Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-7-13001-2007
http://www.atmos-chem-phys-discuss.net/7/13001/2007/
http://www.atmos-chem-phys-discuss.net/7/13001/2007/acpd-7-13001-2007.html
http://www.atmos-chem-phys-discuss.net/7/13001/2007/acpd-7-13001-2007.pdf
13001
13033
2007-09-06
The measurement of aerosol optical properties at a rural site in Northern China
P. Yan
yanpeng@cams.cma.gov.cn
J. Tang
J. Huang
J. T. Mao
X. J. Zhou
Q. Liu
Z. F. Wang
H. G. Zhou
Chinese Academy of Meteorological Sciences of CMA, Beijing, China
Atmospheric Department, Peking University, Beijing, China
Guangzhou tropical meteorological institute of CMA, Guangzhou, China
Beijing meteorological Bureau, Beijing, China
Atmospheric aerosols contribute one of the largest sources of uncertainty in
the estimation of climate forcing. During the period from April 2003 to
January 2005, in situ measurements of aerosol optical properties were
conducted at a rural site in Northern China, Shangdianzi Global Atmosphere
Watch (GAW) regional station (SDZ). Based on the daily average data, the
means (standard deviation, S.D.) of scattering and absorption coefficients
for the entire period were 174.6 Mm<sup>−1</sup> (189.1 Mm<sup>−1</sup>) and 17.5 Mm<sup>−1</sup> (13.4 Mm<sup>−1</sup>),
respectively. These values were approximately
one third of the reported values for scattering coefficients and one fifth
of those for absorption coefficients obtained in the Beijing urban area. The
mean single scattering albedo (SSA) for the entire period was 0.88 (0.05),
which was about 0.07 higher than the values reported for the Beijing urban
area, and also higher than the values (0.85) used in the climate model
simulation for China and India. Both the absorption and scattering
coefficients showed the lowest values in winter (11.2 Mm<sup>−1</sup> and 128.9 Mm<sup>−1</sup>, respectively), while the highest values appeared in summer for
absorption coefficients (22.1 Mm<sup>−1</sup>) and in fall for scattering
coefficients (208.2 Mm<sup>−1</sup>). The mean SSA were lowest in spring (0.85)
and highest in winter (0.90). The daily variations of aerosol absorption and
scattering coefficients were strongly influenced by synoptic changes
throughout the observation period. A trajectory cluster analysis was applied
to discern the source characteristics of aerosol optical properties for
different air masses. The cluster mean scattering coefficients, absorption
coefficients and SSA were all high when the air masses moved from SW and
SE-E directions to the site and aerosols were influenced with heavy
pollution from the dense population centers and industrial areas. The
cluster mean SSA for air masses coming from the polluted areas was not only
higher than those with the trajectories from the "clean" directions, but
also higher than the reported values for the regions with high pollution
emissions (such as Beijing urban area). This fact might reflect the
substantial secondary aerosol production during the transport. The
characteristics of aerosol optical properties measured at this rural site
suggest the significant impacts of human activities on the regional aerosol.
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