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| Titel |
Measurements of tropospheric NO2 column at a rural site southwest of Beijing using Mini-MAX-DOAS instruments |
| VerfasserIn |
Junli Jin, Jianzhong Ma, Reza Shaiganfar, Thomas Wagner |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250090401
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| Publikation (Nr.) |
 EGU/EGU2014-4636.pdf |
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| Zusammenfassung |
| Tropospheric vertical column density (VCD) of NO2 retrieved from satellite observations has been widely used in atmospheric chemistry research in China. An underestimation of tropospheric NO2 has been found for satellite with respect to passive DOAS ground measurement in megacities, e.g., Beijing and Shanghai. Therefore, MAX-DOAS ground measurements in the non-urban sites are specially needed to validate the satellite data for a wide area in China.
The Gucheng site (39 deg 08 min N, 115 deg 40 min E, 15.2 m asl) is located in the polluted rural area of North China, with a distant about 110km southwest of Beijing, 130 km west of Tianjin, and 160 km northeast of Shijiazhuang. We performed ground-based MAX-DOAS measurements in Gucheng from 1 September 2008 through 30 September 2010. The two year’s DOAS spectra data are analyzed with a focus on tropospheric NO2 at the first stage. Here we present the results of the retrieved tropospheric NO2 VCDs at this site, including the diurnal, weekly and seasonal variations and cloud effects.
We find a prominent seasonal variation pattern of tropospheric NO2 VCD over Guocheng, with a monthly mean minimum occurring during summertime and a monthly mean maximum in wintertime. We also find two peaks in the tropospheric NO2 VCD diurnal variations in spring, autumn and winter, occurring around 8:00 BJT and 17:00 BJT respectively. These retrieved results will be used to validate satellite products of tropospheric NO2 VCDs. |
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