ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 47 Issue 11 > 2021,47(11):1402-1415. DOI:10.7519/j.issn.1000-0526.2021.11.009 Prev Next
Radar Echo Characteristics of Short-Time Severe Precipitation in Xinjiang
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Abstract:
Using the data of 8 Doppler weather radars in Xinjiang, this paper statistically analyzes the main radar echo parameters of 229 short-time severe precipitations without hail in the warm season from 2010 to 2018 in the effective detection range, and compares the results with those in central and eastern parts of China. The results show that the convective storms affecting Xinjiang’s short-time severe precipitation mainly include three types: merged-enhanced, train-effect, and locally developing. The merged-enhanced type is the most (45%), and the train-effect type is the least (20%). Because of the topography of the Tianshan Mountains, it mainly occurs on the northern slope of the Tianshan Mountains. Besides, the main echo parameter thresholds of various types of radars in various regions are summarized. In general, the short-time severe precipitation threshold in southern Xinjiang is smaller than that in northern Xinjiang, the largest in the Ili Valley, and the smallest in the Aksu area. The short-time severe precipitation in the Ili Valley is dominated by low-centroid echo. The maximum echo intensity of the short-time rainstorm is more than 50 dBz in northern Xinjiang and northern Bazhou, more than 45 dBz and 40 dBz in the western part of southern Xinjiang and Aksu Region, respectively. In most 〖JP2〗cases, strong convergence can be found on the radial velocity chart, but the western part of southern Xinjiang and the northern slope of Tianshan Mountain have more strong convergence due to the influence of special topography. Short-time severe precipitation caused by supercells occurs relatively frequently in Aksu Region, not often seen in other regions. In Xinjiang, the probability of short-time severe precipitation accompanied by hail is small. The maximum echo intensity threshold of short-time severe precipitation and rainstorm in Xinjiang is generally higher than that in central and eastern China.
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