Particle hygroscopicity inhomogeneity and its impact on reactive uptake.
Particle hygroscopicity inhomogeneity and its impact on reactive uptake.
复制标题
颗粒吸湿性不均匀性及其对反应吸收的影响
DOI：
10.1016/j.scitotenv.2021.151364
复制
发表时间：
2021
影响因子：
9.8
通讯作者：
Hu Min
中科院分区：
文献类型：
--
作者：
Zong Taomou;Wang Haichao;Wu Zhijun;Lu Keding;Wang Yu;Zhu Yishu;Shang Dongjie;Fang Xin;Huang Xiaofeng;He Lingyan;Ma Nan;GroSS Johannes;Huang Shan;Guo Song;Zeng Limin;Herrmann Hartmut;Wiedensohler Alfred;Zhang Yuanhang;Hu Min
大气颗粒物是多相化学的重要反应容器。通过对以往在不同环境（包括海洋、城市和农村地区）中的实地观测数据进行荟萃分析，发现颗粒物吸湿性不均匀性（PHI）在大陆大气颗粒物中普遍存在，其中相当一部分颗粒物是疏水性的（平均10%~ 33%）。然而，在量化反应性气体的吸收过程中的PHI的效果仍然不清楚。在这里，以N2 O 5吸收为例，我们表明，使用基于实验室的参数化方案，而不考虑的PHI可能会导致错误估计的吸收速率系数，特别是在低环境相对湿度（RH）。这种错误估计可能是由吸收系数的差异以及亲水性和疏水性颗粒之间的表面积浓度（SA）的比例引起的。我们建议，在建立反应性痕量气体非均相吸收参数化时，应充分考虑PHI。
Atmospheric particles are important reaction vessels for multiphase chemistry. We conducted a meta-analysis of previous field observations in various environments (includes ocean, urban and rural regions), showing that particle hygroscopicity inhomogeneity (PHI) is ubiquitous for the continental atmospheric particles, in which a considerable part of the particulate matters is hydrophobic (10%–33% on average). However, the effects of PHI in quantifying the uptake process of reactive gases are still unclear. Here, taking N2O5uptake as an example, we showed that using a laboratory-based parameterization scheme without considering the PHI might result in a misestimation of uptake rate coefficient, especially under low ambient relative humidity (RH). Such misestimation may be caused by the differences of the uptake coefficients, as well as the proportion of surface area concentration (SA) between hydrophilic and hydrophobic particles. We suggested that the PHI should be well-considered in establishing the reactive traces gases heterogeneous uptake parameterizations.