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| Titel |
Simultaneous measurements of HONO and NO2 at a rural site in Northern China by IBBCEAS |
| VerfasserIn |
Min Qin, Jun Duan, Wu Fang, Renzi Hu, Xue Lu, Lanlan Shen, Ang Li, Pinhua Xie, 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 |
250125762
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| Publikation (Nr.) |
 EGU/EGU2016-5396.pdf |
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| Zusammenfassung |
| HONO arose the interests for its photolysis is an important source of OH radical.
However, its source, especially the daytime source is still unclear. With high primary
pollutants and aerosol concentrations, the characteristics of air pollutions in China can
be expected to be sometimes quite different from the one observed in developed
countries. HONO shows high level not only in urban areas but also in rural areas in
China.
The temporal behavior of HONO and NO2 was investigated at a rural site in Wangdu,
Hebei Province, China, by using incoherent broadband cavity-enhanced absorption
spectroscopy (IBBCEAS) during the CAREBEIJING-NCP Campaign from June 26th to July
9th 2014. The concentrations of HONO and NO2 measured by IBBCEAS were
compared with a LOPAP (Long Path Absorption Photometer) instrument and a
commercial NOx analyzer (Thermo 42i), and the results showed the well correlations for
the correlation coefficient (R2) of HONO and NO2 were up to 0.878 and 0.989,
respectively. During the measurements, the daytime rapid variations of HONO
were found. The peak values of HONO at around noon even unexpected exceed
3ppb and the unknown daytime HONO source strength (PM) reached up to 14
ppb/h, while the concentrations of NO2 were very low (< 5ppb) and the peaks of
HONO/NO2 even exceed 100%, which were different from the previous field observations.
The possible formations were discussed in this paper, the so high value of daytime
HONO could not be explained by the known direct emissions or reactions related
to NO2 and might come from soils much possible or the other unknown sources. |
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