance spectroscopy, we observed that humic-like substances in fire emissions have been associated with soil organic matter rather than biomass. Using a chemical mass balance model, we estimated that soil organic matter may contribute up to 41% of organic hydrogen and up to 27% of water-soluble organic carbon in fire emissions. Dust particles, when mixed with fresh combustion emissions, substantially enhances the atmospheric oxidative capacity, particle formation and microphysical properties of clouds influencing the climatic responses of atmospheric aeroso. Owing to the large emissions of combustion aerosol during fires, the release of dust particles from soil surfaces that are subjected to intense heating and shear stress has, so far, been lacking.
在这里，我们介绍了在规定的火灾燃烧过程中收集的大气气溶胶中水溶性有机碳部分的化学特性，以及与土壤有机质和生物质燃烧的关系。使用核磁共振波谱法，我们观察到火灾排放物中的类腐殖质物质与土壤有机质有关，而不是与生物质有关。使用化学质量平衡模型，我们估计土壤有机质可能会对火灾排放物中的有机氢贡献高达 41%，对水溶性有机碳贡献高达 27%。当灰尘颗粒与新鲜燃烧排放物混合时，会大大增强大气的氧化能力、颗粒形成和云的微物理特性，从而影响大气气溶胶的气候响应。由于火灾期间燃烧气溶胶的大量排放，目前还缺乏受到强烈加热和剪切应力的土壤表面释放灰尘颗粒的情况。
