Atmospheric Chemistry and Physics
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2007
10.5194/acp-7-423-2007
http://www.atmos-chem-phys.net/7/423/2007/
http://www.atmos-chem-phys.net/7/423/2007/acp-7-423-2007.html
http://www.atmos-chem-phys.net/7/423/2007/acp-7-423-2007.pdf
423
434
2007-01-24
Long-range transport of Asian dust and air pollutants to Taiwan: observed evidence and model simulation
C.-Y. Lin
yao435@rcec.sinica.edu.tw
Z. Wang
W.-N. Chen
S.-Y. Chang
C. C. K. Chou
N. Sugimoto
X. Zhao
Research Center for Environmental Changes, Academia Sinica, Taipei 115, Taiwan
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
National Institute for Environmental Studies, Onogawa, Tsukuba, Japan
Long-range transport of Asian dust and air pollutants are major
environmental concerns of Taiwan during the winter monsoon season when
northeasterly winds prevail following passages of cold fronts. Based on
hourly measurements of Taiwan Environmental Protection Administration (TEPA)
air quality monitoring stations, Lidar and in-situ IC, a significant
long-range transport dust and air pollutants event on 18 March 2005 has been
identified. During this episode, drastically elevated concentrations of
PM<sub>10</sub>, CO and SO<sub>2</sub> along with the strong northeasterly on 18 March
were observed over background Wanli station, with peaks of about 170 μgm<sup>−3</sup>,
1.0 ppm and 14 ppb, respectively. We have found that air masses
of air pollutants and Asian dust are transported separately. Although the
mixing takes place on the way to Taiwan, it mixes slightly when they arrived
in Taiwan. The major component of the first PM<sub>10</sub> peak were air
pollutants, evidenced by the consistent peaks of SO<sub>4</sub><sup>2−</sup> and
NO<sub>3</sub><sup−</sup> measured by in-situ IC, while no significant depolarization
was measured by Lidar. In contrast, the evident non-spherical particles and
hourly PM<sub>10</sub> concentration consistently varied with Ca<sup>2+</sup> indicating
that mineral dust was the major component of the second peak. Trajectory
analysis showed that these two peaks come from quite different sources
areas. The air masses of the first peak mainly come from anthropogenic area
and transport in the low boundary layer (<1500 m) while the masses of the
second peak originate from high altitude (>4000 m) of desert areas.
Numerical results showed significant agreement of temporal and vertical
variation of aerosol concentration with observations. The phenomena of split
air parcels between air pollutants and Asian dust transported to Taiwan are
strongly associated with the transport paths and stable and dry atmospheric
boundary conditions.
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