Atmospheric OH reactivities in the Pearl River Delta - China in summer 2006: measurement and model results

被引：190

作者：

Lou, S. ^{[1
,2
]}

Holland, F. ^{[1
]}

Rohrer, F. ^{[1
]}

Lu, K. ^{[1
,3
]}

Bohn, B. ^{[1
]}

Brauers, T. ^{[1
]}

Chang, C. C. ^{[6
]}

Fuchs, H. ^{[1
]}

Haeseler, R. ^{[1
]}

Kita, K. ^{[4
]}

Kondo, Y. ^{[5
]}

Li, X. ^{[1
,3
]}

Shao, M. ^{[3
]}

Zeng, L. ^{[3
]}

Wahner, A. ^{[1
]}

Zhang, Y. ^{[3
]}

Wang, W. ^{[2
]}

Hofzumahaus, A. ^{[1
]}

机构：

[1] Forschungszentrum Julich, Inst Energie & Klimaforsch Troposphare, D-52425 Julich, Germany

[2] Shanghai Jiao Tong Univ, Sch Environm Sci & Technol, Shanghai 200030, Peoples R China

[3] Peking Univ, Coll Environm Sci & Engn, Beijing 100871, Peoples R China

[4] Ibaraki Univ, Fac Sci, Ibaraki, Japan

[5] Univ Tokyo, Adv Sci & Technol Res Ctr, Tokyo, Japan

[6] Acad Sinica, RCEC, Taipei 115, Taiwan

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2010年 / 10卷 / 22期

关键词：

NEW-YORK-CITY; VOLATILE ORGANIC-COMPOUNDS; LASER-INDUCED PUMP; URBAN ATMOSPHERE; AIR-POLLUTION; METROPOLITAN-AREA; OZONE PRODUCTION; PROBE TECHNIQUE; SOUTHERN CHINA; TRACE GASES;

D O I：

10.5194/acp-10-11243-2010

中图分类号：

X [环境科学、安全科学];

学科分类号：

083001 [环境科学];

摘要：

Total atmospheric OH reactivities (k(OH)) have been measured as reciprocal OH lifetimes by a newly developed instrument at a rural site in the densely populated Pearl River Delta (PRD) in Southern China in summer 2006. The deployed technique, LP-LIF, uses laser flash photolysis (LP) for artificial OH generation and laser-induced fluorescence (LIF) to measure the time-dependent OH decay in samples of ambient air. The reactivities observed at PRD covered a range from 10 s(-1) to 120 s(-1), indicating a large load of chemical reactants. On average, k(OH) exhibited a pronounced diurnal profile with a mean maximum value of 50 s(-1) at daybreak and a mean minimum value of 20 s(-1) at noon. The comparison of reactivities calculated from measured trace gases with measured k(OH) reveals a missing reactivity of about a factor of 2 at day and night. The reactivity explained by measured trace gases was dominated by anthropogenic pollutants (e. g., CO, NOx, light alkenes and aromatic hydrocarbons) at night, while it was strongly influenced by local, biogenic emissions of isoprene during the day. Box model calculations initialized by measured parameters reproduce the observed OH reactivity well and suggest that the missing reactivity is contributed by unmeasured, secondary chemistry products (mainly aldehydes and ketones) that were photochemically formed by hydrocarbon oxidation. Overall, k(OH) was dominated by organic compounds, which had a maximum contribution of 85% in the afternoon. The paper demonstrates the usefulness of direct reactivity measurements, emphasizes the need for direct measurements of oxygenated organic compounds in atmospheric chemistry studies, and discusses uncertainties of the modelling of OVOC reactivities.

引用

页码：11243 / 11260

页数：18

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