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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Water content and morphology of sodium chloride aerosol particles
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Water content and morphology of sodium chloride aerosol particles

机译：氯化钠气溶胶颗粒的水含量和形态

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摘要

Sodium chloride droplets with a median diameter of approx 0.4 #mu#m were generated in the laboratory by atomizing an aqueous solution of NaCl under ambient conditions. Infrared extinction spectra of the aerosols under controlled relative humidity (RH) ranging from 15 to 95% were obtained. The extinction spectra contained both scattering and absorption components. In order to obtain an absorption spectrum of the condensed phase H_2O associated with the particulates, it was necessary to subtract from the extinction spectra the absorption by H_2O vapor and the scattering by the particulates. H_2O vapor subtraction was accomplished by a standard technique. A procedure using Mie theory to subtract the scattering component of the extinction spectrum is described. The absorption spectra were used to determine the water content and structure of the particulates. Above approx 50% RH the aerosols contain aqueous droplets that have not reached equilibrium with the water vapor during the timescale of the experiments (approx 10 s). There is sharp transition in water content at around 50% RH which is consistent with other measures of the recrystallization point. Below 50% RH the NaCl particles contain an anomalously large amount of H_2O. Several different particle models are considered to explain the H_2O content. The model in which the NaCl particles contain pockets of aqueous NaCl solution was found to be most consistent with the spectroscopic observations. The relevance of salt particle morphology and water content to atmospheric aerosol chemistry is discussed.
机译：在实验室中，通过在环境条件下雾化NaCl水溶液，生成中值直径约为0.4＃μm的氯化钠液滴。获得了在受控相对湿度（RH）为15％到95％范围内的气溶胶的红外消光光谱。消光光谱同时包含散射和吸收成分。为了获得与颗粒结合的冷凝相H_2O的吸收光谱，必须从消光光谱中减去H_2O蒸气的吸收和颗粒的散射。通过标准技术完成H_2O蒸气减影。描述了使用米氏理论减去消光光谱的散射分量的过程。吸收光谱用于确定颗粒的水含量和结构。相对湿度高于约50％时，气溶胶中包含的水滴在实验时间范围内（约10 s）未与水蒸气达到平衡。在相对湿度为50％左右时，水分含量会急剧变化，这与重结晶点的其他度量一致。相对湿度低于50％时，NaCl颗粒含有异常大量的H_2O。考虑使用几种不同的粒子模型来解释H_2O含量。发现其中NaCl颗粒包含NaCl水溶液囊的模型与光谱观察最一致。讨论了盐颗粒形态和含水量与大气气溶胶化学的关系。

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