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| Titel |
Distribution of trace gases and aerosols in the Siberian air shed during wildfires of summer 2012 |
| VerfasserIn |
Boris D. Belan, Jean-Daniel Paris, Philippe Nédélec, Pavel N. Antokhin, Victoriya Arshinova, Mikhail Yu. Arshinov, Sergey B. Belan, Denis K. Davydov, Georgii A. Ivlev, Alexandre V. Fofonov, Artem V. Kozlov, Tatyana M. Rasskazchikova, Denis E. Savkin, Denis V. Simonenkov, Tatyana K. Sklyadneva, Gennadii N. Tolmachev |
| 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 |
250147192
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| Publikation (Nr.) |
 EGU/EGU2017-11316.pdf |
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| Zusammenfassung |
| During the last two decades, three strong biomass burning events have been observed in
Russia: two of them in 2002 and 2010 in the European part of Russia, and another one in
2012 in West and East Siberia. In this paper we present results of the extensive airborne study
of the vertical distribution of trace gases and aerosols carried out during strong wildfire event
happened in summer 2012 in Siberia. For this purpose, the Optik TU-134 aircraft
laboratory was used as a research platform. A large-scale airborne campaign has
been undertaken along the route Novosibirsk–Mirny–Yakutsk–Bratsk–Novosibirsk
on 31st of July and 1st of August, 2012. Flight pattern consisted of a number of
ascents and descents between close to the ground and 8 km altitude that enabled
20 vertical profiles to be obtained. Campaign was conducted under the weather
conditions of low-gradient baric field that determined the low speed transport of air
masses, as well as the accumulation of biomass burning emissions in the region under
study.
Highest concentrations of CO2, CH4 and CO over wildfire spots reached 432 ppm,
2367 ppb, and 4036 ppb, correspondingly. If we exclude from the analysis the data
obtained when crossing smoke plumes, we can find a difference between background
concentrations measured in the atmosphere over regions affected by biomass burning and
clean areas. Enhancement of CO2 over the wildfire areas changed with altitude. On
average, it was 10.5 ppm in the atmospheric boundary layer (ABL) and 5-6 ppm in
the free troposphere. Maximum CO2 enhancements reached 27 ppm and 24 ppm,
correspondingly. The averaged CH4 enhancement varied from 75 ppb in the boundary layer
to 30 ppb in the upper troposphere, and a little bit lower than 30 ppb in the middle
troposphere. Maximum CH4 enhancements reached 202 ppb, 108 ppb, and 50-60 ppb,
correspondingly. The averaged and maximum enhancements of CO differed by an
order of magnitude. Thus, in the ABL the maximum difference in concentration
between clean and wildfire areas reached 2300 ppb, while averaged one was 170
ppb. In the middle troposphere maximum enhancements varied from 1000 to 1700
ppb.
The vertical distribution of ozone has its own peculiarities. Ozone concentration
decreased in the layers with enhanced aerosol concentration and it increased in the areas with
lower aerosol content. At the same time, photochemical production ozone was observed at the
plume edges in the zone of fresh air entrainment.
This work was supported by the Russian Foundation for Basic Research (grant No
17-05-00374). |
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