Share Email Print

Proceedings Paper

Formaldehyde integral content in troposphere of Moscow region: preliminary results of 6 years of measurements using DOAS technique
Author(s): O. V. Postylyakov; A. N. Borovski; V. A. Ivanov; A. V. Dzhola; E. I. Grechko; Y. Kanaya
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

Formaldehyde (HCHO) in the atmosphere is directly emitted by anthropogenic and biogenic sources and, more significantly, produced during oxidation of methane and other volatile organic compounds (VOCs), and so its content is one of observable indicators of air pollution by VOCs. HCHO has a sufficiently large absorption cross-section in the UV spectral region to be detected by the technique of the differential optical absorption spectroscopy (DOAS). Spectral measurements of scattered solar radiation are performed at Zvenigorod Scientific Station (ZSS, 55°41'49'"N, 36°46'29'"E) located in 38 km west from Moscow Ring Road by MAXDOAS instrument since 2008. This location of the observational station allows evaluating the background levels of formaldehyde in the troposphere and the levels that are associated with pollution from Moscow. For analysis of the HCHO variability we selected spectra taken in cloud free conditions from October 2009 to April 2016. Version 1.3 of the retrieval algorithm is used. It uses information on the surface albedo and the height of the atmospheric boundary layer inferred from a model. It has optimized interpolation parameter of DOAS processing. Cloud screening algorithm using UV color index (the ratio of 370-nm radiance to 340-nm one) was implemented. The obtained data quantify the Moscow megapolis influence on air quality at Zvenigorod by comparison of HCHO VCD for east and west wind directions. HCHO VCD at East winds in average more than one at West winds for 0.4 ± 0.1×1016mol×cm-2 at air temperatures from +5 to +35°C, and for 0.8 ± 0.2×1016 mol×cm-2 at temperatures from -20 to +5°C. It may be caused by Moscow emissions of HCHO precursors. Strong dependence of HCHO VCD on air temperature is noticeable in our data for air temperatures from +5 to +35°C. In different wind conditions the gradient of the temperature effect is about 0.86 ± 0.07 ×1015 mol×cm-2×°C-1 in average. The increase of the formaldehyde content with the increase of the air temperature can be caused by the HCHO formation from non-methane biogenic volatile organic compounds for which more emission is expected at higher temperatures.

Paper Details

Date Published: 29 November 2016
PDF: 8 pages
Proc. SPIE 10035, 22nd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 100353A (29 November 2016); doi: 10.1117/12.2248630
Show Author Affiliations
O. V. Postylyakov, A.M. Obukhov Institute of Atmospheric Physics (Russian Federation)
A. N. Borovski, A.M. Obukhov Institute of Atmospheric Physics (Russian Federation)
V. A. Ivanov, V. E. Zuev Institute of Atmospheric Optics (Russian Federation)
A. V. Dzhola, A.M. Obukhov Institute of Atmospheric Physics (Russian Federation)
E. I. Grechko, A.M. Obukhov Institute of Atmospheric Physics (Russian Federation)
Y. Kanaya, Japan Agency for Marine-Earth Science and Technology (Japan)

Published in SPIE Proceedings Vol. 10035:
22nd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics
Gennadii G. Matvienko; Oleg A. Romanovskii, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?