The Analysis Of The Anomaly-based Signal On Severe Haze Episodes

Anyang as one of the heavily polluted cities in Henan Province,especially heavy pollution weather occurs frequently in winter.At present,the diagnosis of heavy pollution in Anyang Henan Province.At present,the diagnosis of heavy pollution in Anyang City Henan Province weather analysis are rare,heavy pollution weather is a kind of weak weather phenomenon.In this passage,using ERA-Interim reanalysis data and air quality monitoring data,weather analysis are rare.Based on the anomalous analysis method proposed by Professor Qian Weihong,the atmospheric variables can be decomposed into climate field and anomalous field,the anomalous field signal of heavy pollution weather can amplify the meteorological signal of heavy pollution weather.The main meteorological factors affecting the heavy pollution weather include temperature,geopotential height,humidity and wind field.The following conclusions can be drawn by studying the variation rules of the anomalous field structure of these meteorological variables in the process of heavy pollution:（1）Heavy pollution weather is a direct response to the vertical anomalous field structure in the middle and lower troposphere.When the atmosphere is in a static state,when there is a positive temperature anomaly near 700-850 h Pa,a positive potential anomaly in the upper troposphere and a negative anomaly near the ground.（2）The specific anomaly and humidity-wind anomaly are also two additional conditions that can indicate the heavy pollution.When heavy pollution occurs,there is a positive humidity anomaly in the middle and lower troposphere in Anyang,forming a humidity field structure with upper dry and lower wet.As well as near the ground,southerly wind anomaly and the existence of downward anomaly vertical wind in the middle and lower troposphere are all meteorological anomaly conditions that are conducive to the accumulation of atmospheric pollution.（3）According to the meteorological elements in the process of heavy pollution When Anyang is in the static stability stage,there are positive t temperature anomaly and humidity anomaly in the middle and lower troposphere;when Anyang is in the stage of pollution dissipation,there is a negative temperature anomaly in the middle and lower troposphere in Anyang,as well as a negative specific humidity anomaly near the ground.（4）In the static stability weather of heavy pollution,analyzing the vertical structure anomaly near 700 h Pa,850 h Pa and 1000 h Pa in the middle and lower troposphere,it is found that the anomaly structure has a better indication of the middle and lower troposphere.However,compared with the weather with weak precipitation,the indication effect is better in the non-rainy weather.（5）In the preliminary forecast test of Anyang,the anomalous method has an accuracy rate of about 77%.Due to the unique geographical characteristics and climatic background of Anyang,as well as the difference in emission sources between Anyang and Beijing,the analysis shows that there is a 4-12h delay time between the anomalous temperature and the anomalous height potentiality with the PM_2.5concentration.