This title appears in the Scientific Report :
2010
Please use the identifier:
http://hdl.handle.net/2128/20450 in citations.
Please use the identifier: http://dx.doi.org/10.1029/2009JD012714 in citations.
Oxidant (O3 + NO2) production processes and formation regimes in Beijing
Oxidant (O3 + NO2) production processes and formation regimes in Beijing
For CareBeijing-2006, two sites were established in urban and suburban regions of Beijing in summer 2006. Observations of O-3 and its precursors together with meteorological parameters at both sites are presented. Gross ozone production rate P(O-3) and sensitivity to nitric oxides (NOx) and volatile...
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Personal Name(s): | Lu, K. |
---|---|
Zhang, Y. / Su, H. / Brauers, T. / Chou, C.C. / Hofzumahaus, A. / Liu, S.C. / Kita, K. / Kondo, Y. / Shao, M. / Wahner, A. / Wang, J. / Wang, X. / Zhu, T. | |
Contributing Institute: |
Troposphäre; ICG-2 |
Published in: | Journal of Geophysical Research Journal of geophysical research / Atmospheres, 115 (2010) S. 1 - 18 |
Imprint: |
Washington, DC
Union
2010
|
Physical Description: |
1 - 18 |
DOI: |
10.1029/2009JD012714 |
Document Type: |
Journal Article |
Research Program: |
Atmosphäre und Klima |
Series Title: |
Journal of Geophysical Research D: Atmospheres
115 |
Subject (ZB): | |
Link: |
Get full text OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1029/2009JD012714 in citations.
For CareBeijing-2006, two sites were established in urban and suburban regions of Beijing in summer 2006. Observations of O-3 and its precursors together with meteorological parameters at both sites are presented. Gross ozone production rate P(O-3) and sensitivity to nitric oxides (NOx) and volatile organic compounds (VOCs) were investigated using an observation-based photochemical box model (OBM). P(O-3) varied from nearly zero to 120 and 50 ppb h(-1) for urban and suburban sites, respectively. These rates were greater than the accumulation rates of the observed oxidant (O-3 + NO2) concentrations. The O-3 episodes typically appeared under southerly wind conditions with high P(O-3), especially at the urban site. Sensitivity studies with and without measured nitrous acid (HONO) as a model constraint suggested that the estimated P(O-3) at both sites was strongly enhanced by radical production from HONO photolysis. Both NOx- and VOC-sensitive chemistries existed over time scales from hours to days at the two sites. The variation in O-3-sensitive chemistry was relatively well explained by the ratio of the average daytime total VOC reactivity (k(TVOC)) to NO, with the transition chemistry corresponding to a k(TVOC)/NO value of 2-4 s(-1) ppb(-1). Pronounced diurnal variations in the O-3 production regime were found. In the morning, conditions were always strongly VOC-limited, while in the afternoon, conditions were variable for different days and different sites. The model-calculated results were tested by measurements of H2O2, HNO3, total OH reactivity, and HOx radicals. The OBM was generally capable of correctly simulating the levels of P(O-3), although it might tend to overpredict the VOC-sensitive chemistry. |