Heterogeneous Uptake onto Deliquesced Particles as an Atmospheric Fate of Isoprene-Derived Hydroxy-RO2

Yosuke Sakamoto*, Rikudai Mikami, Jiaru Li, Nanase Kohno, Yu Morino, Kei Sato and Yoshizumi Kajii, 
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Abstract

We integrated a chemical conversion technique to transform RO2 into OH radicals with a method combining laser photolysis radical generation and time-resolved OH radical detection by laser-induced fluorescence (LP-LIF). This approach allowed us to investigate the uptake coefficient of an isoprene-derived hydroxy–RO2, ISOPOO (HOC5H8OO·), onto deliquesced NaCl particles and the effect of transition metal ions (Fe2+ and Cu2+) on this uptake. We measured the uptake coefficients, γ, of ISOPOO on deliquesced NaCl particles doped with FeCl2 and CuCl2, each added at 5 wt % of NaCl, at 301 K and 84% relative humidity (RH). The results were 0.45 ± 0.01 for FeCl2 and 0.19 ± 0.01 for CuCl2. These values were 5 and 2 times greater than the uptake coefficient for deliquesced undoped NaCl particles, which was 0.09 ± 0.01. Preliminary simulation results for the western Japan domain, using a value of γ = 0.09 from a three-dimensional chemical transport model, indicate that the heterogeneous uptake of ISOPOO onto deliquesced particles contributed, on average, less than 3% of the ISOPOO loss process. This contribution increased to as much as 5% in remote forest and mountain areas during high PM2.5 events.

Abstract Image

异戊二烯衍生羟基- ro2在溶解颗粒上的非均匀吸收
采用激光光解自由基生成与激光诱导荧光(LP-LIF)时间分辨OH自由基检测相结合的方法,将RO2转化为OH自由基。这种方法使我们能够研究异戊二烯衍生的羟基- ro2, ISOPOO (HOC5H8OO·)对脱水NaCl颗粒的吸收系数以及过渡金属离子(Fe2+和Cu2+)对这种吸收的影响。我们测量了在5wt % NaCl浓度、301 K和84%相对湿度(RH)条件下,掺FeCl2和CuCl2的溶解液NaCl颗粒上ISOPOO的吸收系数γ。FeCl2为0.45±0.01,CuCl2为0.19±0.01。这些值分别是未掺杂NaCl颗粒吸水系数(0.09±0.01)的5和2倍。在日本西部海域,使用三维化学输运模型的γ = 0.09的初步模拟结果表明,溶胀颗粒对ISOPOO的非均匀吸收平均贡献不到ISOPOO损失过程的3%。在高PM2.5事件期间,这一贡献在偏远的森林和山区增加到高达5%。
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