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首页> 外文期刊>Environmental Science & Technology >Derivation Of The Density And Refractive Index Of Organic Matter And Elemental Carbon From Closure Between Physical And Chemical Aerosol Properties
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Derivation Of The Density And Refractive Index Of Organic Matter And Elemental Carbon From Closure Between Physical And Chemical Aerosol Properties

机译：由物理和化学气溶胶性质之间的封闭得出有机物和元素碳的密度和折射率

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摘要

Information on the density (p) and refractive index m (=n -ik) of elemental carbon (EC_a) and organic matter (0M_a), the main carbon components of atmospheric aerosols, has frequently been obtained from closure calculations between physical and chemical aerosol properties. However, this approach has suffered from large uncertainties since there were more unknown (or poorly known) parameters than defining equations. In this study, we propose a method that avoids this ambiguity mainly by considering both optical and mass closure and by expressing the three EC_a parameters (ρ_(ECa), η_(ECa), Κ_(ECa)) by a single (unknown) parameter. This allows mathematically rigorous determination of ρ_(ECa), η_(ECa), ρ_(OMa) and m_(OMa) from standard physico-chemical aerosol data and rigorous error analysis. The results are unambiguous and self-consistent i.e., there is no difference between the chemically and physically derived ρ and m values of the atmospheric aerosol. Application of this method to our previously published data on biomass burning particles from Amazonia yields ρ_(ECa) = 1.8(±0.2) g/cm~3, m_(ECa) = 1.9(±0.1)-i0.20(-0.04/+0.02), ρ_(0Ma) = 1.39(±0.13)g/cm~3 and m_(0Ma) = 1.46(±0.02), where the 1σ uncertainty limits given in parenthesis are based on the principles of error propagation. The relatively low imaginary part of m_(ECa) indicates the presence of only partially graphitized elemental carbon, which is consistent with biomass burning aerosol dominated by smoldering combustion conditions.
机译：关于元素碳（EC_a）和有机物（0M_a）（大气气溶胶的主要碳组分）的密度（p）和折射率m（= n -ik）的信息通常是通过物理和化学气溶胶之间的闭合计算得出的属性。但是，由于存在比定义方程式更多的未知（或鲜为人知）参数，因此该方法存在很大的不确定性。在这项研究中，我们提出了一种避免这种歧义的方法，主要是通过同时考虑光学和质量闭合，并通过一个（未知）参数来表达三个EC_a参数（ρ_（ECa），η_（ECa），Κ_（ECa））。 。这允许根据标准的理化气溶胶数据和严格的误差分析在数学上严格确定ρ_（ECa），η_（ECa），ρ_（OMa）和m_（OMa）。结果是明确和自洽的，即，化学和物理方法得出的大气气溶胶的ρ和m值之间没有差异。该方法在我们先前发布的亚马逊河流域生物质燃烧颗粒数据中的应用ρ_（ECa）= 1.8（±0.2）g / cm〜3，m_（ECa）= 1.9（±0.1）-i0.20（-0.04 / +0.02），ρ_（0Ma）= 1.39（±0.13）g / cm〜3和m_（0Ma）= 1.46（±0.02），其中括号中给出的1σ不确定性限制基于误差传播的原理。 m_（ECa）的相对较低的假想部分表明仅存在部分石墨化的元素碳，这与阴燃条件下占主导的生物质燃烧气溶胶一致。

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