摘要：重点研究以台湾地区高屏空品区的大寮、美浓、及左营测站为研究标地,以ISORROPIA热力学平衡模式仿真,假设气溶胶形态为稳定状态或亚稳定状态,且有无包含地壳元素,比较仿真结果与实际测量值之间的差异,以了解气溶胶形态为稳定或亚稳定状态下,气溶胶的变化反应。模式效能评估结果显示,在亚稳定状态及有包含地壳元素条件下,其仿真效果最好,且此条件也是较接近实际的环境状态。通过以大寮、美浓及左营测站为标地,以亚稳定状态及有包含地壳元素条件进行讨论,结果显示,在不同季节及不同地区,影响PM_2.5浓度的最主要前驱污染物皆不同。此外,PM_2.5临界值的结果显示,其前驱污染物对PM_2.5浓度变化影响呈现非线性反应及非正比的关系。

关键词：热力学平衡；前驱气体；大气悬浮颗粒

Abstract：Based on the ambient aerosol data obtained from southern Tai-wan,the response of inorganic aerosols to changes in precursor concentrations was calculated with applying the inorganic aerosol model ISOR- ROPIA. Comparing the predictions of ISORROPIA with the observations, the predicted and measured NH₄⁺,NH₃ and NO₃^-generally presented good correlation at study sites when the aerosols were assumed to be in the stable or metastable. Contrarily,the predicted and measured HNO₃ presented poor correlation. The estimated response of inorganic PM_2.5 to changes in precursor concentrations was affected by the inclusion of crustal species in some cases,although average responses were comparable with and without crustal species. When the aerosols were assumed to be in the metastable, the lowest bias and error were achieved for the modeling. The results showed that when the aerosols were assumed to be in the metastable and the crustal species were included, the simulation effect was the most,and the modeling conditions actually approached to the environmental conditions. Changes in sulfate and nitrate are expected to lead to proportional reductions in inorganic fine particulate matter. However,calculation of marginal PM2.5 in this study showed the response of ambient aerosols to changes in precursor concentrations presented a non-linear response.

Keywords：thermodynamic equilibrium; precursor; airborne particles