Page 260 - 《高原气象》2023年第1期

高 原 气 象 42 卷
256

Analysis of Pollution Characteristics and Potential Sources
of Atmospheric Particulate Matter in Qingdao

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ZHANG Yujie ， FENG Junjie ， ZHANG Wu ， TU Aiqin ， LI Hengchang 1， 2
（1. Key Laboratory for Meteorological Disaster Prevention and Mitigation of Shandong， Jinan 250031， Shandong， China；
2. Ensuring Center of Atmospheric Sounding Technology， Shandong Meteorological Bureau， Jinan 250031， Shandong， China；
3. Shandong Meteorological Observatory， Jinan 250031， Shandong， China；
4. Key Laboratory for Semi-Arid Climate Change of the Ministry of Education， College of Atmospheric Sciences
of Lanzhou University， Lanzhou 730000， Gansu， China）

Abstract： Based on the atmospheric particulate matter mass concentration of Shandong Qingdao from January
2017 to December 2020， the conventional meteorological observation data and GDAS data， the pollution charac‐
teristics of atmospheric particulate matter in this area are studied， and the transmission path of atmospheric particu‐
late matter in Qingdao are analyzed based on HYSPLIT model and TrajStat software. the potential source area and
concentration contribution are studied by the Potential Source Contribution Function （PSCF） and Concentration
Weighted Trajectory （CWT）. The research findings show： （1） The average annual value of PM mass concentra‐
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tion in Qingdao was 35. 3 µg·m . The mass concentration was the highest in winter， followed by spring and au‐
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tumn， and the lowest in summer. The annual exceeding standard rates of PM mass concentration were 8. 22%，
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7. 40%， 11. 51% and 7. 38% respectively. The heavy pollution days only occurred in winter and the pollution
days never occurred in summer.（2） The seasonal and diurnal variation of PM mass concentration presents a
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"double peak and double Valley" type. The peak value appears at 08:00 （Beijing Time， the same as after） -10:00
and 21:00 -22:00， and the valley value appears at 16:00 -18:00 and 02:00 -04:00. The seasonal diurnal variation
of SO mass concentration shows a "single peak" type. The daytime concentration is higher than that at night， and
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the diurnal variation curve fluctuates more obviously in heating season. The diurnal variation of NO shows a
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"double peak and double Valley" type， and the peak time is slightly earlier than that of the diurnal variation of
PM .（3） The PM mass concentration is negatively correlated with air temperature， daily precipitation， wind
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speed and initial height of inversion， and the correlation coefficients are -0. 422， -0. 212， -0. 106 （wind speed≤
2. 5 m·s ） and -0. 15 respectively； It is positively correlated with air pressure and inversion intensity， and the cor‐
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relation coefficients are 0. 319 and 0. 10 respectively. There is an unobvious correlation between PM mass con‐
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centration and the thickness of atmospheric inversion layer， and the correlation between PM mass concentration
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and relative humidity is not unique.（4） The air flow trajectory in spring， autumn and winter comes from the
northwest and northerly directions. The northwest air flow accounts for the highest proportion， and they are
70. 27%、 75. 39% and 100% respectively. The PM mass concentration in the pollution trajectory is the highest，
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which is the most important transport path of foreign atmospheric particles in spring， autumn and winter in Qingdao.
The southeast air flow trajectory accounts for the largest proportion in summer， accounting for 45. 89%. The PM
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mass concentration in the pollution track is the highest， which is the main transport path of foreign atmospheric
particles in Qingdao in summer. The potential source area of PM mass concentration has the widest distribution
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range in winter， the highest WPSCF value， the second in spring and autumn， and the smallest in summer. The
main potential pollution source areas and high concentration contribution potential source areas in spring， autumn
and winter are located in the south of Hebei， the Middle East of Henan， the west of Anhui， the west of Shanxi and
the southwest of Shandong. They are the main source areas for the external transportation of PM pollution in
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spring， autumn and winter in Qingdao. The potential source areas of high concentration contribution in summer
are located in the southeast of Hebei， the northeast of Henan and the southwest of Shandong and so on.
Key words： PM ； mass concentration； potential sources； PSCF； CWT
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