Measurement report: Important contributions of oxygenated compounds to emissions and chemistry of volatile organic compounds in urban air

被引：88

作者：

Wu, Caihong ^{[1
,2
]}

Wang, Chaomin ^{[1
,2
]}

Wang, Sihang ^{[1
,2
]}

Wang, Wenjie ^{[3
]}

Yuan, Bin ^{[1
,2
]}

Qi, Jipeng ^{[1
,2
]}

Wang, Baolin ^{[5
]}

Wang, Hongli ^{[6
]}

Wang, Chen ^{[5
]}

Song, Wei ^{[4
]}

Wang, Xinming ^{[4
]}

Hu, Weiwei ^{[4
]}

Lou, Shengrong ^{[6
]}

Ye, Chenshuo ^{[3
]}

Peng, Yuwen ^{[1
,2
]}

Wang, Zelong ^{[1
,2
]}

Huangfu, Yibo ^{[1
,2
]}

Xie, Yan ^{[7
]}

Zhu, Manni ^{[7
]}

Zheng, Junyu ^{[1
,2
]}

Wang, Xuemei ^{[1
,2
]}

Jiang, Bin ^{[1
,2
]}

Zhang, Zhanyi ^{[1
,2
]}

Shao, Min ^{[1
,2
]}

机构：

[1] Jinan Univ, Inst Environm & Climate Res, Guangzhou 511443, Peoples R China

[2] Guangdong Hong Kong Macau Joint Lab Collaborat In, Guangzhou 511443, Peoples R China

[3] Peking Univ, Coll Environm Sci & Engn, State Joint Key Lab Environm Simulat & Pollut Con, Beijing 100871, Peoples R China

[4] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China

[5] Qilu Univ Technol, Sch Environm Sci & Engn, Jinan 250353, Peoples R China

[6] Shanghai Acad Environm Sci, State Environm Protect Key Lab Format & Prevent U, Shanghai 200233, Peoples R China

[7] South China Univ Technol, Coll Environm & Energy, Guangzhou 510006, Peoples R China

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2020年 / 20卷 / 23期

基金：

中国国家自然科学基金;

关键词：

TOTAL OH REACTIVITY; PEARL RIVER DELTA; BIOMASS BURNING EMISSIONS; GAS-PHASE REACTIONS; TOF-MS MEASUREMENTS; PTR-TOF; ATMOSPHERIC CHEMISTRY; PHOTOCHEMICAL DATA; VOC EMISSIONS; TRACE GASES;

D O I：

10.5194/acp-20-14769-2020

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Volatile organic compounds (VOCs) play important roles in the tropospheric atmosphere. In this study, VOCs were measured at an urban site in Guangzhou, one of the megacities in the Pearl River Delta (PRD), using a gas chromatograph-mass spectrometer/flame ionization detection (GC-MS/FID) and a proton transfer reaction time-of-flight mass spectrometer (PTR-ToF-MS). Diurnal profile analyses show that stronger chemical removal by OH radicals for more reactive hydrocarbons occurs during the daytime, which is used to estimate the daytime average OH radical concentration. In comparison, diurnal profiles of oxygenated volatile organic compounds (OVOCs) indicate evidence of contributions from secondary formation. Detailed source analyses of OVOCs, using a photochemical age-based parameterization method, suggest important contributions from both primary emissions and secondary formation for measured OVOCs. During the campaign, around 1700 ions were detected in PTR-ToF-MS mass spectra, among which there were 462 ions with noticeable concentrations. VOC signals from these ions are quantified based on the sensitivities of available VOC species. OVOC-related ions dominated PTR-ToF-MS mass spectra, with an average contribution of 73 % +/- 9 %. Combining measurements from PTRToF-MS and GC-MS/FID, OVOCs contribute 57 % +/- 10 % to the total concentration of VOCs. Using concurrent measurements of OH reactivity, OVOCs measured by PTR-ToF-MS contribute greatly to the OH reactivity (19 % +/- 10 %). In comparison, hydrocarbons account for 21 % +/- 11 % of OH reactivity. Adding up the contributions from inorganic gases (48 % +/- 15 %), similar to 11 % (range of 0 %-19 %) of the OH reactivity remains 'missing", which is well within the combined uncertainties between the measured and calculated OH reactivity. Our results demonstrate the important roles of OVOCs in the emission and evolution budget of VOCs in the urban atmosphere.

引用

页码：14769 / 14785

页数：17

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