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| Titel |
Observation and modelling of the OH, HO2 and RO2 radicals at a rural site (Wangdu) in the North China Plain in summer 2014 |
| VerfasserIn |
Zhaofeng Tan, Hendrik Fuchs, Keding Lu, Birger Bohn, Sebastian Broch, Rolf Haeseler, Andreas Hofzumahaus, Frank Holland, Xin Li, Ying Liu, Franz Rohrer, Min Shao, Baolin Wang, Ming Wang, Yusheng Wu, Limin Zeng, Andrease Wahner, Yuanhang Zhang |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250125815
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| Publikation (Nr.) |
 EGU/EGU2016-5459.pdf |
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| Zusammenfassung |
| A comprehensive field campaign was carried out in summer 2014 in Wangdu located in the
North China Plain. A month of continuous OH, HO2and RO2 measurements were obtained
by a laser induced fluorescence system. High daytime OH, HO2 and RO2 radical
concentrations were observed of which their daily maximum concentrations were (5 -
15)×106cm−3, (3 - 14)×108 cm−3 and (3 - 15)×108 cm−3, respectively. A chemical box
model constrained by observed trace gas compounds with state of art chemical mechanism is
used to interpret the observed radical concentrations. The model underestimated the observed
OH concentrations by a factor of 2 when NO is less than 100ppt in the afternoon hours. Like
PRIDE-PRD2006 and CAREBEIJING2006, an additional OH recycling is required to
reproduce the observed OH concentrations for the high VOC and low NOx conditions.
Based on a few chemical modulation experiments we performed at the site, the
determined OH interference signal were very small for the afternoon conditions. In
addition, we found that observed RO2 concentrations were underestimated in the
morning hours which indicated the existence of additional chemical sources of
RO2 and an underestimation of the local ozone production rates in current model. |
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