Microphysical characteristics of precipitation within convective overshooting over East China observed by GPM DPR and ERA5

Sun, Nan; Lu, Gaopeng; Fu, Yunfei

We examine geographical distribution pattern of convective overshooting and its internal microphysical three-dimensional structure of precipitation over East China by matching Global Precipitation Measurement Dual-frequency Precipitation Radar instrument (GPM DPR) with European Centre for Medium-Range Weather Forecasts 5th Reanalysis (ERA5). Convective overshooting events mainly occur over NC (Northeast China) and northern MEC (Middle and East China), with a magnitude of only 10 −3; Radar reflectivity of convective overshooting over NC accounts for a higher proportion below the zero level, while MEC and SC (South China) account for a higher proportion above the zero level, indicating stronger upward motion and more ice crystal particles; The microphysical processes within convective overshooting are unique, leading to various properties of the droplets in precipitation. Droplets of convective overshooting are large, but sparse. And its effective radius of droplet, below 10 km altitude, is almost exceeding 2.5 mm, which is about twice than normal precipitation. Convective overshooting humidifies air below the cloud top and obviously increases the ozone near tropopause as a result of influx of ozone from lower troposphere and sinking of air with high concentration ozone in the stratosphere. Findings of this study may have important implications for the microphysical evolution associated with convective overshooting, and provide more accurate precipitation microphysical parameters as the input of the model simulation.

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Sun, Nan / Lu, Gaopeng / Fu, Yunfei: Microphysical characteristics of precipitation within convective overshooting over East China observed by GPM DPR and ERA5. 2023. Copernicus Publications.

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