Based on the data of airborne Ka-band precipitation cloud radar(KPR)and droplet measurement technologies(DMT)obtained during a weak precipitation process of stratiform cloud system on 17 November 2019,the radar reflectivity(Zc)calculated with the detected cloud particle spectrum is compared with the KPR observation(Zm),and the causes of the deviation are discussed.The results are as follows.(1)Inside the stratiform cloud,Zc and Zm are in good agreement with a deviation and root mean square error of 4.1 dBZ and 4.3 dBZ,respectively.(2)The deviation and root mean square error between Zc and Zm are larger in areas with larger variation of KPR's radial velocity and velocity spectrum width,or in thin cloud area,but there is a good consistency in the variation trend of radar reflectivity.(3)The variation of cloud particle number concentration(Nc),cloud particle effective diameter and cloud liquid water content all have certain influence on the deviation between Zc and Zm,but the deviation is generally controlled within the range of±10 dBZ.With the increase of Nc,the deviation between the two becomes smaller;when Nc is greater than 200 cm-3,the deviation greater than 10 dBZ is rare.Zc is smaller than Zm when the effective diameter is between 50 and 230 μm and the liquid water content is between 0.15 and 0.50 g·m-3;Zc is greater than Zm when the effective diameter is greater than 230 μm and the liquid water content is greater than 0.50 g·m-3.
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