ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Phased array radar characteristics of minute scale extreme precipitation over Zhejiang in summer
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Abstract:
In order to explore the detection ability of phased array radar for extreme precipitation, based on the basic products of X-band phased array radar and three-dimensional wind field reversal from June to August in 2023 and 2024, the dual-polarization parameter characteristics of 9 extreme precipitation events in two summer years and the storm structure of 3 typical extreme precipitation processes were studied by statistical and diagnostic analysis methods. The results show that: The mean and median values of horizontal?polarization?radar reflectivity(ZH), differential reflectivity (ZDR) and differential?propagation?phase?shift (KDP) below 4 km gradually increase with the increase of minute precipitation level. KDP increases the most obviously. The KDP of super heavy precipitation > 2.5 mm·min-1 increased by 30%~246% compared with the lowest level of 1~1.5 mm·min-1 at each height, and increased by 15%~167% compared with the KDP of the lower level of 2~2.5 mm·min-1 . ZH and KDP decrease with increasing altitude, and the maximum values are in 0~1 km. The dual-polarization parameters of the lower layer gradually increase 3 to 10 min before the extreme minute precipitation, and decrease 2 to 5 min after the extreme value, with the maximum fluctuation range of KDP. Under 2 km, the increase of KDP before the extreme value is 133~205%, and the decrease after the extreme value is 49~55%. The intensity of the precipitation depends mainly on the KDP (particle concentration). By analyzing the characteristics of extreme precipitation storm, we can see that the storm belongs to backward propagation type, with a new cell every 4 to 6 min born on the west side and the whole life history ≥65 min. There is a convergence zone of 4~5 km thick in the storm. The ZDR maximum center of the storm are below 3 km, and larger raindrops are concentrated in the lower layer. The possible reason of the increase of KDP laging behind the increase of ZDR is that during the descent, raindrops first grow in size and then break up into smaller high-concentration raindrops.
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