Heterogeneous loss of HO2 by KCl, synthetic sea salt, and natural seawater aerosol particles
Heterogeneous loss of HO2 by KCl, synthetic sea salt, and natural seawater aerosol particles
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DOI：
10.1016/j.atmosenv.2008.12.010
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发表时间：
2009-03
影响因子：
5
通讯作者：
F. Taketani;Y. Kanaya;H. Akimoto
中科院分区：
文献类型：
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作者：
F. Taketani;Y. Kanaya;H. Akimoto
气溶胶颗粒对ho2的吸收是海洋大气中ho2自由基的潜在重要吸收。为了评估ho2在海洋气溶胶颗粒上的异质性损失，我们利用气溶胶流管（AFT）和化学转化/激光诱导荧光（CC/LIF）技术，研究了环境条件（760 Torr和296±2 K）下，亚微米气溶胶颗粒对KCl、合成海盐和天然海水的ho2吸收系数（γ）。在66%和75%的相对湿度下，KCl的干气溶胶和湿气溶胶的γ值分别为0.02±0.01和0.07±0.03，而在75%的相对湿度下，掺杂cuso4的气溶胶的γ值为0.55±0.19。在35%、50%、75% RH条件下，合成海盐颗粒的γ值分别为0.07±0.03、0.12±0.04和0.13±0.04；在35%、50%、75% RH条件下，天然海水颗粒的γ值分别为0.10±0.03、0.11±0.02和0.10±0.03。我们建议将海洋地区的ho2吸收系数设为0.1，并使用箱形模式估计海盐气溶胶颗粒对海洋地区ho2非均质损失的贡献。我们的箱形模型模拟表明，白天最大ho2浓度下降到87-94%，没有非均质损失。
The HO2uptake to aerosol particles is potentially significant sink for the HO2radical in the marine atmosphere. To assess the heterogeneous loss of HO2on marine aerosol particles, we have investigated the uptake coefficients (γ) of HO2for submicron aerosol particles of KCl, synthetic sea salt, and natural seawater under ambient conditions (760 Torr and 296 ± 2 K) using an aerosol flow tube (AFT) coupled with a chemical conversion/laser-induced fluorescence (CC/LIF) technique. γ values determined for dry and wet aerosols of KCl were 0.02 ± 0.01 and 0.07 ± 0.03 at 66% and 75% RH, respectively, while γ values for those doped with CuSO4was 0.55 ± 0.19 at 75% RH. γ values determined for synthetic sea-salt particles were 0.07 ± 0.03, 0.12 ± 0.04 and 0.13 ± 0.04 at 35%, 50%, 75% RH, respectively, while γ values for natural seawater particles were 0.10 ± 0.03, 0.11 ± 0.02 and 0.10 ± 0.03 at 35%, 50%, 75% RH, respectively. We recommend a HO2uptake coefficient in marine areas of 0.1 for modeling and estimated the contribution of heterogeneous loss of HO2by sea-salt aerosol particles in marine areas using a box model. Our box-model simulations suggested that daytime maximum HO2concentrations decreased to 87–94% of the values without heterogeneous loss.