Toward a general parameterization of N2O5 reactivity on aqueous particles: the competing effects of particle liquid water, nitrate and chloride
Toward a general parameterization of N2O5 reactivity on aqueous particles: the competing effects of particle liquid water, nitrate and chloride
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DOI：
10.5194/acp-9-8351-2009
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发表时间：
2009-01-01
影响因子：
6.3
通讯作者：
Thornton, J. A.
中科院分区：
文献类型：
--
作者：
Bertram, T. H.;Thornton, J. A.
利用自制的化学电离质谱仪耦合的气溶胶流动管研究了N2O5在有机-无机混合气溶胶颗粒上的非均相反应。对水颗粒的实验室结果证实，对于低于15M的颗粒水浓度以及颗粒水与硝酸盐的摩尔比，反应吸收系数(伽马)强烈依赖于颗粒液态水。对氯化物-硝酸盐混合颗粒物上的伽马(N2O5)的测量表明，微量氯化物的存在会抵消高硝酸盐负荷时对伽马(N2O5)的抑制作用，这对受污染的沿海地区是有影响的。这些结果被用来构建一个新的伽马(N2O5)参数化，当它与气溶胶热力学模式相结合时，可以在区域和/或全球化学输送模式中使用。
The heterogeneous reaction of N2O5 on mixed organic-inorganic aerosol particles was investigated using an entrained aerosol flow tube coupled to a custom-built chemical ionization mass spectrometer. Laboratory results on aqueous particles confirm a strong dependence of the reactive uptake coefficient (gamma) on particle liquid water, for particle water concentrations below 15 M, and the molar ratio of particle water to nitrate. Measurements of gamma(N2O5) on mixed chloride-nitrate particles indicate that the presence of trace chloride can negate the suppression of gamma(N2O5) at high nitrate loadings with implications for polluted coastal regions. These results are used to construct a new parameterization for gamma(N2O5), that when coupled to an aerosol thermodynamics model, can be used within regional and/or global chemical transport models.