Analysis of Atmospheric Boundary Layer Inversion Characteristics Based on Microwave Radiometer Observations in Ji'nan in 2015
Based on the German RPG ground-based microwave radiometer observations,firstly the sounding and microwave radiometer data were compared,and the deviation and the root mean square error of two kinds of data were calculated in order to test the reliability of the ground-based microwave radiometer data,then combined the conventional meteorological observations,the atmospheric boundary layer inversion feature in 2015 in Ji'nan was analyzed.The results are as follows:(1)The precipitation process had certain influence on the microwave radiometer observations,and there was a good consistency between the sounding and microwave radiometer data under no rainfall condition.(2)The monthly average frequency of ground inversion layer occurring in Ji'nan was 84.9 %,and it was 100% in February,September,October and December.Due to unstable atmosphere stratification and stronger convection in summer,the ground inversion was weaker and the frequency was only 46.6%.(3)The frequency of overhang inversion was smaller in 2015 in Ji'nan,and it was maximum in April with the value of 30% only.(4)The ground inversion layer thickness distributed unevenly with an obvious peak value of 900 meters in 2015.It was easily observed that ground inversion temperature difference climbed higher and its intensity reached a maximum value of level 6 in spring,and it dropped down in summer with a minimum intensity value of level 1,in the rest two seasons the ground inversion intensity reached level 3.(5)The overhang inversion layer had a top height of 2 000 meters in winter when its temperature difference reached 8.0 ℃,and a relatively small value of 0.5 ℃ in summer when its intensity was as low as level 2.
NETL
NSTL
万方数据
维普
