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| Titel |
MAX-DOAS measurements of tropospheric vertical profiles of aerosols, NO2, SO2 and HCHO in the suburban area of Xintai city, China: comparisons with aircraft and ground-based measurements, and investigation of transport |
| VerfasserIn |
Yang Wang, Steffen Dörner, Thomas Wagner, Yuying Wang, Hao He, Xinrong Ren, Zhanqing Li, Donghui Li, Hua Xu, Zhengqiang Li, Jiwei Xu, Dong Liu, Zhenzhu Wang, Isabelle De Smedt, Nicolas Theys |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250142078
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| Publikation (Nr.) |
 EGU/EGU2017-5653.pdf |
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| Zusammenfassung |
| Xingtai is one of the most polluted cities in China and is located on the western edge of the
large industrial zone of the North China plain. The Taihang Mountains in the west of Xingtai
block transport of polluted air mass towards western China and cause accumulation of
pollutants along the mountains. Severely polluted air harms health of about seven million
inhabitants in Xingtai. Air pollution also affects condensation nuclei for the formation of
convective clouds, and thus potentially initiates heavy rainfall. In order to study the
interaction of pollutants and clouds, the Atmosphere-Aerosol-Boundary Layer-Cloud
(A2BC) Interaction Joint Experiment was held around Xingtai in the period from May to
June 2016. Various instruments measuring gaseous pollutants, aerosols, clouds,
precipitation, and radiance are operated at a monitoring station (37.18∘ N, 114.36∘ E) in the
suburban area of Xintai city and aboard two aircrafts which fly up and down in
spirals between 0.2 km and 4 km over the station. We operated a Multi Axis (MAX-)
Differential Optical Absorption Spectroscopy (DOAS) instrument at the station in order
to derive tropospheric vertical profiles of aerosols, NO2, SO2 and HCHO during
daytime with a time resolution of about 10 minutes. We apply our profile inversion
algorithm PriAM based on the optimal estimation theory to retrieve trace gas and
aerosol profiles. The results are compared with other ground-based and aircraft
measurements. In general reasonable consistency was found, but the comparison
also revealed a considerable smoothing effect of the MAX-DOAS retrievals. The
MAX-DOAS results are applied to characterize the vertical profiles and the diurnal
cycles of the trace gas and aerosol pollutants. Lifted layers of pollutants, especially
aerosols and SO2, were frequently observed during the campaign indicating frequent
transport events of pollutants over the station. Rapid cleaning events of pollutants were
also observed. We further investigate the effect of transport and the distribution of
emission sources (e.g. the wind dependence of pollutants) using MAX-DOAS results
in combination with satellite observations, and the HYSPLIT trajectory model. |
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