Research On The Main Temporal And Spatial Distribution Characteristics Of Aircraft Turbulence In China

At present,the spatial and temporal distribution characteristics and weather background of the aircraft turbulence in China is still not clear,which makes the existed turbulence forecast production reference value has limited in the actual operation.Based on the PRIPREs data,according to the different height,time,region and weather causes of aircraft turbulence,this paper analyzes the spatial and temporal distribution characteristics of aircraft turbulence in China.On the basis of this study,the Wenzhou area,one of the high turbulence and high incidence areas,was selected as the research object.The main weather contribution of the aircraft to turbulence in this area was analyzed,and the theoretical basis for the prevention and recognition of the aircraft turbulence was provided.The details are as follows.By the relationship of distribution of the turbulence and route,the winter and summer in the northeast of Tibetan areas in China the number of occurrence of turbulence is very few,in the north,especially in the spring of the beijing-tianjin region,aircraft turbulence reports have many times,which is frequently south of the cold air in the north of the spring,and the high pressure should be moved to the low pressure.It is very likely that there will be some connection between the weather situation and should avoid to allocate large load in the spring of flights.In the recent five years of aircraft turbulence in China,the number of aircraft turbulence has been increasing year by year.The number of moderate turbulence is the most frequently,and a large proportion of the aircraft turbulence occur in the two quarters of spring and winter.The jet and wind shear is the main weather scenes that cause the turbulence of the aircraft and the main height of the aircraft turbulence.The altitude layer is concentrated in the range of 8000 to 10000 meters in the main cruising range.The distribution features of the plane turbulence in the region are more dense in the North China and East China,and in the northwest and the northeast are relatively small.In the southern part of China,the aircraft turbulence more concentrated in winter,in the northern part of our country,aircraft Turbulence is more concentrated in spring.Wenzhou area is a high turbulence area.The height of turbulence is mainly concentrated in the space range of about 5000 to 6000 meters,the intensity of turbulence is stronger.The main time period of turbulence is concentrated in winter and spring season.Through the analysis of the meridional wind,zonal wind,temperature gradient and vertical motion in the region of turbulence,it is found that the probability of turbulence is greatest when the aircraft is in the strong up-down airflow area,especially in the moving area of the airflow,and when the horizontal and vertical shear of the zonal wind is larger in the horizontal direction,it is also easy to cause turbulences.