A Study of the Relationship between Air Pollutants and Inversion in the ABL over the City of Lanzhou |
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Authors: | ZHANG Qiang and LI Hongyu |
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Institution: | Gansu Key Laboratory of Arid Climatic Change and Reducing Disaster, Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA,Institute of Arid Meteorology, Chinese Meteorological Administration, Lanzhou 730020, Gansu Provincial Meteorological Bureau, Lanzhou 730020, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000,College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, Gansu Key Laboratory of Arid Climatic Change and Reducing Disaster, Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA, Institute of Arid Meteorology, Chinese Meteorological Administration, Lanzhou 730020 |
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Abstract: | By analyzing the pollutant concentrations over the urban
area and over the rural area of the city of Lanzhou, Gansu Province, China,
the relationships between the daytime inversion intensity and the pollutant
concentration in the atmospheric boundary layer (ABL) are studied with the
consideration of wind speed and direction, potential temperature, specific
humidity profiles, pollutant concentration in the ABL, the surface
temperature, and global radiation on the ground. It was shown that the
daytime inversion is a key factor in controlling air pollution
concentration. A clear and positive feedback process between the daytime
inversion intensity and the air pollutants over the city was found through
the analysis of influences of climatic and environmental factors. The
mechanisms by which the terrain and air pollutants affect the formation of
the daytime inversion are discussed. The solar radiation as the essential
energy source to maintain the inversion is analyzed, as are various
out-forcing factors affecting the inversion and air pollutants. At last, a
physical frame of relationships of air pollution with daytime inversion and
the local and out-forcing factors over Lanzhou is built. |
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Keywords: | relationship Lanzhou City inversion pollutant out-forcing factors |
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