Assessments of urban aerosol pollution in Moscow and its radiative effectsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Simultaneous measurements by the collocated
AERONET CIMEL sun/sky photometers at the Moscow
State University Meteorological Observatory (MSU MO)
and at the Zvenigorod Scientific Station (ZSS) of the
A. M. Obukhov Institute of Atmospheric Physics during
September 2006–April 2009 provide the estimates of the effects
of urban pollution on various aerosol properties in different
seasons. The average difference in aerosol optical
thickness between MO MSU and ZSS, which can characterize
the effect of aerosol pollution, has been estimated to
be about dAOT = 0.02 in visible spectral region. The most
pronounced difference is observed in winter conditions when
relative AOT difference can reach 26%. The high correlation
of the AOT’s, the Angstrom exponent values and the effective
radii between the sites confirms that natural processes are
the dominating factor in the changes of the aerosol properties
even over the Moscow megacity area. The existence of positive
correlation between dAOT and difference in water vapor
content explains many cases with large dAOT between the
sites by the time lag in the airmass advection. However, after
excluding the difference due to this factor, AOT in Moscow
remains higher even in a larger number of cases (more than
75%) with the same mean dAOT = 0.02. Due to the negative
average difference in aerosol radiative forcing at the TOA
of about dARFTOA =−0.9Wm−2, the aerosol urban pollution
provides a distinct cooling effect of the atmosphere. The
PAR and UV irradiance reaching the ground is only 2–3%
lower in Moscow due to the pollution effects, though in some
situations the attenuation can reach 13% in visible and more
than 20% in UV spectral region.