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| Titel |
Observation of NO3 radicals by LP-DOAS during CAREBEIJING 2014 |
| VerfasserIn |
Xue Lu, Min Qin, Pinhua Xie, Jun Duan, Wu Fang, Jianguo Liu, Wenqing Liu |
| 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 |
250126510
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| Publikation (Nr.) |
 EGU/EGU2016-6242.pdf |
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| Zusammenfassung |
| NO3 radical is a significant species during night, affecting the formation of secondary organic aerosol (SOA) in night. It is also the most pivotal oxidation in night, involved in the removal process of NOx and VOCs, which is directly related to atmosphere cleanliness. During the CAREBEIJING field campaign (June 5 - July 10, 2014), NO3 radical was measured with a long path differential optical absorption spectroscopy (LP-DOAS) at Wangdu Site (38.68°N; 115.18°E) in the north of China. In this poster, the principle and fitting analyses of LPDOAS were presented; a retrieval example and a time series of NO3 radicals’ concentration with good continuity were showed. The detection limit (1σ) of NO3 with 3.4km optical path is 3.4ppt. The observed mean NO3 mixing ratios were 21 ppt. Under the assumption of steady state, the NO3 production rates were calculated averaging at 1.013ppb/h. The calculated NO3 lifetime has an average of 102.6 s. The correlation between the NO3 mixing ratio and its production rates is about 0.78, which indicates the importance of direct sinks. However, the slope of the logarithmic correlation between NO3 lifetime and NO2 mixing ratio is -0.44, revealing the removal of NO3 is not strongly dependent on the indirect loss process herein. |
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