Abstract
This paper defined regional pollution day and regional heavy pollution day, calculated the atmospheric stability by Pasqual classification and the height of mixed layer by national standard method, established a conceptual model of meteorological conditions in Guanzhong Urban Agglomeration. The results show that：(1) The more possibility of the regional pollution and regional heavy pollution is, the lower the mixing layer height is. (2)The frequency of stability increased with degree of pollution, the frequency of regional heavy pollution stability reached nearly 60% as regional heavy pollution. (3)In heavily polluted area, the frequency of ground temperature inversion is nearly 90%, the average cumulative temperature inversion thickness is 260m at assurance rate of 80%, and the maximum temperature inversion strength is 10.8℃/100m. (4) Regional pollution is easy to occur when the frequency of quiet wind is higher than 50%. At the same time, it is easy to form wind convergence area in the hinterland of Guanzhong Area, which causes the accumulation of pollutants.
Highlights
1.1 Research Area Guanzhong Plain is adjacent to Qinling Mountains in the south, Weibei tableland in the north, Baoji Gorge in the West and Tongguan in the East, with a length of about 300 kilometers and an altitude of about 323-800 meters
Meteorological conditions play a key role in the transport, diffusion, secondary transformation of air pollutants and even the occurrence of heavy pollution events [9], meteorological conditions that cause heavy air pollution events can be regarded as a meteorological condition which is extremely harmful to the removal of pollutants
This paper used the environmental pollution monitoring data and meteorological data of the same period in Guanzhong region, defined the weather process of regional heavy pollution and regional pollution, analyzed the main characteristics of meteorological elements in the process of regional pollution with different intensities, established the conceptual model of weather and meteorological conditions of different degrees of pollution in Guanzhong area, the conclusion is as follows: (1) From 2014 to 2018, the average annual pollution days in Guanzhong region is 145.4d, the number of pollution days and heavy pollution days has an obvious increasing trend, and the pollution days at all levels are more in autumn and winter than in summer
Summary
1.1 Research Area Guanzhong Plain is adjacent to Qinling Mountains in the south, Weibei tableland in the north, Baoji Gorge in the West and Tongguan in the East, with a length of about 300 kilometers and an altitude of about 323-800 meters. Guanzhong urban agglomeration is the most densely populated area in Shaanxi Province, an important birthplace of Chinese civilization, the starting point of the ancient Silk Road, the only high-tech industrial development belt and spark technology industrial belt in the western region of China, and has a unique strategic position in the overall situation of national modernization construction and all-round opening pattern
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