Hydrogen peroxide (H₂O₂) acts as a terminal sink for atmospheric HO_x radicals (OH and HO₂), playing a key role in tropospheric O₃ formation. However, there are few field measurements of atmospheric H₂O₂ to assess its role in O₃ formation, especially for the seriously polluted region of the North China Plain. In this study, H₂O₂ concentrations were measured at the foot of Mt. Tai from May to July 2018 and the summit of Mt. Tai from May to June 2019, with average values of 0.93 ± 1.01 and 2.05 ± 1.20 ppb, respectively. H₂O₂ exhibited a pronounced diurnal variation with a noon-peak at the foot of Mt. Tai, which could be well reproduced by a gas-phase box model with H₂O₂ dry deposition velocity of 3 cm s⁻¹ included, indicating H₂O₂ was mainly photochemically produced. Modeling analysis showed H₂O₂ production at the foot was most sensitive to alkenes and aromatics, while the source and sink for H₂O₂ were dominated by HO₂ recombination and dry deposition, respectively. Compared with the summer-measurement in 2007, the remarkable elevation of H₂O₂ at the summit might be ascribed to volatile organic compounds (VOCs) increase and SO₂ decline. Both H₂O₂-O₃ correlation and H₂O₂/NO_z ratio suggested O₃ formation at the foot of Mt. Tai was mainly VOC-sensitive in the early morning and shifted to NO_x-sensitive thereafter. Therefore, reduction of VOCs emission especially for the reactive species of alkenes and aromatics in the morning as well as NO_x emission around noontime will be effective for mitigating the serious O₃ (as well as H₂O₂) pollution in Tai'an city.

中文翻译：

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山脚和山顶的大气过氧化氢 (H2O2)。Tai：变化、来源和汇，以及臭氧形成化学的影响

过氧化氢 (H ₂ O ₂ ) 作为大气中 HO _x自由基（OH 和 HO ₂）的终端汇，在对流层 O _{3 的}形成中起关键作用。然而，很少有大气H ₂ O _{2 的}现场测量来评估其在O ₃形成中的作用，特别是对于华北平原污染严重的地区。在这项研究中，测量了山脚下的H ₂ O ₂浓度。2018 年 5 月至 7 月的泰和山的顶峰。Tai 2019 年 5 月至 6 月，平均值分别为 0.93±1.01 和 2.05±1.20 ppb。H ₂ O ₂表现出明显的昼夜变化，在山脚下有一个中午高峰。Tai 可以很好地被包含H ₂ O ₂干沉积速度为3 cm s ^-1的气相箱模型再现，表明H ₂ O ₂主要是光化学产生的。建模分析表明，脚下产生的H ₂ O ₂对烯烃和芳烃最敏感，而 H ₂ O ₂的源和汇分别以 HO ₂复合和干沉积为主。与 2007 年夏季实测相比，H ₂ O ₂显着升高可能归因于挥发性有机化合物 (VOCs) 增加和 SO ₂下降。H ₂ O ₂ -O ₃相关性和H ₂ O ₂ /NO _z比均表明在山脚下形成了O ₃。Tai 主要在清晨对 VOC 敏感，此后转变为对 NO _x敏感。因此，减少挥发性有机化合物排放的特别适用于烯烃和芳族化合物的在上午反应性物质以及NO _X周围中午发射将是减轻严重ø有效₃（以及以H ₂ ö ₂) 泰安市污染。