Journal Article

PreJuSER-17035

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Measurements of gaseous H2SO4 by AP-ID-CIMS during CAREBeijing 2008 Campaign

Zheng, J. ; Hu, M. ; Zhang, R. ; Yue, D. ; Wang, Z. ; Guo, S. ; Li, X.FZJ* ; Bohn, B.FZJ* ; Shao, M. ; He, L. ; Huang, X. ; Wiedensohler, A. ; Zhu, T.

2011
EGU Katlenburg-Lindau

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Please use a persistent id in citations: http://hdl.handle.net/2128/9962  doi:10.5194/acp-11-7755-2011

Abstract: As part of the 2008 Campaign of Air Quality Research in Beijing and Surrounding Regions (CAREBeijing 2008), measurements of gaseous sulfuric acid (H2SO4) have been conducted at an urban site in Beijing, China from 7 July to 25 September 2008 using atmospheric pressure ion drift - chemical ionization mass spectrometry (AP-ID-CIMS). This represents the first gaseous H2SO4 measurements in China. Diurnal profile of sulfuric acid is strongly dependent on the actinic flux, reaching a daily maximum around noontime and with an hourly average concentration of 5 x 10(6) molecules cm(-3). Simulation of sulfuric acid on the basis of the measured sulfur dioxide concentration, photolysis rates of ozone and nitrogen dioxide, and aerosol surface areas captures the trend of the measured H2SO4 diurnal variation within the uncertainties, indicating that photochemical production and condensation onto preexisting particle surface dominate the observed diurnal H2SO4 profile. The frequency of the peak H2SO4 concentration exceeding 5 x 10(6) molecules cm(-3) increases by 16% during the period of the summer Olympic Games (8-24 August 2008), because of the implementation of air quality control regulations. Using a multivariate statistical method, the critical nucleus during nucleation events is inferred, containing two H2SO4 molecules (R-2 = 0.85). The calculated condensation rate of H2SO4 can only account for 10-25 % of PM1 sulfate formation, indicating that either much stronger sulfate production exists at the SO2 source region or other sulfate production mechanisms are responsible for the sulfate production.

Keyword(s): J

Note: This work was part of the Campaign of Atmospheric Research in Beijing and surrounding areas supported by Beijing Environment Protection Bureau (OITC-G08026056) and the National Natural Science Foundation of China (20977001, 21025728). This work was also supported by the Robert A. Welch Foundation (Grant A-1417). R. Z. acknowledged further support from the National Natural Science Foundation of China Grant (40728006).

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Contributing Institute(s):

1. Troposphäre (IEK-8)

Research Program(s):

1. Atmosphäre und Klima (P23)

Appears in the scientific report 2011

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